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Finite element analysis of brushless doubly-fed machine with equidistant cage rotor
Author(s): 
Pages: 507-510,522
Year: Issue:  4
Journal: Electric Machines and Control

Keyword:  finite element analysisbrushless doubly fed machinesequidistant cage rotorrotor harmonic magnetic fieldrotor leakage impedance;
Abstract: The problem of inefficiency of brushless douldy fed machine(BDFM) with cage rotor is researched. The efficiency depends on efficiency of rotor magnetic field pole-number conversion and leakage impedance of rotor. Optimal design of BDFM structure is the original approach to improve performance. Based on analysis of characteristic of BDFM with cage rotor, a new rotor structure-equidistant cage rotor is presented. The novel rotor has communal end link and independent cascade rotor conductor loop. The pitch of the loops is equal. It is done that finite element analysis of different rotor structures by ANSYS. Rotor magnetomotive force harmonic content and leakage impedance parameter are calculated. The result shows that the rotor resistance and leakage impedance of BDFM with new rotor structure are small, and rotor harmonic magnetic field contents, corresponding with poles of stator power windings and control windings, are high;the other high-order harmonic magnetic field contents are low.
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