Hand-held electrically powered cut-off tool with a kickback mitigation function

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 configured to be controlled by a control unit via a motor control interface,

• wherein the control unit comprises processing circuitry configured 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 processing circuitry of the control unit is further configured to determine an angular acceleration associated with the electric motor, and to detect the kickback condition based on a comparison between the determined angular acceleration and a variable detection threshold,
• where the variable detection threshold is further configured to be determined in dependence of one or more operating conditions of the tool and/or in dependence of a configuration input signal.

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 configured to be controlled by a control unit via a motor control interface,

• wherein the control unit comprises processing circuitry configured 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 processing circuitry of the control unit is further configured to determine an angular acceleration associated with the electric motor, and to detect the kickback condition based on a comparison between the determined angular acceleration and a detection threshold selectable from at least two different threshold values.