Sensorless rotor velocity estimation for induction motors
US5729113A · kind A · utility
50Cited by
9References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1997 |
| Grant date | Mar 17, 1998 |
| Priority date | — |
| Expiry date | Jan 21, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P21/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for estimating rotor shaft velocity includes adding two counter rotating signal components to a fundamental motor control signal to provide a combined control signal; sensing at least one motor phase signal; determining an extracted portion of the motor phase signal representative of the two counter rotating signal components; and using the extracted portion to estimate rotor shaft velocity. The step of adding two counter rotating signal components may include either adding a single phase signal in a reference frame synchronous to the fundamental motor control signal or adding two separate signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.