Electric motor with tachometer signal generator
US5717268A · kind A · utility
21Cited by
12References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1996 |
| Grant date | Feb 10, 1998 |
| Priority date | — |
| Expiry date | Jun 17, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/487
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A permanent magnet electric motor including a rotor having an annular arrangement of field magnets for rotation around an axis relative to a stator. An annular FG magnet arrangement affixed to an end of the rotor cooperates with an adjacent FG coil to produce a signal indicative of the rotor speed. A shunt washer of magnetically permeable material is interposed between the field magnet arrangement and the FG magnet arrangement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.