Abstract
This paper presents a detailed literature review on switched reluctance motor (SRM) and drive systems in electric vehicle (EV) powertrains. SRMs have received increasing attention for EV applications owing to their reliable structure, fault tolerance ability and magnet free design. The main drawbacks of the SRM are torque ripple, low power density, low power factor and small extended speed range. Recent research shows that multi-stack conventional switched reluctance motors (MSCSRM) and multi-stack switched reluctance motors with a segmental rotor (MSSRM-SR) are promising alternative solutions to reduce torque ripples, increase torque density and increase power factor. Different winding configurations such as single-layer concentrated winding (SLC), single layer mutually coupled winding (SLMC), double layer concentrated winding (DLC), double layer mutually coupled winding (DLMC) and fully-pitched winding (FP) are introduced in the literature in recent years to increase average torque and to decrease torque ripples. This research analyzes winding methods and structure of the SRMs, including conventional and segmental rotors. They have been compared and assessed in detail evaluation of torque ripple reduction, torque/power density increase, noise/vibration characteristics and mechanical structure. In addition, various drive systems are fully addressed for the SRMs, including conventional drives, soft-switching drives, drives with standard inverters and drives with an integrated battery charger. In this paper, the SRM control methods are also reviewed and classified. These control methods include strategies of torque ripple reduction, fault-diagnosis, fault-tolerance techniques and sensorless control. The key contributions of this paper provide a useful basis for detailed analysis of modeling and electromechanical design, drive systems, and control techniques of the SRMs for EV applications.
Highlights
The switched reluctance motor (SRM) has some advantages compared to the induction motor (IM) and permanent magnet synchronous motor (PMSM), such as a magnet-free and robust rotor structure that allows high speed operations and is inherently fault tolerant
The SRM is fully reviewed as a suitable candidate for the electric vehicle (EV) applications with high torque performance, robust structure and fault tolerance properties
The segmental rotor, multi-stack structures, different winding configurations, different drives and control methods are developed to overcome the main drawback of the high torque ripple
Summary
The switched reluctance motor (SRM) has some advantages compared to the induction motor (IM) and permanent magnet synchronous motor (PMSM), such as a magnet-free and robust rotor structure that allows high speed operations and is inherently fault tolerant. Due to these reasons, SRM is a promising traction machine candidate for electric vehicle (EV) applications. Torque ripple minimization is one of the most important and challenging SRM design aspects when the requirements of traction applications are considered. Two approaches are used to decrease torque ripples: structural design and advanced SRM control methods [4]. Different converter topologies and control methods were developed to decrease the torque ripples [4]
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