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With the oldest direct current motor commutator technology in the world, this commutator is still the most commonly used worldwide for traction or for large commutators that cannot be molded.
With this technology, the commutator is installed by tightening two steel cones that constitute the hub, which is insulated from the commutator segments by two mica cones. The biggest advantage of this type of commutator is that it can be completely dismantled and then reassembled. Therefore, the entire copper segment pack can be changed after several “maintenance” grindings or an isolated repair can be carried out easily, for example, following segment movement.
This technology has virtually no size limits. In fact, mechanically welded-hub commutators can be produced that are several meters in diameter. However, it comes at a cost much higher than a molded commutator as its production, assembly and stabilization cannot be automated and are effectively performed manually.