Design and optimization of axial permanent magnet machine for electric vehicle

The application of permanent magnet in electrical machines increases their efficiency by eliminating the excitation losses, which means a higher output power or torque per volume than when using electromagnetic excitation. In this paper, a drive system based on a modular structure of permanent magnet machine is proposed. The main objective is to conceive an actuator having a high starting torque, height specific power and high efficiency. Modular structure offers the possibility of power augmentation by insertion of modules. This characteristic reduces significantly the manufacturing cost. Machine structure and the proposed 2-Dmodel are presented in the first part. The second section introduces the sizing approach using generalized sizing equations. The initial calculation of motor dimensions and parameters, namely, the electric constant, slots height, permanent magnet size, and coil turns, are also presented. In the third part finite elements analysis of the structures is investigated to get an insight of field distribution, flux directions and paths in different parts of the machines for different load conditions. Furthermore, torque and cogging torque of the machine are analysed by using of finite elements method to validate analytic approach.