Open-circuit fault diagnosis method and device, motor controller and storage medium

Abstract

The invention discloses an open-circuit fault diagnosis method and device, a motor controller and a computer readable storage medium. The method comprises the steps of determining three-phase reference current values, and acquiring three-phase actual current values; for each phase in the three phases, calculating a difference value between the phase actual current value and the phase reference current value; and judging whether a power tube open-circuit fault occurs or not according to the difference value. By adopting the scheme of the invention, open-circuit fault diagnosis is carried out based on the difference value between the reference current and the actual current, the open-circuit fault diagnosis time is shortened on the premise of not adding an additional sensor, the diagnosis result has relatively high reliability, and a secondary fault caused by a power switch tube fault of a vehicle motor system can be prevented.

Description

technical field [0001] The present application relates to the field of motor control, in particular to an open circuit fault diagnosis method, device, motor controller and storage medium. Background technique [0002] When the car is running, it will be affected by the complex and variable environment, which makes the power devices in the sensors and inverters extremely prone to failure, which seriously threatens driving safety. [0003] Semiconductor power devices are the most vulnerable components in power electronic converters, mainly including open circuit faults and short circuit faults. There are already many mature hardware-based solutions for short-circuit faults. However, when an open-circuit fault occurs in a semiconductor power device (such as an IGBT), since the motor (such as a permanent magnet synchronous motor) can still run in an abnormal state for a period of time, it is not only difficult to find the fault, but also causes additional faults and damage to t...

AI Technical Summary

Problems solved by technology

However, when an open-circuit fault occurs in a semiconductor power device (such as an IGBT), since the motor (such as a permanent magnet synchronous motor) can still run in an abnormal state for a period of time, it is not only difficult to find the fault, but also causes additional faults and damage to the system

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