Slip Ring and Brush Device of Cummins Diesel Generator Set

Cummins diesel generator set shall be subject to medium maintenance every six months or work for more than 1000 hours accumulatively. In addition to minor repair of Cummins diesel generator set, the slip ring and brush device shall be overhauled, the bearings of Cummins diesel generator set shall be thoroughly inspected and cleaned, and the insulation of motor and winding shall be inspected. The inspection of the slip ring and brush device of Cummins diesel generator set includes the inspection of the status of the slip ring and brush device, as well as the necessary cleaning, repair and measurement.

Clean the working collector ring or commutator, brush and brush holder of Cummins diesel generator set, which shall be free of oil, dirt, carbon, clean, bright and in good contact. When wiping, use a soft, dry, clean and hairless cloth dipped in a little gasoline, and pay special attention to cleaning Cummins diesel generator brush holder, collector ring or commutator root and mica groove.

The polished and rounded outer surface of collector ring and commutator shall be very smooth, usually dark brown. If burning marks, blackening or slight mechanical scratches are found on Cummins diesel generator set, they shall be polished. Use fine glass sandpaper, find a piece of hardwood with appropriate width, press the sandpaper on the outer surface of the collector ring or commutator with the wood plate, then rotate the motor rotor at low speed until the outer surface of Cummins diesel generator set is smooth, and finally carry out serious cleaning work.

During polishing, pay attention to cutting off stator and rotor winding circuits to avoid electric shock or live working. If the outer surface of the collector ring or commutator is seriously burnt or out of round (abnormal cylinder, serious swing), the rotor shall be taken out and the outer surface of the Cummins diesel generator set machine tool shall be rounded. The surface roughness of the circular commutator shall meet the requirements. The circular commutator shall also be engraved with mica sheets and cleaned. The height of mica sheets between commutator sheets cutting mica sheets shall be 0.5-1.2 mm lower than that of commutator sheets under normal conditions, otherwise the next cutting shall be considered.

If the Cummins diesel generator set is found to have a large flashover, the pressure can be increased appropriately. The distance between the lower end of the brush grip and the slip ring surface shall not be less than 2-3 mm. The flexible connection of Cummins diesel generator brush shall not be too tight and shall be correct and reliable. In order to improve the commutation performance of Cummins diesel generator set, the relative position of electric brush and magnetic pole should be adjusted, the commutation magnetic pole should be installed, and the appropriate brush characteristics should be selected. The grinding of new electric brush or ablated electric brush on the contact surface must be carried out to make the Cummins diesel generator set work well with the collector ring or commutator before use. Place the sand free bread of Cummins diesel generator set on the collector ring or the outer ring of the commutator, let the brush spring compress the brush, and rotate the rotor counterclockwise to make the Cummins diesel generator set motor operate normally until more than 80% of the lower end of the brush It is in close contact with the outer ring of collector ring. After the brush is polished, the installation direction or grip shall not be changed. Before formal use, the no-load test run shall be conducted for 2-3 minutes, and then the power load shall be gradually increased.

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