US 12,491,617 B2
Method for operating a machine tool and machine tool
Qin Liu, Oberschleissheim (DE); Bernd Gillmeier, Landsberg (DE); and Stefan Schmid, Untermuehlhausen (DE)
Assigned to Hilti Aktiengesellschaft, Schaan (LI)
Appl. No. 17/615,248
Filed by Hilti Aktiengesellschaft, Schaan (LI)
PCT Filed Jun. 17, 2020, PCT No. PCT/EP2020/066743
§ 371(c)(1), (2) Date Nov. 30, 2021,
PCT Pub. No. WO2020/260088, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 19182851 (EP), filed on Jun. 27, 2019.
Prior Publication US 2022/0250227 A1, Aug. 11, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. B25B 23/147 (2006.01); B23B 45/00 (2006.01); B25F 5/00 (2006.01)
CPC B25F 5/001 (2013.01) [B23B 45/008 (2013.01); B25B 23/1475 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method for operating a machine tool having a battery, an electric motor designed to rotationally drive an output shaft couplable to a tool, a controller for actuating the electric motor, and a device for determining a parameter, the machine tool operable in a first operating mode and a second operating mode, and the controller transferring the machine tool from the first operating mode into the second operating mode if the parameter exceeds or falls below a defined threshold value, the method comprising:
controlling the electric motor in the second operating mode by an amperage profile, the amperage profile comprising current pulses, a maximum amperage of the current pulses being varied depending on an actual charge status of the battery;
the current pulses including at least one first current pulse and second current pulses in the second operating mode alternately by the first current pulse and then a plurality of second current pulses.