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The Wound-Rotor Design and Finite Element Analysis of Wound-Rotor Brushless Double-Feed Motor

In this paper, firstly the operation principle of the brushless double-fed motor is introduced. Secondly by means of the single-pole slot-number phase diagram, the rotor windings are designed and analyzed, and it is proved that the designed motor can assure the equality of the induced branch EMF and satisfy the demands of other electrical properties. Finally, on the basis of analyzing the design principle of the BDFM, the Ansoft/Maxwell is used to establish the model of doubly-fed brushless machine with the wound rotor, the 2-D transient electromagnetic fields of brushless doubly-fed machine (BDFM) is calculated by finite element method, the magnetic force line and air-gap magnetic field is got, and the air-gap magnetic fields is analyzed by the harmonic spectrum. After the analysis of the finite element, the design of the BDFM with wound rotor structure can be achieved in this paper, and it provides the foundation for the rotor structure design optimization of BDFM and it also provides guiding significance for the BDFM.