Non-intrusive speed sensing for induction motors
US6208132A · kind A · utility
7Cited by
7References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1998 |
| Grant date | Mar 27, 2001 |
| Priority date | — |
| Expiry date | Nov 2, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/487
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensing coil affixed to the outside of an induction motor housing uses flux signals from the motor to measure motor speed. In particular, components of the rotor current are measured and compared to analysis from stator fundamentals and sidebands to determine the true rotor frequency which can then be used to determine the motor speed. A shield and/or a compensating coil can optionally be used to filter out extraneous signal noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.