Brushless doubly fed reluctance machines for low cost variable speed drives

The brushless doubly fed reluctance machine (BDFRM) is a form of slip power recovery machine that does not require brushes. Because of its slip recovery nature, it allows a smaller inverter to be used if the speed range required is limited. Therefore, in many applications, it may allow a lower system cost. This paper presents a comprehensive theoretical evaluation of a variety of different control strategies for this machine when fed by an inverter.