The structure and working principle of generator
Generator is usually stator, rotor, cover. Stand and bearings and other components constituted.
Stand by the stator. Stator core, the line winding pack, as well as those parts of the fixed composition of the other structural parts.
Rotor from the rotor core (with magnetic brief. Pole winding) slip ring, (also known as copper rings. Collector ring). Fan and shaft and other parts.
From the bearing and cover the generator stator and rotor assembly connected together, so that the rotor can rotate in the stator and do cutting movement of magnetic field lines, resulting in induction electric potential, through the terminal leads, then in the loop, it produces a current.
Turbo-generator and steam turbine generator package. In order to obtain high efficiency, generally made of high-speed turbine, usually 3000 r / min (frequency 50 Hz) or 3600 r / min (frequency 60 Hz). Nuclear power plants in the lower turbine speed, but also 1500 rev / min or more. High-speed turbo-generator in order to reduce the centrifugal force generated due to mechanical stress and reduce the consumption of air friction, rotor diameter and generally doing relatively small, the length of relatively large, that is, using thin rotor. Especially in the 3000 r / min or more large-capacity high-speed unitsdue to the relationship between the strength of materials, rotor diameter and are strictly limited, generally can not exceed 1.2 meters. The length of the rotor body has been critical speed restrictions. When the body length above 6 times the diameter of the rotor of the second critical speed would be closer to the motor running speed, running a large vibration may occur. Therefore, the size of large high-speed turbo-generator rotor subject to strict restrictions. Of about 100,000 kilowatts of its rotor size of air-cooled motor has reached the limits of the above-mentioned dimensions, again increased electrical capacity, only by increasing the electromagnetic motor load to achieve. So we must strengthen the motor cooling. So, 5 to 10 million kw of the turbo-generator have adopted the cooling effect of a good hydrogen-cooled or water-cooled technology. 70 years since the turbo has reached the maximum capacity of 130 to 150 kilowatts. Since 1986, the high critical temperature super-conductive materials research has made a major breakthrough. Superconducting technology is expected to be applied in the turbine-generator, which will turbo-generator to generate a new history of the development leap.