Rotor Modification of Switched Reluctance Motor to Improve Performance on EV Grade Application

Nowadays the transportation transforms to electrification by the raise of fossil fuel demands and environmental air pollution collapse. Due to this reason the electric vehicles (EVs) are introduced to reduce the fuel demands and go green. The main challenge in EVs are high cost and low mileage. These two factors are mainly depending on the selection of motor in the EV application. The current trends of EV motors material are rare earth permanent magnet comes with high cost. The low-cost material and simple manufacture Switched Reluctance Motor (SRM) is competitor in EVs motor [1]. The main drawback of SRM in EVs creates low torque density, commutation high torque ripple, radial force noise and it makes vibration [2]. This paper discusses the design of SRM with different rotor modification topology to select the suitable structure for EVs to overcome from torque ripple and density. The four different modifications in rotor round teeth, straight teeth, taper and round teeth, taper and straight teeth are analyzed using FEA simulation tool, other machine parameters are optimized. In this study, the drive duty cycle for SRM machine is selected based on the rating of power and speed. The value consider for this study are 20kW and 2750rpm and the results are discussed. The four rotor modification in SRM for EV application the geometry parameters are optimized. The change in rotor structure, teeth, width and compare their analysis with efficency, torque and power [3]. The electric vehicle body dynamics parameter driving conditions for 750kg at 60kmph. The drag coeffieint is 0.35, frontal area factor is 2.121m2 ,rolling resistance coefficient is 0.029m and coefficient of aerodynamic resistance is 0.38 and rotational inertia factor is 1.04. The SRM electric vehicle total force derived using the above condition the expected torque is 70Nm. The SRM 20kW calculating outer diameter and stack length using this equation[ 4]