Research of an Axial Flux Stator Partition Hybrid Excitation Brushless Synchronous Generator

An automobile generator has stringent requirements on its weight and volume. As a combination of permanent magnet and electric excitation motor, hybrid excitation machine has the merits of small size, lightweight, and adjustable output voltage, which can meet the requirements of the vehicular generator. In this paper, a novel axial flux stator partition hybrid excitation brushless synchronous generator (ASHG) is proposed. First, the structure and the operating principle of ASHG is illustrated. Afterward, the shape of the magnetic pole is optimized to obtain the air-gap flux density with low harmonic component. Finally, the regulation performance of the magnetic field and output voltage are investigated by using the 3-D finite-element analysis method. The result indicates that the ASHG has a good ability to adjust the terminal voltage.