The working process and basic principle of DC motor commutator

Update:02 Jun 2020

Nowadays, various mechanical equipments are used in many places in our lives. We often use motor equipment in automobiles. We all know that the commutator is a part of the motor equipment. When the commutator is working, its speed will help the production activities. When using the motor, we have already understood some of the use matters, including some knowledge of the use of the motor commutator. When we use the motor commutator, we also need to understand some of its content. As our commonly used motor commutator, I believe everyone is curious about the work flow of the DC motor commutator. Let us take a look. .

No DC voltage is applied to the brush, and the armature is dragged by the prime mover to rotate it at a constant speed in a counterclockwise direction, and the magnetic force lines under the magnetic poles of different polarities are cut on both sides of the coil, and the electromotive force is induced in it. determine. Because, during the rotation of the armature, no matter where the armature is turned, due to the commutation of the Changzhou DC motor commutator, the electromotive force drawn by the brush through the commutator is always the coil that cuts the N pole magnetic field lines The electromotive force in the side, therefore, the brush always has a positive polarity. The working principle of the commutator is to convert the alternating electromotive force induced in the armature coil to the DC electromotive force when the commutator cooperates with the commutation of the brush to lead it from the brush end. The DC voltage is added to the two brush ends of the DC motor, and the electrical energy is input into the armature. The mechanical energy is output from the motor shaft, and the production machinery is dragged to convert the electrical energy into mechanical energy to become an electric motor.

The basic principle of DC motor commutator

We all know that there is a commutator in the motor equipment, which is part of the normal operation of the motor. There are many clicks used in our work. Therefore, the market demand for motor commutator is also great. There are many different motor commutators around us. The DC motor commutator is a part that we commonly use at work. We must first understand more about it.

The DC motor commutator is composed of a commutation ring, which is one kind. Due to the rotation of the rotor, the brush always rubs against the commutation ring, and at the moment of commutation, electric spark corrosion will also occur, so the brush is a wearing part in DC. In order to improve the service life, running stability of DC motors, and reduce the noise and electromagnetic interference of DC motors, brushless DC motors have a tendency to gradually replace brushed motors. There are two types of AC asynchronous motors: general factory uses a larger starting load Winding asynchronous motors have electric (carbon) brushes (such as cranes, steel rolling motors, etc.), and squirrel cage induction motors that start at light loads have no slip rings, so they do not need electric (carbon) brushes (such as electric fans). , Washing machine, air conditioner, refrigerator, etc.). DC motors are available, so use electric (carbon) brushes.

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