本文旨在研製具電流諧波改善之三相永磁式同步電動機位置控制系統。文中採用三相三臂型變頻器以驅動三相永磁式同步電動機，使用電壓空間向量脈波寬調變，以提升直流鏈電壓之利用率。位置及轉速的回授，採解角器搭配解角電路，不僅可偵測絕對位置，亦提高回授訊號之解析度。至於電流諧波改善，則提出將感應電動勢作快速傅立葉分析得其諧波含量，將之轉換至旋轉座標系統之交、直軸上，再以電流控制器加以改善。而在位置閉迴路控制系統方面，本文提出可調式比例增益之位置調節器，在相同位置暫態響應時間下，可降低其位置穩態誤差。
在穩態時，使用直軸電流以鎖住轉子，使位置的響應不受回授元件的雜訊影響，而造成轉子抖動。另者，本文亦提出穩態抗干擾控制策略，即在外界干擾量施加於電動機時，能快速產生抵抗外力的電磁轉矩，且在外力消失時，不產生位置的超越量，以提升系統的抗干擾能力。
本文之驅動系統採用32位元數位信號處理器TMS320F28069作為控制核心，其控制策略皆以軟體實現，故可減少電路元件，提高可靠度。電流諧波改善控制之實測結果顯示，三相電流總諧波失真率從5.30 %降至2.31 %，電磁轉矩漣波由15.28 %降至5.98 %。而由位置閉迴路控制系統之實測知，可調式比例增益之位置調節器使位置穩態誤差由 降至 。實測結果驗證了本文方法具可行性。

The thesis focuses on the development of position control system for three-phase permanent-magnet synchronous motor (PMSM) with reduced current harmonics strategy. A three-leg three-phase inverter is adopted as the driving circuit of three-phase PMSM. Voltage space vector pulse-width modulation method is used for increasing the utility ratio of dc-link voltage. As for the feedback of the rotor positions and rotational speed, the resolver and resolver to digital converter, which not only detect the absolute position of the rotor, but also improve the resolution of feedback signals are used. Whereas, for the current harmonics mitigation control, fast fourier transform is introduced for analyzing the harmonic distortion of back electro-motive-force (EMF). Through transferring harmonic components of back EMF to quadrature- and direct-axis, and compensating them with current controllers, the harmonic distortion of current can be improved. In addition, position controller of adjustable proportional gain which can reduce the steady-state error of position in the same response time is proposed.
In the steady state, the direct-axis current is used for locking rotor. This can stop the response of position from being affected by noise of feedback elements to cause rotor vibration. Additionally, An anti-interference control strategy is proposed to yield electromagnetic torque instantaneously to resist disturbing forces exerted on the rotor, resulting in no position overshoot in the steady state, thereby enhancing the interference immunity of the system.
The 32-bit digital signal processor, TMS320F28069, is adopted as the control core. The control strategy is completed by software program for cost reduction and reliability enhancement. The experimental results of current harmonics mitigation control show that the total harmonic distortion of three phase current is reduced from 5.30% to 2.31%, The corresponding torque ripple is reduced from 15.28% to 5.98%. Whereas, the experimental results of position closed-loop control system indicate that properly adjusting the proportional gain of position controller reduces the steady-state error of position from to . In conclusion, the feasibility of the proposed control strategy has been verified by the experimental results.

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