| 摘要 |
A system for controlling the rotation of a spindle includes a motor, a speed detecting circuit for detecting the speed of the motor and for producing a signal indicative of the actual speed thereof, a speed control circuit for controlling the motor so as to narrow to zero a deviation between the actual speed thereof and a commanded speed, a spindle driven by the motor, and a position control circuit for producing a position deviation signal on the basis of a commanded stopping position and the rotational position of the spindle. The spindle is rotated at a commanded speed by the speed control circuit and is rotationally controlled by an orientation command signal so as to make the position deviation signal zero. The system further includes a proximity switch, which is mounted on the spindle, for detecting the present rotational position thereof, and for producing a detection signal having a value of zero volts when a predetermined point on the spindle has reached a commanded stopping position, and either a positive or negative value depending upon whether the predetermined point on the spindle is immediately to the left or right of the commanded stopping position. The detection signal from the proximity switch serves as the position deviation signal.
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