| 摘要 |
PURPOSE:To restrain peak wave, by a method wherein a compensating unit, having the same degree of gain as a current control unit, is provided to output to the current control unit upon switching normal into reverse. CONSTITUTION:An antiparallel thyristor Leonard 1 is employed to control a DC motor 2. A control circuit 10 is constituted of a speed control unit ASR, a current control unit ACR, a phase controller PA, a switching logic CL and the like and is provided with a voltage feedback circuit 20, for shortening a waste time T, and a changeover circuit 30. In this case, a compensating unit 40, consisting of an amplifier A41, set so as to have the same gain as the transient gain of the current control unit ACR, and the amplifier A42 for converting polarity, are added to the circuit. Here, one output of the amplifier 41 is added to a feedback voltage and the voltage of a voltage dividing circuit D and the other output of the same is impressed on the input side of the amplifier A24 of the voltage feedback circuit 20 whereby a difference, corresponding to the transient gain, is impressed on a capacitor C3 when a switch SW7 is closed. As a result, the transient gain, remaining upon switching, may be compensated and an output may be smoothed. |
