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Carbon Brush Electrode Situation And Introduction

Aug 30, 2017

Carbon Brush electrode situation and introduction
     Carbon Brush electrode situation and description: Carbon Brush is the motor or generator or other rotating machinery and the rotating part of the transfer between the energy or signal transmission device, it is generally made of pure carbon coagulation agent, the appearance is generally box , Stuck in the metal bracket, there is a spring to press it on the shaft, such as oil drilling is completed, the need for testing, it is necessary to put the instrument from the wellbore, that is, through the Carbon Brush signal from the rotating part of the cable (cable Roller) to the ground instrument.
 The look of the Carbon Brush is like a rubber band with a pencil, and there is a wire on the top. The volume is very small. Carbon Brushes as a sliding contact, in many electrical equipment has been widely used. Product materials are mainly electro-graphite, dipped in graphite, metal (including copper, silver) graphite.
Carbon Brush for a variety of motors, generators, wheel machine. Has a good commutation performance, long service life.
Carbon Brush is used in the commutator or slip ring of the motor, as the sliding contact body for the introduction of the introduction current, it is conductive, thermal and lubrication performance is good, and has a certain mechanical strength and commutation spark instinct. Almost all motors use Carbon Brushes, which are important components of the motor. Widely used in a variety of AC and DC generators, synchronous motors, battery DC motor, crane motor assembly ring, all types of welding machines and so on.
 Carbon Brush was burning, then wrapped with fine gauze wrapped in the commutator above the gently polished, incidentally with the commutator slot with a piece of chip to clean up, then the commutator also wrapped with gauze gently polished The Do not let the motor commutator beating, Carbon Brush will not fire, do not fire the heat will be very small Carbon Brush spring will not burn soft, will not produce a vicious circle.
   A brush is a device that transfers energy or signals between a fixed part of a motor or generator or other rotating machine and a rotating part. Three major causes can cause Carbon Brush failure:
1, the temperature is too high: Carbon Brush oxide film is generally easy to form around 70 ℃, when the collector ring, Carbon Brush overheating failure, usually more than 150 ℃ temperature, then even if the new Carbon Brush, the oxide film easy to form , Can not play a role in lubrication, Carbon Brush wear will intensify, leading to temperature following
2, contaminated impurities in the cooling air: impurities in the air on the Carbon Brush surface oxide film formation will have a negative impact, these impurities include: sulfide or halogen element corrosive gases, air oil and gas mixture, dust, iron, Rust, dust, toner and other impurities. Carbon Brush wear, it will produce toner dust impurities, can be used to brush the cooling fan ventilation fan cooling channel to install the filter device to improve the air quality inside the brush cover.
3, the air humidity is too low or too low oxygen content: Carbon Brush surface oxide film formation requires a certain amount of moisture in the air, that is, air humidity can not be too low, but too high. In addition, the formation of oxide film mainly with oxygen in the air oxidation occurs, when the oxygen content is too low to facilitate the formation of oxide film.
   These three reasons are the main cause of the failure of the Carbon Brush, the schedule work attention to these three points, it is possible to avoid some failures.
The Carbon Brush is an important component of the motor and is responsible for conducting current between the rotating part and the stationary part. More fitted in the commutator or slip ring, is a sliding contact body [1]. Need to have a smooth, wear-resistant, good conductivity and other characteristics. Due to more made of graphite, it is also known as Carbon Brush. Depending on the application, they are either partially metal parts (copper, silver, molybdenum), rich or entirely made of metal.
The Carbon Brush is placed on the center line of the pole, but the Carbon Brush should be placed on the geometric centerline of the motor. If the Carbon Brush deviates from the geometric centerline, the magnetic field generated by the rotor windings (armature windings) The magnetic field generated by the stator windings (field windings), ie, the direct axis armature reaction and the cross armature reaction, cause the synthetic magnetic field in the space to be distorted, which affects the normal operation of the motor and reduces the efficiency. So the Carbon Brush should be placed on the geometric centerline. Where the geometric center line is located in the stator magnetic field of the magnetic pole center line, the stator pole has several pairs, the corresponding geometric center line there are several.