Fault diagnosis method, system and device for permanent magnet synchronous motor as well as readable medium

Abstract

The invention discloses a fault diagnosis method, system and device for a permanent magnet synchronous motor as well as a readable medium. The fault diagnosis method for the permanent magnet synchronous motor comprises the following steps: carrying out calculation based on an analytic relationship model from stator current to stator flux linkage to obtain a first set of stator flux linkage values;carrying out calculation based on an analytic relationship model from stator voltage to the stator flux linkage to obtain a second set of stator flux linkage values; solving the difference between the second set of stator flux linkage values and the first set of stator flux linkage values to serve as an initial flux linkage residual; carrying out negative sequence primary and negative sequence secondary synchronous coordinate transformation on the initial flux linkage residual to generate a primary flux linkage residual and a secondary flux linkage residual; and extracting direct current components of the initial flux linkage residual, the primary flux linkage residual and the secondary flux linkage residual, and comparing the direct current components with preset thresholds respectivelyto determine relevant information about permanent magnet faults or sensor faults. Through the application of the above scheme, multiple faults existing in a phase current sensor, a rotor position sensor, a permanent magnet and the like of the permanent magnet synchronous motor can be detected online.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of fault diagnosis of driving motors, and in particular, to a fault diagnosis method, system and device, and a readable medium of a permanent magnet synchronous motor. Background technique [0002] As the core component of the electric drive system of new energy vehicles, permanent magnet synchronous motor is more and more applied due to its advantages of high power density and high efficiency. Because the electric drive system often works under severe conditions such as frequent start and stop, acceleration and deceleration, and vibration, it is prone to failure. The timely diagnosis and identification of the fault of the synchronous motor can effectively prevent the vehicle from running in dangerous conditions, thereby improving the driving safety factor. [0003] The faults of permanent magnet synchronous motor mainly include inverter fault, sensor fault, stator winding fault, rotor...

AI Technical Summary

Problems solved by technology

However, some of the above methods cannot separate the faults of the current sensor and the fault of the rotor position sensor, some are complicated to implement and require high computing power of the controller, and some need to obtain information about the entire vehicle and other components, making the fault diagnosis performance poor

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