US 12,454,039 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. 17/615,198
Filed by Hilti Aktiengesellschaft, Schaan (LI)
PCT Filed Jun. 17, 2020, PCT No. PCT/EP2020/066749
§ 371(c)(1), (2) Date Nov. 30, 2021,
PCT Pub. No. WO2020/260090, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 19182847 (EP), filed on Jun. 27, 2019.
Prior Publication US 2022/0226974 A1, Jul. 21, 2022
Int. Cl. B25F 5/00 (2006.01); B25B 23/147 (2006.01)
CPC B25B 23/147 (2013.01) [B25F 5/001 (2013.01)] 20 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 determinator for determining a parameter, the machine tool operable in a first operating mode and a second operating mode, the method comprising:
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, and
controlling the electric motor in the second operating mode after the transferring step by an amperage profile, the amperage profile including at least one first current pulse and at least one second current pulse, a maximum amperage of the first current pulse being greater than a maximum amperage of the second pulse;
wherein the electric motor is controlled in the second operating mode to repeat a sequence of one of the at least one first current pulse followed by a plurality of the at least one second current pulse.