DRIVE CONTROL DEVICE AND DRIVE CONTROL METHOD FOR MOTOR

摘要

The present invention provides a motor drive control device provided with a shutoff circuit employing semiconductor relays and configured to drive a motor by a duty ratio control of an inverter, which stably drives the motor even in an operation state that drive duty ratio of phases are uneven. In the motor drive control device, output lines of three phases of the inverter circuit are connected to phases of the motor and further connected to a booster circuit, an output boosted by the booster circuit at a time of drive of the motor is distributed to semiconductor relays connected to respective phases of the motor, and furthermore, a switching circuit for stopping actuation of the booster circuit to shut off drive of the motor, is interposed in a line for supplying an electric power to the booster circuit.

主权项

1. A motor drive control device including an inverter circuit of n (which is equal to or greater than 3) phases of which output lines of respective phases are connected to respective phases of an n phase motor, and which controls drive of the motor based on an output signal of the inverter circuit;
the motor drive control device comprising: a booster circuit which is connected to output lines of at least (n−1) phases of the inverter circuit and boosts outputs of the output lines; semiconductor relays which are interposed in respective phases of the motor connected to the output lines of at least (n−1) phases of the inverter circuit and which are adapted to receive the outputs boosted by the booster circuit and distributed as relay drive signals at a time of driving the motor; and a switching circuit which stops actuation of the booster circuit and turns off the semiconductor relays to shut off the drive of the motor.