Research on the Influence of Main Flux Path Saturation on Induction Motor Drive Systems
摘要
Simulating induction motor saturation is essential for performance prediction in conjunction with drive algorithms. A practical model that factors in main flux path saturation facilitates integration with induction motor control techniques. This model employs the T-form equivalent circuit derived from the linear model and simulates the saturation effects by attributing no-load characteristics to the excitation inductance. Due to the saturation state of the induction motor at the rated point, the current predicted by the linear model will deviate from the actual current. This work compares performance disparities between saturated and linear models under V/f control, Field-Oriented Control, and Direct Torque Control. Results show that the saturation model predicts higher current amplitudes and reduced harmonics compared to the linear model. Additionally, improperly oriented FOC with a saturation model results in a magnetic field that escalates with load. Notably, in the weak magnetic state of a specific load, incorrect direction may lead to a decrease in current amplitude.