A commutator is made of copper segments. The segments have a tapered form
and are made of electrolytic copper (E-Cu) or profile copper (Cu-Ag).
These copper segments are placed in a circle and insulated from each other
by sheets of mica.
The segment ring can be connected in various ways with a supporting steel
• Swallowtail construction:
A steel core with a negative swallowtail
is completely insulated from the copper segment ring, which has a positive
• Construction with bandages:
A cylindrical, insulated steel part on which the copper is attached with:
Steel rings at the ends and/or the middle.
A combination of the two.
• Floating constructionWithout steel
core but with steel rings insulated internally from the copper.