Abstract
In recent years, high rotational speed of IPM motors is required for applications like Electric Vehicle(EV). In case of rotors having same shape, maximum against centrifugal force is decided by the strength of rotor core. Therefore, it is possible to achieve higher rotational speed if higher strength steel plate, instead conventional silicon steel plate, is used. However, in case of higher strength steel plate, the efficiency of motor drops as iron loss increases due to the degradation of its electromagnetic characteristics.●br●This paper reports on the efficiency of a prototype IPM motor with rotor core that using high strength steel plates having a yield point over 3 times higher than the conventional silicon steel plates. The efficiency of the prototype IPM motor is also compared with a rotor core that uses conventional silicon steel plates. It is found that although there is small drop of motor efficiency, the prototype IPM motor achieved a maximum rotational speed which about 2times higher than that of the conventional core IPM motor.
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