| 摘要 |
PURPOSE:To enable a controlled motor to be quickly stopped, by interrupting reference voltage to the input terminal of an operational amplifier circuit to stop rotation, and by feeding only counter-electromotive voltage generated on the controlled motor. CONSTITUTION:A bridge circuit is composed of a DC motor 2 and resistances R1-R3, and the detection voltage at detection terminals 7, 8 is fed to an operational amplifier circuit 3. The operational amplifier circuit 3 supplies the driving transistors 12 and 13 with a positive or negative output voltage depending on the detection voltage and the reference voltage. In order to stop the DC motor 2, change-over switches 10, 11 is changed at a neutral position, and the application of the reference voltage is interrupted. As a result, the operational amplifier circuit 3 is worked so that the counter-electromotive voltage of the DC motor 2 may come to zero, and the DC motor 2 is suddenly stopped. When the DC motor 2 is stopped, then a switch circuit 16 is turned ON. |
