Graphite commutator

Abstract

The invention discloses a graphite commutator, which comprises bakelite (1), commutator bars (2) and graphite sheets (3), and is characterized in that the bakelite (1), the commutator bars (2) and the graphite sheets (3) are injected and molded integrally; each commutator bar (2) is of an L-shaped structure; a projected bolt (5) is arranged on an inner side of each commutator bar (2); a flanging hooked pin (4) is arranged on an upper end of each commutator bar (2); an inserted pin (6) is arranged on a lower end of each commutator bar (2); the graphite sheets (3) are totally surrounded by the bakelite (1), and fixed with the commutator bars (2) to form an integral structure; and compact first grooves (7) are arranged on the graphite sheets (3), and are consistent with the inserted pins (6) in shape. According to the invention, through combination innovation of structures of the commutator bars and the graphite sheets and a connection relationship thereof, the graphite commutator with low cost, uneasy-to-damage graphite sheets, long service life, and strong effective grasping force among the graphite sheets, the commutator bars and the bakelite after forming is provided.

Description

technical field [0001] The invention relates to a commutator used in a motor, more specifically to a graphite commutator. Background technique [0002] The commutator is a part of the DC permanent magnet series motor in order to allow the motor to continue to rotate. The graphite commutator is generally composed of copper commutator, graphite sheet and bakelite powder. Milling grooves are set on the graphite sheet, the copper commutator is installed on the graphite sheet, and the bakelite powder is filled with the whole composed of graphite sheet and copper commutator sheet. Since graphite sheet is a brittle item, the edge or water chestnut of graphite sheet is brittle during transportation. At the same time, in the process of welding the graphite sheet and the copper commutator piece, due to the insufficient force between the graphite sheet and the copper commutator piece, the effective gripping force of the graphite sheet, the copper commutator piece and the bakelite is r...

AI Technical Summary

Problems solved by technology

At the same time, in the process of welding the graphite sheet and the copper commutator piece, due to the insufficient force between the graphite sheet and the copper commutator piece, the effective gripping force of the graphite sheet, the copper commutator piece and the bakelite is relatively small. , when in use, the various parts of the graphite commutator are easy to loose, which affects its service life

And the general graphite commutator in the prior art does not effectively solve the above problems

For example, Chinese Patent Publication No. CN 1723593 A, published on January 18, 2006, the name of the invention is a planar commutator. The structural innovation of welding after the contact rings are clamped without gaps effectively solves the problem of the current density distribution of the planar commutator when the conductor part is converted to the carbon part, but the ring-shaped bump of the patented carbon part is easy to transport. Brittle, and the conductor part and the carbon part are formed by welding the ring-shaped bump and the contact ring, and the connection strength is low

Another example is Chinese Patent Publication No. CN 1929216 A, published on March 14, 2007. The name of the invention is a kind of embedded graphite commutator. This patent discloses a commutator. Graphite sheet and its structural innovation have achieved strong adhesion between the graphite sheet and the body, and solved the problem that the graphite sheet is easy to move radially and axially on the body, but the dovetail-shaped protrusions of the graphite sheet are brittle during transportation. Moreover, the graphite sheet and the body are fixed by conductive glue, and the connection strength is low. During long-term use, the graphite sheet and the body are easy to loosen or even detach.

Another example is the Chinese patent authorization announcement number CN 201066757 Y, the authorization announcement date was May 28, 2008, the name of the invention is graphite commutator, the application discloses a commutator, through the extended structure of the copper base frame And the combined use of the graphite sheet edge surrounded by the copper base frame effectively solves the problem that the graphite sheet edge is surrounded by bakelite powder, which is easy to cause the graphite sheet edge to break, but there is no connection between the graphite sheet and the copper base frame And fixed structure, in long-term use, the graphite sheet is easy to loosen, or even detached from the copper base frame, losing its electrical conductivity

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