The most effective way to improve the commutation of DC servo motors is to add commutating poles, but the following points must be noted:
1. Correctly select the commutation polarity. For electric motors, the commutating pole polarity should be the opposite of the next main pole that is turned along the armature, and the generator should be the same.
2. The commutating winding must be in series with the armature winding.
3. The commutating pole magnetic circuit should be unsaturated.
In addition, we should reasonably choose the brush, and then require the contact resistance of the brush and the commutator surface to be as large as possible, and the brush wear resistance is better. The DC servo motor is generally selected to be an electrochemical graphite brush. The low-voltage and high-current motor generally uses a metal stone brush. For servo motors with particularly difficult commutation, a split brush is generally used.
