由馬達作為電動輔助力的應用越來越廣泛，現今結合了自行車成為電助力腳踏車，除了節能省力更提高自行車的附加價值，然而動力模組上之核心，扭矩感測器的關鍵材料及其訊號分析技術，卻掌握於少數大廠中，亦成為國內電助自行車產業跨足國際之瓶頸。
本論文首先解析各種扭矩量測的方法，並針對市售電動輔助自行車所使用的扭矩感測器原理進行說明，最後以目前的主流逆磁致扭矩感測器，作為探討對象。
由磁性材料的逆磁致伸縮特性所製成的扭矩感測器，因機械強度高，有使用壽命長之優勢，有效地解決普遍壓力感測器因長期使用而疲勞失效等問題，並且由套筒式的機構設計下，更簡化安裝感測器的難易度，在生產流程上可簡化繁瑣的校正步驟，優化加工時程。
本文對於逆磁致效應之材料種類進行介紹與選用說明，並探討不同設計參數對於磁場輸出訊號之影響，最後實際製作一具逆磁致效應之感測器樣機；同時根據感測器激磁線圈所需要的高頻訊號，設計並製作一實體電路，可針對輸出訊號進行放大處理，驗證逆磁致感測器之特性並實現扭矩的量測。

The application of motors in power-assisted system is becoming more and more widespread. A success example is the power-assisted bicycles. It not only has advantage on energy and labor saving, but also increases the societal value of bicycles. However, the core component of the power-assisted electric module is the torque sensor whose key materials and the signal analysis circuit are controlled by few large factories. This has become a bottleneck for domestic electric bicycle manufacturers to enter or compete in the international market.
This paper analyzes various torque measurement methods and explains the principle of torque sensor used in commercially available electric assisted bicycles. However, more focus is placed on torque sensors that use inverse magnetostrictive effect.
The torque sensor which use the inverse magnetostrictive property of the magnetic material has the advantages of high mechanical strength and long service life, and effectively solves the fatigue-failure problem of the pressure sensor due to long-term use. In addition, the design of the mechanism simplifies the sensor installation and the cumbersome calibration steps in the production process thus optimizing the processing time.
This paper introduces and select the types of materials for the use of inverse magnetostrictive effect and then discuss the influence of different design parameters on the magnetic field output signal. Finally, a sensor prototype with an inverse magnetostrictive effect is actually fabricated. According to the high frequency signal required by the excitation coil of the sensor, the physical circuit is designed and fabricated. The output signal can be amplified to verify the characteristics of the inverse magnetostrictive sensor and then measure its torque.

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