Abstract
Brushless Doubly Fed Machine (BDFM) shows economic promise as a variable speed drive or generator. Seeking for rotor structures with higher modulation effect will be the most important role at present for improving the efficiency and performance of BDFM. After presenting the principle and providing the parameters of BDFM, this paper analyzes the air gap flux density of BDFM with different rotor structures and various pole numbers by using finite element analysis software ANSOFT. The effect of rotor structures and pole numbers on magnetic field modulation of BDFM can be obtained, these conclusions could lay the foundation for BDFM structure optimizing design.
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