| 摘要 |
PURPOSE:To enable to stop an AC motor to the prescribed position by altering the time for applying a power voltage to the AC motor in response to a power source frequency. CONSTITUTION:A detection signal from a microswitch MS1 is inputted to a timer circuit, and the drive of an AC motor is controlled by the timer circuit. The timer circuit varies the variable resistor VR of an integrator which is composed of a capacitor C1 and the resistor VR connected to terminals 6, 7 of a monostable multivibrator MM to control the timing for controlling a transistor TR ON and OFF. Thus, the time until the power voltage supplied to the AC motor is actually turned OFF can be arbitrarily set in response to a power source frequency. |
