| 摘要 |
<p>A spindle orientation control apparatus has a motor 102 for driving a spindle 101, speed control means 121 for rotating the spindle 101 at a speed in accordance with a command speed, and position control means 131 for stopping the spindle 101 at a commanded stopping position. The apparatus is further provided with stopping position command means 131 e for digitally instructing the spindle stopping position, a position sensor 105, error monitoring means 153, 156 for monitoring an error between the commanded stopping position and the actual rotational position of the spindle and for generating a signal when the error attains a predetermined value, and means 141 for generating a signal indicative of an orientation speed. When the apparatus is in a spindle orientation control mode, the spindle is speed-controlled so as to rotate at the orientation speed until the error monitoring means 156 generates said signal, and is position-controlled after the generation of the signal so as to reduce the error to zero.</p> |
