Abstract
This paper proposes a new type of variable-flux permanent magnet motor, named “open-delta flux-modulating consequent pole motor” (OFCM). The armature winding ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">W<sub>a</sub></i> ) of the proposed OFCM is connected in an open delta, and it also serves as a field winding ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">W<sub>f</sub></i> ) by simultaneously supplying it with three-phase armature current and DC field current. The flux linkage of <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">W<sub>a</sub></i> can be adjusted by changing the field current. The flux-regulation capability and torque characteristics of the OFCM were investigated through finite element analysis (FEA) and experiments on a prototype machine. Using FEA, efficiency maps of the OFCM were also compared to those of a flux-modulating consequent pole motor (FCM) with <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">W<sub>f</sub></i> . The results show that the OFCM without <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">W<sub>f</sub></i> has significantly higher efficiency and maximum torque than the FCM.
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