CAJ | 학술논문

针对永磁同步发电机转子永磁体在受到高温、大电枢电流、振动等因素影响出现的局部失磁故障，该文对1.5 MW、32极、并联支路数为4的分数槽永磁同步发电机的失磁故障特征进行了研究。首先建立了该发电机全域非对称运行时二维瞬态电磁场数学模型，采用场路耦合时步有限元法，分别对电机在无失磁以及不同程度失磁故障状态下的电磁场进行了计算。通过对失磁故障前后电机磁场分布、不同位置点磁密随时间变化轨迹、气隙磁场谐波含量、支路反电势波形以及各支路电流波形等特征量演变规律的研究，找出了电机失磁故障的特征，为永磁同步发电机失磁故障在线监测和诊断提供了理论依据。最后，通过对一台失磁故障400 W、10极永磁同步发电机的仿真计算与实验结果的对比分析，验证了计算方法的合理性。
침대영자동보발전궤전자영자체재수도고온、대전추전류、진동등인소영향출현적국부실자고장，해문대1.5 MW、32겁、병련지로수위4적분수조영자동보발전궤적실자고장특정진행료연구。수선건립료해발전궤전역비대칭운행시이유순태전자장수학모형，채용장로우합시보유한원법，분별대전궤재무실자이급불동정도실자고장상태하적전자장진행료계산。통과대실자고장전후전궤자장분포、불동위치점자밀수시간변화궤적、기극자장해파함량、지로반전세파형이급각지로전류파형등특정량연변규률적연구，조출료전궤실자고장적특정，위영자동보발전궤실자고장재선감측화진단제공료이론의거。최후，통과대일태실자고장400 W、10겁영자동보발전궤적방진계산여실험결과적대비분석，험증료계산방법적합이성。
For the permanent magnet partial demagnetization on the permanent magnet synchronous generator rotor due to the high temperature, the large armature current and the vibration, the demagnetization characteristics were investigated on the permanent magnet synchronous generator with the parameters of 1.5 MW, 32 poles, 4 parallel branches and fractional slot. Firstly, the mathematical model of the 2D transient electromagnetic field was established under asymmetric operation, and the electromagnetic fields in the normal operation and the different degree demagnetization operations are calculated respectively by using field-circuit coupled step finite element method. Secondly, the electromagnetic field distributions before and after the permanent magnet demagnetization, the variation trajectory of the flux density in different location points, the harmonic values of the air-gap, the EMF waveform and the current waveform of the each branch were studied, and the demagnetization characteristics could be obtained, which could provide a theoretical basis for the online monitor and diagnosis of the permanent magnet synchronous generator. Finally, by the comparison of the calculation results and the test data of a 400 W, 10 poles permanent magnet synchronous generator with the permanent magnet demagnetization, the rationality of calculation method could be verified.