US 11,673,248 B2
High-power cordless, hand-held power tool including a brushless direct current motor
Brandon L. Verbrugge, Brookfield, WI (US); Matthew J. Mergener, Germantown, WI (US); Matthew P. Wycklendt, Delafield, 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. 28, 2022, as Appl. No. 17/809,467.
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 2022/0339771 A1, Oct. 27, 2022
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
 
1. A power tool comprising:
a battery pack interface configured to receive a battery pack that is removably coupled to a housing of the power tool, the battery pack having a nominal voltage of 18 Volts to 36 Volts;
a brushless direct-current (“BLDC”) motor, the BLDC motor having an outer diameter of 50 millimeters to 80 millimeters and a weight of 336.5 grams to 720 grams;
a switching array including a plurality of switching field effect transistors (“FETs”) electrically connected between the BLDC motor and the battery pack interface, 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
an output shaft coupled to the BLDC motor to provide an output of the power tool, wherein when powered by the battery pack
the power tool is configured to produce a maximum short-duration power output of at least 600 Watts and an average long-duration power output, throughout a discharge cycle of the battery pack, of at least 400 Watts, and
a ratio of Ampere-hours (Ah) discharged by the battery pack for providing the average long-duration power output to length of run in seconds (s) of the average long-duration power output is at least 0.0072Ah:1 s.