CAJ | 학술논문

针对车用交流发电机在低转速下噪声值偏高并伴有啸叫声的现象，基于实验研究车用交流发电机的噪声特性。首先在发电机上布置转速仪、加速度传感器和传声器，采集发电机在空载及负载状态下振动和噪声的时域信号；其次利用频谱、阶次分析等方法，找出了发电机在负载工况下低转速时噪声峰值的主要阶次成分；最后提出改进措施，对改进后的发电机进行测试，并对比分析改进前后发电机噪声的变化情况。分析结果表明，在低转速下发电机的主要噪声是电磁噪声，该电磁噪声的阶次成分与定子铁芯槽的个数相关，并且提出的改进措施能有效的降低发电机的电磁噪声。
침대차용교류발전궤재저전속하조성치편고병반유소규성적현상，기우실험연구차용교류발전궤적조성특성。수선재발전궤상포치전속의、가속도전감기화전성기，채집발전궤재공재급부재상태하진동화조성적시역신호；기차이용빈보、계차분석등방법，조출료발전궤재부재공황하저전속시조성봉치적주요계차성분；최후제출개진조시，대개진후적발전궤진행측시，병대비분석개진전후발전궤조성적변화정황。분석결과표명，재저전속하발전궤적주요조성시전자조성，해전자조성적계차성분여정자철심조적개수상관，병차제출적개진조시능유효적강저발전궤적전자조성。
For the noise of automotive alternators at low speed is high and accompanied by whistle, the noise characteristics of a vehicle’s alternator were studied experimentally. Firstly, tachometer, acceleration sensors and microphones were laid out in the generator and the signal of the generator in time domain under load-free and loading condition was collected. Secondly, the main order components of the noise peak value of the generator were found through the methods of frequency spectrum and order analysis in the loading condition and at low speed. Finally the improvement measures are put forward and the improved generator was tested. The noise of the improved generator is compared with that of the original generator. Analysis results show that the main noise of the generator at low speed is electromagnetic noise;the order components of the electromagnetic noise is associated with the slot number of stator core; and the improvement measures can effectively reduce the electromagnetic noise of the generator.