US 11,705,721 B2
Kickback control methods for a power tool including a force sensor
Maxwell L. Merget, Milwaukee, WI (US); and Jessie L. Bernitt, Milwaukee, WI (US)
Assigned to Milwaukee Electric Tool Corporation, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on Mar. 8, 2021, as Appl. No. 17/194,722.
Claims priority of provisional application 62/987,515, filed on Mar. 10, 2020.
Prior Publication US 2021/0283759 A1, Sep. 16, 2021
Int. Cl. H02H 7/26 (2006.01); H02K 11/215 (2016.01); H02K 7/00 (2006.01); H02K 7/14 (2006.01); H02H 1/00 (2006.01); B25F 5/00 (2006.01); H02J 13/00 (2006.01); B25D 17/24 (2006.01)
CPC H02H 7/26 (2013.01) [B25F 5/001 (2013.01); H02H 1/0007 (2013.01); H02K 7/003 (2013.01); H02K 7/145 (2013.01); H02K 11/215 (2016.01); B25D 17/24 (2013.01); B25D 2250/095 (2013.01); H02J 13/00002 (2020.01)] 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 motor within the motor housing portion and having a rotor and a stator, the rotor configured to rotationally drive a motor shaft about a rotational axis;
a trigger configured to be actuated to cause the power tool to drive the motor;
at least one grip sensor supported by the housing and configured to generate a grip parameter, wherein the grip parameter represents a user grip on the housing;
a switching network electrically coupled to the motor; and
an electronic processor connected to the switching network and the at least one grip sensor, the electronic processor configured to implement kickback control of the power tool, wherein, to implement the kickback control, the electronic processor is configured to:
determine a kickback threshold based on the grip parameter,
control, in response to the trigger being actuated, the switching network to drive the motor,
receive a signal related to a power tool characteristic,
determine, based on the power tool characteristic being greater than or equal to the kickback threshold, that a kickback event of the power tool is occurring, and
control, in response to determining that the kickback event is occurring, the switching network to cease driving of the motor.