This study is focused on the speed control performances of a Permanent Magnet Syn-chronous Motor electric vehicle drive system. Electric Vehicles (BEV) are becom-ing more common place in the transportation sector in recent times. In such vehicles, permanent magnet synchronous motors (PMSM) and Lithium Ion batteries are mostly used. The Lithium Ion batteries are used because of their high energy and current den-sity while the PMSM is used because of its dynamic performanceAn electric vehicle motor is required to have high power, high torque, wide speed range, high efficiency, reliability, robustness, low noise, small size and flexibility and should be able to work at different operating conditions. To achieve these dynamic performance requirements, high performance controllers which can tolerate external disturbances, internal param-eter variations and unmolded dynamics are needed. In this thesis, a composite control scheme is designed by employing super twisting slid-ing mode control with space vector pulse width modulation technology. Usually, PI controller is used as a speed controller for a Permanent Magnet Synchronous Motor (PMSM) in high performance drive system. PI controller is simple but sensitive to pa-rameter variations and external disturbance.Due to these reasons,Sliding Mode Control (SMC) is proposed.Aquasi-continuous sliding mode controller is designed for PMSM in order to regulate the desired reference speed with robustness and eliminate chatter-ing. FOC is used for the operation of the motor to control the torque and flux of the motor directly as DC motor. For the investigation of the problem,a speed and current double closed-loop simulation model of PMSM and the controller has been tested through a reference speeds as well as with load variations through simulation using MATLAB/SIMULINK. The simulation results show that,the system has good dynamic, steady-state perfor-mance,robustness and the speed error in steady state response is zero.The system gives good performance at loaded and no load conditions and hence it can work with different load torque conditions and system parameter variation. xv Abstract Keywords: PMSM,SM control,FOC,super twist algorithm SMC,EV, chattering effect.