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一农用汽车在低速行驶时,电流表指针偏向正极(10安培)发电:当加大油门时,电流表指针回到“0”位不发电。拆机检查,发现交流发电机已大修过,用万用表测量均正常。仔细检查,发现激磁绕组的线头与滑环靠在一起,但所焊的锡不起作用。分析其原因是:由于线头与滑环靠在一起,所以用万用表测不出问题,当发动机以低速运转时,线头弹力大于离心力,故能发电,但当发动机以高速运转时,离心力大于线头的弹力,使线头与滑环分开,
An agricultural car at low speed, the ammeter pointer bias positive (10 amps) Power: When the throttle is increased, the ammeter pointer back to the “0” bit does not generate electricity. Disassemble inspection and found that the alternator has been overhauled, with a multimeter measurements are normal. After careful inspection, it was found that the coil of the excitation winding head and slip ring together, but the solder tin does not work. Analysis of the reasons is: due to the line head and slip ring together, so no problem with the multimeter, when the engine runs at low speed, the thread is greater than the centrifugal force of elasticity, it can generate electricity, but when the engine runs at high speed, the centrifugal force is greater than the thread Elastic, so that the thread and slip ring separate,