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1. (WO2017149060) ELECTRIC PORTABLE POWER TOOL AND CALIBRATION METHOD

Pub. No.:    WO/2017/149060    International Application No.:    PCT/EP2017/054861
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Fri Mar 03 00:59:59 CET 2017
IPC: B25D 17/00
B25F 5/00
H01H 25/00
G01D 5/165
G01D 18/00
Applicants: HILTI AKTIENGESELLSCHAFT
Inventors: NAGL, Tobias
Title: ELECTRIC PORTABLE POWER TOOL AND CALIBRATION METHOD
Abstract:
An electric portable power tool (100) having a motor control unit (10) for controlling an electric motor (90) comprised by the portable power tool (100), and having a potentiometer-switch unit (20) which is connected to the motor control unit (10) for the purpose of defining a setpoint speed, wherein the potentiometer-switch unit (20) has a pusher (25) which is set up such that in the event of travel actuation, first of all a mechanical contact in the switch is closed and then, in the event of continued travel actuation, a mechanical slider becomes active on a potentiometer sliding path, wherein the motor control unit (10) is configured to control the electric motor using a calibrated, preferably linearized potentiometer characteristic (KL), wherein the potentiometer characteristic (KL) is calibrated and preferably extrapolated such that an intersection point (SP1) between the potentiometer characteristic (KL) and a switch characteristic (SL) of the switch is located in the first square (Q1) of a coordinate system which is defined by the electrical resistance of the potentiometer as the ordinate and the actual actuating travel (BW) of the pusher (25) as the abscissa.