Control system for synchronous brushless motors utilizing torque angle control
US4490661A · kind A · utility
43Cited by
6References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1983 |
| Grant date | Dec 25, 1984 |
| Priority date | — |
| Expiry date | Jul 28, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In an improved motor control system for a pulse width modulated synchronous brushless motor, means for adaptively controlling the "torque angle", i.e. the angle between the rotating magnetic field created by the stator windings and the rotor field created by the permanent magnets on the rotor, is provided. The relationship between the two magnetic fields is controlled as a function of load and speed to provide the optimum operating point at all times. Controlling the torque angle effectively varies the back EMF constant K.sub.e (V/RPM), and the torque constant K.sub.+ (torque/ampere) of the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.