22 / 2021-06-18 14:22:08

Accurate Offline Electrical Parameters Identification for Air-bearing PMLSM

PMLSM， electrical parameters identification， inverter nonlinearity， signal injection

The accurate electrical parameters of PMLSM is important for precision control. This paper studied the electrical parameter identification, and discussed the method that injects “DC+AC” voltage to identify the d-q axis incremental inductance. In order to improve the identification accuracy, the injected signal characteristics and inverter nonlinearity were considered. Finally, the resistance and d-q axis incremental inductance were identified, and the q-axis identification experiments were implemented in different current values. Through Piecewise Cubic Hermite interpolation, a smooth q-axis current-incremental inductance curve was achieved. The effectiveness of the proposed identification scheme was confirmed on an air-bearing PMLSM.