Semiconductor electric motor having a rotary transformer to excite a rotor
US4612486A · kind A · utility
Inventors
Key dates
| Filing date | Apr 19, 1985 |
| Grant date | Sep 16, 1986 |
| Priority date | — |
| Expiry date | Apr 19, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K19/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A semiconductor electric motor is disclosed which comprises: an outer housing; a cylindrical magnetic core fixedly mounted to the inside of the outer housing; polyphase armature coils mounted upon the magnetic core; a rotative shaft rotatably held by bearings mounted upon the outer housing; a rotor which is fixed to the rotative shaft and which is excited by exciting coils mounted thereon in such a way that the outer surface is polarized south and north at regular intervals and that the produced magnetic field penetrates through the armature coils; a first core made from a magnetic material and centrally provided with a hole which is made stationary relative to the rotative shaft extending through the hole; a second core made from a magnetic material and fixed inside the outer housing; the first and second cores cooperating with secondary and primary coils respectively mounted upon the first and second cores to constitute a rotary transformer; an RF oscillator consisting of a semiconductor circuit and acting to supply RF alternating current to the primary coil; an electric circuit for rectifying the output from the secondary coil and supplying it to the exciting coils; and an elect…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.