Motor control device and electric power steering device

摘要

There is provided a motor control device for controlling a motor including plural sets of windings, which is configured so that, when a fault detection means detects a fault, inverters in the normal side other than in the fault side are continued to be controlled by normal-time current control means and further, inverters in the fault side are continued to be controlled by fault-time voltage commands generated by a fault-time current control means configured with a fault-time normal-side command generator and a fault-time fault-side command generator, so as to emphasis a torque ripple of the motor when a winding fault of the motor or an inverter fault occurs, to thereby cause a user to surely recognize the fault.

主权项

1. A motor control device which controls a motor including plural sets of windings, comprising:
a plurality of inverters each having switching elements for respective phases of each of the plural sets of windings, which control voltages applied to the respective phases; a current controller which controls currents caused to flow the plural sets of windings, by giving to each of the inverters, voltage commands corresponding to the voltages applied to the respective phases, according to a total required torque-current value that is equivalent to a target value of a torque to be generated by the motor; and a fault detector which detects a short-circuit fault in the switching elements, or an earth short-circuit or voltage short-circuit fault in the inverters or the plural sets of windings; wherein the current controller has a normal-time current controller which is used at normal time so as to control, respectively, the currents caused to flow the plural sets of windings, and a fault-time current controller which generates a fault-time voltage command according to a content of the fault detected by the fault detector; wherein, when the fault detector detects the fault, the current controller continues controlling the inverter in the normal side by the normal-time current controller while continuing controlling the inverter in the fault side by the fault-time voltage command generated by the fault-time current controller, to thereby emphasis a torque ripple; and wherein the fault-time current controller uses the phase without fault in the fault side and at least one of the respective phases in the normal side, to generate a torque calculated by adding, to a motor torque to be generated at normal time and in a phase range where a brake torque due to a fault phase is not generated, a reverse-direction torque against the direction of the brake torque.