Closed loop torque angle control of synchronous motor
US4884016A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 1988 |
| Grant date | Nov 28, 1989 |
| Priority date | — |
| Expiry date | Aug 23, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A closed loop motor system having a motor with a plurality of poles and motor windings associated therewith. The poles define full step motor output positions. The system is of the type that assigns intermediated current values to the motor windings for fine step positions of the motor. The system also comprises a motor output position encoder for generating an integral and fixed number of encoder pulses as the motor moves between any two motor poles. The pulses are equally spaced and at least some corresponding to the fine step positions. An initializing current comprising components for applying full step current values to motor windings for a time interval in which the motor output is assumed to align with a full step position, and components for zeroing the count in the counter and assigning the torque angle value, whereby the encoder does not require alignment relative to the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.