1. When installing or maintaining the generator set, due to reasons such as unqualified clearance of the rotor and stator, bearings and dynamic balance of the rotor, the vibration of the unit during operation exceeds the standard, resulting in vertical vibration or horizontal vibration of the generator rotor exceeding the standard or because the ellipticity of the rotor slip ring is not qualified, the movement trajectory of the brush in the slip ring is not not a regular circle, which results in brush bounce, caused by mechanical vibrations. the reasons.
2. When the smoothness of the rotor slip ring due to external factors is between ▽1 and ▽7, if the smoothness is too bad, it will increase the contact resistance of the brushes, causing the brushes to ignite and spark prolonged. .
3. Brush compression spring pressure caused by brush fatiguecomes out or the overheating is too low, which will result in intermittent weak sparking caused by lack of treatment in time for a long time. surface of the slip ring. The oxide film is damaged, causing severe sparking on the brush.
4. During the installation or maintenance process, if the distance between the brush holder and the slip ring exceeds the standard or the gap between the brush and the brush holder is too large, the brush will oscillate in the direction of the speed. frame, which will cause not only noise but especially sparks.
5. The brush compression spring is blocked due to non-vertical pressure or welding, resulting in uneven shunting of the brushes, resulting in brush ignition.
6. Brush pressure is incorrectly adjusted during normal operation, causing the brushes to shunt unevenly, resulting in the brushes turning on.
Method oftreatment: If the pressure of the brush compression spring is too large or too weak and the brush shunt is uneven, the pressure of the compression spring should be adjusted appropriately. The material of the brush compression spring. The main requirement is to subject the brushes to uniform and stable pressure. The pressure difference between each brush must not exceed its average value + 10%. Brushes will continually wear during operation.
The brush spring should also be adjusted accordingly to try to keep the brush pressure virtually unchanged. Frequently checking the operational status and activity of the brush is an effective measure to ensure normal operation of the brush.
Detailed information
In order to ensure normal operation of the motor, it is very important to correctly select the brush model, because the materialsRaw materials used in the manufacture of brushes. Different processes have different technical performances. Therefore, when selecting a brush, the performance of the brush and the motor requirements for the brush should be carefully considered.
Signs of good brush performance should be: the brush has a long life and does not wear the commutator or collector ring; the brush has good switching and current collection performance, suppressing sparks within the allowed range. , and the energy loss is small; When the brush works, it does not overheat, the noise is low, the assembly is reliable, and it is not damaged.
The brush should be installed in the brush holder to ensure that it can move up and down freely. The space between the brush and the inner wall of the brush holder is 0.1-0.3mm to avoid excessive gaps. inbe the brush and the broom holder. The distance between the bottom edge of the brush holder and the commutator surface should be kept approximately 2 mm. If the distance is too small, the brush holder can easily touch the commutator; if the distance is too great, the broom may vibrate and cause damage.
Baidu Encyclopedia - Carbon Brush
Baidu Encyclopedia - Slip Ring Brush
What's wrong with old carbon brushes that produce sparks in small motors
Vacuum cleaners generally use series or compound excitation motors, the rotation The speed is relatively high, usually thousands to tens of thousands of revolutions. It is normal for the carbon brush to spark slightly. If the sparking is serious, you need to check whether the carbon brush is seriously worn or whether the brush spring is broken or. The armature and commutator have insufficient elasticity. Is there an malfunction?
What are the consequences of sparking from generator carbon brushes?
Slight sparks from the carbon brushes of the generator have no effect if not dealt with in time, the sparks will become bigger and bigger. causing significant heat and burning. Defective carbon brushes and slip rings can cause the field circuit to be interrupted or the brush holder to burn out.
How to solve motor carbon brush sparking problem
Whether the generator is DC or AC, if the DC generator carbon brush sparks, it means that the electric coil is short-circuited. circuited. Find the short and separate it. If the alternator carbon brush sparks, it means that it is difficult to replace the carbon brush. It is also possible that the copper ring in front of thecarbon brush is too dirty. Just sand it with sandpaper and you'll be fine.
Why do carbon brush tools spark?
Carbon brush tools are switched using carbon brushes. When working, electricity passes through the carbon brushes to each winding.
What are the consequences of a spark on the motor carbon brush?
Burn the coil and cause partial damage by short circuiting the coil. . . . . . . . .
How to deal with generator carbon brush sparking?
Whether the generator is direct current or alternating current, if the carbon brush of the DC generator produces sparks, it means that the electric coil is short circuited. Find the short and separate it, okay! If the alternator carbon brush sparks, it means that it is difficult to replace the carbon brush. It is also pPossible that the copper ring in front of the carbon brush is too dirty. Just sand it with sandpaper and you'll be fine.
Engine ignition problem?
The engine ignition problem persists. The electrician cleaned the commutator and replaced the carbon brushes several times. After each repair it got slightly better, but over time. passes, the sparks gradually increase, and the sparks cannot be eliminated. Today, I replaced a motor of the same model and observed the parameters of 590. The speed setting is 87%, the current is 52%, and the armature voltage can rise to 400V. It turns out that at the same speed, when producing the same type of cable, the current reaches 59%, and the armature voltage can reach 350 V. Is it possible to diagnose a problem with the motor rotor ?
How to handle the “motor carbon brush sparks” fault?
There aremany reasons why the motor carbon brush sparks. Generally, replace the carbon brush, arrange the changer, adjust the brush holder, etc. If you don't have the capacity, you can send it to us for repair.
The motor's carbon brushes often spark. Carbon brushes are easy to burn out. How to solve the problem ? Thank you for your question.
Clean the powder on the collector and. make the carbon brush contact area smooth and smooth, the front and rear bearings should be replaced if the gap is too large.
Why did one side of the motor spark after replacing the carbon brush?
There is a jam between the carbon brush and the brush housing and the brush housing cannot slide freely. loose.Motion, incorrect position, carbon brush contact surface unpolished