Optimal torque per amp for brushless doubly fed reluctance machines

This paper documents the finite element (FE) analysis of a range of rotors for a brushless doubly fed reluctance machine (BDFRM). The aim to this work is to increase the understanding of the BDFRM and determine an optimal rotor design for torque generation and machine power factor. The results of the analysis show a significant contrast between the rotors for a synchronous reluctance machine and BDFRM. The optimal stacking factor for the BDFRM is 0.86, whereas the synchronous reluctance optimum is 0.5. Even though the two rotors can be physically identical, the resemblance is superficial.