Influence of rotor structure on performance of permanent magnet assisted synchronous reluctance motor

The permanent magnet (PM) motor using the rare-earth PM is high performance. However, since these types of permanent magnets are expensive, less amount of magnet must be used to reduce costs or rare earth is not used. In the present paper, the performance of permanent magnet assisted synchronous reluctance motors (PMASynRMs) with ferrite magnets are examined. The suitable number of poles for high torque and high power performance for a PMASynRM and demagnetization characteristics of the PM are investigated. The rotor design that reduces the demagnetization effect is also clarified.