Abstract
Recentely, because of the develoment of the AC motor control theories, it has become possible to control the speed and its position by using the AC synchronous motor in automation equipments. But even though “there are merits for the AC motor like a maintenace-free because of the brushless structure and so on, there still remain demerits like a high cost, the complicated control units used, much current used, not so high efficiency, etc. And so there still remain merits for using DC servo motors.So under these facts deeply considered, more simplified and costless motor control method (compaired with usual DC motors and AC motors) will be introduced theoretically and physically by using a DC servo motor and the Multi-Stages PWM method.
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