Analysis of Electromagnetic Performance of a New Dual-Rotor Hybrid Excitation Generator

In order to solve the problems of the unadjustable magnetic field of the permanent magnet generator and the high failure rate of the brush claw pole electric excitation generator, a new type of dual-rotor hybrid excitation generator (HEG) is proposed, which is composed of a suspended brushless claw pole electric excitation rotor and a built-in combined magnetic pole permanent magnet rotor. A magnetic field analysis method for the new HEG is proposed, which establishes equivalent magnetic circuit models considering the leakage flux and magnetic circuit distribution. The end leakage flux path of the permanent magnet rotor and the axial leakage flux path of the claw pole rotor are analyzed. The main magnetic flux and air gap magnetic flux of the permanent magnet rotor and claw pole rotor are calculated by using the equivalent magnetic circuit method and mesh hole method. Through the finite element method, the leakage flux coefficient of the synthetic magnetic field of the HEG is calculated, and the electromagnetic performance is analyzed to verify the correctness of the magnetic field analysis method and the rationality of the magnetic field distribution. Finally, a prototype is built and tested. The results show that the proposed HEG has the advantages of a wide magnetic regulation range, stable output voltage, and good output performance. © 2025 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.