摘要
　　本文旨在研製配合燃油式引擎汽車冷氣壓縮機使用之三相永磁式同步電機及其驅動系統，俾分別在電動機模式操作以驅動壓縮機負載，以及發電機模式操作對蓄電池充電。本研究使用有限元素分析軟體Maxwell/2D分析永磁式同步電機，決定繞組匝數及線徑以配合低壓之使用場合。文中之雙向功率轉換器採用三相三臂型換流器以驅動三相永磁式同步電機，並採用電壓空間向量脈波寬調變、電流閉迴路與轉速閉迴路控制策略，以提高轉速響應、降低電流總諧波失真率及增進系統效率。另外，本文採用線性霍爾效應偵測元件的信號回授電機角位置及作轉速估測，此不僅具有絕對位置偵測、提高解析度，亦能節省成本。在蓄電池充電部分採用二段式充電，且可依據蓄電池規格之不同修改程式，不僅達到蓄電池的快速充電，亦有低交流端電流諧波之性能。
　　三相永磁式同步電機在發電機模式於轉速為2000 rpm的感應電動勢相電壓峰值分析結果為9.84 V，總諧波失真率為0.77 %，其對應的實測值為9.42 V及1.69 %，二者相當接近。在雙向驅動系統方面，本文採用32位元之數位信號處理器TMS320F28069作為控制核心，其控制策略大都由軟體程式執行。在電動機模式操作下，直流鏈輸入電壓24 V，在轉速為2000 rpm，加入機械負載的功率為300 W時，電動機的相電流峰值為32.7 A，相電流的總諧波失真率為1.87 %，系統效率達83.8 %。在發電機模式下，原動機轉速為2000 rpm，直流鏈電壓命令為30 V，定電壓模式充電電壓為27.6 V，發電機相電流總諧波失真率為6.95 %，定電流模式充電電流為5.44 A，發電機相電流總諧波失真率為5.38 %，系統效率達78 %。由以上之實測結果驗證本文系統之可行性。

Abstract
　　This thesis focuses on the design of three-phase permanent-magnet synchronous machine (PMSM) drive system, which can operate not only in motor mode to drive air compressor, but also in generator mode to charge the battery. Finite element analysis (FEA) software Maxwell/2D package are used to find the winding turns and wire diameter of PMSM for low operating voltage environment. Three-phase three-leg power inverter is proposed to drive the three-phase PMSM. Voltage space vector pulse-width modulation as well as current and speed closed-loop controls are introduced to obtain fast response with low total harmonic distortion of current and better efficiency. In addition, linear Hall-effect sensors are used to detect the rotor position and rotational speed to yield absolute rotor position and high resolution with low cost. Meanwhile, two-stage charging and its software program are provided for batteries with different specifications to result in fast battery charging and low THD of generator current.
　　The results of FEA give the no-load voltage of 9.84 V and its THD of 0.77 % for PMSM under generator mode at 2000 rpm. The corresponding experimental results are 9.42 V and 1.69 %, respectively. Close agreement between the analysis and measured results are observed. As for the bidirectional drive system, the 32-bit digital signal processor, TMS320F28069, is adopted as the control core. Most of the control strategy is accomplished by software program. When the machine is operated in motor mode under 24 V dc-bus voltage, 2000 rpm and 300 W load, the peak motor phase current is 32.7A, the THD of motor phase current is 1.87 % with overall efficiency of 83.8 %. While when the machine is operated under generator mode at 2000 rpm and 30 V dc-bus voltage, the charging voltage in constant voltage mode and the THD of generator phase current are 27.6 V and 6.95 %, respectively. Under the same condition, the charging current in constant current mode and the THD of generator phase current are 5.44 A and 5.38 %, respectively. The overall efficiency in generator mode is 78 %. The feasibility of the proposed system is verified experimentally.

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