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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. Motor–generator - Wikipedia

   en.wikipedia.org/wiki/Motor–generator

   An Alexanderson alternator is a motor-driven, high-frequency alternator which provides radio frequency power. In the early days of radio communication, the high frequency carrier wave had to be produced mechanically using an alternator with many poles driven at high speeds. Alexanderson alternators produced RF up to 600 kHz, with large units ...

4. Alternator - Wikipedia

   en.wikipedia.org/wiki/Alternator

   A brushless alternator is composed of two alternators built end-to-end on one shaft. Until 1966, alternators used brushes with rotating field. [20] With the advancement in semiconductor technology, brushless alternators are possible. Smaller brushless alternators may look like one unit, but the two parts are readily identifiable in the large ...

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. Magnetic amplifier - Wikipedia

   en.wikipedia.org/wiki/Magnetic_amplifier

   Magnetic amplifiers were also used to regulate the speed of Alexanderson alternators to maintain the accuracy of the transmitted radio frequency. [2] Magnetic amplifiers were used to control large high-power alternators by turning them on and off for telegraphy or to vary the signal for voice modulation. The alternator's frequency limits were ...

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