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2. Alternator (automotive) - Wikipedia

   en.wikipedia.org/wiki/Alternator_(automotive)

   Efficiency reduces dramatically at high speeds mainly due to fan resistance. At medium speeds efficiency of today's alternators is 70–80%. [11] This betters very small high-performance permanent magnet alternators, such as those used for bicycle lighting systems, which achieve an efficiency around 60%. Larger permanent magnet electric ...

3. Alternator - Wikipedia

   en.wikipedia.org/wiki/Alternator

   An alternator that uses a permanent magnet for its magnetic field is called a magneto. Alternators in power stations driven by steam turbines are called turbo-alternators. Large 50 or 60 Hz three-phase alternators in power plants generate most of the world's electric power, which is distributed by electric power grids. [4]

4. Alternating current - Wikipedia

   en.wikipedia.org/wiki/Alternating_current

   The first alternator to produce alternating current was an electric generator ... The Ganz factory in 1884 shipped the world's first five high-efficiency AC ...

5. Flux switching alternator - Wikipedia

   en.wikipedia.org/wiki/Flux_switching_alternator

   Alternator with six-pole rotor. A flux switching alternator is a form of high-speed alternator, an AC electrical generator, intended for direct drive by a turbine.They are simple in design with the rotor containing no coils or magnets, making them rugged and capable of high rotation speeds.

6. Turbo generator - Wikipedia

   en.wikipedia.org/wiki/Turbo_generator

   Turbo generators are used for high shaft rotational speeds, typical of steam and gas turbines. The rotor of a turbo generator is a non-salient pole type usually with two poles. [5] The normal speed of a turbo generator is 1500 or 3000 rpm with four or two poles at 50 Hz (1800 or 3600 rpm with four or two poles at 60 Hz).

7. Linear alternator - Wikipedia

   en.wikipedia.org/wiki/Linear_alternator

   The simplest type of linear alternator is the mechanically powered flashlight (shake type). This is a torch (UK) or flashlight (USA) which contains a coil and a permanent magnet . When the appliance is shaken back and forth, the magnet oscillates through the coil and induces an electric current .