ABSTRACT
The operation ranges of internal combustion engine (ICEs) are limited compared with electric motors. To cover wide speed range, the use of clutch and transmission gear box is necessary. Induction motors, being very rugged and inexpensive, are considered as propulsion motors for electric vehicles (EVs). But the overall efficiency is low compared with permanent magnet synchronous motors (PMSMs). Since PMs are inserted in the cavities of the rotor core, no fixation device is necessary in Interior permanent-magnet synchronous motor (IPMSMs). The PM flux is valid for torque production when it makes a flux linking with the stator windings. The foremost advantage of IPMSM is the capability of utilizing reluctance torque. Variable reluctance motors utilize purely the reluctance torque. Since expensive PMs are unnecessary, reluctance motors were favored as a candidate for EV traction motors.
