Hilti Aktiengesellschaft

Germar Meiendres

Konstantin Baxivanelis

Johannes Stempfhuber

Thomas Mueller

Erwin Manschitz

Stefan Hammerstingl

Franz Moessnang

Holger Cecchin

Markus Looser

Wolfgang Schubert

Benedikt Beckert

Thomas Muller

Franz Mössnang

Thomas Müller

A machine tool has a tool retainer for retaining a tool, a motor and a drivetrain which couples the motor with the tool retainer for transmitting a torque. A system pushbutton is coupled with a motor control. When the system pushbutton is activated by a user, the motor control controls the motor in such a way that the motor turns in a first sense of rotation for a duration and then in a sense of rotation opposed to the first sense of rotation. The duration is shorter than 100 ms.

Machine tool and control procedure

A pneumatically striking hand-held power tool is controlled by the following steps. An acceleration (a) along a striking axis () of the hand-held power tool () is detected. A driving power is reduced if the detected acceleration (a) is greater than a threshold value (A), the threshold value (A) being selected to be greater than maximum acceleration values (a, a) that occur on a workpiece during the striking operation of the hand-held power tool ().

Control method and hand-held power tool

A method for controlling a motor () which drives a disk-shaped tool () of a power tool () and to which a motor voltage in the amount of a nominal value is applied in an 'on' position of a motor switch (), includes determination of an actual motor current (IM) applied to the motor () and comparing it to a first predetermined threshold (GW), and automatically triggering of a control process for protecting the motor () when an overload condition which is defined in that the first predetermined threshold (GW) is exceeded beyond a first predetermined limiting time period (grDt), is met, the control process including reduction of the motor voltage applied to the motor () by a magnitude that can be perceived by the user as a choke value.

Method of controlling a motor

The method of controlling a motor which drives a tool of a power tool, includes initializing an electronic device and switching the motor on in a first step (), continuously monitoring of the motor current (IM) and a battery voltage (UB) in a second step () which alternates with a third step () in which a continuous comparison of the battery voltage (UB) to a threshold value (GW) stored in a memory of the electronic device is carried out.

Method of controlling a motor of a battery-operated power tool

Growing community of inventors

Landsberg, Germany

Germar Meiendres