The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 05, 2022
Filed:
Dec. 16, 2020
Borgwarner Inc., Auburn Hills, MI (US);
Michael E. Kirk, Anderson, IN (US);
BorgWarner Inc., Auburn Hills, MI (US);
Abstract
An electric machine having a field coil and a rotatable armature coil. A rotatable commutator is conductively coupled with the armature coil and has a plurality of contacts. A plurality of brushes are conductively engageable with the plurality of contacts wherein rotation of commutator about the rotational axis causes the plurality of contacts to sequentially engage the plurality of brushes as the plurality of contacts rotate about the rotational axis. The plurality of brushes includes at least one positive brush and at least one negative brush, the at least one positive brush being a multi-layer brush and the negative brush being a single layer block brush. The multi-layer brush may include a high-copper layer and a low-copper layer with the low-copper layer forming the trailing edge of the brush. The single layer brush may have a copper content greater than the high-copper layer of the multi-layer brush.