STARTING AND SYNCHRONIZATION OF PERMANENT-MAGNET HYSTERESIS MOTORS

This paper presents the design, analysis, and application of permanent magnets in the hysteresis motor with a view to improve the overall pe rformances of such motor. The novel rotor consists of 36% cobalt steel alloys with neodymium boron iron permanent magnets. This hybrid desig n combines advantageous performance features of both the typical perma nent magnet motors and the conventional hysteresis motors. The machine models for steady-state and run-up performances are derived. Using st ate variable equations, starting and synchronizing performances are pr edicted. A 5-hp laboratory prototype permanent magnet hysteresis mater was built. Test results validate the superior performances of the new motor.