Axial-air-gap type semiconductor electric motor
US4072881A · kind A · utility
Inventor
Key dates
| Filing date | Sep 17, 1976 |
| Grant date | Feb 7, 1978 |
| Priority date | — |
| Expiry date | Sep 17, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K29/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An axial-air-gap type semiconductor motor has a disc-shaped rotor, a pair of disc-shaped armatures coaxially located adjacent the opposite faces of the rotor with air-gaps therebetween, a system for detecting the rotational position of the rotor for generating an output proportional to the rotating speed of the rotor, and a semiconductor circuit operable in response to the output from the position-detecting system for controlling the armature current to effect constant-speed control of the rotation of the rotor. The rotor includes a field magnet. Two groups of armature coils are mounted on the face of each of the armature discs facing the rotor. The position-detecting system includes a control band which includes a plurality of control sections and which is synchronously rotatable with the rotor, and detectors which are located at fixed positions along the control band for generating an output in response to the control sections of the control band. The control band may be provided integrally around the periphery of the rotor. Induction coils are provided, each being affixed to the central portion of each of the armature coils. The induction coils generate a three-phase output prop…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.