Optimum design for composite rotor structural parameters of brushless doubly fed machines

Brushless doubly fed machine of have promising application prospect in VSCF wind power generation and energy-efficient drive field. Coupling capability of rotor is the important factor affecting power density. A novel rotor is presented, that is composite rotor including magnetic barriers and short-circuit cage. Using finite element method, the key parameters affecting the coupling capability are analyzed, such as pole arc factor, magnetic layer numbers, ratio of magnetic and non-magnetic, short-circuit ring, short-circuit set numbers and short-circuit layer numbers. This novel rotor is a promising rotor, which has simple structure, process convenience, stronger coupling capability and higher output torque density. Experiments were carried out to verify. This paper provides theoretical basis for designing novel rotor.