Abstract-The paper presents experimental results
to assess the performance of a variety of rotors
used in a Brushless Doubly Fed Machine
(BDFM). In the experiments the torque-speed
characteristics were measured on a BDFM fitted
with four rotors with five different windings. The
measurements were made of the machine excited
with just one stator supply with the second stator
supply first open circuit, and then short-
circuited. The results give valuable insight into
how different rotors, including a novel design of
BDFM rotor, will perform in a BDFM configured
as a variable speed generator. The results
highlight important differences between the
rotors related to their winding construction.
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