Analysis of an universal permanent magnet brushless motor drive

Abstract

A new high performance brushless permanent magnet (PM) motor operating both as a synchronous and d.c. shunt motor has been presented. The motor has been designed using a classical approach with synchronous teacLances obtained from the finite element method (FEM). For the load angle close to 90' the motor can be switched automatically from a.c. to d.c. mode. The complete integrated drive system consists of two parts: (1) motor with position sensors and (2) IGBT inverter together with control circuitry. The mode switching control strategy, operation, and performance have been discussed.h'eywmdsPermanent magnet motors. High performance universal motors. Integrated drives. r, '