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武昌南内燃机务段曾出现东风_4型内燃机车主发电机转子励磁绕组接地的情况。经万用表测量,滑环对地电阻仅1Ω左右。我们对转子外观反复检查,没有发现任何异状。若按常规将18个励磁线圈分解检查是相当麻烦的,尤其励磁线圈之间采用铜焊联接,拆装更加困难。为此,我们摸索出一种新办法,只用几分钟就把故障范围确定了。检查办法如图所示。在滑环与地之间通入一定的励磁电流,依据滑环Ⅰ到接地点部分的线圈有电流通过会产生磁场的原理,用20～30厘米长铁棒(或角钢之类的铁磁物质)依次横跨相邻两磁极的铁芯构成磁桥。在搭接时感受到电磁吸力,证明该磁路有磁通存在,即铁棒所接近的磁极线圈有电流流过,以此追踪接地
Wuchang South internal combustion engine section has appeared Dongfeng _4 type diesel locomotive main rotor excitation winding grounding situation. The multimeter to measure slip ring to ground resistance is only about 1Ω. We repeated inspection of the rotor appearance, did not find any abnormalities. It is quite troublesome to decompose 18 exciting coils according to the conventional method, and in particular, the brazing connection between the exciting coils is more difficult to assemble and disassemble. To this end, we worked out a new approach, only a few minutes to determine the scope of the fault. Inspection methods as shown. In the slip ring and the ground between a certain excitation current, according to slip ring Ⅰ to the grounding point of the coil current will be generated by the principle of magnetic field, with 20 ~ 30 cm long iron rod (or angle iron and the like A magnetic bridge is formed in turn across the cores of two adjacent poles. In the lap when you feel the electromagnetic suction to prove that there is a flux magnetic circuit, that is close to the iron rod pole coil current flow, in order to track the ground