Main circuit generator

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Main circuit excitation (self-excitation)

The design of an electrical generator in which the entire armature current ( main current ) is used to excite the field magnets is referred to as a main circuit generator or series circuit generator . The armature and field windings are connected in series .

history

Schematic representation

Siemens ' first generator to work on the dynamo-electric principle was a main circuit generator .

definition

The main circuit generator , like the shunt generator, can excite itself. Its excitation winding is connected in series with the armature. In the main circuit generator , as long as there is no load ( no load ) on the generator and no excitation current is flowing, the voltage is caused by the residual magnetism (remanence). However, if the generator is loaded, the voltage increases. These generators are not often used alone in technology, since their voltage increases with load. However, there is a combination of secondary and main generator circuit, the double wound generator (generator compound) is called. This type of generator can work alone as a generator drive , z. B. for braking.

disadvantage

However, it is disadvantageous that the voltage of a main circuit generator depends very strongly on the respective load and thus on the current strength . When the circuit is open , the voltage drops to zero volts because the stator is no longer traversed by the current . Because of this dependence of the terminal voltage U k on the load, main circuit generators are almost no longer used.

See also

literature

  • Hans-Ulrich Giersch, Hans Harthus, Norbert Vogelsang: Electrical machines. Testing, standardization, power electronics. 5th edition. Vieweg + Teubner Verlag, 2003, ISBN 3-519-46821-2 , pp. 119–121, 125/126, 387 ( limited preview in Google book search).
  • Herbert Bernstein: Electrical engineering / electronics for mechanical engineers. Vieweg + Teubner Verlag, 2004, ISBN 3-528-03969-8 , pp. 293, 295, 356 ( limited preview in the Google book search).
  • Karl Küpfmüller, Wolfgang Mathis, Albrecht Reibiger: Theoretical electrical engineering. An introduction. 18th edition. Springer Verlag, 2008, ISBN 3-540-78589-2 , p. 482 ( limited preview in the Google book search).
  • Gerd Fehmel, Peter Behrends: Electrical machines. The master's examination. 13th edition. Vogel Buchverlag, 2004, ISBN 978-3-8023-1981-5 , p. 232.

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