Sensorless rotor tracking of induction machines with asymmetrical rotor resistance
US6069467A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 16, 1998 |
| Grant date | May 30, 2000 |
| Priority date | — |
| Expiry date | Nov 16, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P2203/11
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A drive system for providing ac drive power to an induction machine with asymmetrical rotor resistance and for sensorless rotor tracking of the induction machine includes: a signal injector for determining a stator command signal in a reference frame which is aligned with either an estimated rotor reference frame; a signal determiner for determining a feedback stator signal of the induction machine in a stator reference frame; and a rotor position and velocity tracker for using the feedback stator signal to estimate a rotor velocity and position by transforming the feedback stator signal into an orthogonal axis feedback stator signal in the estimated rotor reference frame, isolating a component of the orthogonal axis feedback stator signal which is in-phase with the injected stator command signals, filtering the isolated component to isolate an error term, and generating a position estimate by driving the isolated error term towards zero. In several related embodiments a flux axis stator command signal is injected into the drive system and flux axis and torque axis stator feedback signals are then used for rotor position and velocity tracking.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.