CONTROL OF A PERMANENT-MAGNET MOTOR

摘要

A method of controlling a permanent-magnet motor, the method comprising: sequentially exciting and freewheeling a winding of the motor, wherein the winding is free wheeled over a freewheel angle; and varying the freewheel angle in response to changes in speed of the motor. Additionally, a control system for a permanent-magnet motor, and a product incorporating the control system and motor.