Patent · US Active

Brush for an electric machine, in particular of a motor vehicle, and method for determining wear of such a brush

US11329439B2 · kind B2 · utility

0Cited by

9References

8Claims

0Family size

Assignee

Bayerische Motoren Werke Aktiengesellschaft · DE

Inventors

Markus Laemmermann · Munich, DE
Robert Wagner · Munich, DE

Key dates

Filing date	Nov 7, 2019
Grant date	May 10, 2022
Priority date	—
Expiry date	Nov 7, 2039

Classification

Technology area (CPC H)Electricity
CPC primaryH02K7/006
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A brush for an electric machine includes at least one brush body having an electrical resistance, which is configured to electrically contact at least one component moving relative to the brush body during operation of the electric machine, and which sustains wear during the operation of the electric machine along a wear direction, as a result of friction contact with the component. The brush includes a detection device configured to determine wear of the brush body, where the detection device comprises a plurality of detection zones which are mutually spaced apart along the wear direction, the respective electrical resistance of which differs from the electrical resistance of the brush body.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.