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Equivalent circuit for the brushless doubly fed machine (BDFM) including parameter estimation and experimental verification

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5 Author(s)
Roberts, P.C. ; Dept. of Eng., Univ. of Cambridge, UK ; McMahon, R.A. ; Tavner, P.J. ; Maciejowski, J.M.
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Experimental results from a frame size 180 brushless doubly fed (induction) machine (BDFM) fitted with four rotor designs are presented. The machine is intended for use as a variable speed generator, or drive. A per phase equivalent circuit for the machine has been developed and a method of obtaining parameters for the circuit is described. Expressions for the torque as a function of speed have been derived and predictions of machine performance in both self-cascaded and synchronous (doubly fed) modes have been verified experimentally. The work illustrates the link between rotor equivalent circuit parameters and machine performance and a comparison between rotor designs has been made.

Published in:

Electric Power Applications, IEE Proceedings -  (Volume:152 ,  Issue: 4 )