| 摘要 |
PURPOSE:To reduce the torque ripple of a DC motor by comparing the voltage of a condenser forming a low pass filter between a power source and the motor and a rotating speed deviation voltage and controlling the motor driving transistor with the compared result. CONSTITUTION:An operational amplifier 6 compared the speed voltage from a tachometer generator 8 with the speed reference voltage of an input terminal 7. The output of the amplifier 6 becomes positive at the starting time, the voltage of the condenser 9 is low, and the voltage of an input terminal 5b is lower than the voltage of an input terminal 5a, and the output of a Schmitt trigger 5 becomes ''H'' level, a transistor 4 turns ON, and a motor 1 is started. When approaching to the vicinity of the set speed, the deviation voltage form the amplifier 6 decreases, the voltage at the input terminal 5a becomes lower than that at the input terminal 5b, the transistor 4 turns OFF, and the voltage of the condenser 9 decreases. When the voltage at the input terminal 5b becomes lower than that at the input terminal 5a, the transistor 4 turns ON, and the voltage of the condenser 9 rises. Thereafter, the operation is repeated. |
