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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.:

US 9472989 B1

PDFFull Text
Date of Patent:
Oct. 18, 2016

Filed:

Aug. 26, 2014

Method of manufacturing a power tool with molded armature

Applicant:

Black & Decker Inc., Newark, DE (US);

Inventors:

Hung T. Du, Reisterstown, MD (US);

Brandon L. Verbrugge, Brookfield, WI (US);

Joshua F. West, Towson, MD (US);

Michael R. Sell, Bel Air, MD (US);

Richard T. Walter, Baldwin, MD (US);

David J. Smith, Columbia, MD (US);

Earl M. Ortt, Towson, MD (US);

John C. Stone, Cordova, MD (US);

Howard T. White, Cedar Grove, TN (US);

Assignee:

Black & Decker Inc., New Britain, CT (US);

Attorney:

Amir R. Rohani

Primary Examiner:

Minh Trinh

Int. Cl.
CPC ...
B29C 45/00 (2006.01); H02K 3/30 (2006.01); H01R 43/10 (2006.01); H02K 7/04 (2006.01); H02K 15/12 (2006.01); H02K 15/16 (2006.01); H02K 3/48 (2006.01); H02K 15/00 (2006.01); H02K 15/02 (2006.01);
U.S. Cl.
CPC ...
H02K 3/30 (2013.01); H01R 43/10 (2013.01); H02K 3/48 (2013.01); H02K 7/04 (2013.01); H02K 15/12 (2013.01); H02K 15/165 (2013.01); H02K 15/0056 (2013.01); H02K 15/02 (2013.01); Y10T 29/49009 (2015.01); Y10T 29/49011 (2015.01); Y10T 29/49012 (2015.01); Y10T 29/49071 (2015.01); Y10T 29/49073 (2015.01); Y10T 29/49075 (2015.01); Y10T 29/49995 (2015.01); Y10T 29/49996 (2015.01);
Abstract

A method of manufacturing an armature for an electric motor, includes: placing a commutator and a lamination stack on an armature shaft, winding magnet wire in slots in the lamination stacks to form coils, attaching ends of the magnet wire to the commutator, and molding plastic around the magnet wire and around the shaft of the armature at ends of the lamination stack. A spinning inertia of the armature is adjusted by adjusting at least one of a mass of the plastic molded and a distribution of the plastic molded. Alternatively and/or additionally, at least one of a resonant frequency and critical speed of the armature is adjusted by adjusting at least one of a geometry of the plastic molded, the physical properties of the plastic and the mechanical properties of the plastic.

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