| 摘要 |
PURPOSE:To prevent rectification sections from being shortcircuited, by arranging the XOR gate of each driving signal, the AND gate of the output and forward- directional driving signal, and the AND gate of the output and reverse-directional driving signal. CONSTITUTION:By a regenerative braking control circuit, three-phase alternating current fed to a DC motor 1 is rectified at a forward-directional rectification section 2 and a reverse-directional rectification section 3, and voltage applied to the DC motor 1 is controlled, and a speed is controlled. The driving circuit 5 of the motor 1 is provided with an AC detector 6, and is composed of a speed detector 8, a speed discriminator 9, phase controllers 4, 7, switches 13-14, a change-over circuit 15, a rotating direction detector 16, TG polarity change-over switches 18-19, and the like. In this case, a XOR gate 23 and AND gates 24-26 are arranged, and the input of forward- directional driving signal from the change-over circuit 15 to the XOR 23 and the AND gate 24 is provided together with the forward-directional switch 14, and the input of reverse-directional driving signal to the XOR 23 and the AND gate 25 is also provided in the same manner, and the output is directed to the respective phase controllers 4, 7. Then, with the output of the AND gate 26, the whole system is stopped.
|
