PMSM drive system inverter open-circuit fault online diagnosis method
A drive system, open-circuit fault technology, applied in the direction of instruments, measuring electrical variables, measuring devices, etc., can solve similar problems, reduce the possibility of misdiagnosis, do not affect the drive control, and increase the effect of hardware equipment
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[0041] The present invention will now be further described in conjunction with the embodiments and drawings:
[0042] Such as figure 1 As shown, the PMSM drive system inverter open circuit fault diagnosis method in the present invention. The specific implementation is as follows:
[0043] Step 1: Use the state observer to estimate the PMSM three-phase current, obtain the three-phase current observation value, and make the difference between the current observation value and the actual value of the three-phase current in the system feedback to obtain the observation residual of the three-phase current.
[0044] The observer used to track the PMSM three-phase current is the Lomberg observer, and the expression is:
[0045]
[0046] among them, u(t)=(u d ,u q ) T , Y(t)=(i d ,i q ) T , K is the feedback coefficient matrix, A, B, C are the coefficient matrix in the PMSM state equation.
[0047] Such as figure 2 Shown is the change of the three-phase current residuals of the motor when th...
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