| 摘要 |
A system for controlling the rotation of a spindle which includes motor, a speed detector 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 a deviation between the signal indicative of the actual motor speed and a command speed signal, a spindle which is driven by the motor, and an orientation control circuit for producing a position deviation signal on the basis of the rotational position of the spindle and a commanded stopping position, wherein the spindle is rotated at a commanded speed by the speed control circuit and rotationally controlled in response to an orientation command signal so as to reduce the position deviation signal to zero. The gain of the speed control circuit is raised upon detecting that the rotational position of the spindle has reached the vicinity of the commanded stopping position, whereby the spindle which comes to rest at the commanded stopping position is held at such position rigidly as if secured there by a mechanical brake. Hence the spindle will not rotate accidentally even if subjected to an external force.
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