新型混合励磁发电系统用无刷励磁机电磁性能分析

本文提出了新型混合励磁发电系统,它由混合励磁发电机、无刷励磁机和旋转整流器构成,其中混合励磁发电机转子由结构上独立的两部分——永磁体和电励磁组成,定子铁心沿轴向分为三段:永磁部分定子铁心、电励磁部分定子铁心以及中间部分定子铁心,其中中间部分定子铁心采用非导磁材料。新型混合励磁系统具有永磁电机高效、高功率密度的优点。本文仅针对新型混合励磁发电系统中的无刷励磁机进行分析,无刷励磁机结构与绕线式异步电机结构相似,定、转子均采用三相绕组,无刷励磁机的转子与混合励磁发电机转子同轴,转子绕组经固定在同发电机转轴上的二极管整流将交流变为直流,供给混合励磁发电机励磁。同时本文采用电磁场有限元法对无刷励磁运行机理和电磁性能进行分析,其中包括供电电源类型、定子电流特性和转矩特性等。本研究成果对掌握无刷励磁机运行特性具有重要作用。

Performance Analysis of Brushless Exciter in a Novel Hybrid Excitation Power System

A novel hybrid excitation power system is presented in this paper. It is consist of hybrid excitation generator, brushless exciter and rotating rectifier. The rotor of hybrid generator is made of permanent magnet (PM) and electro-exciting similar with the rotor of non-salient synchronous machine. The stator core of hybrid generator is divided into three parts, corresponding to the PM, electro-exciting and parts between them separately. Only brushless exciter in the system is analyzed. The structure of the exciter is similar with the wounded rotor induction machine, and the rotor windings are connected to the electro-exciting of the hybrid generator by the rectifier. The theory and performance of exciter are calculated using the finite element method (FEM), which include the type of power supply, stator current characteristics, and electromagnetic torque characteristics.