The role of carbon brushes in electric motors What is the function of carbon brushes in generators

The function in the motor is to change the direction of the current to divide the DC motor and the AC motor, and the DC motor is to change the conductive coil of the rotor, thereby changing the rotor pole. Thus changing the motion of the motor. Carbon brush is used on the commutator or slip ring of the motor, as a sliding contact to export the induced current, it has good electrical conductivity, thermal conductivity and lubrication properties, and has a certain mechanical strength and commutation spark instinct.

Almost all motors use carbon brushes, which are an important component of the motor. The role of carbon brushes in motors 1An external current (excitation current) is applied to the rotating rotor by passing a carbon brush (input current) 2

The electrostatic charge on the large shaft is introduced to the ground through the carbon brush (grounded carbon brush) (output current) 3Change the direction of the current (in commutator motors, the brushes also play a commutation role) 4Lead the large shaft (ground) to the protection device for rotor grounding protection and measure the positive and negative voltage of the rotor to the ground The commutator is composed of brushes and commutation rings, and the carbon brush is a kind of brush.

Due to the rotation of the rotor, the brush is always rubbed against the commutation ring, and the electric spark will be burned at the moment of commutation, so the brush is a wearing part in the DC motor. In order to improve the service life and operation stability of DC motors, as well as reduce the noise and electromagnetic interference of DC motors, brushless DC motors have a tendency to gradually replace brushed motors. Generally, AC motors do not use constant magnetic fields, so there is no need for commutators, and there is no need for brushes; However, the volume of AC motors is generally relatively large.

The motors used in household appliances are generally AC motors, such as electric fans, washing machines, refrigerators, air conditioners, etc., but there are also DC motors, such as many electric shavers, small kitchen appliances, electric bicycles, etc. Motors that use dry cell batteries are DC motors.

The material of the carbon brush is mostly made of graphite, and in order to increase the electrical conductivity, it is also made of copper-containing graphite, which has good electrical conductivity, soft texture and wear resistance. Carbon brushes can be used in DC motors or AC commutator motors, such as general power tools, such as hand drills and angle grinders. It is used to cooperate with the commutator to achieve the current commutation of the motor, and the carbon brush is the sliding contact of the motor (except for the squirrel cage motor) to conduct the current.

In DC motors, it is also responsible for commutation (rectification) of the alternating electromotive force induced in the armature windings. Practice has proved that the reliability of motor operation is largely determined by the performance of brushes.

The role of carbon brushes in the motor is to change the direction of the current.

An external current (excitation current) is applied to the rotating rotor through a carbon brush (input current);

The electrostatic charge on the large shaft is introduced to the ground through the carbon brush (output current);

Lead the large shaft (ground) to the protection device for rotor grounding protection and measure the positive and negative voltage of the rotor to the ground;

Change the direction of the current (in commutator motors, the brushes also play a commutation role). Except for inductive AC asynchronous motors that do not. Other motors are available, as long as the rotor has a commutation ring.

Only the motor of the commutator or slip ring has carbon brushes, and ordinary AC asynchronous motors have a squirrel cage structure and no carbon brushes.

In order to ensure the normal operation of the motor, the mark of good performance of carbon brushes should be:

On the surface of the commutator or collector ring, a uniform, moderate and stable oxide film can be formed quickly.

Carbon brushes have a long service life and do not wear out commutators or collector rings.

The carbon brush has good commutation and current collection properties, so that the spark is suppressed within the allowable range, and the energy loss is small.

When the carbon brush is running, it is not too hot, the noise is low, the assembly is reliable, and it is not damaged.

Summary. Pro-<>

Overall, carbon brushes are a very important part of a generator, not only to generate current, but also to keep the rotor balanced, reduce vibration and noise, and help cool the rotor. <>

Therefore, when maintaining and maintaining the generator, it is necessary to regularly check and replace the carbon brushes to ensure the normal operation of the generator.

What is the purpose of the carbon brush of the generator.

Hello, as far as I know, the main function of the carbon brush of the generator is to generate an electric current in the generator, and by contacting the rotating rotor, the electric energy is transferred to the external circuit. <>

The part where the carbon brush is in contact with the rotating rotor is called the collector ring, and they transmit the current through the friction between the collector ring and the balance rotor.

In addition to generating positive current<>s in generators, carbon brushes also have some other functions. For example, they can help keep the rotor balanced, reducing vibration and noise. In addition, carbon brushes also help to cool the rotor, so the friction between them and the rotor generates heat, which helps transfer heat to the surrounding air.

<>In general, carbon brushes are a very important part of the generator, not only to generate current, but also to keep the rotor in balance, reduce vibration and noise, and help cool the rotor. <>

Therefore, when maintaining and maintaining the generator, it is necessary to regularly check and replace the carbon brush to ensure the normal operation of the generator.

1. Carbon brush is a device that transmits energy or signal between the fixed part and the rotating part of the motor or generator or other rotating machinery, it is generally made of pure carbon and coagulant, and the appearance is generally a square, stuck on the metal bracket, and there is a spring in the hand to press it on the rotating shaft.

2. When the carbon brush motor rotates, it will deliver the electric energy to the coil through the commutator, because its main component is carbon, it is called carbon brush, and it is easy to wear. Finally, regular maintenance and replacement should be carried out, and carbon deposits should be cleaned up.