Motor driving device, electric oil pump, and failure detecting method of motor drive device

摘要

A motor drive device;Motor with rotor and statorAn inverter electrically connected to the motorControl device for controlling said inverterEquipped withThe control device comprisesVoltage command valueCurrent command valueA real current flowing between the inverter and the motorBased onAt least an impedance observer that estimates the change in the impedance of the motor andThe current command value andA comparator for calculating a difference between the inverter and the actual current flowing between the inverter and the motorIf the change in impedance exceeds or exceeds a predetermined thresholdOrIf the difference calculated by the comparator exceeds or exceeds a predetermined threshold,Fault detection output fault flag.