磁阻馬達具有結構簡單、低成本、容錯能力和可調速度的彈性。因為磁阻馬達的凸極結構，因此需要得知馬達轉子角度來進行正確換相控制來產生最大的力矩，但通常感測器例如編碼器通常被安裝在馬達轉軸上，如此會增加系統的成本、額外的空間和降低可靠度，不適用於惡劣的環境中，因此發展出無轉軸偵測元件的控制方法。本論文旨在提出一個診斷電壓脈衝的改良式無感測器驅動方法於外轉式磁阻馬達，診斷電壓脈衝法使用診斷電壓脈衝於磁阻馬達的非激磁相，藉由轉子轉動而造成馬達電感的變化，脈衝電壓所產生的偵測電流也會隨之改變，依據偵測電流的電流值可推估出馬達轉子的位置。但因為馬達的電感變化不明顯導致偵測電流的變化不大，如有干擾影響會導致此無感測器驅動方法失敗，因此提出改良式的診斷電壓脈衝法使偵測電流變化明顯已達到轉子位置估測的目的。本文首先介紹一般的切換磁阻馬達和外轉式切換磁阻馬達之結構、特性、動作原理與數學模型，然用利用改良式的診斷電壓脈衝法位置估測做為馬達換相控制的依據。
　　本實驗架構使用具有浮點運算之32位元數位訊號處理器T.I. TMS320VC33 DSP來實現系統，並在控制器中加入改良式的診斷電壓脈衝法來估測位置，最後由模擬和實驗來驗證本文所提出的無轉軸偵測元件控制之可行性。

　　The switched reluctance motors have been received more attention over the last two decades due to the advantage over other electronics motors such as simple construction, cost, fault-tolerant operation ability and flexibility of speed adjustment. Because of the structure of the SRM, the current reference of the SRM is dependent on turn-on and turn-off angle to maximize the torque. Therefore, the control of the SRM needs the knowledge of the shaft angle to generate the current command. But the shaft position sensors or encoders for shaft position information would produce the problem of additional cost, more space requirement and unreliability of inherent source. Therefore, the sensorless control system is developed extensively to eliminate the sensors. The thesis presents an improved impressed diagnostic pulse voltage method to estimate the rotor position of switched reluctance motor (SRM) with external rotor. The fundamental method of impressed diagnostic pulse voltage is to impress pulse voltage at the inactive phases of the SRM with external rotor. Because the variations of inductance are dependent on the rotor position and the characteristic current values produced from pulse voltage are dependent on the inductance, the rotor position can be inferred by observing the characteristic current value. If the inductance of the SRM doesn’t vary obviously, the characteristic current with noise influence may not provide correct information to result the failure of the sensorless position estimation method. Therefore, an improved impressed diagnostic pulse voltage method is presented to increase the variations of characteristic current and estimate rotor position. First, the structure, characteristic, operational principle and mathematical model of the SRM with external rotor are introduced. Then the improved impressed diagnostic pulse voltage method is utilized to implement the sensorless position estimation for commutation control.
　　The structure of the experiment utilizes the digital signal processor T.I. TMS320VC33 DSP to implement the improved impressed diagnostic pulse voltage method. Both simulation and experiment results demonstrate the feasibility of the sensorless position estimation method.

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