US 12,115,642 B2
Power tool including loss of control mitigation
Joshua D. Widder, Racine, WI (US); Kyle J. Krause, Milwaukee, WI (US); Brennan O'Gorman, Brookfield, WI (US); Jesse Gibb, Brookfield, WI (US); Joseph W. Miller, Waukesha, WI (US); Mauricio Builes Zapata, Wauwatosa, WI (US); Ronnay Jackson, Brookfield, WI (US); and Brittany A. Sellnow, Milwaukee, WI (US)
Assigned to Milwaukee Electric Tool Corporation, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on May 2, 2023, as Appl. No. 18/311,044.
Claims priority of provisional application 63/337,916, filed on May 3, 2022.
Claims priority of provisional application 63/380,634, filed on Oct. 24, 2022.
Prior Publication US 2023/0356381 A1, Nov. 9, 2023
Int. Cl. B25F 5/02 (2006.01); B25D 16/00 (2006.01)
CPC B25F 5/02 (2013.01) [B25D 16/006 (2013.01); B25D 2250/221 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power tool comprising:
a housing having a motor housing portion, a handle portion, and a battery pack interface;
a first variable speed input configured to set a maximum operating speed for the power tool;
a second variable speed input configured to control an operating speed for the power tool up to the maximum operating speed for the power tool;
a brushless direct current (“DC”) motor within the motor housing portion and having a rotor and a stator, wherein the rotor is configured to rotationally drive a motor shaft about a rotational axis;
a switching network electrically coupled to the brushless DC motor;
a user input configured to set a sensitivity level for loss of control detection;
an acceleration sensor configured to measure an acceleration of the housing;
an electronic processor connected to the switching network and the sensor, the electronic processor configured to:
control the switching network to drive the brushless DC motor at the operating speed based on the first variable speed input and the second variable speed input,
receive one or more signals related to the acceleration of the housing of the power tool from the acceleration sensor,
determine that the one or more signals exceed an acceleration threshold corresponding to the sensitivity level for loss of control detection, and
control the switching network to brake the brushless DC motor in response to the one or more signals exceeding the acceleration threshold.