逆起電力検出信号を用いたPM形ステップモータの閉ループ制御駆動

概要

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This paper describes a closed loop driving method of stepping motors by using sensed back electromotive forces (emfs). It has been known that performance of stepping motors can be improved apparently by closed loop driving method. Since one of the most important advantages of stepping motors is their low cost, the necessity of encoder to detect the position of rotor prevents wide applications of the closed loop driving method. As to PM (Permanent Magnet) stepping motors including synchronous motor origin type, back emfs generated in their stator coils give us information about velocity and position of the rotors. To do the closed loop control drive without encoder, the authors developed a new method of sensing the back emfs. In this method, the back emfs can be detected by using sensing coils which are wound around the poles of stator and a pair of small transformers which are connected in series to the sensing coils. Experimental results show that the waveforms of the sensed back emfs are good enough to perform the closed loop control drive. Fundamental study of closed loop control drive is also presented.
公益社団法人精密工学会の論文
1989-12-05