本文旨在探討高功因直流無刷電動機之跑步機驅動系統的研製。文中，首先說明直流無刷電動機的結構、特性及數學模式。其次，因應跑步機寬廣的變速需求，除針對低速控制提出不同的控制方法外，並配合弱磁控制以擴展高速控速範圍。接著設計一模糊比例積分控制器應用在直流無刷電動機的速度控制，改善整體系統速度追隨及干擾斥拒的能力。最後，於電源側加入一功率因數校正電路，提升電動機運轉時輸入側電源的功率因數。本文中探討直流無刷電動機應用在跑步機驅動系統，並以數位信號處理器來達成閉迴路控制，由實測結果說明本文理論分析的正確性與可實現性。

This thesis proposes the design and implementation of a high power factor brushless DC motor drive system for running machines. In this thesis, first, the structure, characteristics, and mathematical model of the motor are discussed. Then, to fit the requirement of widely adjustable speed range, a low speed control method is proposed. In addition, a field-weakening control is used to extend the adjustable speed range. Next, a fuzzy PI controller is proposed to improve the tracking ability and load disturbance rejection capability of the drive system. Finally, a power factor correction circuit is used to improve the power factor of the input source. In this thesis, the brushless DC motor is applied to a running machine, and a digital signal processor is used to realize the a closed-loop control system. The experimental results validate the correctness and feasibility of the theoretical analysis.

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