摘要
同步发电机带整流负载后 ,三相电枢绕组电流将出现谐波分量 ,其大小及成分与负载状况以及整流器的型式相关。发电机励磁绕组电流中也出现相应的谐波分量 ,即谐波电枢反应。谐波励磁电流形成的磁场在电枢绕组中感应谐波电势 ,发电机相电压波形产生畸变。对于航空无刷直流发电机 ,其主发及励磁机均为带整流器的同步发电机。主发的谐波电枢反应将耦合到励磁机 ,从而在励磁机的电枢及励磁绕组中 ,除自身谐波电枢反应引起的谐波分量外 ,还有新的谐波分量出现 ,其大小及频率与两级电机的极对数以及主发的工作状态有关。设置阻尼绕组可有效减小谐波电枢反应对磁极的影响。利用谐波电枢反应可实现励磁机、旋转整流器故障的监测与判断 ,也可用来判断未知无刷发电机中旋转整流器的型式和励磁机的极对数。本文可为无刷交、直流发电机的设计和维护提供理论依据。
Analyzes the harmonic armature reaction of brushless AC&DC generator. The armature winding current of synchronous generator with rectifier has harmonic contents. The order and the amplitude of the harmonic contents are related to the type of the rectifier and the loads. Because of the harmonic reaction, the exciting current of the generator also has harmonic current. It produces a magnetomotive force which induces harmonic voltage in the armature windings. As to brushless DC generator, the main generator and the AC exciter are both synchronous engine with rectifier. The harmonic reaction of the main generator affects the exciter. Except original harmonic contents, the armature and the exciting winding current have new harmonic contents related to the pole pair numbers of main generator, the exciter and operating condition. Harmonic reaction increases the loss of the pole, however, damper windings in the pole suppress the reaction. The harmonic contents are different under different operating conditions, thus, that could be used to diagnose faults of rotating rectifier and exciter. The harmonic reaction can also be utilized to judge the type of rotating rectifier and pole pair number of unknown brushless DC generator.[KH4/5D]
出处
《南京航空航天大学学报》
CAS
CSCD
北大核心
2000年第3期257-262,共6页
Journal of Nanjing University of Aeronautics & Astronautics
关键词
无刷交直流发电机
谐波电枢反应
故障诊断
设计
brushless electric machines
brushless AC&DC generator
harmonic armature reaction
rotating rectifier
fault diagnosis
