INSULATED WINDING WIRE ARTICLES HAVING CONFORMAL COATINGS

INSULATED WINDING WIRE ARTICLES HAVING CONFORMAL COATINGS

CROSS-REFERENCE TO RELATED APPLICATION

|©0ei} This application claims priority to U.S. Provisional Application No. 62/315,874, filed March 31 , 201 and entitled: "Insulated Winding Wire With a Conformal Coating," the contents of -which is incorporated by reference herein in its entirety.

TECHNICAL FIELD

[0002] Embodiments of the disclosure relate generally to articles formed from insulated winding wire and, more particularly, to winding wire articles that include at least one conformal coating layers.

BACKGROUND

[0003] Magnetic winding wire, also referred to as magnet wire, is used in a multitude- of devices that require the development of electrical and/or magnetic fields to perform electromechanical work. Examples of such devices include electric motors, generators, transformers, actuator coils, etc. Typically, magnet wire is constructed by applying electrical insulation to a metallic conductor,, such as a copper, aluminum, or alloy conductor. The electrical insulation is typically formed as a coating that provides for electrical integrity and prevents shorts in the magnet wire. Conventional insulations include polymeric enamel films, extruded thermoplastic layers, polymeric tapes, and certain combinations thereof.

|0004) The insulation system of a magnet wire can be damaged by a wide variety of different types of events during manufacture, transport, an&'or subsequent processing. As wire size increases, wires may increase in stiffness and be more susceptible to damage during manufacture and/or processing. Even minor damage to the insulation, such as a pinhole in one or more insulation layers, may result in a fault site that reduces electrical performance. Partial discharge can occur at a localized fault site and typically begins within voids,, cracks, or inclusions within a solid dielectric; however, it can also occur along surfaces of an insulation material. Once begun, partial discharge progressively deteriorates insulation and ultimately leads to electrical breakdown.

[00O5f In certain applications, magnet wire may be cut into sections, and each section may be worked or formed into a desirable shape for insertion into an assembly, such as an electric motor, starter-generator, etc. For example, sections of magnet wire may be formed into hairpins that are incorporated into a motor assembly. When cut, the underlying conductor is exposed, thereby subjecting the wire to an increased risk of fault sites developing. Shaping, twisting, and/or o$ter manipulation of the wire may also result in the generation of fault sites. The risk of fault site formation maybe increased with larger sizes of magnet wire. Accordingly, there is an opportunity for improved winding wires or magnet wires incorporating conformal coatings that provide additional dielectric protection for imperfections, fault sites, and/or exposed conductor portions.

|ΘΘ06] Further, recent developments in certain applications have led to a demand for •magnet wire designs with improved electrical properties, such as increased dielectric strength and/or increased partial discharge inception voltage f DIV"). The dielectric strength of a material generally refers to the maximum applied electric field that the material can withstand w thout breaking down. The PDIV generally refers to the voltage at which electrical discharges that do not completely bridge the insulation between electrodes or conductors start to occur. There is also an increased demand for magnet wire to function in higher temperature applications and/or environments. For certain applications, such as vehicle applications, it may also be desirable for magnet wire to be resistant to hydrocarbon oil, other chemicals,, and/or moisture. For example, in some motor applications, magnet wire is at least partially submerged in transmission fluid. This transmission fluid can break, down traditional magnet wire insulation materials, such as enamel: insulations.

(0007 Additionally, in many applications, it. is desirable to limit -or minimize overall insulation thickness in order to permit a higher amount of magnet wire to be packed or formed into an electrical device coil or formed into a greater number of components for incorporation into an assembly. The performance of an electrical device is strongly correlated to an amount of magnet wire that can be placed into an available core slot area. Reducing the thickness of

1 magnet wire insulation may permit higher power output and/or increased performance. Accordingly, there is an opportunity for improved^' magnet wire having desired electrical properties with limited increases. or even decreases to overall, insulation thickness,

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The detailed description is set fort with, reference to the accompanying figures. In the. figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The use of the same reference numbers in different figures indicates similar or identical items; however, various embodiments may utilize elements and/or components other than those illustrated in the figures. Additionally, the drawings are provided to illustrate example embodiments described herein and are not intended to limit the scope of the disclosure,

{0009] FIG. 1 is a perspective view of- an example magnet wire thai includes at least one conformal layer, according to an illustrative embodiment of the disclosure.

{0010] FIGS. 2A-2D are cross-sectiona l views of example magnet wire constructions that include at least one conformal layer, according to illustrative embodiments of the disclosure.

{00111 FIGS, 3A-3F illustrate example cross-sectional shapes that may be utilized for magnet wire in accordance with various embodiments of the disclosure.

{0012] FIGS. 4A-4D illustrate example articles that may be formed from magnet wire in accordance with various embodiments of the disclosure.

{0013] FIG. 5^'depicts an example component of an electric machine that may incorporate one or more magnet wire articles, according, to an illustrative embodiment of the disclosure.

{0014] FIG, 6 illustrates a flow chart of an example method for forming magnet wire that includes at least two coflformal. layers in accordance with an illustrative embodiment of the disclosure.

[0015] FIG. 7 illustrates a flow chart of an example method for forming a magnet wire article in accordance with an illustrative embodiment of the disclosure. fi¾ ½i FIG. 8 illustrates a flow chart of an example method for forming an electric machine or other assembly in accordance with an illustrative embodiment of the disclosure.

DETAILED DESCRIPTION

[0O17J Various embodiments of the present disclosure are directed to articles- formed from^•insulated winding wires or magnetic winding wires (hereinafter referred to as "magnet wire") and to appliances or assemblies incorporating the articles. A magnet w re or portion of a magnet wire may be worked, bent twisted, and/or otherwise processed in order to form an article with desired -shape. For example, a hairpin or article having an approximate U-shape may be formed. A conform al coating, such as a coating that contains, parylene, may be formed, on the- article- The conformal coating may assist in eliminating pinhole defects in the magnet_, wire. For example, defects in- underlying insulation (i.e., an underlying enamel layer, etc.) may^¬ be covered by one or mors conformal layers thereby reducing the likelihood of insulation, breakdown. In certain embodiment s, conformal coating(s) may also pro side improved electrical properties relative to conventional magnet wire insulation, i©018] Embodiments of the disclosure- now will be. described, more fully hereinafter with reference to the accompanying drawings, in which certain embodiments of the disclosure are shown. Tin^'s invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the -invention to those skilled in the art. Like numbers refer to like elements throughout.

{00191 With reference- to FIG. 1, a perspective view of an example magnet wire I^'OO is illustrated in accordance with an embodiment of the disclosure. The magnet wire 300 may include a central conductor 105, any number of base layers of insulation 110 formed around the central conductor 105, and. at- least one conformal layer 1 15, such as a parylene-containing layer, formed as^'a top coat or outermost layer. As desired, the base insulation 1 10 ma^'include any number of sublayers, such as the- four sublayers 1.20A-D illustrated in FIG. 1. Each of the layers or components of the magnet wire will now be described in greater detail. |802O] The conductor 105 may be formed from a wide variety of suitable materials or combinations of materials. For example, the conductor 105 may be formed from copper, aluminum, annealed copper, oxygen-free copper, silver-plated copper, nickel plated copper, copper clad aluminum ("CCA"), silver, gold,, a conductive alloy, a bimetal, or any other suitable electrically conductive material. Additionally, the conductor 105 may be formed with, arty suitable dimensions and/or cross-secliohal shapes. As -shown, the conductor 105 may h ve an approximately rectangular cross-sectional shape. However, as explained in greater detail below with reference to FIGS. 3A-3F, the conductor 105 may be formed with a wide variety of other cross-sectional shapes, such as a rectangular- shape (i.e., a- rectangle with sharp rather than rounded comers), a. square shape, an approximately square shape, a circular shape, an elliptical or oval shape, etc. Additionally, as desired, the conductor 105 may have corners that are rounded, sharp, smoothed, curved, angled, truncated, or otherwise formed.

(0G211 In addition, the conductor 105 may be formed with any suitable dimensions. For example, a rectangular conductor may have longer sides between approximately 0.020 inches (508um) and approximately 0,750 inches_. (19050μίο) and the shorter sides between approximately 0.020 inches (508um) and approximately 0.400 inches (10160μπι). An example square conductor may have sides between approximaiely 0.020 inches (50Spm) and approximately 0.500 inches (12700μ^ηι). An example round conductor may have a. diameter between approximately 0.010 inches (254prn) and approximately 0.500 inches (12700μιη). Other suitable dimensions may be utilized as desired, and the described dimensions are provided by way of example only. Additionally, in certain, embodiments, the conductor 105 may have a cross-sectional area larger than, approximately 18 AWG or its equivaleai for non- round conductors. Accordingly, -a round conductor may have a diameter greater than, or equal to approximately 0.0403 inches or approximately 1.024 mm (Ϊϋ24μ.ηι) and/or a cross-sectional area greater than or equal to approximately 1.62 kcmii or approximately 0.823 mm². Conductors with other cross-sectional shapes (e.g., rectangular conductors, etc.) may include cross-sectional areas greater than or equal, to approximately 1.62 kcmil.or approximately 0.823 mm². The dimensions of these conductors (e.g., length, width, etc.) m be sized to provide a desirable cross-sectional area.

{0022] A wide variety of suitable methods and or techniques may be utilized to form, produce, or otherwise provide a conductor 105. In certain embodiments, a conductor 105 may be formed by drawing an input material (e.g.,. a larger conductor, rod stock, etc.) with one or more dies in orde to reduce the size of the input materiai to desired dimensions. As desired, one or more fiatteners and/or rollers may be used to modify the cross-sectional shape of the input materiai before and or: after drawing the input material through any of the dies. In certain embodiments, .the conductor 105 ma be formed in tandem with the application of a portion or all of the insulation, in. other words, conduc tor formation and application of msukiioii material may be conducted in tandem, in other embodiments, a conductor 105 with desired dimensions may be preformed or obtained from an .external source. Insulation materia! may then be applied or otherwise formed on the conductor .105, f©923] FIG. 1 illustrates a magnet wire 100 that includes base insulation 110 formed around a conductor 105 prior to the application of at least one layer 115 containing parylene, in other embodiments, one or more layers containing' parylene may be. formed directly around a conductor. FIG. 2 A illustrates an example magnet wire 200 in which one or more layers containing parylene are formed around a conductor 202. For example, a first layer 204 containing a first parylene. material is formed around the conductor 202, A. second layer 206 containing a: second parylene material different than the first parylene material is then formed aroimd the first layer 204. An optional layer 205, sueh .as an adhesive layer, may be positioned between the two layers 204, 206 containing parylene. Any number of suitable layers containing parylene may be formed as desired.

[0024]: In embodiments that include base insulation 110, the base insulation 11.0 may inc lude one or more- suitable layers of insulating, dielectric, and/or semi-conductive materials, in the event that the base insulation. 110 includes a plurality of sublayers, my number of sublayers may be utilized.- In certain embodiments, the sublayers may be formed from the same materials or combinations of materials. For example, sublayers may be formed as a plurality of enamel layers, and each enamel layer may be formed from the same polymeric material in other embodiments, at least two of the sublayers m ay be formed from different materials. For example, different enamel layers ma be formed from different polymeric materials. As another example, one or more sublayers may be formed from enamel while another sublayer is formed -from as extruded thermoplastic, material. A few example magnet wires with different base insulation configurations are. illustrated in. FIGS. 2B-2E and discussed below. f OlS] In certaia embodiments, the base insulation 110 may include one or more layers of enamel, For example, FIG. 2B illustrates an example magnet wire 210 in which enamel 214 is used as base insulation formed, on. a conductor 212, and then one or more layers 216 containing pary!ene are formed over the enamel 214. An enamel layer is typically formed by applying a polymeric varnish to the conductor 1.05 -and hen baking the conductor 105 in a suitable enameling oven or furnace.- As desired, -a plurality of layers of enamel may be applied to the conductor 105 in order to achieve a desired enamel thickness or build. Additionally, each. layer, of enamel and/or a total enamel build may haye any desired thickness, -such as a thickness. of approximately 0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.010 inches, thicknesses included in a range between any two of the aforementioned values, and/or thickness included in a range bounded on either a minimum or maximum end by one of the aforementioned values.

[0026} A wide variety of different types of polymeric materials may e utilized as desired to form an enamel layer. Examples of suitable materials include, but are not limited to, polyi ttde, polyamideimide, amideimide, polyester, polyesterimide, polysulfone, polyphen lenesulfone, polysulfide, polyphovylenesulfide, polyethe imide, polyamide, etc. In eertain_. embodiments, enamel materials having relatively low dielectric constants '¾", such, as dielectric constants below approximately 3.5 at approximatel 25"^"€, ma be utilized in order to improve electrical performance. As desired, enamel materials may be selected to have a suitable National Electrical Manufacturers Association 'NBMA") thermal class or rating, such as a rating of A, B, F, H, N, R, S, or higher. Higher temperature enamel materials may having a NEMA thermal class rating of R, S, or higher. Additionally, in certain embodiments, at) enamel layer may be formed as a mixture of two or more materials. Further, in certain embodiments, different enamel layers may be formed from the same material(s) or from different materials. For example, a first enamel layer may be formed from a polymi tde material and a second enamel layer may be formed from a polyamideimide material.

ΪΘ027] n certain embodiments, one or more suitable filler materials and/or additives may be incorporated into an enamel layer. Examples of suitable filler materials include, but are not limited to, inorganic materials such as metals, transition metals, lantlianid.es, aetimdes, metal oxides, and/or hydrated oxides of sui table materials such as aluminum, tin, boron, geimanium, gallium, lead, silicon, titanium, zinc, yttrium, vanadium, zirconium, nickel, etc.; suitable organic materials such as polyamlme, polyaceiylene, polyphenylene, poiypyrroie, other electrically conductive particles; and/or any suitable combination of materials. The filler material(s) may enhance the corona resistance of the enamel and/of the overall insulation system. In certain embodiments, the filler niaterial(s) may also enhance one or more thermal properties of the enamel and/or overall insulation system, such as temperature resistance, cut- through resistance, and/or heat shock. The particles of a filler material may have any suitable dimensions, such as any suitable diameters. In certain embodiments, a filler material may include nanoparlicies. Further, any suitable blend or mixture ratio between filler material and enamel base material ma be utilized.

[ 0 81 In certain embodiments, the base insulation 110 may include one or more suitable wraps or tapes, such as a polymeric tape. As desired, additional materials or additives may be incorporated mto, embedded into, or adhered to a tape, A tape may include a wide variety of suitable dimensions, such as any suitable thickness and/or width. Additionally, a tape may be wrapped around the conductor 105 at an angle along a longitudinal direction or length of the conductor.

[0029] In other embodiments, the base insulation 110 may include one or more layers of extruded material. As desired, extruded layer(s) may be formed directly on the conductor 105 or, alternatively, over one or more underlying layers (e.g., one or more enamel layers), FIG. 2C illustrates an example magnet wire 220 in which an extruded layer 224 is formed on a conductor 22.2, and then one or more layers 226 containing parylene are formed over the extruded layer 224. FIG. 2D illustrates an .example magnet wire 230 in which one or more enamel layers 234 are formed around a conducto 232, and then one or more extruded layers 236 are formed around the enamel layer(s) 234. One or more layers 238 containing parylene may then be formed around the extruded- layers) 236.

{0030} In certain embodiments, an extruded layer may be formed from a- suitable .thermoplastic resin, A wide variety of suitable materials may be incorporated into a resin or into a plurality of resins that are utilized to form extruded layers. Examples of suitable materials include, but are not limited to, pohyether-ether-ketone (^''PEEK -'), polyaryletherketone {"PAEK"), polyetheremerketoneketone. ("PEE fC), polyeiherketoneketone ("PEKK^"), polyeiherketone {"ΡΕΚ'"), polyetherketoaeketoneetherketoae ("PE KEK"), polyketone ("PK")_{> 0}†j,_er stable material that includes at_. least one ketone group, thermoplastic polyim.de ("PI"), aromatic polyarmde, aromatic polyester, polyphertylene sulfide ("PPS"), materials that combine one or more fluoropolymers with base materials (e.g., materials tha include at least, one ketone group, etc.), any -suitable -thermoplastic material, etc. In certain embodiments, a single extruded layer may be formed. In other embodiments, . . plurality of extruded layers may be formed. If a plurality of layers is utilized, the extruded layers may be formed from the same material or, alternatively, at least two layers may be formed from different materials.

(0031 J An extruded layer may be formed with any suitable thickness as desired is various embodiments. For example, an: extruded layer may be formed with a thickness of approximately 0.001, 0.002, 0.003, 0.004, 0,005, 0.006, 0.007, 0,008, 0.009, 0.010, 0.012, 0.015, 0.017, 0.020, 0.022, or_.0.024 inches, a thickness included in grange between any two of the aforementioned values, or a thickness included in a range bounded on either a minimum or maximum end by one of the aforementioned values, !a certain embodiments, an extruded layer may be formed directly on the conductor 105 or an underlying layer (e_tg., an enamel layer, etc.). For example, the temperature of the magnet wire 100 may be controlled prior to the application of an extruded, layer to eliminate the need for an adhesive layer, hi other embodiments, one or more suitable bonding agents, adhesion promoters, or adhesive layers ma be incorporated .between, the extruded layer and an underlying component or layer. Additionally, in certain embodiments, the. extruded laye 1 15 may be formed to have a cross- sectional shape similar to tha of the underlying conductor 105 and or any underlying insulation layers. la other embodiments, an -extruded layer may be- formed with a cross-sectional shape -feat varies from that of the underlying conductor 105. As one non-limiting example, the^•conductor 105 may be -formed with an elliptical cross-sectional shape while an extruded layer is formed with an approximately rectangular cross-sectional shape,

[QS321 I - certain embodiments, one or more semi-conductive layers may be incorporated into the magnet wire 100. For example, one or more semi-conducti ve layers may be formed on the conductor- 105 and or incorporated into the base insulation 110. Asyet another example, one- or more semi-conductive layers may be formed on top of the base insulation 1 10. FIG. 2E illustrates an example -magnet wire 240 in which a semi-conductive layer 244 is formed around a. conductor 242.. Base insulation 246 (e.g., one or more enamel layers, one or more extruded layers, etc.} is formed on the semi-conductive layer 244, and one or more layers 248 containing parylene are formed on. the base insulation 246.

|8®33] A semi-conductive layer may have a conductivity between that of a conductor and that of an insulator. Typically, a semi-conductive layer has a volume conductivity (o) between approximately 10^*8 Siemens per centimeter- (S/cm) and approximately 10³ S/cm at approximately 20 degrees. Celsius (^"C). A semi-conductive layer may be -formed from a wide variety of suitable materials -and/or combinations- of materials. For example, one or more suitable semi-conductive enamels, extruded semi-conductive materials, semi-conducti ve tapes, and/or semi-conductive wraps may be utilized, in certain, embodiments, a semi-conductive layer may be formed from a material that combines one or more suitable filler materials with one or more base materials. For example, semi -conductive and/or conductive filler material may be combined with one or more base materials. Examples of suitable filler materials include, but are not limited to, suitable inorganic materials such as metallic materials and/or metal oxides (e.g., zinc, copper, alumiimm, nickel, tin oxide, chromium,- potassium titanate, etc.), and/or carbon black; suitable organic materials such as polyanilkke, polyacetylene, polyphenylene, poiypyrrole, othe electrically conductive particles; and pr any suitable combination of materials. The particles of the filler material may have any suitable dimensions, such as any suitable diameters. In certain embodiments, the filler material may include nanoparticl.es Examples of suitable base materials may include, but are not limited to, polyiroide, polyamideimide, amideimi.de, polyester, polyesterimide, polysulfone, poiyphenylenesulfone, poiysulfjde, polyphenylenesuif.de, polyetberimide, poiyamide, or any other suitably stable high temperature thermoplastic or other material Further, any suitable blend or mixture ratio between filler material and base material may be utilized.

[0034] Additionally, a. -semi-conductive layer may have any suitable thickness. For example, one or more semi-conductive layers may have thicknesses similar to those discussed above for enamel layers. In certain embodiments, one or more semi-conductive layers may be formed in a similar manner as -an enamel layer. For example, a varnish including semi- conductive material may be applied, and the varnish may be heated by one or more suitable .heating devices, such as an enameling oven. In other embodiments, one or more, semi- conductive layers may be extruded. As a result of incorporating one or more semi-conductive layers into the magnet wire 100, non-xmifor electric, magnetic, and/or electromagnetic fields (hereinafter collectively referred to as electric fields) may be equalized or "smoothed out" thereby reducing local stress in the insulation and improving electrical performance, In other words, one or more semi-conductive layers may assist in equalizing voltage stresses in the insulation and/or dissipating corona discharges at or near the conductor 105 and/or at or near a surface of the magnet wire 100. l^'0©35i As desired in various embodiments, any combination of layers and/or materials may be utilized to form the base insulation 1 10, For example, the base insulation 1 10 may include any suitable combination of enamel, extruded, tape, semi-conductive, and/or other layers. Additionally, the base insulation 110 (and/or any sublayers) may be formed with any desired concentricity, which is the ratio of the thickness of a layer to the thinness of the layer at any given cross-sectional along a longitudinal length of the magnet wire 100. In certain embodiments the base insulation 1 10 and/or any sublayer may be formed^' with a concentricity less than or equal to approximately 1.1, 1.2, 1.3, 1 ,4, 1.5, or any other suitable value. Additionally, regardless of the number of. sublayers incorporated into the base insulation 10, the base insulation 110 may have any desired overall thickness. As desired, the base insulation 110 may be formed from one or more layers that have any number of desirable properties, such as desired P.DIV, dielectric strength, dielectric constant, and/or thermal rating values. For example, the base insulation 1 10 may have a thermal rating of 180" C, 200^' C, 220° C, 240° C, or higher,

10 36) With continued reference to FIGS. 1 and 2A-2E, according to an aspect of the disclosure, one or more conformal layers may be formed as outermost layers of a magnet wire. For example, one or more layers 115 containing parylene may be formed around, the conductor 105. As desired, the conformal !a,yer(s) ma be formed on a conductor or on base insulation. Additionally, an adhesion promoter may optionally be applied to an underlying layer (e.g., a conductor, base insulation, etc.) prior to the formation of a conformal layer, in certain •embodiments, a single conformal layer may be formed. In other embodiments, two or more conformal layers may be formed. Each conformal coating (generally referred to as coating 115) may consist of a relatively thin polymeric film that conforms to the contours of an underlying magnet wire, article formed from a magnet wire, or an appliance incorporating a magnet wire. Additionally, a conformal coating 1 15 may be applied utilizing a wide variety of techniques. For example, a conformal coating 115 may be applied via one or more suitable chemical vapor deposition, techniques, in other embodiments, a conformal coating 115 may be applied via brushing, dipping, spraying, and/or other suitable methods. Certain embodiments of the disclosure described herein discuss conformal coatings that include parylene. However, other suitable materials and/or combinations of materials may be utilized to form and/or incorporated into conformal coatings. Examples of suitable materials, include, but are not limited to, one or more acrylic materials, one or more epoxy materials, polyurethane, silicones, poiyimides, fluoropolymers, etc.

(0037J In the event that a conformal coating 115 includes a parylene material, a wide variety of different types of parylene may be utilized as desired in various embodiments of the disclosure,^'In general, a parylene material is a^■poly(p-xylylene) polymer that may be formed from a .suitable dimer (e.g., cydophane dimers, etc.). Examples of parylene (with example Chemical Abstracts Service or "CAS" identifiers) include, but are not limited to. parylene N (e.g., CAS 25722-33-2 formed from dimer 1.633-22-3), parylene C (e.g„ CAS 9052-19-2 formed from dimer 10366-05-9, CAS 28804-46-8, etc.), parylene D (e.g., CAS 52261-45-7 formed from dimer 30501-29-2), parylene HT or parylene AF-4 (e.g., CAS 334.5-29-7 formed from dimer 3345-29-7, .etc.), parylene F (e.g., CAS 1785-64-4 formed from dimer 1785-64-4), parylene A, parylene AM, parylene H, parylene SR, parylene. HR, parylene NR, parylene CF, and/or parylene SF. In certain embodiments, the parylene materials utilized may be commercially available products manufactured and marketed by Specialty Coating Systems, Inc., which is based in Indianapolis, Indiana. In oilier embodiments, the parylene materials may be commercially available products manufactured and marketed by ISCO Conformal Coatings, LLC, which is a multinational company headquartered in Japan. Specialty Coating Systems offers parylene N, parylene C, parylene D, and parylene HT products. Parylene N, also referred to as poly(para-xylylene), is a completely linear, highly crystalline material. Parylene C may be produced from the same raw material (e.g., dimer) as parylene N, modified by the substitution of a chlorine atom for one of the aromatic hydrogens. Parylene. D may also be produced from the same raw material as parylene N, modified by the substitution of chlorine atoms for two of the aromatic hydrogens. In parylene HT and/or parylene AF-4, the 4 alpha hydrogen atoms of the parylene N dimer may be replaced, with fluorine. Parylene HT may be particularly useful in high temperature applications (e.g., applications with short term temperatures up to 450° C) and/or applications in which relatively long-term UV stability is required. Additionally, parylene HT may have the lowest coefficient of friction and dielectric constant of the deseribed variants, in parylen© F, Sun ise may be included on a ring. Other types and' or variants of parylene. may be utilized as desired. A few of the properties of several different parylene variants arefllustrated in Table 1 below:

Table 1 : Par. lene Properties [08381 iSCO offers parylene products in several different varieties, including parylene C, parylene Ό, parylene 1\y arylene A,_.parylene AM, parylene H, parylene SR, parylene HR, paiyiene R, parylene CF, and/or parylene SF. Any of these different maiedals may be utilized in various embodiments of the disclosure,

|0039J In certain embodiments, a single layer 115 containing paryiene may be utilized. I» other embodiments, a plurality of layers containing- parylene ma be utilized. As desired, one or a plurality of parylene-contaimng layers may be formed as the sole insulation on a conductor or, alternatively, be utilized in conjunction with one or .more other insulating layers (e.g., enamel layev{s), extruded thermoplastic layers, etc.). For example,, one ox more parylene- containing layers may be formed over base insulation . 10. Additionally, in certain embodiments that utilize a plurality of parylene-containing layers, a first parylene-containing layer may include a first paryiene material while a second paryJene-containing layer includes a second parylene material different than the first parylene material. For example, the first paiylene-containing layer may include one of the parylene materials (or a first combinat ion of materials) described above while the second parylene-containing layer H5A includes a different -one of the paryiene materials (or a different_, combination of materials) described above. Given the costs of various paiyiene materials, the use of two different parylene layers may permit the formation of a desired insulation structure while reducing overall cost. For example, a less expensive parylene material may be utilized as an interior layer while a more expensive parylene material is utilized as an outer layer.

{0040^'j in certain embodiments with raul tiple parylene-containing layers, a second paiyiene layer 13 SB may be formed directly on the first paiyiene layer 1 15A. For example, a layer of paiyiene N or parylene C may be .overcoated with a layer of .parylene HT or parylene AF-4. in other embodiments, one or more intervening layers may be positioned between two layers of_.parylene. For example, an adhesive layer or layer containing one or more adhesion promoters may be positioned between the two layers containing parylene. FIG. 2A illustrates an example magnet wire that includes an intervening layer 205 positioned between the two parylene layers 204, 206, A wide variety of suitable adhesion promoters may be utilized as desired in various embodiments including, but not limited to, materials that contain silane, organosilane, chlor silanes, methoxy silanes, ethoxy siianes, amino silanes, secondary amino silanes, oligomerie diamitto silanes, etc. For example, an Α-Γ74 silane material (CAS 2530-85-0) or a similar material may be utilized. A few non-limiting examples of commercially available adhesion promoters include; Dynasyfcm® AMEO, Dynasylan® 1 146, . Dynasylan® 1124, TEGO® VariPl s, and TEGO AddBond manufactured and sold by the Evonik Degussa Corporation; B Y -4510 manufactured and sold by Altana AG; AdPro Plus and AdPro Poly manufactured and sold by Specialty Coating Systems, Inc., etc,

[004!] In. certain embodimeats, an adhesion promoter ma be based on a sHarte- material having hydrolysable groups on one end of the molecules and reactive nonhydrolyzable groups on the other end of the molecules, The hydrolysable groups may react with moisture to yield silanol groups, which in turn may react with or adsorb inorganic surfaces to enable strong bonds. The nonhydrplyzble groups may be compatible with resin formulations.

[0042] A parylene layer 115 may he formed_., with a wide variety of suitable thicknesses. In various embodiments, a .parylene layer 115 may have a thickness as thin as approximately several hundred angstroms- to as thick as- approximately- 75 μι^η, In certain embodiments, a parylene layer i 15 may be formed with a thickness between approximately one micron (I jim) and approximately 40 urn. In various embodiments, a parylene layer may have a thickness of approximately 0.5 um, approximately 1 μηι, approximately 2 μιχι, approximately 3 um, approximatel 4 um, approximately S um, approximately 6 \xm, approximately 7 μπι, approximately 8 um, approximately 9 μ¾η, approximately 10 um, approximatel 1 1 um , approximately 12 μηι, approximately 13 μι«, approximately 14 um, approximately 15 μιη, approximately 20 μιη , approximately 25 μτη, approximately 30 μπι, approximately 35 um, approximately 40 um,. approximately 50 μηι, approximately 60 μιη, any value included in a range between two of the above values, or any value included in a range bounded on either a minimum or maximum end by one of the above values. Further, the thickness of a parylene layer 115 may refer to the thickness on_. one surface of a magnet wire or other coated article. With a parylene layer 115 formed around a magnet wire, the total "build" of the parylene will be approximately two times that of the thickness, at a surface. Additionally, in certain embodiments, a plurality of parylene layers may he. formed with substantially similar or approximately equal thicknesses. In other embodiments, at. least two parylene layers may be formed with different thicknesses-.

10043] A wide variety of suitable, methods and/or techniques may be utilized as desired in order to form a. parylene-containing layer 115. For example, parylene may be applied via a acuum deposition process. As no stable liquid phase of parylene has been isolated, parylene may be applied in its vapor or gaseous state via a deposition process. Accordingly, parylene does not suffer from any fluid effects that can cause pooling, flowing, bridging, meniscus, and/or edge-effect flaws. Parylene may also be relatively free of solvents, catalysts, and/or plasticizers. In one example embodiments, a solid dimer of a parylene material may be vaporized. A quantitative cleavage or pyrolysis of the dimer vapor at the two methylene- methylene bonds ma he performed- in order to yield a stable monomelic vapor. The rnonomeric vapor may then be provided into a deposition chamber where it polymerizes on a magnet - wire, preformed magnet wire article, or appliance incorporating magaet wire, In certain embodiments, the parylene may be permitted to polymerize .at approximately room temperature. A desired thickness of parylene may be obtained based on an amount of time thai the magnet wire 100 or other substrate remains in the chamber. The parylene will deposit and/or polymerize in a eonfonnai manner.

[0044] As desired in various embodiments, one o more parylene-containing layers 115 may be formed at a wide variety of different, steps during the man facture of magnet wire 100 or the incorporation of magnet wire into an appliance. In certain embodiments, one or more parylene-containing layers 115 may be formed around a magnet wire, such as magnet wire 100. The magnet wire 100 may then be provided downstream for further processing. In other embodiments, one or more parylene-containing - layers 115 may be applied to a preformed^' winding wire or magnet wire article, such as a preformed coil of wire, a preformed hairpin, a waveform, or other section of shaped wire. For example, a magnet wire 100 may be formed into hairpins (e.g., approximately U-shaped hairpins, etc.) or other desired shapes prior to incorporation into a rotating electric machine (e.g., motor, generator, starter, alternator, etc). A few example ankles thai may be formed from magnet wire 100 are described in greater detail below with reference to FIGS. 4A-4-D. During the .forming and/or processing of the magnet wire 100, tine wire 100 may be cut and/or bent, thereby resulting in insulation faults and/or exposed portions of the conductor. In certain embodiments, the application of parylene layers may be conducted in a batch process. For example, one or more preformed magnet wire articles may be formed, and parylene coatings maybe formed on the articles prior t the articles being inserted into rotating electric machines or other appliances. The application of one or more parylene layers may result in a. conforms! coating that reduces and/or eliminates insulation faults, thereby improving electrical performance. The parylene layer(s) may also provide for resistance to various oils and/or chemical substances.

[0045] In yet other embodiments, magnet wire 100 and/or magnet wire articles (e.g., preformed hairpins, etc.) may be incorporated into an electrical appliance. Examples of suitable electricai appliances include, but are not limited to, motors, generators, alternators, starter-generators, rotating electric machines, etc. An example stator 500 that may incorporate hahpias and/or other articles is illustrated in FIG. 5, For example, magnet wire hairpins may be inserted into associated slots within art appliance. Once inserted or otherwise incorporated, one or more layers containing parylene may be formed on the appliance or assembly. The parylene-containing layer(s) may function as an overcoat or varnish that improves electrical performance. For example, the parylene-containing layers may reduce insulation faults and/or exposed conductor portions. The conformal coatings may assist in insulating the magnet wire 100 or magnet wire articles from contaminants. In certain embodiments, the parylene- containing layer(s) may additionally assist in securing the magnet wire and/or magnet wire articles within the appliances (e.g., .within motor slots, etc). Further, in certain embodiments, the application of the parylene-eontaining layer(s) may eliminate the conventional step .or process of applying a relatively messy varnish to the appliance. The elimination of this varnish application may reduce the amount of energy required in appliance assembly. Additionally, the elimination of the varnish application may reduce the use of relatively volatile chemicals that may pose environmental and health risks,

10046} In certain embodiments, magnet wire 100, magnet wire articles, appliances, and/or other substrates (e.g., a conductor, base insulation, etc.) on. hich parylene-containing layers are formed may be treated with one or more suitable adhesion promoting agents prior to the formation of one or more parylene-containing layers. A wide variety of suitable adhesion promoters may be utilized as desired in various embodiments, such as any of the examp!e_: adhesion promoters discussed above.

(©047] As a result of forming one or more parylene-containing layers 1 15 on. magnet wire 100, magnet wire articles, and/or appliances containing magnet wire, a conformal and/or insoluble coating may be formed that eliminates and/or reduces defects, faults, voids, pinholes, and/or exposed portions of the conductor 105. The reduction and/or elimination of pinholes and/or other defects may improve the electrical performance and/or life cycle of the magnet wire 100. Additionally, the parylene layer(s^') I IS may promote resistance of oxidation, humidity, chemicals, oils (e.g., transmission fluid, etc.), and/or ultraviolet ("UV^") light. Parylene may also provide a lower coefficien t of friction, thereby allowing a magnet wire 100 to be more readily incorporated into n appliance. For example, as a winding.or coil is formed, the lower coefficient of friction may reduce the chances of a first turn catching on a second turn and thereby damaging the Insulation. In certain embodiments, magnet wi e 100 incorporating one or more parylene layers 115 may be hydroiyiically stable and resistant to oils and/or liquids, such as transmission fluid. The parylene Iayer(s) 115 may protect base insulation 1 1_.0 and/or the conductor 105, thereby permitting the magnet wire to be directly in contact with or submerged in oil, automatic transmission fluid, and/or similar lubricants or fluids. 0481 Certai types of magnet wire may have relatively large diameters, cross-sectional areas, or gauges in order to achieve a desired electrical appliance output. For example, round magnet wire larger than approximately 18 AWG (or other cross-sectional shapes of wire having a cross-sectional area larger than an 18 AWG equivalent may be formed with relatively thick insulation in order to attain desired electrical, performance (e.g., PDIV, breakdown voltage, etc). In certain embodiments, the use of one or more parylene layers 1 15 ma result in increased electrical performance (e.g., improved PDIV, improved thermal and/or high temperature performance, etc.) and/or other improved performance (e.g., reduced coefficient of friction, etc.). In other embodiments, the use of one or more parylene layers 115 may permit a desired electrical perfomiance to be attained while simultaneously reducing the thickness o the base insulation 110. As- a result, the overall thickness of the magnet wire 100 may be reduced, thereby permitting higher packing of the magnet wire 100 w thin an appliance (e. g. , a rotating electric machine, etc.). This higher packing may result in improved output.

1094 } A magnet wire 100 incorporating- one or more parylene layers 115 may be engineered to have a wide variety of suitable electrical, performance properties, such as any suitable dielectric strengths. FDIVs, and/or thermal ratings. In certain embodiments, a layer of parylene may have a dielectric strength in excess of approximately 7,000 volts/mil. in certain embodiments, a magnet wire 100 that incorporates one or more parylene layers 1.15 (i.e., a wire 100 with a parylene layer formed over base insulation, etc.) may have a dielectric strength greater than approximately 10,000, 11,000, 12,000, 13,000, 14,000, 15,000 volts, or higher. Additionally, a magnet wive 100 incor orat ng one or more paryiene layers 115 may have a PDIV greater^' than a.desired threshold value, such as approjdmately 1,000, 1,300, 1 ,500, 1 ,700, 2,000, 2,500 volts, or higher. A magnet wire incorporating one or more paryiene layers 1 15 may also be engineered to have a wide variety of thermal ratings, such as a thermal rating that permits relatively continuous (e.g., a time period such as 1,000, 5,000, or 20,000 hours, etc.) use at temperatures up to approximately 200^°€, 220^° C, 240^° C, or higher without degradation of the insulation.,

[0050] A magnet wire 100 or magnet wire article formed in accordance with embodiments of the disclosure may be suitable for a wide variety of applications. For example, the magnet wire may be suitable for use in automobile motors, starter generators for hybrid electric vehicles and/or electric vehicles, alternators, etc. As desired, the insulation system may permit the magnet wire 100 to satisfy relativel stringent electrical performance. characteristics (e.g., dielectric strength requirements, PDIV- requirements, etc) while being sufficiently thin to allow relatively tight packing or coiling of the magnet wire 1⁽30. As a result, the performance and/or output of an electrical machine or appliance formed using the magnet wire. 100 {e.g., a rotary electrical machine, etc.) may be enhanced relative to machines formed utilizing conventional magnet wire.

[iJOs!f The magnet wire 100 described, above with reference to FIG. 1 is provided by way of example only. A wide variety of alternatives could be made to the illustrated magnet wire 100 as desired in various embodiments and as discussed with reference to FIGS. 2A-2E, For example, a base layer 110 may be formed with any number of sublayers. As another example, the cross-sectional shape of the magnet wire 100 and/or one or more insulation layers may be altered. Indeed, the present disclosure envisions a wide variety of suitable magnet wire constructions. These constructions may include insulation systems with any number of layers- and/or sublayers.

{0052] As set forth above, a magnet wire and/or various insulation layers of a magnet wire may be formed with a wide variety of suitable cross-sectional shapes. FIGS. 3A-3F illustrate example cross-sectional shapes that may be utilized for magnet wire in accordance with various illustrative embodiments of the disclosure. Although the shapes in FIGS, 3 -3F arc illustrated as conductor- shapes, it will be appreciated that similar shapes arid or outer peripheries may be utilized for various insulation layers. |69S3) Turning first to FIG. 3 A, a first example magnet wire 300 is illustrated as having an approximately rectangular cross-sectional shape. As shown, the comers of the magnet wire 300 may be rounded, blunted, or truncated. FIG. 3B illustrates a second example magnet wire 305 having a rectangular or approximately rectangular cross-section with relatively sharp comers, FIG. 3C illustrates a third example magnet wire 310 having an approximately square cross-sectional shape with rounded comers. FK1 3D illustrates a fourth example magnet wire 315 having a square or approximately square cross-sectional shape with relatively sharp comers. FIG. 3E illustrates a fifth example magnet wire 320 having a circular cross-sectional shape, and FIG. 3F illustrates a sixth example magnet wire 325 having. an elliptical or oval cross-sectional shape. Other cross-seetioaa! shapes may he utilized as desired, and the shapes illustrated in FIGS. 3A-3F are provided by way of non-lim ting example only.

[0054} In -certain embodiments, a magnet wire (or a portion of a magnet wire), such as any of the example magnet wires discussed above with reference to FIGS. I-2E, may be formed into an article having a desired or predefined shape. For example, a magnet wire may be cut into sections with any desired lengths, and the sections of magnet wire may be bent, twisted, and/or otherwise formed into articles with any suitable shapes. An article may include one or more bends or twists that result, in the article having an overall shape other than thai of a straight wire or a wire wrapped on a spool. In certain embodiments, an. article may include one or more relatively sharp or unsmooth bends.. For example, a bend may have a curvature greater than a curvature associated with or recommended for spooling the magnet wire. In certain- embodiments, an article may include, at least one bend that forms or approximately forms an angle. In other words, two portions of the article may extend from either side of a bend in different direciions. in the event that a bend forms or approximately forms an. angle, a wide variety of suitable angles, may be utilized as desired in an article. For example, a bend may have .an angle of approximately 30·^*, 40^'", 45', 50 60°, 70^', 80^°, 90°, 100°, 1 10°, 120", 130% 135% 140% 150% 160% 370% 180% an angle included in a ange between any two of the above values, or an angle included in a range bounded on either a minimum or maximum end by one of the above values (e.g., an angle equal to or greater than approximately 90% etc.). 055 in other embodiments, an article may include one or more twists. Fo example, the magnet wire used to form the article may be. twisted in a rotational direction (e.g., a clockwise or counter clockwise direction, etc) relative to the longitudinal direction in which the magnet wire extends. Any suitable twist rate may be utilized as desired. In certain embodiments, the magnet wire may be twisted and bent at a given location. Ao article may be formed with a wide variety of suitable shapes, in certain embodiments, articles may be formed as hairpins having a "IT or an approximately "IT shape. For example, an article may have a U-shaped end turn with two legs extending from the end turn. The term "If^* shape is not intended to be limiting and may cover a wide variety of shapes including an end turn with legs extending from the end turn, such as a " V" shape or a "W^M: shape. As desired in various embodiments, the two legs may have either unequal or approximately equal lengths. In other embodiments, an article may toe formed to have a waveform shape.

|0056| In certain embodiments, once a wire is bent and/or twisted to form an article with a predefined shape, the article may maintain its predefined shape, and not partially or completely return to its original shape. Additionally, prior to being bent, twisted, and/or otherwise worked in order to form an article with a desired or predetermined shape, a magnet wire may be cut to any desired length. For example, a wire may be cut to a lengih of approximately 5, 10, 15, 20, 25, 30, 35, 40, 5, 50, 55, 60, 65, 70, 75, 80, 85, 90, 5, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 800, 900, 1000. 2000, 3000, 4000, 5000 mm, a length included in a range between any two of the above values, or a lengih included in a range bounded on either a minimum or maximum end by one of the above values.

16057} A few example articles that ma be formed from sections of magnet wire are illustrated in FIGS. 4A-4D, FIG. 4A. illustrates a first example U-shape hairpin 400 that may constitute an article. The hairpin 400 may include a U-shaped end turn 405 and two legs extending from the end turn 405. FIG. 4B and 4C illustrates other example articles 420, 425 that are formed as U-shaped hairpins. .Irs contrast to the article 400 of FIG. 4A, further bends may be incorporated as desired into one or more of the leg portions of the articles 420, 425 illustrated in FIGS. 4B and 4C. FIG. 4D illustrates another example article 430 that includes one or more twisted ends that form end turns for a winding. A wide variety of other articles may be formed that include any number of bends and/or twists. The articles discussed with reference to FIGS. 4A-4D are provided^"by way of non-Umi^'ng example only. 0058} FIG. 6 illustrates a flow chart of an example method 600 for forming magnet wire thai includes at least one conformal layer, such as one or more layers containing parylene, in accordance with an illustrative embodiment of the disclosure. The method 600 may begin at block 605. At block 605, a magnet wire conductor maybe provided in accordance with, a wide variety of suitable techniques and/or utilizing a wide variety of suitable wire^■formation systems, For example, at block 610, a conductor may be drawn from a suitable input material (e.g.,. a larger diameter conductor, rod stock, etc,}. In certain .embodiments, a wire forming device may include one or more dies through wbich the input maierial is drawn in order to reduce the size of the input material to desired dimensions. Additionally, in certain embodiments, one or more flatteners and/or rollers may be used to modify the cross-sectional shape of the input material before and/or after drawing the input material through any of the dies. For example, rollers may be used to flatten one or more sides of input material in order to form a .rectangular or square wife. In other embodiment^'s, a wire forming. device may receive input materia] from a suitable continuous extrusion or conform machine. For example, a conform machine may receive rod stock (or other suitable input material) from a payoff or other source, and the conform- machine may process and/or- manipulate the rod stock to produce a desired conductor via extrusion. As another example, at block 615, a preformed conductor may be provided or received from a suitable payoff or source. In other words, a conductor may be preformed in an offline process or obtained from a supplier.

{05)59] At block 620, which may be optional in certain embodiments, base insulation ma be formed around the conductor, A..wide variety of different types of base insulation may be formed around the conductor- as desired in various embodiments. For example, -at block 625, one or more lay ers of enamel may be formed around the conductor. Irs certain embodiments, the conductor may be passed through one or more suitable dies or other components that apply a varnish to the conductor, and the conductor may then he passed through an enameling oven in order to cure the varnish and/or evaporate solvents. Its this regard, an enamel layer may be formed. The process may be repeated as desired in order to attain a desired enamel thickness and/o build._. As another example, at block 630, one or more semi-conductive layers may be formed around the conductor. In various embodiments, a semi-conductive layer may be: formed on the conductor in a similar manner -to an enamel layer or a semi-eonduetive layer may be extruded onto the conductor. As yet another example of forming base insulation, at block 630, one or more layers of extruded thermoplastic material may be formed around the conductor. Any .number of suitable devices may be configured to form an extruded layer, such as any number of suitable extrusion heads and or other devices configured to apply a desired amount of thermoplastic insulation. As desired, the flow rates of the extruded insulation -may be controlled in order to obtain a desired thickness. Additionally, in certain embodiments, one or more extrusion dies may be utilized to control the thickness and/or shape of the extruded, insulation. In certain embodiments, base insulation may include a combination of different types of materials and/or layers. For -.example, enamel may be formed over a semi-conductive layer. As another example, an extruded layer may be formed, over one. or more underlying layers. Indeed, a wide variety of suitable base insulation, structures may be utilized in accordance with various, embodiments of the disclosure,

{0060 J At block 640, a conformal layer, such as a layer containing parylene, may be formed around the conductor and, if present,^'any base insulation. As set forth, above, a wide variety of different types of materials ma be formed, for example, parylene N, parylene C, parylene D, parylene HT, or other parylene variant. Additionally, a wide variety of suitable_.methods, techniques, and/or devices may be utilized to apply a parylene-containiag layer. For example, the magnet wire may be positioned within a chamber in which vaporized parylene is permitted to form on an outer-surface. As desired, the magnet wire may be arranged in the chamber such that substantial an entire outer surface of the magnet wire is exposed to the parylene. Further, in certain embodiments, the magnet wire may be vibrated or otherwise manipulated such that all portions of the outer surface are coated. As desired, the paiyiene-eoniaming layer- may be formed with any desirable or suitable thickness, such as a thickness between approximately one μϊΤ! and approximately 40 um. In certain embodiments, as explained in greater detail below with reference to^'FIG. 7, the magnet wire may be cut and/or formed into a desired shape, such as a hairpin shape, prior to the formation of a cohformal layer.

[0061] At block 645, one or more additional conformai layers, such as one or more additional paryiens-containing layers, may^'be formed on the magnet wire. In other words, the layer formed at block 640 may be a first layer containing a first parylene material At block 645, a second layer containing -a second parylene material may be formed. As desired, a- third layer, fourth layer, and or any other number of layers may be formed in a similar manner. In certain embodiments, at least two of the layers may include different parylene materials. For example, the second layer may contain a second parylene material different than the first parylene material. Each additional parylene-containmg layers may be formed, in a similar manner as that described above with reference to block 640. Additionally, in certain embodiments, the same deposition chamber may be utilized to deposit or form a plurality of different parylene-containing layers. In other embodiments, a plurality of different chambers and/or other devices may he utilized to deposit different layers. As desired, suitable adhesion promoters or adhesion promoting layers may be formed between, two or more parylene- c ntaining layers, between a paryiene oatainmg layer and the base insulation, between a parylene-containiiig layer and the conductor, and/or between any other layers. The method may end following block 645.

[0062] FIG , 7 illustrates a flow chart of an example method 700 for forming a magnet wire article in accordance with art illustrative embodiment of the disclosure. The method 700 may begin-^'at block 70S. At block 705, a winding wire or magnet wire may be provided. The magnet wire may include a conductor and_.an optional insulation system formed around the conductor, As desired, the .insulation system may include a wide variety of suitable materials and/or layers including but not limited, to, one or more semi-conductive layers, one or more enamel layers, ofte or more extruded^' layers, and/or one or more parylene layers. A few example magnet wire constructions are described in greater detail above. jf0863] At block 710, the magnet wire may be formed into a desired shape. In other words, the magnet wire may be formed into a suitable article that may be incorporated into an appliance, soeh as a rotating electric machine (e.g., an alternator, a motor, a generator, etc), A wide variety of -different articles and/or desired shapes may be formed as desired, and a few non-limitin examples of articles are described in. greater detail above with reference to FIGS. 4A-4D. For example, at block 715, the magnet wire may he formed into one or more hairpins or other predetermined shapes for insertion into an appliance. In certain embodiments, the magnet wire may be cut into sections or portions, and each section may be bent into a hairpin or an article having at feast one bend or twist. During assembly of an appliance, the hairpins may be arranged in proximity to one another, -and connections (e.g., welded connections, etc.) may be formed as desired between the ends of various hairpins. The described hairpins, are provided by way of example only, and it will be appreciated that a wide variety of other shapes, structures, and/or other articles may be formed from magnet wire. Additionally, during the formation of -an article, the magnet wire may be cut, twisted, bent, and/or otherwise manipulated._.^'In some instances, the forces exerted on the magnet wire may result in the formation of faults, defects, and/or weakened areas within the magnet wire .insulation. In some case, portions of the magnet wire conductor may be exposed (e.g., a portion where She magnet, wire was cut, etc.).

[0064] In other embodiments, the conductor may be formed or otherwise provided with a desired shape. For example, the conductor may be cast, printed (e.g., 3-D printed, etc.), produced with additive manufacture, or otherwise formed with a desired article shape (e.g., a hairpin, etc). Base insulation .may optionally be added or formed on the conductor.

[0065] At block 725, one or more paiylene-eontaimng layers may be formed on the one or more shaped magnet wire articles to provide conformal protective coatings. In certain embodiments, the coatings may be formed in a batch process prior to the articles being- incorporated into, an electrical appliance. Additionally, as set forth in greater detail above, a wide variety of suitable ffielliods. techniques, devices, and/ or other equipment ma be utilized to form conformal layers. The method may end following block 72S.

[0066] FIG, 8 illustrates a flow chart of an example method 800 for forming an electric machine or other assembly in accordance with an illustrative embodiment of the disclosure, The method 800 may begin at block 805. At block 805, one or more winding wires, magnet wires, or magnet wire articles may be provided. For example, any number of preformed, hairpins, and/or other- articles may be provided as described in FIG. 7. At block 810, .the magnet wire or article(s) may be incorporated into a suitable appliance or assembly. For example, magnet wire articles may be positioned within one or more associated slots (e.g., stator slots, etc.} or other portions configured to receive the articles. At block 15, one or more conformal. coatings (e.g., one or more parylene-containing layers, etc.) may be formed on the. appliance or assembly. The parylene-containing layer(s) may provide protection for the magnet wire articles and/or may reduce or eliminate any faults and/or exposed conductor portions. Additionally, in certain embodiments, the par lene-contaioing layers) ma assist in holding or maintaining the .magnet wire articles in place. As set forth above, a wide variety of suitable methods, techniques, devices, and/or other equipment may be utilized to form conformal layers. The method may end following block 815.

[00671 The operations described and shown in the methods 600, 700, 800 of FIGS. 6-8 may be carried out o -performed in any suitable order as desired in various embodiments. Additionally, in certain embodiments, at least a portion of the operations may be carried out in parallel. Furthermore, in -certain embodiments, less than or more than the operations described in FIGS. 6-8 may be performed.

|0 68] -Conditional language, such as, among others, "can," "could," "might " or "may," unless specifically stated otherwise, or otherwise understood within the context as used, is generally intended to convey that certain embodiments could include, while other embodiments do not^' include, certain features, elements, and/or operations. Thus, such conditional language is hot generally intended to imply that features, elements, and/or operations are in any way required for one or more embodiments or that one. or more. embodiments necessarily include logic for deciding, with or without^' user input or prompting, whether- these features, elements, and or operations are included or are to be performed in any particular embodiment. j0069] Many modifications and other embodiments of the disclosure set forth herein will be apparent haviag the benefit of the teachings presented in. the foregoing descriptions and the ■associated drawings. Therefore,, it is to be understood that .the disclosure is not to-be limited to the specific embodiments disclosed and thai modifications- and other_.embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of_.limitation.