Flux Saturation Model and Self-identification Method of Permanent Magnet Synchronous Motor Considering the Magnetic Flux of Permanent Magnet

This paper describes the flux saturation model and self-identification methods for flux saturation, considering the flux saturation phenomenon in a permanent magnet synchronous motor. The flux saturation data are obtained by injecting d-q axis voltages individually or simultaneously. When only the d-axis voltage is injected, d-axis self-saturation data can be obtained. When only the q-axis voltage is injected, the cross saturation occurs because of the q-axis flux and the d-axis permanent magnet flux. Q-axis self-saturation data requires generating a d-axis current such that the d-axis flux becomes zero, which can be difficult depending on the system. This paper proposes a flux saturation model and estimation method considering the cross-saturation effect of permanent magnets. The proposed algorithm was verified using an 11kW IPMSM.