Improvements in or relating to current controlling devices
Номер патента: GB1260192A
Опубликовано: 12-01-1972
Автор(ы):
Принадлежит: Energy Conversion Devices Inc
Опубликовано: 12-01-1972
Автор(ы):
Принадлежит: Energy Conversion Devices Inc
Реферат: 1,260,192. Solid-state switching element. ENERGY CONVERSION DEVICES Inc. 10 April, 1969 [11 April, 1968], No. 18343/69. Heading H1K. A symmetrical solid-state switching element has a semi-conductor mass consisting of boron with one or more of carbon, silicon, titanium, germanium, zironium, and hafnium. With binary boron-silicon compositions the preferred boron content is in the range 75-86 wt. per cent. The element switches from an initial very high resistance state to a low resistance state when a threshold voltage is exceeded and reverts to the high resistance state only when the current through the element is made less than a holding value. The semi-conductor may be prepared by mixing the particulate elements and fusing them together either in an arc furnace or by the use of an electron beam. Fragments of the fused material may be provided with ohmic contacts or the material may be used as a source for evaporation or sputtering. Alternatively the elements may be evaporated or sputtered on to a substrate without initial fusion. In a further variant, the fused material is ground to a powder which may be placed directly between electrodes, which may be compacted and placed between electrodes, or which may be made into a paint and applied to electrodes. Depending on the composition and/or method of preparation the material may be amorphous or crystalline. Both forms are considered to have a polymeric structure. The electrodes are of tantalum, niobium, tungsten, molybdenum, or graphite.
Synchronous motor control device
Номер патента: US20240154554A1. Автор: Kenji Takahashi,Tomohisa TSUTSUMI. Владелец: FANUC Corp. Дата публикации: 2024-05-09.