| 摘要 |
PURPOSE:To conduct transition to control having high precision smoothly even on the light load of a motor and even on low set speed by computing an error signal from the value of half the reference value of one period of a tachometer generator on starting and driving the motor on the basis of the error signal. CONSTITUTION:A period detector 11 detects the period of the zero cross of a tachometer generator 2 on the starting of a motor 1, and transmits a period data over a memory 7c. A computing element 7b for a processor 7 computes the output of an error from the value of the period data and the value of half the reference value of one cycle, outputs the result of the computation to a digital-analog converter 13, and drives the motor 1 by a power amplifier 14. |
