| 摘要 |
PURPOSE:To obtain a positioning control system having no variation due to a load by synchronizing and controlling the phase in the rotating speed control of a motor. CONSTITUTION:A waveform shaper 2 converts approximate sinusoidal signals A', B' outputted from an encoder 3 into rectangular signals A, B, a controller 1 measures the signals A, B, and outputs a speed indication pulse signal Pv on the basis of the position information of a motor due to the measurement. A phase comparator 9 compare the signal Pv with the phase of the signal A or B, and outputs the difference to low pass filter 10. The filter 10 supplies the signal Ph through an error amplifier 5 to a drive circuit 8. When approaching the target position, it is switched to a position detecting mode. At this time, the amplifier 5 supplies the signal A' or B' to the drive circuit 8. |
