| 摘要 |
PURPOSE:To rapidly energize a motor at an overload time and to break it by forming a bridge circuit with a motor and a resistor, and connecting a transistor through resistors connected in parallel with the capacitor at the middle point. CONSTITUTION:A bridge circuit is formed of a DC motor M and resistors R1- R3, and a transistor Q1 connected with a start signal input terminal 3 at the base is connected in series with the bridge circuit. A transistor Q2 is connected through a resistor R5 in parallel with a capacitor C at the middle point of the bridge circuit and is connected to the base of the Q1. Accordingly, the motor M is energized by the ON of the Q1 at the starting time, the Q2 is turned ON by the counterelectromotive force of the motor, thereby continuing the operation of the motor, and the voltage at the middle point is lowered by the deceleration of the motor M at the overload time, the Q2 is interrupted with reverse bias by the operation of the capacitor C, thereby interrupting the energization of the motor M in high responsiveness. |
