David W Gillespie

US Patent:

20130270934, Oct 17, 2013

Filed:

Jun 17, 2013

Appl. No.:

13/919352

Inventors:

David J. Smith - Columbia MD, US
Justin Ayers - Timonium MD, US
David E. Gillespie - Baltimore MD, US
Eric E. Hatfield - Anthem AZ, US
Earl M. Ortt - Towson MD, US
Stephen Osborne - Pikesville MD, US
Brian Friedman - Baltimore MD, US
Jarrett A. Dunston - Owings Mills MD, US

Assignee:

Black & Decker Inc. - Newark DE

International Classification:

H02K 3/52
H02K 7/14

US Classification:

310 50

Abstract:

A power tool includes a motor having a stator assembly and a rotor pivotably arranged inside the stator. The stator assembly includes a lamination stack defining a plurality of poles; a plurality of field windings each arranged at at least two opposite poles of said plurality of poles and connected together around the stator assembly; and a plurality of conductive terminals longitudinally arranged along an outer surface of the lamination stack and electrically coupled to the plurality of field windings and a power source.

US Patent:

20170110945, Apr 20, 2017

Filed:

Oct 13, 2016

Appl. No.:

15/292600

Inventors:

- New Britain CT, US
Justin H. AYERS - Jarretsville MD, US
David J. SMITH - Columbia MD, US
David E. Gillespie - Baltimore MD, US
Sumiteru MORI - Baltimore MD, US
Jarrett A. Dunston - Bel Air MD, US
Ryan F. SCHROEDER - Hampstead MD, US

International Classification:

H02K 21/16
H02K 3/18
B24B 23/02
H02K 9/06
H02K 5/20
B25F 5/00
H02K 1/14
H02K 1/27

Abstract:

A brushless DC (BLDC) motor is provided including a stator assembly and a rotor rotatably arranged inside the stator. The stator assembly includes a generally-cylindrical lamination stack including a stator ring and stator teeth extending radially inwardly from the stator ring towards a center bore, where the center bore is arranged to receive the rotor therein. The stator assembly further includes an end insulator disposed at an and of the lamination stack, where the end insulator includes a generally-cylindrical outer ring and teeth portions extending radially inwardly from the outer ring towards a center of the end insulator, and the outer ring and the teeth portion correspond to the stator ring and the stator teeth. Stator windings are wound around the stator teeth and the corresponding teeth portion of the end insulator. Each tooth portion includes an outer face having a sloped portion sloped at an angle in the direction of the outer ring of the end insulator to bias the stator windings towards the outer ring.