The cause of the spark of the brush and the method of elimination

Update:19 Oct 2018
Summary:

There are two possibilities. One is that the brush cont […]

There are two possibilities. One is that the brush contact is not properly installed. The second is the rotor short circuit. Usually the brush unit pressure is too high, the brush wear is intensified, the unit pressure is too small, the contact is unstable, and mechanical sparks are prone to occur.

The cause of the spark of the brush and the method of elimination

Cause of cause

a Bad adjustment of the additional pole ----- Use shunt or adjust the additional pole air gap, or change the brush model.

b Mica highlights ------------- Under the mica or use a more abrasive brush

c Commutator riser joint disconnection ------ re-welding

d The brush position is incorrect ----------- Adjust the brush grip to the correct position

e The spacing or uneven arrangement of the brush holders ------- Correct the spacing and arrangement of the brush holders

f commutator or collector ring eccentric --- best to turn or re-grind at rated speed

g The commutator is loose, the commutator is high or low ------ tighten, turn or regrind

h The commutator has oil stains ------------Sweeping reversing plate and sealed bearing

i The brush is stuck or stuck in the brush holder --- check the correct size of the brush, clean the brush and brush holder to remove any burrs

j Electric brush wear-in is not good ------------- wear-in brush k brush model is not suitable for motor