Brush wear indicator

Patent metadata

Field	Value
Publication number	US-10079463-B2
Application number	US-201514946754-A
Country	US
Kind code	B2
Filing date	Nov 19, 2015
Priority date	Nov 19, 2015
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

An electric machine configured to increase resistance between a brush and a commutator of the electric machine at a wear condition of the brush consistent with end of service life.

First claim

The invention claimed is:

1. An electric machine configured to increase resistance between a brush and a commutator of the electric machine at a wear condition of the brush consistent with end of service life, the brush including an at least part annular interrupter body attached to a lead.

2. The brush as claimed in claim 1 wherein the body is annular.

3. A brush for an electric machine comprising:
a brush body;
an interrupter operable to cause a rise in resistance between the brush body and a commutator of an electric machine in which the brush is installed, when the brush is near an end of service life and wherein the interrupter causes the brush to bounce on the commutator.

4. The brush as claimed in claim 3 wherein the bounce is caused by the interrupter striking undercuts of the commutator.

5. The brush as claimed in claim 3 wherein the interrupter is embedded in the brush body.

6. The brush as claimed in claim 3 wherein the interrupter is a ball.

Assignees

• Remy Tech L L C
• Borgwarner Inc

Inventors

• Fulton David
• Dragon Andrew

Classifications

• H01R39/59

  Means structurally associated with the brushes for interrupting current (H01R39/58 takes precedence) · CPC title

• H01R39/58 Primary

  Means structurally associated with the current collector for indicating condition thereof, e.g. for indicating brush wear · CPC title