In this paper, permanent magnet assisted synchronous reluctance motor (PMa-synRM) is designed for electric vehicle propulsion system. Synchronous reluctance motor (synRM) does not contains magnet, so that the cost of the motor remains low even the price of the rare-earth magnet increases dramatically. Moreover, it has advantage on high power density due to its structure and thermal robustness owing to low losses at the rotor unlike induction motor or wound rotor type motor. However, synRM could not operate wide operating region since motor does not produce field flux by magnet or wound coil. PMa-synRM is one of the solutions for synRM to operate in wide range. Most of the PMa-synRM is considered to use ferrite magnet, since it is alternative for the rare-earth magnet motor. Currently price of the rare-magnet is not much higher than ferrite with much higher performance. Therefore, ferrite and the rare-earth magnet are both considered to design PMa-synRM and the of the both magnet model are compared in this research. Optimization on position and the magnetized direction of the magnet is conducted for each model to have best performance. Secondly, demagnetization possibility is considered at design stage. Since PMa-synRM uses limited amount of magnet, it is very vulnerable to demagnetization. Therefore, design considering magnet not to be demagnetized is conducted. Demagnetization simulation is conducted with numerical analysis based on finite element method. Lastly, torque versus speed curve is calculated to prove the operating region is widen. PMa-synRM is compared with synRM to prove its development of the performance and with the other type of motor, such as induction and wound type motor to validate its compatibility..
|Submitters Country||Republic of Korea|