V-Bound Commutators

 

V-bound commutators are named for the internal v-shaped configuration that retains the copper bars and mica segments. The copper bar and mica segment pack is bored with a v-shaped groove on each end of the pack. The most common angles for these commutators are 3 degrees on the outer angle and 30 degrees on the inner angle.

Mica v-rings are made to fit inside the v-grooves on the copper and mica segment pack. The mica v-rings are used as electrical insulation between the copper segments and the steel parts. The steel parts are machined with protruding v-shaped end caps that will mate precisely with the v-shaped grooves in the copper bars and mica v-rings. The entire assembly is held together with a ring nut on smaller commutators. For most commutators above approximately a 10 inch brush diameter, bolts or studs are used instead of a ring nut.

 

One of the advantages of a V-bound commutator is that it can be taken apart to replace copper, replace mica v-rings or clear electrical problems easier than other styles. Depending on the design of the unit, some v-bound commutators can be re-insulated. This involves replacing the mica segments between the copper bars, replacing the mica v-rings and re-using the copper bars.

 



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