Commutator, also known as "commutator". DC motor and AC commutator are important parts of motor armature. Many copper sheets separated by mica sheets form a cylindrical or disk shape, and each copper sheet is connected with some armature winding elements. When the armature rotates, the copper sheets are in contact with the fixed brushes one after another. In a DC motor, the alternating current in the armature winding is changed into the direct current between the brushes by brushes and commutators. In the AC commutator motor, make the frequency of AC between brushes meet the working requirements.