Liebherr-elektronik Gmbh

Liebherr-aerospace Lindenberg Gmbh

Ralf Cremer

Alfred Engler

Hans-Peter Lavergne

Nejat Mahdavi

Sebastian Braun

Rodolphe De Maglie

Dirk Metzler

Pierre Brodeau

Georg Ried

Ingo Nannen

Jacques Herzog

Matthias Ludwig

The invention relates to a method for determining the piston position of a hydraulic or pneumatic piston cylinder unit, wherein the cylinder jacket and the piston form an electrical conducting path and the piston position is determined with the aid of the inductive and/or resistive properties of the conducting path that is formed. In addition, the invention relates to a piston cylinder unit having a measuring device for carrying out such a method.

Method for determining the piston position of a piston cylinder unit and a piston cylinder unit

The invention relates to a drive circuit for an electric motor having an aerodynamic bearing of the motor shaft, wherein the drive circuit comprises at least one storage means for storing electrical energy by which the electric motor can be fed with electrical energy on a failure of the supply voltage or DC-link voltage to obtain a minimum speed of the motor shaft required for the air support at least at times.

Drive circuit for an air bearing motor

The present disclosure relates to a piston-cylinder unit with a device for determining position, the device comprising at least one exciter that is indirectly or directly electrically connected with the cylinder jacket and the cylinder piston of the piston-cylinder unit, and that excites the electrical oscillating circuit formed by the piston-cylinder unit and the contact lines to oscillate at its resonant frequency, it being possible to measure an electrical signal characterizing the resonant frequency on the piston-cylinder unit. The invention also relates to a construction machine or piece of hoisting equipment with such a piston-cylinder unit.

Piston-cylinder unit with device for determining position

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Lindau, Germany

Ralf Cremer