Motor control apparatus, electric power steering apparatus and vehicle using the same

摘要

A motor control apparatus includes a motor current shutoff unit inserted between a multi-phase inverter circuit and a multi-phase electric motor to shut off a current for each of plural phases, the inverter circuit including an arm for each of the plural phases, a redundant arm unit including one or more arms, a connection selecting unit selecting which one of windings of the electric motor is to be connected to each of the one or more arms of the redundant arm unit, an abnormal arm detection unit detecting an abnormality in each of the plural phases of the inverter circuit, and an abnormality control unit shutting off connection between an abnormal arm and the motor when the abnormal arm detection unit detects the abnormal arm, and connecting the one or more arms of the redundant arm unit to a winding of the motor shut off.

主权项

1. A motor control apparatus for controlling driving of a multi-phase electric motor, the motor control apparatus comprising:
a multi-phase inverter circuit including an arm configured to drive the multi-phase electric motor for each of a plurality of phases; a motor current shutoff unit inserted between the multi-phase inverter circuit and the multi-phase electric motor to shut off a current for each of the plurality of phases; a redundant arm unit including one or more arms whose number is less than the number of the plurality of phases of the multi-phase inverter circuit; a connection selecting unit configured to select which one of windings of the multi-phase electric motor is to be connected to each of the one or more arms of the redundant arm unit; an abnormal arm detection unit configured to detect an abnormality in each of the plurality of phases of the multi-phase inverter circuit; and an abnormality control unit configured to control the motor current shutoff unit to shut off connection between an abnormal arm and the multi-phase electric motor when the abnormal arm detection unit detects the abnormal arm, and to control the connection selecting unit to connect at least one of the one or more arms of the redundant arm unit to a winding of the multi-phase electric motor, the winding being shut off by the motor current shutoff unit, wherein the motor current shutoff unit includes a switch unit inserted between each of outputs of the multi-phase inverter circuit and each of the windings of the multi-phase electric motor, individually, the switch unit includes two field-effect transistors connected in series with each other such that directions of parasitic diodes are opposite to each other, and the multi-phase inverter circuit is connected to a direct current power supply via a power supply shutoff circuit having a duplicated system.