Brushless DC tachometer circuit
US4088943A · kind A · utility
13Cited by
2References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 25, 1977 |
| Grant date | May 9, 1978 |
| Priority date | — |
| Expiry date | Feb 25, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/4805
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A brushless tachometer utilizing four stator windings and series connected field effect transistor commutation switches to provide an input to a summing amplifier. Connection of the field effect transistor switches to the summing junction of the amplifier and use of series resistance and back-to-back clamping diodes on the winding side of the field effect transistors permits commutation switching with a minimum of transient voltage changes due to interruption of the stator winding current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.