Siemens Aktiengesellschaft

Birco Gmbh

Christian Merkel

Willi Bette

Andreas Ziroff

Stefan Schwarzer

Stefan Ingo Meier

Gerd Michaelis

Wolf-Martin Rasenack

Reinhold Götz

Werner Czerny

Martin Meinardus

Jürgen Mielke

Iuliu Vlaic

Juergen Mielke

Reinhold Goetz

Luliu Vlaic

Andreas Heilmann

Mathias Rebling

Jan Kabus

Peter Lange

Markus ERDMANNSDÖRFER

Alexander Stukenkemper

A method for controlling a drive having at least one converter, at least one motor and an assigned drive control, wherein a failsafe CPU is operated separately from the drive control and only processes safety-relevant information, where a number of safety functions are implemented by the failsafe CPU such that the safety-relevant functions of the drive are implemented in a simple and reliable manner.

Method for controlling a drive

A drive roller, driven by a motor, moves a material web on a set of rollers. The present rotational speed of the motor is detected. A current web speed is determined from the detected rotational speed and a diameter of the drive roller. The current web speed is compared with a specified target speed value and a specified threshold speed value of the web speed.

Monitoring web speed of material web

A method for operating a fuel cell plant and a fuel cell plant are provided. The thermal efficiency of a fuel cell plant results from the useful heat which is generated per quantity of fuel. Heat which is radiated from the fuel cell plant into the environment is lost and cannot be utilized. The method minimizes the radiation of heat from the fuel cell plant. Air for operation of the fuel cells is passed into a housing which surrounds heat-radiating components of the fuel cell plant. The air flows around the components, absorbs the heat which is radiated and delivers it to the fuel cell block, where the heat is emitted to cooling water that cools the fuel cell block and transfers the heat to water of a heating-water circuit.

Method for operating a fuel cell plant and fuel cell plant

Growing community of inventors

Erlangen, Germany

Christian Merkel