摩托车磁电机输出电压和频率随转速的上升而升高。磁电机线圈的感抗也随转速的上升而增加,但对电流的限制能力有限,中高速时前照灯还是会因过载而烧坏。笔者试验用频敏变阻器同前照灯串联的方法实现稳光取得了满意的效果。 频敏变阻器就是一个铁芯线圈,它的铁芯故意采用实芯铁芯而不用硅钢片。当线圈中通过频率较高的电流时,磁通变化在铁芯中引起很强的涡流损耗,使线 Motorcycle magneto output voltage and frequency increased with the rise of speed. Magneto coil inductance also increases with the speed increase, but the current limited ability to limit, in the high-speed or headlamps burn due to overload. The author experimented with frequency-sensitive rheostat in series with the headlamps achieved steady light achieved satisfactory results. Frequency-sensitive rheostat is a core coil, the core of its deliberate use of solid core instead of silicon steel. When the coil through the higher current, the flux changes in the core caused by a strong eddy current loss, the line