Hybrid Switched Reluctance Motors for Electric Vehicle Applications with High Torque Capability without Permanent Magnet

Abstract

In electric vehicle (EV) applications, hybrid excitation of switched reluctance motors (HESRMs) are gaining popularity due to their advantages over other EV motors. The benefits include control flexibility, simple construction, high torque/power density, and the ability to operate over a broad speed range. However, modern HESRMs are constructed by increasing the air gap flux density with permanent magnets (PMs) in the excitation system in order to generate more electromagnetic torque. This study aims to investigate a new topology for increasing the torque capabilities of HESRM without the use of permanent magnets (PMs) or other rare-earth components. This paper provides a comprehensive evaluation of the static and dynamic characteristics, software analysis using the Ansys 2D finite element method (FEM), and an experimental demonstration of the real-time motor with an advanced control strategy in MATLAB/Simulink. Our simulation and experimental results for a machine with 12/8 poles and a machine rating of 1.2 kW indicate that the HESRM designed without PMs has greater torque capability and efficiency than the conventional SRM. The proposed HESRM without PMs has a high torque/power density and a higher torque per ampere across the entire speed range, making it suitable for EV applications.

Recent Achievements in the Control of Interior Permanent-Magnet Synchronous Machine Drives: A Comprehensive Overview of the State of the Art

“…Even more topology combinations are plausible, as shown in [10], where a combination of all three topologies (HEPMa-SynRM) was investigated. In paper [11], a hybrid-excited SynRM was investigated (HE-SynRM) without PMs.…”

Development of Efficient Energy Management Strategy to Mitigate Speed and Torque Ripples in SR Motor Through Adaptive Supervisory Self-Learning Technique for Electric Vehicles

“…For switched reluctance (SR) motors, [5] has implemented sophisticated PI and PD controllers for speed, current and torque control, respectively. The SRM speed is controlled by a PID by effectively calibrating the Particle Swarm Optimization technique and minimizing the error [6]. The PID controller is widely used in industrial process control loops, but for smooth functioning, its parameters must be tweaked.…”

Influence of the Rotor Geometry on Efficiency and Torque Ripple of Switched Reluctance Motor Controlled by Optimized Torque Sharing Functions

“…The SRM control methods mentioned above usually do not interfere with the machine design. There are a few exceptions, such as [22], where the hybrid excitation of the stator poles requires a non-conventional SRM control strategy. Our research, in contrast to the studies mentioned above, is specifically focused on investigating the influence of the rotor geometry on the efficiency and torque ripple during optimal TSF control.…”