Simulation of permanent magnet synchronous motor vector control for electric vehicles considering magnetic saturation

Abstract

To solve the problem that the motor parameter was selected singly in motor weakening control system without consideration of motor parameter changes under different conditions, and resulting in the underutilized motor performance, the effects of dq axis inductance changes on the weakening control system were investigated. Taking permanent magnet synchronous motor for electric vehicles as example, the models were established respectively for 2D electromagnetic field analysis and mathematical analysis in different vector control methods. According to the dq axis flux equations, the dq axis inductances with different d-axis and q-axis currents were calculated by finite element method with consideration of dq axis magnetic cross-coupling impact on magnetic saturation. The obtained inductances were substituted into the system simulation model in vector control of id=0 control and weakening control. The features of motor control were compared under the conditions with consideration and without consideration of magnetic saturation in different control methods. The results show that the motor performance with consideration of magnetic saturation in weakening control system is more fully utilized with accurate simulation of motor performance.