多相高速混合励磁发电机气隙磁场解析研究

Analytical research of airgap magnetic field of multi-phase high-speed hybrid excitation synchronous generator

基于提高功率密度和电励磁调节能力的需求,提出一种并列式转子结构多相高速混合励磁发电机,其永磁转子为离散halbach结构,电励磁转子为隐极结构。分别给出永磁转子和电励磁转子的无槽气隙磁场模型,并给出定子和电励磁转子各自单独开槽时的复数相对气隙磁导计算方法。对于电励磁转子,转子磁路饱和的影响也被考虑。在此基础上建立并列式转子混合励磁发电机的开槽气隙磁场模型,并针对气隙磁密和空载电压进行了解析分析。研究结果表明:解析结果与有限元结果较为一致,验证了解析法用于混合励磁发电机设计的可行性与正确性。

Based on the requirement for improving power density and the adjustment ability of electrical excitation, a multi-phase high-speed hybrid excitation synchronous generator with parallel rotor structure is proposed, in which segmented halbach permanent magnet rotor and non-salient pole rotor are adopted. The models of slotless airgap field for permanent magnet rotor and electrical excitation rotor were given re- spectively. The relative airgap permeances for only the slotted stator and slotted electrical excitation rotor were given respectively using the calculation methods of complex relative airgrap permeance. The effect of rotor magnetic saturation was also considered for electrical excitation rotor. On this basis, the calculation models with slotted airgap magnetic field of hybrid excitation synchronous generator with parallel rotor were established and the analytical anlysis of flux density and noload voltage were carried out. The results show that the analytical results are in agreement with the finite element results and the feasibility and va- lidity of analytical method used for hybrid excitation synchronous generator design is verified.