本发明提供一种能降低定子温度的上升和电磁噪音声级等的车辆用交流发电机。
The invention discloses AC generator for vehicle use capable of reducing temperature rising and grade of electromagnetic noise.
人们对噪音的感觉不但取决于声级的大小，而且还与噪音的频率有关。
Peoples sense on noise lies not only on the sound level but also on the frequencies of sound wave.
声级计以其简单，方便，成本低，精度高等一系列优点，成为航空器噪音测量方面主要的测量仪器之一。
Sound-level meter by its simple, convenient, the cost is low, the precision higher a series of merits, become one of aircraft noise measurement aspect main metering equipment.
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