| 摘要 |
PURPOSE:To control the rotating speed of a motor to be controlled by displacing the mechanical resonance point of the motor by supplying a control signal of rotating speed to signal converter and controlling the rotating speed with the output of the converter. CONSTITUTION:When a setter 1 is operated to input a control signal of the prescribed value to a signal converter 2, a speed set signal corresponding to the signal is generated from the converter, compared by a comparator 3 with the speed signal, and the control voltage is supplied to an inverter 4. Thus, the inverter 4 supplies the drive power of the voltage and frequency in response to the control voltage to an induction motor 6, thereby rotating the motor 6. The converter 2 has stepped discontinuous characteristic at part of the output signal characteristic for the input signal so tht the rotating speed of the motor 6 may not be permanently held in mechanical resonance. |
