Off-line Parameter Identification of Linear Induction Motor Based on PWM Inverter

Considering the characteristics of linear induction motor that the primary leakage inductance and the secondary leakage inductance are not equal, the off-line parameter identification method for linear induction motor based on PWM inverter is proposed in this paper. Under the condition that the motor is stationary, single-phase DC voltage, single-phase high-frequency AC voltage, and single-phase low-frequency AC voltage are sequentially supplied to the motor to obtain primary resistance, mutual inductance, secondary leakage inductance, primary leakage inductance, and secondary resistance of the linear induction motor successively. Then, the offline parameter identification model of linear induction motor is established to carry out simulation experiments and verify the accuracy of the method. Finally, the proposed identification method is compared with the traditional no-load and locked-rotor experiment methods. The results show that the proposed identification method has higher precision for it considers the problem that the primary and secondary leakage inductance of linear induction motor are not equal.