Protection of DC Motor under Transient Condition for Electric Vehicle using SENSEFET based Current Limit Controller

Abstract

xii ABSTRACT In Todays world, with the increase in fuel consumption leads to carbon emission which further cause global warming. The most feasible solution of this problem is the hybrid electric vehicle, electric vehicle and plug in hybrid vehicle. Performance of the electric vehicle depends upon the efficient operation of the motor utilized in it. In the proposed work, design of a current limit controller using SENSEFET technique for the protection of DC motor used in vehicle during transient condition such as breaking, starting, sudden load change and speed reversal has been done. The sensing of the voltage in the proposed controller has been done through the sensing resistor. The power losses in the current sensing techniques are minimized through the selection of the optimal value of sensing resistor. The switching of the motor for controlling the winding current during the transient condition was done through microcontroller programming. To improve the overall efficiency of the circuit, Cooling unit is incorporated in the circuit. The simulation of proposed controller has been done through Proteus software and its hardware implementation is also achieved to check its feasibility in the practical scenario. Current controller has been utilized for Permanent magnet DC motor working under the transient condition and the waveforms at different operating points of the controller are recorded at different instant of time.