本文提出低成本的電動手工具轉矩控制及估測的研製。此系統不需使用轉矩感測器及霍爾電流檢知器，僅需使用電阻測量直流無刷電動機通過的電流，即可估測電動手工具的輸出轉矩。文中以比例-積分控制器作為驅動系統的電流控制器，達成有效的螺絲鎖付。此外，所研製系統具有設定轉矩命令及顯示估測轉矩的功能。
本文使用德州儀器公司所開發的TMS320F2808數位信號處理器作為控制核心，達成電流控制器、轉矩估測，以及螺絲鎖付方法。實驗結果說明本文所提方法的可行性及正確性。

This thesis proposes a low-cost torque control and estimation for an electric hand tool. Resistances are used to estimate the output torque of the electric hand tool, but no torque sensor or Hall current sensor is required. A PI controller is used to achieve the goal of screwing the objects tightly. In addition, the implemented system provide the functions of setting torque command and display the estimated torque as well.
A digital signal processor, TMS320F2808, is used as a control center to execute the current control algorithm, torque estimating algorithm, and screwing the objects. Experimental results validated the correctness and feasibility of the proposed method.

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