A Fault Diagnosis Method for Stator Winding Resistive Unbalance of Permanent Magnet Synchronous Motor Based on Signal Injection
A technology of permanent magnet synchronous motor and stator winding resistance, which is applied in the direction of electric winding test, electric measurement, electric variable measurement, etc., can solve the problems of easy misjudgment, achieve certainty and reliability, be easy to implement, and overcome inconsistency deterministic effect
Active Publication Date: 2019-01-01
HEFEI HENGDAJIANGHAI PUMP IND CO LTD
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However, this fault diagnosis method has certain shortcomings: the stator winding resistive unbalance fault and inter-turn short circuit fault have basically the same impact on the stator current and zero sequence voltage, which is easy to cause misjudgment
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[0031] Such as figure 1 , figure 2 as shown, figure 1 , figure 2 A method for diagnosing resistive unbalance faults of stator windings of permanent magnet synchronous motors based on signal injection proposed by the present invention.
[0032] refer to figure 1 , figure 2 , the signal injection-based permanent magnet synchronous motor stator winding resistive unbalance fault diagnosis method proposed by the present invention comprises the following steps:
[0033] S1. Inject n different AC signals into the reference current of the d-axis, the frequency of the AC signal is equal to the frequency of the fundamental wave, and record the phase current and zero-sequence voltage after each injection of the signal; where n is equal to 2;
[0034] S2. Calculate the average value of the secondary phase currents recorded in S1 and the average of the 2 zero-sequence voltages and calculated according to Estimate the offset ΔR of the resistance a , ΔR b , ΔR c ;
[0035] ...
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The invention discloses a PMSM (permanent magnet synchronous motor) stator winding resistive unbalance fault diagnosis method based on signal injection, and the method comprises the following steps: S1, injecting n different DC signals to a d-axis reference current, and recording the phase currents and zero sequence voltages after each injection of signals, wherein n is a natural number greater than two; S2, calculating the mean values (shown in the description) of n phase currents recorded at step S1 and the mean values (shown in the description) of n zero sequence voltages recorded at step S1, and estimating the deviations delta Ra, delta Rb and delta Rc of a resistor according to the calculated mean values (shown in the description) of n phase currents; S3, judging whether there is a resistive unbalance fault or not: judging that the A phase of a PMSM has the resistive unbalance fault if delta Ra is greater than zero, judging that the B phase of the PMSM has the resistive unbalance fault if delta Rb is greater than zero, judging that the C phase of the PMSM has the resistive unbalance fault if delta Rc is greater than zero, and judging that the PMSM does not have the resistive unbalance fault if Ra, delta Rb and delta Rc are respectively not greater than zero.
Description
technical field [0001] The invention relates to the technical field of fault diagnosis, in particular to a method for diagnosing a resistive unbalance fault of a stator winding of a permanent magnet synchronous motor based on signal injection. Background technique [0002] Permanent magnet synchronous machine (Permanent magnet synchronous machine, PMSM) has the advantages of high power density, high efficiency, large torque inertia ratio, and wide speed range. In recent years, it has been widely concerned and used in high-power applications such as wind power generation and elevator drives, as well as high-tech applications such as electric vehicles and CNC machine tools. [0003] When the permanent magnet synchronous motor is working, it has a complex electromechanical energy conversion process. In the long-term operation, due to the influence of the load condition and the operating environment, some components will gradually fail or be damaged. Its typical faulty componen...
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IPC IPC(8): G01R31/06
CPCG01R31/72
Inventor 杭俊陈文丁石川郑常宝李国丽
Owner HEFEI HENGDAJIANGHAI PUMP IND CO LTD