Induction motor control system
US6828751B2 · kind B2 · utility
54Cited by
3References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2003 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Sep 30, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P27/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An induction motor drive system and method estimates a motor power factor based on the AC power output to the motor phase windings and estimates the rotor speed based on the estimated power factor. The estimated rotor speed is compared to a rotor speed command signal to generate a speed error, and the voltage and frequency input to the motor are adjusted in response to the speed error. Rotor speed is estimated based on estimated rotor slip, which is estimated based on the applied voltage, frequency, estimated power factor and estimated motor power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.