公开(公告)号：US5030900A

公开(公告)日：1991-07-09

申请号：US397444

申请日：1989-08-14

申请人： Shinichi Kono ,  Hironobu Takahashi

发明人： Shinichi Kono ,  Hironobu Takahashi

IPC分类号： H02P3/06 ,  G05B19/23 ,  G05B19/39

CPC分类号： G05B19/237 ,  G05B19/39 ,  G05B2219/41007 ,  G05B2219/42104 ,  G05B2219/42114 ,  G05B2219/42203 ,  G05B2219/42215 ,  G05B2219/43127 ,  G05B2219/43194

摘要： A spindle orientation control apparatus according to the invention provides a spindle (4) for which a magnetic sensor senses the spindle and outputs stopping-position proximity (LS) signal and a stopping position determination (MS). The spindle (4) is coupled via gear or belt (5) to a spindle motor (2) wherein the spindle is controlled to stop at a fixed position based on a velocity command conforming to velocity of the spindle motor (4). Velocity pulses for detecting the rotational velocity of the motor can be employed as position pulses. A velocity command value (VCMD) can be reduced by an amount corresponding to a number of fed back velocity pulses a. The velocity value is clamped at a predetermined level when the velocity command value of the spindle attains a predetermined level until a final changeover. The final the spindle changeover for making equal stop-position decision signal (MS) signal and the velocity command value when an edge of the stop-position proximity signal (LS) signal is detected. Monitoring of position from velocity pulses can also be performed also at velocities less than an orientation velocity, and a second orientation velocity can be determined after the introduction of power. This makes it possible to stop the spindle at a fixed position in a short period of time.