本文旨在研製無轉軸偵測元件之開關式磁阻電動機驅動系統。文中，首先介紹開關式磁阻電動機的基本原理、架構、及數學模式，接著探討無轉軸偵測元件驅動系統。本文使用二種方法估測電動機的轉速及轉軸角度：方法一利用估測電動機激磁線圈的磁通鏈，配合滑動模式觀測器，計算電動機轉速及轉軸角度；方法二使用查表法，即時運算電動機激磁線圈的磁通鏈，配合事先建立的電動機磁通鏈對電流及轉軸角度的關係表，決定激磁相位及估測轉速。

本文使用Motorola公司的32位元微電腦，以組合語言撰寫的控制程式，執行速度及電流控制，完成閉迴路控制系統，實測結果說明本文所提方法確實可行。

This thesis is concerned with the development of the sensorless switched reluctance machine drive system. First, the basic principle, structure, and mathematical model of the switched reluctance machine are introduced. Then, two sensorless techniques of the drive system for switched reluctance machines are presented. The first method estimates the flux of the machine by using a sliding-mode observer to obtain the rotor position and speed, with the second method calculates the flux of the machine, and compares it with a look-up table to determine the commutation sequences and the estimated speed.

Using a 32-bit microprocessor manufactured by Motorola Company, a digital system including the closed-loop speed controller and current controller, is implemented. The experimental results show that the proposed methods are feasible and practical.

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