关键词: 混合励磁电机, 外电路, 输出电压

Abstract: Compared with the permanent magnet synchronous motor,the hybrid excitation machine can adjust the air gap flux of the generator more flexibly, so that the generator has a wider magnetic adjustment range. The magnetic field regulation characteristics of the power of 400 kW,the speed of 16 000 r / min staggered pole hybrid excitation machines with two different structures were analyzed,and the influence mechanism of the proportional relationship between ferromagnetic pole and permanent magnet on electromagnetic performance was discussed. The size of the stator and rotor of the generator was designed,and the influence of the DC excitation current on the magnetic characteristics of the generator was studied. At the same time,the influence of the size ratio of ferromagnetic pole-permanent magnet on the saturation and voltage regulation performance of the rotor magnetic circuit was considered. The results show that with the increase of excitation current,the flux regulation ability of the generator changes nonlinearly due to the influence of the saturation of the rotor core. Under the premise of keeping the axial length of the permanent magnet unchanged,the increase of the length of the ferromagnetic pole could effectively expand the voltage regulation range. In addition,there was an optimal demagnetization interval for the axial length ratio of the ferromagnetic pole to the permanent magnet. When the ratio is 0. 3 ~ 0. 4, the best magnetic field regulation ability can be obtained while ensuring higher power density. The voltage regulation range of the two generators was compared. The electromagnetic parameter optimization model established in this study provides a theoretical basis for multiobjective collaborative design of high-speed hybrid excitation machines.

Key words: hybrid excitation machine, external circuit, output voltage