The commutation device is an important part of the DC motor, which converts the DC current passing through the brush into the alternating current in the winding or converts the alternating electromotive force in the winding into the DC electromotive force on the brush end. In the DC generator: the commutation device plays the role of ballast, that is, the alternating current in the armature winding is rectified into direct current, which is output at both ends of the positive and negative brushes; in the DC motor: the commutation device plays an inverting role, that is, the The direct current in the circuit outside the brush is converted into alternating current by the commutation equipment and input into the armature element. If you want to play the above role well, you can refer to the application tips listed by the following commutator manufacturers.
1. The rotor changes, the carbon brush does not move, and then the pair of contact pieces that are in contact each time is different, and then insists that he continue to rotate. When rotating together, one group of windings is energized in the forward direction, and the other group can be energized in the reverse direction to obtain more power. High power and power output.
2. Each group of windings of the components has at least one pair of contact pieces. If a multi-winding motor can share one contact piece with multiple windings, it is also possible. There are contact pieces and winding connections, and then there are carbon brushes on them.
3. If it is not equipped, then it cannot be commutated, so the current always flows through a winding, and the winding will not turn again after reaching the zero-crossing position, and it cannot be turned at all and cannot be twisted. Always energized at this time, the rotor will be burnt due to the small resistance.
4. Because the rotor of the commutation device keeps moving and the carbon brush does not move, when a certain group of coils of the rotor is now connected with the carbon brush to form a loop, because there is a magnetic field around the current-carrying conductor, it will turn, and this group will turn after the change. It will be powered off and then the next group will be powered on, so that it can continue to operate.