某柴油机柱塞泵有刷电机烧坏故障原因分析及改进

对某柴油机柱塞泵内烧坏的直流有刷电机的拆检表明:换向器镀铜层与电刷材料硬度匹配不当,导致换向器异常磨损,进而引起转子线圈电压不足是导致故障的主要原因.对此,从优化电刷与换向器材料硬度匹配以及提高换向器镀铜层厚度两方面对电机进行了整改.经试验验证:在电刷磨损量基本不变的情况下,换向器实际磨损率由15.6％减小至1.7％,...

Analysis and Improvement of the Burning Fault of a Brush Motorin the Plunger Pump of a Diesel Engine

The burnt DC brush motor in the plunger pump of a diesel engine was inspected,and the results show that the main cause for this fault was that the copper plated layer of the motor commutator was not properly matched with the hardness of the brush material,which led to abnormal wear of the commutator and the insufficient voltage of the rotor coil.Based on the analysis results,the motor was modified from the two aspects of optimizing the material hardness matching between the brush and the commutator,and increasing the thickness of the copper layer of the commutator.The test results show that with the basically unchanged wear degree of the brush,the wear ratio of the commutator is decreased from 15.6%to 1.7%,and the motor life is expected to reach 14500 h.The modification is effective.