Hilti Aktiengesellschaft

Hermann Schuster

Helmut Burger

Josef Hunger

Frank Fritsch

Michael Reiner

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 operating procedure for the motor () of an electric powered tool. The operating idle speed of the motor () is set to a value using regulator electronics (), and the operating speed is the same as a chosen operating speed (n). The motor () runs on a pre-determined and higher idle speed (n) for cooling purposes after a specific idle time (&#x394;T). while the motor () runs on the pre-determined operating idle speed (n). The engine speed is immediately set to the operating speed (n) once again, when the motor requires a moment of strain at a certain period of time (T) to maintain simple and comfortable operating procedures.

Operating procedure and cooling system mechanism for the motor of an electric powered tool

A universal electric motor ( ) for driving an electric hand-held tool device which experiences a high dust load, has a commutator ( ), with carbon brushes ( ) and lamellas ( ). The motor has, for protection against dust particles carried along in the cooling air flowing through it, a protective shield ( ) of a stiff and thermally conductive material.

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Geltendorf, Germany

Hermann Schuster