| Summary: | 碩士 === 逢甲大學 === 電機工程學系 === 103 === The purpose of this thesis is to present a brushless surface-mounted permanent-magnet (SPM) motor with minimized usage of magnet for electric vehicle applications. The output power is 5 kW at rated speed of 1,350 rpm. First, the performance characteristics of integral-slot motor between three different rotor pole and stator slot combinations of 4/12, 4/24 and 6/18 combinations are analyzed by the magnetic circuit design software. Then, the finite element method is conducted to obtain the results and compare the characteristics between the different split ratios. Based on the results, 4/12 with the split ratio of 0.55 is selected for the study. The method that is used to reduce use of magnets is based on calculating the no-load flux linkage in the stator winding in terms of a volume integral applied to the volume of the magnets inside the motor. Finally, a genetic algorithm with the finite element analysis is employed to optimize the stator structure and the whole motor to minimize usage of magnet, high efficiency, and keep torque with minimize the level of torque ripple.
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