Abstract

An average rated torque estimation for generally saturable switched reluctance (SR) machines based on vector analysis is described. The proposed analytical method enables the switched reluctance machine designers to compute quickly and relatively accurately the rated torque of the machine. This approach offers simplicity, accuracy, and intuitive insight characteristic to analytical solutions of magnetically nonlinear problems otherwise achievable only with time-consuming computer-based numerical simulation tools. The suggested analytical methodology, therefore, offers immediate answers regarding the rated torque performance at the early stages of the machine sizing and design process. In this chapter, the switched reluctance machine rated torque calculation is derived based on the analytically estimated flux-linkage characteristic map and the knowledge of the DC bus voltage of the machine. It is further demonstrated that the proposed analytical rated torque calculations, based on vector analysis, enable construction of highly accurate instantaneous phase current profiles using a graphical method and thus aiding intuition and providing valuable insight into the nonlinear switched reluctance machine operation and control requirements. The proposed method will be found particularly suitable for those studying the nonlinear design and control of switched reluctance machine technologies for electric vehicle traction and industrial applications.

Highlights

  • Since the dawn of the popularity of the switched reluctance (SR) motors [1], many diverse developments of this machine’s technology have resulted, including theoretical analysis, and the volume of the published literature on these topics is enormous

  • The SR motor will be designed to operate from a fixed direct current (DC) voltage supply, such as a battery, and the stator windings of the machine will be of the concentrated type

  • The estimated rated torque and power of a general SR machine are the two most important quantities a machine designer is seeking at early stages of the machine design process

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Summary

Introduction

Since the dawn of the popularity of the switched reluctance (SR) motors [1], many diverse developments of this machine’s technology have resulted, including theoretical analysis, and the volume of the published literature on these topics is enormous. It will be shown that the two methods of Eqs. (5) and (7) are both special cases of the general torque production model based on quadrilateral area computation that is proposed in this chapter

General analytic theory for saturable switched reluctance machines
Switched reluctance machine energy conversion estimation and flux-linkage map construction
Saturable switched reluctance machine energy conversion ratio estimation
Saturable switched reluctance machine average rated current and voltage estimation
Saturable switched reluctance machine converter volt-ampere requirement estimation
Saturable switched reluctance machine generator mode energy conversion estimation
Findings
Conclusions

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