Motor control device, failure detection method, electric power steering device equipped with them, and vehicle

摘要

[PROBLEMS] To reliably detect an open failure or short-circuit failure of a switching element of a motor drive circuit having a multi-system motor winding, a disconnection failure or short-circuit failure of a coil winding, and other failures such as disconnection or short-circuit in the drive circuit. A highly reliable motor control device, a failure detection method, an electric power steering device and a vehicle equipped with the same are provided. In a motor control apparatus for controlling a three-phase motor having multi-system motor windings via a motor drive circuit for each winding system based on a current command value, the three-phase motor is provided for each multi-system motor winding. Current detection circuit for detecting each phase current, a three-phase / two-phase converter for converting each detected phase current into two phases for each multi-system motor winding, and two-phase current for each multi-system motor winding And a failure diagnosis unit that performs a failure diagnosis by comparing a difference between current calculation results between the multi-system motor windings and an integrated value thereof with a failure determination threshold value. The same processing calculation can be performed for the three-phase current. [Selection] Figure 7