Park vector method-based fault-tolerant motor system multi-power-tube open-circuit fault diagnosis method

Abstract

The invention discloses a Park vector method-based fault-tolerant motor system multi-power-tube open-circuit fault diagnosis method. The method comprises steps of conducting park vector transformationon six-phase current of the fault-tolerant motor; and calculating a normalized average value of the three orthogonal space current vectors in one period in real time, detecting open-circuit faults ofthe single-power tube and the double-power tube by comparing a module value normalized average value of the current vectors with a fault threshold, and realizing positioning of the fault power tube according to positive and negative polarities of normalized average values of real parts and imaginary parts of the current vectors. According to the method, single-power-tube and double-power-tube open-circuit fault diagnosis during normal operation and open-circuit / short-circuit fault fault-tolerant operation of the permanent magnet fault-tolerant motor system can be accurately and quickly realized, the fault threshold does not need to be adjusted under the working conditions of different loads and rotating speeds, the robustness for rotating speed sudden change and load sudden change is high, the fault diagnosis capacity, reliability and fault-tolerant operation performance of a permanent magnet fault-tolerant motor system are remarkably improved, and the high reliability requirement ofan airborne electric actuator can be effectively met.

Description

technical field [0001] The invention belongs to the technical field of motor system fault diagnosis, and in particular relates to a fault-tolerant motor system multi-power tube open-circuit fault diagnosis method based on the Park vector method for a highly reliable airborne electric actuator. Background technique [0002] In recent years, with the rapid development of power electronics technology, material science and modern control theory, the multi-electric / all-electric aircraft has achieved a major breakthrough in technology, and the aircraft servo actuation system is gradually changing from a multi-energy form actuation system to a single electric power system. Actuation system development. The application of the electric actuation system simplifies the structure of the airborne secondary energy system of the aircraft, reduces the weight of the aircraft, and improves the efficiency, maintainability and reliability of the aircraft. With the advantages of miniaturization...

AI Technical Summary

Problems solved by technology

However, when the permanent magnet fault-tolerant motor is operating in an open-circuit fault or a short-circuit fault, the remaining non-faulty phase windings are asymmetrical and non-sinusoidal currents. If a secondary open-circuit fault occurs in the power switch tube, the traditional method cannot realize fault diagnosis during fault-tolerant operation.

Images