Electric motor having frequency generator
US4109170A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 19, 1976 |
| Grant date | Aug 22, 1978 |
| Priority date | — |
| Expiry date | Oct 19, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/465
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric motor having a rotor consisting of a disk-shaped multi-polar magnet circumferentially sectioned to have a plurality of magnetic poles, a stator consisting of a pair of superimposed star-shaped flat driving coils, said driving coils being disposed facing said magnet, said driving coils being arranged to be supplied with respective alternating currents having a phase differential of 90.degree. thereby to drive the disk-shaped magnet, said motor further comprising a speed detecting coil having a plurality of radially disposed generating wire elements, said generating wire elements being disposed within a magnetic field of said magnet and being connected in series, whereby a signal having a frequency corresponding to the revolution speed of said disk-shaped magnet is induced in said speed detecting coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.