System and method for determining rate of rotation using brushless DC motor
US6144198A · kind A · utility
3Cited by
8References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1998 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Jul 27, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/17
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system and method are provided for measuring rate of rotation. A brushless DC motor is rotated and produces a back electromagnetic force (emf) on each winding thereof. Each winding's back-emf is squared. The squared outputs associated with each winding are combined, with the square root being taken of such combination, to produce a DC output proportional only to the rate of rotation of the motor's shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.