本研究採用永磁式同步馬達之扭矩控制結合模糊滑動轉速控制器，以模擬電動起子之機械式扭矩離合器的扭矩限制功能，並完成一套用於電動起子之的轉速與扭矩限制永磁同步馬達驅動系統。本文將設計永磁同步馬達驅動系統，硬體部分是以數位信號處理器(TI TMS320LF2407A)為控制核心，微處理器(MSP430)為人機介面，結合三相變頻器、絕對型旋轉編碼器及電流偵測積體電路元件所完成之驅動系統。軟體程式方面含有扭矩控制策略，限制電磁扭矩輸出，並設計模糊滑動控制器用於轉速估測，以及轉速及電流閉迴路控制；藉此模擬電動起子之扭矩跳脫動作控制策略。

本論文以直流鏈電壓為24V、額定功率30W之永磁式同步馬達驅動系統，在200rpm/1.0kgf．cm、500 rpm /1.0kgf．cm和1000 rpm /1.0kgf．cm設定狀況下，所表現的鎖附扭矩限制功能，並附上實驗結果，以驗證永磁式同步馬達之扭矩控制取代機械式扭矩離合器的扭矩限制功能的可行性。

This research adopts the torque control strategy of the permanent-magnet synchronous motor and combine fuzzy sliding rotational speed controller to limit the motor torque output which imitates the machinery type torque clutch of an electronic screwdriver. This thesis text will design the driver system for permanent-magnet synchronous motor. This system hardware is integrated by the control system with a core Digit signal processor (TI TMS320LF2407A), a Microprocessor (MSP430) is used in human interface, combine three-phase frequency converter, absolute type rotary encoder and integrated circuit type current sensor. The software contains the torque control strategy, restrains the electromagnetic torque output, and it design a fuzzy sliding control strategy for rotational speed and current close loop, to simulated the clutch escape function of electronic screwdriver.

The permanent-magnet synchronous motor that this thesis regards voltage of the direct current chain as 24V, rated power is 30W, set up under the state in 200rpm / 1.0kgf．cm, 500 rpm /1.0kgf．cm and 1000 rpm /1.0kgf．cm, the result displayed locking the screw and torque limit function, enclose the experimental result, in order to prove the torque limit control function of the permanent magnetism type synchronous motor is possible to replace machinery type torque clutch function.

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