Abstract
This paper analyzes the generation and influence mechanism of negative airgap eccentricity effect for in-wheel switched reluctance motor (SRM) driving system, and proposes an optimum control strategy to achieve cooperative optimal performance between in-wheel motor driving system and electric vehicle (EV). Firstly, the electromagnetic characteristic of SRM under airgap eccentricity is studied based on electromagnetic coupling model and circuit driving equation. Then, the negative effect of airgap eccentricity on the in-wheel SRM driving system is analyzed in timefrequency domain combined on the excitation characteristics of unbalanced radial force. Finally, an independent current chopping control strategy for in-wheel SRM driving system based on vehicle vibration feedback is proposed, and the controller parameters are optimized by interpolation. The simulation results show that the proposed optimum control strategy can improve the driving torque while restrain the unbalanced radial force, and effectively suppress the negative airgap eccentricity effect of in-wheel motor driving system. This study starts from the dynamics relationship between SRM, in-wheel motor driving system and EV, and lays a theoretical foundation for solving the negative dynamic effect of in-wheel motor driving system.
Optimum Control Parameters of Switched Reluctance Motor for Torque Production Improvement over the Entire Speed Range
