Design and Development of 50 kW Interior Permanent Magnet Synchronous Motor for Electric Vehicles
Date Issued
2008
Date
2008
Author(s)
Jan, Hsun-Hao
Abstract
In this thesis, an attempt is made to design a 50 kW traction motor which is used for propelling the electric vehicle (Colt Plus EV) of the China Motor Corporation (CMC). On the basis of the dynamic demand for driving the EV, we can decide the traction motor specifications for different rotational speeds. A preliminary design determined the motor type, winding type, and the number of slots and poles. Afterward, the following design process is proposed. First, a 2-D magnetic circuit model for Interior Permanent Magnet (IPM) motors is constructed by using the motor design equations. By combining the model with the Multifunction Optimization System Tool (MOST), the values of the design variables satisfying the optimal value of the output torque, torque ripple, weight, and efficiency are obtained. Second, the design results of the 2-D model are verified by using Finite Element Analysis (FEA) design tools. By changing the rotor geometry, the reluctance torque of the IPM motor can be improved. In order to increase the speed range of the designed motor, an electronic gearshift is employed. Besides, the field-weakening control that is implemented by leading the input current phase further increases the motor speed. Finally, with the aid of the result of thermal analysis and by employing the cooling system design, the motor is operated in the safe temperature region.
Subjects
Electric vehicles
IPM
Motor design
Type
thesis
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