| 摘要 |
PURPOSE:To obtain an apparatus for driving an electromagnet which operates at a high speed using a relatively low power supply voltage, by controlling the driver circuit so that the other coil is excited with the adhesion state by one coil being maintained, and the one coil is demagnetized when adhesion is switched. CONSTITUTION:A pair of coils SR, SL are connected in parallel with a DC power supply E. A transistor QR1 is provided between the coil SR and the positive side of the DC power supply E, and a serial circuit of a transistor QR2 and a resistor R1 for detecting a current is connected between the coil SR and the negative side of the DC power supply E. Connected in parallel with the coil SR is a serial circuit of a diode CR1 which is coupled oppositely of the direction of the exciting current of the coil SR and a Zener diode ZDR which is coupled oppositely of the direction of the counter-electromotive voltage generated in the coil SR. A diode CR2 is connected in parallel with the coil SR and the serial circuit of the transistor QR2 and the resistor R1, oppositely of the direction of the exciting current of the coil SR. This can similarly be applied to the coil SL. A driver circuit 20 is controlled by a control circuit 21.
|
