Abstract
In this paper, the optimization and characteristics analysis of a three-phase 12/8 switched reluctance motor (SRM) based on a Grey Wolf Optimizer (GWO) for electric vehicles (EVs) application is presented. This research aims to enhance the output torque density of the proposed SRM. Finite element method (FEM) was used to analyze the characteristics and optimization process of the proposed motor. The proposed metaheuristic GWO combines numerous objective functions and design constraints with different weight factors. Maximum flux density, current density, and motor volume are selected as the optimization constraints, which play a significant role in the optimization process. GWO performs optimization for each iteration and sends it to FEM software to analyze the performance before starting another iteration until the optimized value is found. Simulations are employed to understand the characteristics of the proposed motor. Finally, the optimized prototype motor is manufactured and performance is verified by experiment. It is shown that the torque can be increased by 120% for the same outer volume, by using the proposed method.
Highlights
Electric vehicle (EV) has been in operation for over a century
This study presents a constrained multi-objective optimization for the optimal design of an switched reluctance motor (SRM) based on the meta-heuristic Grey Wolf Optimization (GWO) algorithm
The proposed method utilizes finite element analysis (FEA) to observe the characteristic of the motor per iteration, which is crucial in SRM since the motor has highly non-linear magnetic characteristics
Summary
Electric vehicle (EV) has been in operation for over a century. Due to the energy crisis and environmental issues, EVs are going through a resurgence in interest to substitute the usual fossil fuel vehicles. It is desired that the electric motors for traction have a high average torque, low torque ripple, higher torque density, and higher efficiency to meet the requirements of traction performance of EVs applications [3]. Permanent magnet implementation, depending on its core materials, can significantly increase the efficiency and power density of an electric motor. Rare earth material (REM)-based PMs are the best-known option. Considering the availability and cost of the rare earth material-based PMs, the motors are expensive to manufacture. In consideration of the cost of PMs, the development of high performance rare-earth free motors for EVs applications has gained a multitude of attentions. Researchers stated switched reluctance motor (SRM) as an alternative drive for electric vehicles and it is becoming a strong competitor to the other drives. This simplicity leads to high robustness and low manufacturing costs compared to other AC machines, which is the main attractive point of SRMs
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