Parameter and performance comparison of doubly-fed brushless machine with cage and reluctance rotors

The cage and reluctance rotors are two main types of rotor structure used in doubly-fed brushless machine (DFBM). In order to study comparatively the effect of different rotor structure on the behavior of DFBM, a prototype machine has been specially designed and built. The experimental parameter and performance comparisons between the axially laminated anisotropic (ALA) reluctance rotor and cage rotor machine are presented in the paper. It is indicated that the cage rotor DPBM has relatively better starting and asynchronous characteristics, however, the ALA reluctance rotor DFB exhibits fine synchronous operation and doubly-fed adjustable speed performances