The non-drive end shaft jump of the generator is relatively large, causing the collector ring to collide with the carbon brush and ignite.
The contact surface between the carbon brush and the collector ring is damaged and ignites with the collector ring.
The surface roughness of the collector ring is too large and sparks with the carbon brush.
When the carbon brush is installed, the contact surface and the collecting ring surface are offset. A part of the carbon brush is not worn and forms a blade shape, which cuts into the terminal in the collecting ring (cuts the insulating sleeve), causing the rotor winding Short circuit and unbalanced current will burn out the collector ring.
The lead nut of the collector ring is not tightly tightened, and the lead is loose and short-circuited with other leads.
Foreign matter enters the collector ring chamber, causing a short circuit or damaging components, causing the collector ring to ignite or causing the rotor to stall (friction reduces the speed).
The spring of the carbon brush holder is defective. After the carbon brush is worn, it does not reach the appropriate contact position with the collector ring, causing one phase of the winding to be disconnected (or the current is unbalanced).
The metal nut at the winding lead end fell off and came into contact with the collector ring or other electrical components.
The collector ring itself is of poor quality, the insulation resistance is not up to standard, and the insulation weakens during operation, causing partial discharge.
All of the above situations can cause burning damage to the collector ring, but some problems can be avoided, and some problems require timely and regular inspections. For reference.
A megawatt-class wind turbine can produce about 1 kilowatt of electricity in one revolution.
A wind turbine is a device that converts wind energy into electrical energy. It is mainly composed of blades, generators, mechanical components and electrical components. Depending on the axis of rotation, wind turbines are mainly divided into two categories: horizontal axis wind turbines and vertical axis wind turbines. Currently, horizontal axis wind turbines occupy the mainstream position on the market.
The principle of wind power generation is to use wind power to drive the windmill blades to rotate, and then use a speed increaser to increase the speed of rotation to prompt the generator to generate electricity. According to current windmill technology, power generation can start at a breeze speed of about three meters per second (the level of breeze).
Extended information:
Small wind power systems are very efficient, but they are not just It consists of a generator head, but a small system with certain technological content: wind turbine + charger + digital inverter. The wind turbine consists of a nose, a rotor, a tail, and blades. Every part is important, and the functions of each part are: the blades are used to receive wind power and convert it into electrical energy through the nose; the tail allows the blades to always face the direction of the wind to obtain maximum wind energy; the rotor allows the nose to rotate flexibly to achieve The tail has the function of adjusting the direction; the rotor of the nose is a permanent magnet, and the stator winding cuts the magnetic lines of force to generate electrical energy.
For a 1.5MW wind turbine, the generator rotates about 1,800 times a minute, generates 1,500 kilowatt-hours of electricity per hour, and the impeller rotates about 18 times a minute. This is directly related to the size of the unit. Generally speaking, level 3 winds are valuable. However, from an economic and reasonable point of view, the wind speed is greater than4 meters per second is suitable for generating electricity.
According to measurements, a 55-kilowatt wind turbine has an output power of 55 kilowatts when the wind speed is 9.5 meters per second; when the wind speed is 8 meters per second, the power is 38 kilowatts; the wind speed When the wind speed is 6 meters per second, it is only 16 kilowatts; when the wind speed is 5 meters per second, it is only 9.5 kilowatts. It can be seen that the stronger the wind force, the greater the economic benefits.