本文旨在研製六相埋入型永磁式同步電動機電流控制策略。在電流閉迴路控制方面，採用單組qd軸模式、雙組qd軸模式、共模及差模模式的電流控制，其中單組qd軸模式控制較為簡單，但會造成abc繞組與xyz繞組相電流不平衡。雙組qd軸模式能夠解決相電流不平衡的問題，但對於降低相電流諧波含量的效果不足，故本文最後採用共模及差模模式，以降低相電流諧波含量及轉矩抖動，提升六相永磁同步電動機的性能。
本文採用Matlab/Simulink軟體模擬雙組三相變頻器及六相埋入型永磁式同步電動機的轉速及電流閉迴路控制，以驗證本文控制策略的可行性。轉速及電流閉迴路控制策略的實測，在轉速為2400 rpm、機械轉矩為5.46 N-m的情況下，雙組qd軸模式電流控制，將原本a相相電流峰值29.02 A、x相相電流峰值25.74 A不平衡的情況改善為a相相電流峰值26.4 A、x相相電流峰值26.32 A。共模及差模模式電流控制，將a相相電流諧波含量8.19 %、x相相電流諧波含量8.6 %，降低至將a相相電流諧波含量4.8 %、x相相電流諧波含量5.06 %，轉矩抖動0.23 N-m減少至0.1 N-m。六相永磁同步電動機效率從85.3 %提升至88 %。

This paper aims to develop a current control strategy for a six-phase interior type permanent-magnet synchronous motor. In terms of current closed-loop control, single-set qd-axis mode, dual-set qd-axis mode, common and differential-mode current control strategies are employed. Among them, the single-set qd-axis mode control is relatively simple but can cause imbalance in the abc windings and xyz windings' phase currents. The dual-set qd-axis mode can solve the problem of phase current imbalance, but it is not effective in reducing the harmonic content of the phase currents. Therefore, this paper ultimately adopts the common mode and differential mode strategies to reduce the harmonic content of the phase currents and torque ripple, thereby improving the performance of the six-phase permanent magnet synchronous motor.
This paper uses Matlab/Simulink software to simulate the speed and current closed-loop control of dual-group three-phase inverters and six-phase interior type permanent-magnet synchronous motors to verify the feasibility of the control strategy in this paper. The actual measurement of single-set qd-axis mode current control strategy shows that when the speed is 2400 rpm and the mechanical torque is 5.46 N-m, the current peak value of the original a-phase phase current is 29.02 A, and the peak value of the x-phase phase current is 25.74 A. Using the two-set qd-axis mode current control,the unbalanced situation is improved to a phase current peak value of 26.4 A and phase x phase current peak value of 26.32 A. Common mode and differential mode current control, reducing the harmonic content of phase a phase current from 8.19% and x phase current harmonic content to 8.6% to reduce the harmonic content of phase a phase current to 4.8% and phase x phase current harmonic content 5.06%, and the torque jitter was reduced from 0.23 N-m to 0.1 N-m. The efficiency of the six-phase permanent magnet synchronous motor is increased from 85.3% to 88%.

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