Abstract: A power tool, in particular a hand-held power tool, for example a polishing device, a grinding device, a sawing device and/or a router, with a tool, an electric motor for driving the tool and a control unit for controlling the electric motor, in which the power tool is designed for connection to an AC supply voltage and includes a rectifier arrangement with an intermediate circuit for providing an intermediate circuit voltage on the basis of the AC supply voltage. The intermediate circuit voltage has a plurality of successive voltage half-waves, and in which the control unit is configured to calculate, for each voltage half-wave, a respective torque half-wave for controlling the electric motor, the control unit being configured to sample each voltage half-wave in order to obtain a plurality of voltage half-wave values, and to convert each voltage half-wave value into a respective torque half-wave value in order to calculate the respective torque half-wave.

Abstract: A power tool, in particular a hand-held power tool, for example a polishing device, a grinding device and/or a sawing device, with a tool, an electric motor for driving the tool and a control unit for controlling the electric motor. The power tool is designed for connection to a mains voltage and includes a rectifier arrangement with an intermediate circuit for providing an intermediate circuit voltage based on the mains voltage, the Intermediate circuit voltage having a plurality of successive voltage half-waves, and the control unit being configured to provide, for each voltage half-wave, a respective torque half-wave for driving the electric motor, the waveform of which torque half-wave is flattened with respect to the waveform of the voltage half-wave.

Abstract: A power tool, in particular a hand-held power tool, for example a polishing device, a grinding device, a sawing device and/or a router, with a tool, an electric motor for driving the tool and a control unit for controlling the electric motor, in which the power tool is designed for connection to an AC supply voltage and includes a rectifier arrangement with an intermediate circuit for providing an intermediate circuit voltage on the basis of the AC supply voltage. The intermediate circuit voltage has a plurality of successive voltage half-waves, and in which the control unit is configured to calculate, for each voltage half-wave, a respective torque half-wave for controlling the electric motor, the control unit being configured to sample each voltage half-wave in order to obtain a plurality of voltage half-wave values, and to convert each voltage half-wave value into a respective torque half-wave value in order to calculate the respective torque half-wave.

Abstract: A power tool, in particular a hand-held power tool with a tool, an electric motor for driving the tool and a control unit for controlling the electric motor. The power tool is designed for connection to a mains voltage and includes a rectifier arrangement with an intermediate circuit for providing an intermediate circuit voltage based on the mains voltage, the intermediate circuit voltage having a plurality of successive voltage half-waves, the control unit being configured to provide a torque curve for driving the electric motor, the torque curve including a respective torque half-wave for each voltage half-wave, and the control unit being configured to determine an countervoltage induced in the electric motor and, in response to the countervoltage being greater than or equal to the intermediate circuit voltage, to reduce a current torque value of the torque curve.

Abstract: A power tool, in particular a hand-held power tool, for example a polishing device, a grinding device and/or a sawing device, with a tool, an electric motor for driving the tool and a control unit for controlling the electric motor. The power tool is designed for connection to a mains voltage and includes a rectifier arrangement with an intermediate circuit for providing an intermediate circuit voltage based on the mains voltage, the Intermediate circuit voltage having a plurality of successive voltage half-waves, and the control unit being configured to provide, for each voltage half-wave, a respective torque half-wave for driving the electric motor, the waveform of which torque half-wave is flattened with respect to the waveform of the voltage half-wave.

Abstract: A method for determining a rotor position of an electric motor (2) of a power tool (10), in particular an electric screwdriving tool, including the steps of: checking (S4) whether a first electric motor current (I1) is below a threshold value (SW), and in response to the check indicating that the first electric motor current (I1) is below the threshold value (SW), determining a rotor position of the electric motor (2) based on the first electric motor current (I1) and/or a second electric motor current.