Compensation winding

from Wikipedia, the free encyclopedia

The compensation winding is a component in DC machines . Its purpose is to counteract the anchor reaction , which causes a distortion of the main pole field.

The current in the armature produces a magnetic field which comprises the main pole generated magnetic field influences. It is directed across the main pole field so that it weakens the field on one side of the main pole and increases it on the other. The result is a displacement of the main pole field to a main pole edge. The displacement causes a field weakening, as saturation occurs in the pole in the area of ​​the field compression. As a result, different armature windings are penetrated by magnetic fluxes of different sizes. This results in different induction voltages in the individual armature winding parts and voltage differences between adjacent lamellas of the collector (also known as the commutator). These web stresses increase with the field distortion and armature speed. Bridge voltages from approx. 35 volts can lead to arcing between the lamellas and damage the collector.

The task of the compensation winding is to correct the field distortion in the area of ​​the main poles.

The strength of the distortion of the main pole field depends on the armature current and also on its current direction. Usually the compensation winding is connected in series to the armature in such a way that it counteracts the armature magnetic field. An exception are e.g. B. represent welding generators in which the compensation winding is switched against the exciter winding (counter-compounded) in order to cause a decrease in voltage with increasing load.

Compensation windings are usually used in large electrical machines that also have a reversing pole winding and are operated with different loads.

literature

  • Günter Boy, Horst Flachmann, Otto Mai: The master's examination in electrical machines and control technology. 4th edition, Vogel Buchverlag, Würzburg, 1983, ISBN 3-8023-0725-9
  • Günter Springer: Expertise in electrical engineering. 18th edition, Verlag Europa-Lehrmittel, Wuppertal, 1989, ISBN 3-8085-3018-9