Average rated torque calculations for switched reluctance machines based on vector analysis

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.

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ORCID for Jan Sykulski: orcid.org/0000-0001-6392-126X

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