Generator: DC generators, alternators, synchronous generators, generator asynchronous generator principle is mainly composed of stator, rotor, cap brush base and bearings and other components..
Stator from the base. Stator core, line winding, and other fixed structures composed of these parts.
Rotor from the rotor core, the rotor poles (magnetic choke. Pole winding), slip ring, (also known as copper rings. Collector ring), fan and shaft and other components.
Through the bearing, frame and cover the generator stator, a rotor assembly connected together, so that the rotor can rotate in the stator, a slip ring by a magnetizing current is passed through the rotor into a rotating magnetic field, the magnetic field lines of the stator coil to make the movement of the cutting , resulting EMF, leads through the terminal, then in the loop, they produce a current. Because of the brushes and has a circuit connected to the rotor at the rotor is rotated in a certain direction, for generating an alternating current circuit, so the family is an alternating current circuit, referred to as alternating current. Output current of the grid frequency is 50 Hz.
Turbine generator and steam turbine generators. In order to obtain higher efficiency, generally made of a high-speed turbine, typically 3000 revolutions / minute (frequency of 50 Hz), or 3600 revolutions / min (frequency of 60 Hz). Nuclear power plants in the lower turbine speed, but also in 1500 rev / min or more. In order to reduce the high-speed turbine generator due to mechanical stress and to reduce the centrifugal force generated by wind abrasion, the diameter of the rotor is generally made smaller, the length is relatively large, i.e., the use of elongated rotors. Especially in 3000 r / min or more large-capacity high-speed unit, the relationship between material strength, the rotor diameter is strictly limited, generally not more than 1.2 m. The length of the rotor body has limited critical speed. When more than six times the diameter of the body length, the second critical speed of the rotor will be close to the operating speed of the motor, running a large vibration may occur. Therefore, the size of large high-speed turbo-generator rotors are strictly limited. 100,000 kilowatts or so air-cooled motor rotor size has reached its limit size above, again increasing the motor capacity only by increasing electromagnetic load motor to achieve. So we must strengthen the cooling of the motor. So 5 to more than 100,000 kilowatts of cooling turbine generator have adopted better hydrogen-cooled or water cooled technology. Since the 1970s, the maximum capacity turbo-generator has reached 130 to 1.5 million kilowatts. Since 1986, made a major breakthrough in high critical temperature superconducting materials research areas. Superconducting technology is expected to be applied in the turbine generator, which will produce a new leap forward in the history of the development of turbine generator.