US 11,705,778 B2
Power tool with compact motor assembly
David J. Smith, Columbia, MD (US); Justin H. Ayers, Jarrettsville, MD (US); and Abraham Sanchez, Towson, MD (US)
Assigned to Black & Decker Inc., New Britain, CT (US)
Filed by Black & Decker Inc., New Britain, CT (US)
Filed on Dec. 16, 2020, as Appl. No. 17/123,644.
Claims priority of provisional application 62/950,409, filed on Dec. 19, 2019.
Prior Publication US 2021/0194319 A1, Jun. 24, 2021
Int. Cl. H02K 7/14 (2006.01); H02K 1/16 (2006.01); H02K 1/2733 (2022.01)
CPC H02K 7/145 (2013.01) [H02K 1/16 (2013.01); H02K 1/2733 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A power tool comprising:
a tool housing;
a support plate provided within the tool housing; and
a brushless direct-current (BLDC) motor received within the housing, comprising:
a stator assembly including a stator core, a plurality of stator teeth radially extending from the stator core and defining a plurality of slots therebetween, and a plurality of stator windings wound around the plurality of stator teeth;
a rotor shaft extending along a longitudinal axis;
a front motor bearing mounted on the rotor shaft and supported by the support plate;
a rear motor bearing mounted on the rotor shaft; and
a rotor comprising a rotor core mounted on the rotor shaft within the stator assembly and a magnet mounted on an outer surface of the rotor core, the rotor core defining an annular recess within which at portion of the front bearing and a portion of the support plate are located such that the a radial plane intersects the front bearing, the magnet, and the stator core;
wherein the support plate includes a first radial wall extending adjacent the stator assembly and a second radial wall extending radially inwardly of the plurality of stator windings adjacent the rotor core.