本論文針對具有非正弦反電動勢之表面型永磁馬達進行轉矩漣波抑制研究，以改善其高轉矩漣波之缺點。藉由分析馬達轉矩漣波及反電動勢諧波之關係，提出諧波電流控制方式，並推導同步旋轉座標與電流諧波之關係，求得考量電流諧波之同步旋轉座標，以輸出合適之電流波形有效抑制永磁馬達轉矩漣波。
文中利用ANSYS-Maxwell及Twin Builder建立馬達有限元素分析模型，模擬馬達之操作情形，以驗證控制器作動訊號。且將上述所提出之同步旋轉座標應用於磁場導向控制，利用有限元素分析模擬馬達磁路，以降階模型(Reduced Order Modeling)方式製作其等效電路模型，並使用MATLAB Simulink模擬驅動電路及馬達動作，驗證本文同步旋轉座標在任何操作條件下，馬達皆有較小轉矩漣波。藉由本方法之應用，可使永磁馬達無需具備正弦波反電動勢即可有效抑制轉矩漣波，如此可降低馬達製造成本並減少磁石廢料。

In this thesis, the torque ripple reduction research on surface permanent magnet (SPM) Motor with non-sinusoidal back electromotive force is carried out to improve the shortcomings of high torque ripple. By analyzing the relation between the motor torque ripple and the back-EMF harmonics, the harmonic current control method is then proposed. This thesis derives the relation between rotor synchronous reference frame and current harmonics, and obtains the improved rotor synchronous reference frame considering current harmonics to output the appropriate current. The current waveform effectively reduces the torque ripple of the permanent magnet motor.
In this thesis, ANSYS-Maxwell and Twin Builder are used to establish a finite element analysis model of the motor to simulate the operation of the motor to verify the operating signal of the controller. The above-mentioned rotor synchronous reference frame is applied to field oriented control (FOC), which manages to use finite element analysis to simulate the magnetic circuit of the motor, make its equivalent circuit model in the reduced order modeling (ROM), and use MATLAB Simulink to simulate the drive circuit and motor action to verify that the rotor synchronous reference frame of this thesis has low torque ripple under any operating conditions. Through the application of this method, the permanent magnet motor can effectively reduce the torque ripple without the need of a sine wave back-EMF; in this case, the manufacturing cost of the motor can be reduced and so can magnet waste.

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