Research Article

[Retracted] Fault Diagnosis Method of Rotor Magnetic Field Local Demagnetization in Permanent Magnet Synchronous Motor Model Predictive Current Control System

Figure 7

The extracted 3/4 order harmonic current based on adaptive signal extraction algorithm and its three-dimensional time-frequency spectrum based on the Hilbert transform. (a) The extracted 3/4 order harmonic current based on adaptive signal extraction algorithm. (b) Three-dimensional time-frequency spectrum based on Hilbert transform.
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