When the DC servo motor rotates, when the armature winding element passes from a branch through the brush and enters another branch, Servo Motor the direction of the current in the element changes. We refer to the change in the direction of the current in the element as commutation. The process takes a very short time,Servo Motor the direction of the current changes in a very short time, and the commutation element itself has an inductance, so the self-induced electromotive force generated is very large, causing sparks on the surface of the brush and the commutator.
The most effective way to improve the commutation of the DC servo motor is to install a commutation pole, but it must be noted that the commutation polarity is selected correctly. For electric motors, the polarity of the commutation pole should be opposite to the next main polarity turning along the armature, Servo Motor and the generator should be the same. The commutation winding must be in series with the armature winding. The commutation pole magnetic circuit should be unsaturated.
In addition, the brush should be selected reasonably, Servo Motor and the contact resistance between the brush and the commutator surface should be as large as possible, and the brush should have good wear resistance. Electrochemical graphite brushes are generally used in DC motors. Metallic jade brushes are generally used for low-voltage and high-current motors. Split motor brushes are particularly difficult for commutation
