Study on controlling chaos of permanent magnet synchronous motor in electric vehicles

The objective of this study is to analyse chaotic motion and its control in a Permanent Magnet Synchronous Motor (PMSM) in an Electric Vehicle (EV). Complex non-linear behaviours are observed over a range of parameter values in the bifurcation diagram. Hopf bifurcation and chaos may even occur in the PMSMs if the PMSMs are not properly sized. The Lyapunov exponent approach is utilised to identify the onset of chaotic motion and to verify the above analyses. Finally, an approach for effectively controlling a chaotic PMSM system is presented. The state feedback control procedure is employed to control chaotic motions in the PMSM effectively. Simulation results are presented to demonstrate the feasibility of the proposed approach.