JPS57162974A - Deceleration controller for automatic door condenser motor - Google Patents

Abstract

PURPOSE:To obtain a deceleration controller capable of setting an optimum deceleration waveform by chopping an AC power source, supplying the AC current to a condenser motor, and regulating the pulse width of the chopped pulse to regulate a motor torque, thereby suppressing the noise to the minimum value. CONSTITUTION:Analog switches ANG1, ANG2 are alternately switched at every half wave of an AC power source voltage by the signals a , b of a drive unit 6, reference voltages m, n respectively regulated by variable resistors VR3, VR4 are alternately inputted to a comparator AMP3, chopped pulses of different width are inputted to the base of a power transistor Q3 at every half wave, thereby chopping the AC power source voltage. Eventually, the power source of reference voltage e is interrupted by the operations of switches S5, S1 per opened and closed door, the reference voltages m, n are attenuated together with the reference voltage e by the time constant of a capacitor C4 and a resistor R4, the output of the AMP3 becomes chopped pulse attenuated in its pulse width in the half waves of positive and negative sides, and the motor supply current is attenuated.