The brushless doubly fed reluctance machine and the synchronous reluctance machine-a comparison

In order to gain a basic understanding of the optimal control properties of brushless doubly-fed reluctance machines (BDFRMs), and the tradeoffs between their size and inverter rating, as well as the comparative torque and power of the BDFRM with other machines, the authors compare the BDFRM and its cousin, the synchronous reluctance motor (SYNCREL). Where appropriate, the comparisons are carried out in a machine independent fashion using normalised analysis techniques. Much of the work in this paper requires some background in the space vector theory and d-q modelling of the BDFRM.