US 12,081,104 B2
Brushless DC motor configuration for a power tool
Andrew T. Beyerl, Pewaukee, WI (US)
Assigned to MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on Sep. 28, 2023, as Appl. No. 18/476,810.
Application 18/476,810 is a continuation of application No. 17/228,932, filed on Apr. 13, 2021, granted, now 11,777,369.
Application 17/228,932 is a continuation of application No. 16/901,192, filed on Jun. 15, 2020, granted, now 10,978,933, issued on Apr. 13, 2021.
Application 16/901,192 is a continuation of application No. 16/422,337, filed on May 24, 2019, granted, now 10,693,345, issued on Jun. 23, 2020.
Application 16/422,337 is a continuation of application No. 15/645,090, filed on Jul. 10, 2017, granted, now 10,348,159, issued on Jul. 9, 2019.
Application 15/645,090 is a continuation of application No. 14/295,703, filed on Jun. 4, 2014, granted, now 9,787,159, issued on Oct. 10, 2017.
Claims priority of provisional application 61/832,012, filed on Jun. 6, 2013.
Prior Publication US 2024/0030781 A1, Jan. 25, 2024
Int. Cl. H02K 11/33 (2016.01); B23B 45/02 (2006.01); B25B 21/00 (2006.01); B25F 5/00 (2006.01); H02K 3/52 (2006.01); H02K 7/14 (2006.01); H02K 29/08 (2006.01)
CPC H02K 7/145 (2013.01) [B23B 45/02 (2013.01); B25B 21/00 (2013.01); B25F 5/008 (2013.01); H02K 3/522 (2013.01); H02K 11/33 (2016.01); H02K 29/08 (2013.01); H02K 2203/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power tool comprising:
a housing;
a brushless direct current (DC) motor within the housing, wherein the brushless DC motor includes a rotor and a stator, wherein the rotor is coupled to a motor shaft arranged to rotate about a longitudinal axis, the longitudinal axis extending through the motor shaft, and wherein the motor shaft is arranged to produce a rotational output to a drive mechanism;
a metal mounting structure positioned at a first end of the stator;
a heat sink positioned at a second end of the stator opposite the first end, wherein the stator is positioned between the heat sink and the metal mounting structure;
a first threaded fastening element securing the heat sink and the stator together, and a second threaded fastening element securing the metal mounting structure and the stator together, wherein the stator has an axial length, and the first threaded fastening element and the second threaded fastening element extend in a direction parallel to the axial length of the stator; and
a printed circuit board (PCB) positioned at the second end of the stator and secured to the heat sink on a side of the heat sink that is opposite to the stator, wherein the PCB includes a Hall sensor, power switching elements, and a through-hole through which the longitudinal axis extends, wherein the power switching elements are flat-mounted to a surface of the PCB that faces a direction opposite to the heat sink and the stator.