US 12,103,201 B2
Hand-held electrically powered cut-off tool with a kickback mitigation function
Magnus Rosén, Alingsås (SE); Victor Johansson, Partille (SE); David Dufke, Veberöd (SE); and Johan Berg, Alingsås (SE)
Assigned to HUSQVARNA AB, Huskvarna (SE)
Appl. No. 18/032,260
Filed by HUSQVARNA AB, Huskvarna (SE)
PCT Filed Sep. 13, 2021, PCT No. PCT/SE2021/050875
§ 371(c)(1), (2) Date Apr. 17, 2023,
PCT Pub. No. WO2022/086380, PCT Pub. Date Apr. 28, 2022.
Claims priority of application No. 2051213-3 (SE), filed on Oct. 19, 2020.
Prior Publication US 2023/0396056 A1, Dec. 7, 2023
Int. Cl. B28D 7/00 (2006.01); B25F 5/00 (2006.01); B28D 1/04 (2006.01); H02H 7/085 (2006.01); H02K 7/14 (2006.01); H02P 3/22 (2006.01); H02P 6/182 (2016.01); H02P 21/14 (2016.01); B27G 19/04 (2006.01)
CPC B28D 7/005 (2013.01) [B25F 5/00 (2013.01); B28D 1/04 (2013.01); H02H 7/0854 (2013.01); H02K 7/145 (2013.01); H02P 3/22 (2013.01); H02P 6/182 (2013.01); H02P 21/143 (2013.01); B27G 19/04 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A hand-held electrically powered cut-off tool for cutting concrete and stone by a rotatable cutting disc, the cut-off tool comprising an electric motor arranged to be controlled by a control unit via a motor control interface,
wherein the control unit is arranged to obtain data indicative of an angular velocity of the cutting disc, and to detect a kickback condition based on a decrease in angular velocity,
wherein the control unit is arranged to control an electromagnetic braking of the electric motor in response to detecting a kickback condition, and
wherein the control unit is arranged to actively regulate an energy outtake from the electric motor over the control interface during the electromagnetic braking.