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目前,小型拖拉机大多采用以永磁交流发电机供电的交流电系,一般只供给照明用电。这种电系的构造原理比较简单,工作比较可靠,但是如果使用维护不当,也会常常出现故障。 1、永磁交流发电机自身具有自动调节输出电流的特性,当发电机转速升高到一定数值后,负载电阻变化时,输出电流近似保持不变。由于发电机的端电压等于输出电流与负载电阻的乘积,因此当发电机在额定转速下运转时,发电机的输出电压就随负载电阻而变化,负载电阻增大时,电压升高;负载电阻减小
At present, most small tractors use AC power systems powered by permanent magnet AC generators, which generally only supply lighting electricity. The principle of the electrical system is relatively simple, more reliable work, but if used improperly maintained, it will often fail. 1, permanent magnet alternator itself has the characteristics of automatic output current adjustment, when the generator speed increases to a certain value, the load resistance changes, the output current remains approximately the same. Since the terminal voltage of the generator is equal to the product of the output current and the load resistance, the output voltage of the generator changes with the load resistance when the generator is operating at the rated speed. When the load resistance increases, the voltage increases. The load resistance Decrease