1882, British electrician James Gordon built a large two-phase alternator. Lord Kelvin and Sebastian Ferranti developed early alternators with frequencies ranging from 100 Hz to 300 Hz. 189 1 year, nikola tesla obtained the patent of high frequency alternator (15000Hz).
189 1 year later, power supply will be provided by multiphase alternator. Thereafter, the AC frequency of the alternator is usually designed between 16 Hz and 100 Hz, and it is used in conjunction with arc lamps, incandescent lamps or motors. According to the law of electromagnetic induction, when the magnetic field around a conductor changes, an induced current will be generated in the conductor. A rotating magnet is called a rotor, and a set of conductors fixed in a coil wound on an iron core is called a stator. When it passes through a magnetic field, it generates an electric current. The basic machine that generates alternating current is called alternator.
Extended data:
Development of alternating current;
1. In Japan, the Shizuoka tectonic line of Sakiyagawa is 50Hz east and 60Hz west. Shizuoka Prefecture and Nagano Prefecture are connected by three frequency conversion substations, and Honshu is connected with Hokkaido and Shikoku through submarine HVDC.
2. AC power is widely used in power transmission, because under the previous technical conditions, AC power transmission is more efficient than DC power transmission. The dissipation power of the current transmitted on the conductor can be calculated by Joule's law (P =I? R) It is found that it is obviously necessary to reduce the transmission current or the resistance of the conductor to reduce the energy loss.
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