MOTOR DRIVER RECOVERING FROM INSTANT POWER CUT

摘要

PURPOSE: A device for recovering an instant power failure of a motor is provided to prevent stop of the motor by automatically supplying the power to the motor after an instant power failure. CONSTITUTION: A first control switch electronically controls the power supply about a motor(100). A mode selection switch(42) selectively connects one end of a secondary coil of a transformer(20) with an automatic terminal or passive terminal. A first driving coil and a second control switch are serially connected to the other end of the second coil. One end of the first contact switch is connected between the first driving coil and the second control switch. The first control coil is serially connected to the other end of the first contact switch. A third control switch is connected in parallel to the first contact switch. A protection switch(32) is serially connected to the first control coil and the second coil. A motor protection unit(30) determines the abnormality of three phase power supplied to the motor.