APPARATUS FOR DRIVING INDUCTION MOTOR

摘要

A DRIVING APPARATUS OF AN INDUCTION MOTOR APPLIED FOR DRIVE OF A FAN OF AN AIR CONDITIONER HAS A VOLTAGE LIMITER UNIT FOR LIMITING AN UPPER LIMIT OF AN OUTPUT VOLTAGE OF AN INVERTER CIRCUIT, A VOLTAGE SLOW- UP UNIT FOR CONVERTING AN OUTPUT SIGNAL OF AN OUTPUT VOLTAGE COMMANDING UNIT INTO A SIGNAL WHICH INCREASES GRADUALLY WHEN THAT OUTPUT SIGNAL RISES, A VOLTAGE SLOW-DOWN UNIT FOR CONVERTING THE OUTPUT SIGNAL OF THE OUTPUT VOLTAGE COMMANDING UNIT INTO A SIGNAL WHICH DECREASES GRADUALLY WHEN THAT OUTPUT SIGNAL FALLS, AND A FEED INTERRUPTION PROCESSING UNIT FOR SETTING THE OUTPUT SIGNAL VALUE OF THE OUTPUT VOLTAGE COMMANDING UNIT TO 0 WHEN INTERRUPTING FEEDING AND DELIVERING A FEED INTERRUPTION SIGNAL AT THE TERMINATION OF THE LAPSE OF A PREDETERMINED TIME (FIG. 1)