Torque angle and peak current detector for synchronous motors
US4991429A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1989 |
| Grant date | Feb 12, 1991 |
| Priority date | — |
| Expiry date | Dec 28, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A torque angle and peak current detector for a three-phase synchronous motor utilizes a phase-locked loop to generate a digital stator field position signal phase locked to the stator current. The phases of digital -sine and cosine reference signals generated from the field position signal are compared with x and y stator current component signals in multiplying digital to analog converters to generate a phase error signal which is driven to zero with the reference signals in quadrature with the current component signals at phase lock. The reference signals are also multiplied by in-phase current component signals and the products are summed to generate the peak current signal. A digital rotor angle position generated by a resolver and an analog to digital converter is subtracted from the digital field position signal to generate the torque angle signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.