Method of making an armature

Details Method of making an armature Method of making an armature

2011-03-22

2011-03-22

Banks, Derris H (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C029S596000, C029S592000, C029S598000, C029S605000, C029S733000, C310S043000, C310S215000, C310S235000

Reexamination Certificate

active

07908736

ABSTRACT:
An armature for an electric motor has a lamination stack on a shaft with a commutator mounted on one end of the shaft. Magnet wires wound in slots in the lamination stack, the commutator and armature shaft are at least partially encapsulated in thermoset. The commutator has a commutator ring divided into a plurality of segments with slots between the segments that are filled with a second plastic when the commutator is made by molding a core of the second plastic, such as phenolic, in the commutator ring before the commutator ring is mounted on the armature shaft. Prior to molding the thermoset, the commutator ring is sealed. The seal prevents the thermoset from flowing into the slots between the commutator ring segments or over the commutator ring.

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