HIGH-SPEED TORQUE CONTROL OF BRUSHLESS PERMANENT-MAGNET MOTORS
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A method of converter control to improve the highspeed torque of brushless permanent magnet (PM) motors is presented. The control method consists of modulating the converter conduction intervals and their phase relative to the rotor position in order to deliver current to the stator windings at high speeds where the motor back EMF approaches the converter rating. A microprocessor-based controller is used in the implementation of this method. With this control, operation of the PM motor drive at its maximum ratings can be extended to higher speeds. 1988 IEEE