10-07-2014 дата публикации
Номер: US20140191603A1
Принадлежит:
JMW CO., LTD.
Provided is a BLDC motor for a hair dryer, which includes a sintered bearing to guide rotation of a shaft, instead of using a typical ball bearing. Thus, a rotation shaft is held by fluid dynamic pressure generated by rotation of the BLDC motor, thereby decreasing vibration and noise. 1. A brushless direct current (BLDC) motor for a hair dryer , comprising:{'b': 20', '21', '22', '23', '20', '10', '20, 'a rotor housing () having a shaft hole (), in which a shaft () is inserted, in a central portion thereof, wherein a permanent magnet () is disposed in the rotor housing (), and a blower fan () for generating wind is coupled to an upper portion of the rotor housing ();'}{'b': 30', '22', '20, 'a rotor frame () having an inner circumference integrally coupled to an upper end of the shaft (), and an outer circumference coupled to the rotor housing ();'}{'b': 40', '41', '41', '23, 'a stator core () around which a coil () is wound, wherein the coil () generates torque by interacting with a magnetic field formed from the permanent magnet ();'}{'b': 50', '40, 'a printed circuit board (PCB) () coupled to a lower portion of the stator core ();'}{'b': 70', '40', '40, 'a base bracket () coupled to the lower portion of the stator core () to support the stator core (); and'}{'b': 70', '70', '60', '22, 'a bearing support (′) disposed in a central portion of the base bracket (), and supporting a bearing () for supporting the shaft (),'}{'b': '60', 'wherein the bearing () comprises a sintered bearing,'}{'b': 71', '73', '70', '22, 'a lower bearing cap () and a thrust washer () are disposed under the bearing support (′) to control a reference position of the shaft (),'}{'b': 72', '70', '60', '60, 'an upper bearing cap () is disposed above the bearing support (′) to prevent discharge of oil from the bearing () and removal of the bearing (), and'}{'b': 20', '20', '40, 'i': 'a', 'a heat discharge hole () is disposed in a top of the rotor housing () to discharge heat from the stator core ...
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