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Commutation pole commutation pole also consists of core and windings. Medium and small capacity DC motor commutation pole core is made of a single piece of steel, large capacity DC motor commutation and demanding motor commutation pole cores with thin steel folded commutation pole winding to the armature windings series, due to the large current through the wire cross-section larger, fewer turns. Commutation pole mounted between the main pole commutation pole is generally equal to the number of main poles, power a small motor, for sometimes only half the number of poles of the main pole to pole number, do not install or commutation pole. Commutation pole role is to improve the commutation prevent between brushes and commutator too strong spark.

(3) by the brush brush brush gear unit, brush holder, brush and compression spring rod frame and other components. Brush with carbon - graphite and other pieces made of conductive brush box installed in the brush holder, compression spring with it pressed against the surface of the commutator. Spring-loaded pressure can be adjusted to ensure that brush and commutator surface with good sliding contact brush holder fixed to the brush rod, the brush rod holder mounted on the stems, insulated from each other. Brush holder mounted on the rod bearing cap or cover, according to the size of the current brush each rod can brush group consisting of several brushes, brush set is generally equal to the number of the main poles. The role of the brush with the commutator is introduced, drawing current.

(4) frame and cover frame ships with steel or thick steel plate welded together. It is used to fix the main pole commutation pole and cover, with the foot fixed to the motor based on the frame or a part of the magnetic circuit for the magnetic flux through the section known as the yoke, cover mainly play a supportive role , cover is fixed to the machine base, which is placed on the shaft bearing supporting DC motor, so that the DC motor to rotate

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