Yes, all DC motors have commutators.
The commutator of a DC motor is commonly known as a commutator, which is a component of a DC permanent magnet series motor in order to allow the motor to continue to rotate.
1 Composition: mechanical commutator, semi-plastic commutator, full-plastic commutator. The commutator used on the automobile starter mainly uses a mechanical arch commutator and a plastic commutator.
2 Principle: When the coil passes the current, it will rotate through the attraction and repulsion force under the action of the permanent magnet. When it turns to balance with the magnet, the original energized wire will be compared with the contact piece on the corresponding commutator. The brushes are separated, and the brushes are connected to the contact pieces corresponding to the set of coils that generate the driving force, so that the DC motor will start to rotate after repeating.
3 Function: Convert the DC current passing through the brush into the alternating current in the winding or convert the alternating electromotive force in the winding into the DC electromotive force on the brush end.
The commutator is a part of the DC permanent magnet series motor in order to allow the motor to continue to rotate.
Structurally, the commutator is a circle with several contact pieces, which are connected to each tap on the rotor. Two electrodes connected to the outside are called brush contacts, and only two of them are contacted at the same time.
The principle is that when the coil passes current, it will be rotated by the force of attraction and repulsion under the action of the permanent magnet. When it turns to balance with the magnet, the original energized wire will be compared with the contact piece on the corresponding commutator. The brushes are separated, and the brushes are connected to the contact pieces corresponding to the set of coils that generate the driving force, so that the DC motor will start to rotate after repeating.
If there is no function of the commutator, the motor can only be stuck in less than half a turn and can only be used as an electric brake.
The commutator is two copper half rings with a gap in the middle. Rely on the commutator to cooperate with the commutation action of the brushes to change the direction of the current.