The faults of brushed motor commutation equipment mainly include brush wear, abnormal noise and sparks. The following is to talk about the causes of sparks in the motor commutator and several maintenance methods for the phenomenon of sparks in the brushes.
1) Ring fire occurs around the motor commutation equipment: 1. The main reason for the failure: the brush position is incorrect; the brush is too soft; the rotor is short-circuited; the polarity sequence of the main pole and the commutation pole is wrong; 2. Maintenance method: adjust the brush location; replace brushes; find short circuits, locally repair or replace rotor; reconnect.
2) Sparks appear on the motor brushes when the load is loaded, and when the load increases, the sparks also increase.
①The main reason for the failure: the position of the brush is wrong; the polarity of the main pole and the commutation pole is wrong; the connection between the commutation pole and the main pole causes some or all of the commutation pole to be shunted; the commutation pole is too weak or too strong; The clearance between the pivot and individual or all commutation poles is too small or too large.
2. Maintenance method: adjust the position of the brush; check and correct the order of the main pole and the commutation pole; use an insulation resistance meter to check the insulation resistance between the main pole and the commutation pole, and deal with it accordingly.
3) The spark under the brush of a certain pole of an electric bicycle is more severe than other electrodes: 1. The main reason for the failure: the distance between the brushes is uneven; the main pole where the spark is more severe is short-circuited; the commutating pole where the spark is more severe is inter-turn Connection or short circuit; 2. Maintenance method: adjust the position of the brush; replace the brush; replace the main pole; replace the commutation pole.