What are the causes of ring fire in DC motors?

When the DC motor is running, a strong arc appears around the commutator surface, which is the so-called "ring fire" phenomenon. What are the causes of DC motor ringfire? The following answers for you
(1) The commutator inter-piece voltage is too high, causing the motor to run over-voltage, and then commutator inter-piece breakdown and ringfire will occur.

(2) due to poor maintenance of commutator, cleaning is not serious, commutator mica groove in the accumulation of carbon powder and copper powder, or due to the bridge squeeze copper, commutator copper burr extension lead to adjacent commutator short circuit, these conductive substances are constituted by the conductive bridge in the mica groove.

(3) cause commutator to produce ring fire another important factor is brush sparks, when the DC motor operating under extremely harsh load conditions, commutator surface sliding, contact serious damage, the brush and commutator will produce serious sparks between.
The above is to introduce you to the causes of DC motor ring fire phenomenon, more information about the motor related information welcome to contact us at any time