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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]
Musical symbols are marks and symbols in musical notation that indicate various aspects of how a piece of music is to be performed. There are symbols to communicate information about many musical elements, including pitch, duration, dynamics, or articulation of musical notes; tempo, metre, form (e.g., whether sections are repeated), and details about specific playing techniques (e.g., which ...
Relating to music produced by instruments, as opposed to electric or electronic means ad libitum (commonly ad lib; Latin) At liberty (i.e. the speed and manner of execution are left to the performer. It can also mean improvisation.) adagietto Fairly slowly (but faster than adagio) adagio Slowly adagissimo Very, very slowly affannato, affannoso ...
Dynamos and alternators require a source of power to drive their field coils. This could not be supplied by their own generator's output, without some process of ' bootstrapping '. Henry Wilde , an electrical engineer from Manchester, England, developed a combination of magneto and electro-magnet generator, where the magneto was used only to ...
In a moving magnet cartridge, the stylus cantilever carries a tiny permanent magnet, which is positioned between two sets of fixed coils (in a stereophonic cartridge), forming a tiny electromagnetic generator. As the magnet vibrates in response to the stylus following the record groove, it induces a tiny current in the coils.
magnet wire The class of wire manufactured for winding electromagnetic coils such as in motors or transformers. magnetic blowout A component of a switching device that uses a magnetic field to assist in extinguishing the arc, using a permanent magnet or a coil. magnetic circuit A path through which magnetic flux passes. magnetic constant
Alternator of 1930s diesel generating set, with excitation dynamo above. For large, or older, generators, it is usual for a separate exciter dynamo to be powered in parallel with the main power generator. This is a small permanent-magnet or battery-excited dynamo that produces the field current for the larger generator.
The rotating magnetic field is the key principle in the operation of induction machines.The induction motor consists of a stator and rotor.In the stator a group of fixed windings are so arranged that a two phase current, for example, produces a magnetic field which rotates at an angular velocity determined by the frequency of the alternating current.