| 摘要 |
PURPOSE:To enable a DC motor to surely control its rotational frequency to a target value by detecting fluctuation of amplitude and phase of a frequency signal and correcting a control signal of the DC motor in accordance with a detected output of this frequency signal. CONSTITUTION:A frequency signal from a frequency generator 11 and a pulse signal from a pulse generator 15 are supplied to a mixing amplifier 14 respectively through a frequency discriminator 13, memory-correction circuit 31 and a phase comparator 18. In a memory mode of an initializing action mode, an output of the frequency discriminator 13 is integrated for a predetermined time by an integrator 32 and held. Next in the memory mode, an output of the integrator 32 is supplied to the mixing amplifier 14 through the memory-correction circuit 31. Simultaneously, a deviation of the output of the frequency discriminator 13 from the integrated output of the integrator 32 is successively stored in memory in the memory-correction circuit 31. And in a speed control action mode, the output of the frequency discriminator 13 is corrected by the deviation data stored in memory in the memory-correction circuit 31. |
