Comprehensive electromagnetic design procedure for switched reluctance machines

Abstract

A comprehensive procedure allows an efficient and fast design of switched reluctance machines (SRM) by understanding the influence of relevant design parameters. So far, guides in literature use empirical values to set parameters, require extensive parameter variation or do not cover the whole design process. This paper addresses the complete electromagnetic dimensioning of rotor and stator geometry. First, the normalized torque production capability of the machine is calculated. Then, reasonable stator and rotor configurations are determined with help of intuitive design parameters. A good design selection is achieved by comparing the results (e.g. power density) of all valid design configurations. The proposed procedure depicts the strong correlation between the operating modes, cooling and outer dimensions of SRM. In conclusion, this procedure reduces the initial design period significantly. Furthermore, it helps to optimize existing designs and question specifications if leading to inefficient designs.