Online Multiparameter Identification Method for Dual Three-Phase PMSM Using Sinusoidal Current Injection

This letter elaborates an accurate online parameter identification method for dual three-phase permanent magnet synchronous motors. For resistance and inductance identification, sinusoidal currents are strategically injected into the dq-/xy-planes. Second-order generalized integrator-based quadrature signal generators perform the extraction and differentiation of signals. These techniques eliminate identification errors and instabilities caused by nonideal back electromotive force and inverter nonlinearity. In addition, for the identification of permanent magnet flux linkage, dc current is injected into the
d
-axis to eliminates
q
-axis voltage errors caused by inverter nonlinearity, ensuring high accuracy. Experiments have been conducted to validate the effectiveness of the proposed method.