本文提出依照電流變化進行電動手工具機操作模式調整之方法，藉由監控與分析，歸納整合出電流大小與輸出轉矩之間的關係，設計一套電動手工具機的輸出轉矩判斷與電動機轉速之控制系統，經由回
授電流之變化即時判斷輸出轉矩大小，以確保螺絲鎖付之準確性。目前業界有精確轉矩控制的需求時，通常使用扭力環或離合器等機械結構調整輸出轉矩，容易產生輸出轉矩精細度不足與機械磨損而造成精
確度下降等缺點。因此本文提出之方法可改善上述缺點並減少機械結構體積以及提高輸出轉矩的準確度和精細度。
傳統電動手工具機操作於單一高轉速的情況，雖過程快速，但會有扭力值不固定、材料產生形變等問題；故本研究以第二段鎖付為研究重點，在螺絲鎖付至平台時，進行慢擰之動作，以確保螺栓鎖付固定且緊密，符合精確扭力控制之需求。
本文設計一個兩段式直流無刷電動機之驅控系統，硬體架構以數位訊號處理器(TMS320F28335)與電動機驅控整合板為主要架構核心，搭配電流感測元件(ACS712)、燈號等周邊硬體；電動機控制策略為兩
段式轉速電流閉迴路，且以電流做為輸出轉矩的判斷依據。實驗結果驗證，本文所提出之根據電流大小對應輸出轉矩與兩段式轉速電流閉迴路的控制策略是可靠的。實驗證明當到達設定扭力時需進行兩段轉
速調整之電流計算值與實際電流之最大百分比誤差為 1.79%，符合業界對於轉矩精確度要求的誤差範圍±3%；轉速回授值與實測相符，最大誤差百分比僅為 1.3%之常規誤差範圍內。由此證實，本文所提出之控制系統應用於具有精確轉矩需求之場合，有高度的實用性。

According to the current change, the thesis proposed a methodology to control the operation mode of an electric screwdriver. By monitoring and analyzing the relationship between current and torque; further, designing a control system of output torque judgments and motor speed of an electric screwdriver. The speed control system judges the output torque instantly through the change of the feedback current to ensure the accuracy of screw locking. At present, when there is a demand for precise torque control in the industry mechanical structures such as torsion rings or clutches are usually used to adjust the output torque, which is prone to shortcomings such as insufficient output torque precision and mechanical wear, resulting in decreased accuracy and having a negative effect for precise torque control in the industry. Therefore, the method proposed in this paper can improve the above shortcomings, reduce the volume of the mechanical structure, and improve the accuracy and fineness of the output torque.
The traditional electric screwdriver is operated at a single high speed to lock the bolt to the end. Although the processes are fast, there still exist some problems such as the torque value, which is uncertain so that the material may be deformed. Therefore, this thesis aims to investigate the second stage of locking bolt, which is a slow twisting process. In this period, it can be locked into the platform to ensure the screw is tight to meet the demand of precise torque control.
The two-stage brushless DC motor control system has been designed. The hardware structure is based on the DSP (TMS320F28335) and the motor drive control integration board as the main architecture core, which is also coordinated with the peripheral hardware such as the current sensor (ACS712) and the light signal. The motor control strategy is two-stage speed and current closed loop, and used current as the basis for judging output torque. The experimental results proved that the proposed control strategy about two-stage speed and current closed loop control and
corresponding to the output torque according to the current is reliable. The maximum percentage error between the calculated current and the actual current is 1.79%, conform the industry’s torque accuracy range ±3%, and the maximum percentage error between the feedback speed and the measured speed is only 1.6%. Thus, the proposed control system has proven to be highly practical for applications with precise torque requirements.

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