US 11,855,521 B2
Brushless DC motor for a body-grip power tool
Dustin Jefferies, Baltimore, MD (US); David J. Smith, Columbia, MD (US); Marcus E. E. Rydin, Baltimore, MD (US); Justin H. Ayers, Jarrettsville, MD (US); Sumiteru Mori, Baltimore, MD (US); John B. Fogle, White Hall, MD (US); John D. Cox, Lutherville, MD (US); Kristopher Cochran, Middle River, MD (US); and Barak N. Gohn, Shrewsbury, PA (US)
Assigned to BLACK & DECKER, INC., New Britain, CT (US)
Filed by Black & Decker Inc., New Britain, CT (US)
Filed on Feb. 1, 2022, as Appl. No. 17/590,011.
Claims priority of provisional application 63/144,802, filed on Feb. 2, 2021.
Claims priority of provisional application 63/266,197, filed on Dec. 30, 2021.
Prior Publication US 2022/0247269 A1, Aug. 4, 2022
Int. Cl. H02K 5/15 (2006.01); H02K 7/14 (2006.01); H02K 3/52 (2006.01); H02K 5/173 (2006.01); H02K 7/08 (2006.01); H02K 21/16 (2006.01); B25F 5/02 (2006.01); H02K 11/00 (2016.01); B25F 5/00 (2006.01)
CPC H02K 7/145 (2013.01) [B25F 5/02 (2013.01); H02K 3/522 (2013.01); H02K 5/1732 (2013.01); H02K 7/083 (2013.01); H02K 11/0094 (2013.01); H02K 21/16 (2013.01); B25F 5/001 (2013.01); H02K 2203/03 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A power tool comprising:
a housing including a grip portion; and
a brushless direct-current (BLDC) motor at least partially disposed within the grip portion of the housing and comprising:
a stator including a stator core and a plurality of stator windings;
a rotor rotatably received within the stator and including a rotor shaft extending along a longitudinal axis and a plurality of permanent magnets;
a front bearing support structure disposed on a front side of the stator to support a front bearing of the rotor shaft; and
a rear bearing support structure disposed on a rear side of the stator to support a rear bearing of the rotor shaft;
wherein the stator core includes a non-segmented construction with a maximum diameter of approximately smaller than or equal to 34 mm, and a ratio of a motor size (Km) constant of the motor to a length of the motor is in the range of approximately 0.39 to 0.59 (Nmm/√)/mm.