US 12,224,697 B2
Start-up mode for a power tool
Tobias Hofmann, Kirchheim (DE); and Norbert Morgenstern, Böblingen (DE)
Assigned to Festool GmbH, Wendlingen (DE)
Appl. No. 18/044,314
Filed by Festool GmbH, Wendlingen (DE)
PCT Filed Jul. 22, 2021, PCT No. PCT/EP2021/070518
§ 371(c)(1), (2) Date Mar. 7, 2023,
PCT Pub. No. WO2022/053214, PCT Pub. Date Mar. 17, 2022.
Claims priority of application No. 10 2020 211 311.4 (DE), filed on Sep. 9, 2020.
Prior Publication US 2024/0313676 A1, Sep. 19, 2024
Int. Cl. H02P 1/40 (2006.01); B24B 23/02 (2006.01); H02P 6/21 (2016.01)
CPC H02P 6/21 (2016.02) [B24B 23/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power tool comprising:
a tool,
an electric motor for driving the tool, and
a control unit for driving the electric motor with a motor current, the control unit having a start-up mode in which the control unit drives the electric motor, so that the electric motor undergoes a rotational speed ramp during the start-up mode, in which during the rotational speed ramp, the rotational speed of the electric motor is increased continuously up to a working rotational speed, the control unit being configured to set one or more of: for the start-up mode, the slope of the rotational speed ramp on a basis of a detected temperature and for the start-up mode, a strength of the motor current on the basis of the detected temperature.