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Hangzhou Dingteng Industrial Co.,Ltd | Updated: Oct 11, 2017The brush is in contact with the commutator to provide armature current for the rotor windings. Electromagnetic DC motor brushes are generally used metal graphite brush or electro-chemical graphite brush. The core of the rotor is laminated with silicon steel sheet, which is generally 12 slots, 12 sets of armature windings are embedded, and the windings are connected with 12 pieces respectively. The excitation winding of shunt DC motor is connected with the armature winding.