Design and experimental analysis of a wound brushless doubly Fed machine based on a rotor with the reluctance effect

Brushless doubly fed machine BDFM) is a new type of motor that has bright prospect in industrial application, especially in the field of wind power generation. Here, a wound BDFM based on a rotor with the reluctance effect is proposed, it integrates the flexible connection method of wound rotor winding and the magnetic flux-oriented effect of the reluctance rotor, which restrains higher harmonic and has strong coupling ability. This paper introduces the structure of the new motor and elaborates the magnetic field modulation mechanism, then analyse the performance with the system's output power 6.4 kW using finite element method (FEM). To validate the FEM results, a 30 kW prototype is designed and manufactured. The prototype test verifies the correctness of the simulation results and also manifests the superiority of both steady-state and dynamic performance of the motor.