Hilti Aktiengesellschaft

Michael Reiner

Josef Hunger

Peter Hellmann

Hermann Schuster

Guido Werdun

Guido Werdün

A universal motor having two carbon brushes () and two series connected field coils (). The universal motor having an interference suppressing capacitor () with a first terminal () connected directly to the first carbon brush () and connected with a field coil () in a conducting manner. The interference suppressing capacitor () also including a second terminal () connected directly to the second carbon brush () and connected to a power line () in a conducting manner.

Interference-suppressed universal motor

An electrical hand-tool device and start-up safety routine protecting against start-up blockages, in which an electrical motor is connected, for a short time span (T ), with the current supply at a determinable resistance. At least one of a limit value (&agr; ) and a shut-off point in time (t ) is determined, for the safety routine in the event of tool blockage, using a measurement of the angle of rotation (&phgr;) of the rotor taken over the time span (T ) dependent on the start-up behavior of a rotor in the time span (T ).

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Untermeitingen, Germany

Michael Reiner