Abstract

Due to the expected increase in the electric vehicles (EVs) sales and hence the increase of the price of rare-earth permanent magnets, the switched reluctance motors (SRMs) are gaining increasing research interest currently and in the future. The SRMs offer numerous advantages regarding their structure and converter topologies. However, they suffer from the high torque ripple and complex control algorithms. This paper presents an improved direct instantaneous torque control (DITC) strategy of SRMs for EVs. The improved DITC can fulfill the vehicle requirements. It involves a simple online torque estimator and a torque error compensator. The turn-on angle is defined analytically to achieve wide speed operation and maximum torque per ampere (MTPA) production. Moreover, the turn-off angles are optimized for minimum torque ripples and the highest efficiency. In addition, this paper provides a detailed comparison between the proposed DITC and the most applicable torque control techniques of SRMs for EVs, including indirect instantaneous torque control (IITC), using torque sharing function (TSF) strategy and average torque control (ATC). The results show the superior performance of the proposed DITC because it has the lowest torque ripples, the highest torque tor current ratio, and the best efficiency over the low and medium speed ranges. Moreover, the comparison shows the advantages of each control technique over the range of speed control. It provides a very clear overview to develop a universal control technique of SRM for EVs by merging two or more control techniques.

Highlights

  • This paper presents an improved direct instantaneous torque control (DITC) strategy of switched reluctance motors (SRMs) for electric vehicles (EVs)

  • This paper provides a detailed comparison between the proposed DITC and the most applicable torque control techniques of SRMs for EVs including the indirect instantaneous torque control (IITC) and the average torque control (ATC)

  • To develop the best control technique of SRMs for EV applications, a comparative study with a detailed analysis of control performance is essential to gain the benefits of each technique

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Summary

Introduction

In [28], the low-speed limits were handled by the online estimation of motor torque as a function of current and rotor position in the form of lookup tables. This paper presents an improved DITC strategy of SRMs for EVs. The proposed control uses a simple online torque estimator and calculates the instantaneous motor torque as a function of current and position to avoid flux integration errors and improve the low-speed operation capability. The control parameters are optimized for the best performance including maximum torque per ampere (MTPA), minimum torque ripples, extended speed operation, and high efficiency. This paper provides a detailed comparison between the proposed DITC and the most applicable torque control techniques of SRMs for EVs including the IITC and the ATC.

Machine Modeling
Switching Angles Optimization
Results of the Proposed
The Other Torque Control Techniques of SRM
Simulation Results of ATC
Simulation Results of IITC
Comparative Analysis and Discussion
Under EV Loading
Under Full Load Conditions
The Steady-State Torque Curves
Dynamic
Summary
Conclusions

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