High-frequency residual error-characteristic correlation type permanent magnet motor turn-to-turn short circuit fault diagnosis method

Through the high-frequency residual-feature correlation method, high-frequency rotation voltage signal is injected and voltage residual is calculated, which solves the problem of operating condition interference and difficult to detect minor faults in the interturn short circuit fault diagnosis of permanent magnet synchronous motor, and realizes efficient fault diagnosis under complex operating conditions.

CN120507686AActive Publication Date: 2025-08-19HARBIN INST OF TECH
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Patent Information

Application Number
CN202510646170.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-20
Publication Date
2025-08-19
Estimated Expiration
2045-05-20

AI Technical Summary

Technical Problem

When the existing permanent magnet synchronous motors are diagnosed between turns, the fault characteristics are easily disturbed by operating conditions, and minor faults are not easy to diagnose, and common methods are difficult to achieve accurate diagnosis under complex operating conditions.

Method used

The high-frequency residual-feature correlation method is adopted to inject high-frequency rotation voltage signals, collect high-frequency current and voltage, calculate the high-frequency voltage residual, and use the least squares method to obtain the fault characteristic quantity, and combine the high-frequency residual-feature correlation analysis model to judge the inter-turn short-circuit fault.

Benefits of technology

Multi-level diagnosis of minor to severe faults is achieved, the fault phase is distinguished from the severity of faults, and the diagnostic effect is maintained under dynamic operating conditions of speed or torque changes, which improves the robustness of the diagnosis.

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Abstract

The invention discloses a high-frequency residual error-feature correlation type permanent magnet motor turn-to-turn short circuit fault diagnosis method, belongs to the technical field of permanent magnet motor fault diagnosis, and aims to solve the problems that fault features are easily interfered by working conditions and slight faults are difficult to diagnose when turn-to-turn short circuit diagnosis is carried out on an existing motor. The method comprises the following steps: step 1, high-frequency signal injection and information acquisition; injecting the high-frequency rotating voltage signal into a motor control system under a natural coordinate system; collecting each phase high-frequency current and each phase high-frequency voltage of the motor through a band-pass filter; 2, subtracting the high-frequency voltage from the healthy voltage, and calculating to obtain a high-frequency voltage residual error of each phase; step 3, obtaining fault characteristic quantity FIn of each phase according to the motor parameters, the high-frequency voltage of each phase and the high-frequency voltage residual error; and 4, judging whether a turn-to-turn short circuit fault and a fault phase occur or not according to the fault characteristic quantity of each phase.
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