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

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 nonlinearproblems otherwise achievable only with time-consuming computer-based numericalsimulation tools. The suggested analytical methodology, therefore, offers immediateanswers regarding the rated torque performance at the early stages of the machinesizing and design process. In this chapter, the switched reluctance machine ratedtorque calculation is derived based on the analytically estimated flux-linkagecharacteristic map and the knowledge of the DC bus voltage of the machine. It isfurther demonstrated that the proposed analytical rated torque calculations, based onvector analysis, enable construction of highly accurate instantaneous phase currentprofiles using a graphical method and thus aiding intuition and providing valuableinsight into the nonlinear switched reluctance machine operation and controlrequirements.The proposed method will be found particularly suitable for those studying thenonlinear design and control of switched reluctance machine technologies for electricvehicle traction and industrial applications