Sliding Mode Speed Controller Design for Field Oriented Controlled PMSM Drive of an Electric Vehicle

The paper deals with an application of sliding mode control (SMC) in speed controller of field oriented controlled permanent magnet synchronous motor (PMSM) for a simplified model of an electrical vehicle. For the simplified one, zero-pole elimination method is utilized to design speed controller because of its simplicity. However, the method brings large integral constant time that makes speed response slow. In order to provide fast and robust-to-noise speed one, the SMC method is utilized to replace the zero-pole elimination (ZPE) one. Simulations at wide range of reference speed and load torque are carried out. Performance indices including steady-state error, overshoot and undershoot are employed to assess the speed controller design methods. Evaluated results confirm that the proposed SMC gives smaller performance indices than the ZPE method.