US 12,377,529 B2
High-power cordless, hand-held power tool including a brushless direct current motor
Brandon L. Verbrugge, White Bear Lake, MN (US); Matthew J. Mergener, Mequon, WI (US); Matthew P. Wycklendt, Madison, WI (US); Jeffrey C. Hessenberger, Neosho, WI (US); and Dennis J. Grzybowski, New Berlin, WI (US)
Assigned to Milwaukee Electric Tool Corporation, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on Jun. 9, 2023, as Appl. No. 18/332,017.
Application 18/332,017 is a continuation of application No. 17/809,467, filed on Jun. 28, 2022, granted, now 11,673,248.
Application 17/809,467 is a continuation of application No. 17/499,065, filed on Oct. 12, 2021, granted, now 11,370,099, issued on Jun. 28, 2022.
Application 17/499,065 is a continuation of application No. 17/085,120, filed on Oct. 30, 2020, granted, now 11,141,851, issued on Oct. 12, 2021.
Application 17/085,120 is a continuation of application No. 13/838,126, filed on Mar. 15, 2013, granted, now 10,821,591, issued on Nov. 3, 2020.
Claims priority of provisional application 61/725,961, filed on Nov. 13, 2012.
Prior Publication US 2023/0347490 A1, Nov. 2, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B25F 5/00 (2006.01); B25F 5/02 (2006.01)
CPC B25F 5/00 (2013.01) [B25F 5/008 (2013.01); B25F 5/02 (2013.01)] 30 Claims
OG exemplary drawing
 
8. A power tool comprising:
a housing;
a battery pack removably coupled to the housing;
a brushless direct-current (“BLDC”) motor including a rotor having a cylindrically-shaped rotor portion and a plurality of permanent magnets set or embedded in the rotor portion, wherein a diameter of the rotor portion is between 20 millimeters and 30 millimeters;
a switching array including a plurality of switching field effect transistors (“FETs”) electrically connected between the BLDC motor and the battery pack, the plurality of switching FETs configured for controlling application of power to the BLDC motor, wherein the plurality of switching FETs have a drain-to-source resistance of below 3 milli-Ohms;
a controller configured to generate a control signal to selectively enable and disable the plurality of switching FETs in the switching array to drive the BLDC motor with power provided from the battery pack; and
wherein the power tool is configured to produce a maximum short-duration power output of at least 600 Watts and wherein the battery pack is configured to provide a current of at least 55 Amperes during the maximum short-duration power output,
wherein the BLDC motor has a weight between 336.5 and 700 grams.