Siemens Aktiengesellschaft

Joachim Denk

Dietmar Stoiber

Bernd Wedel

Hubert Schierling

Hans-Georg Köpken

Frank Viering

Elmar Schäfers

Jens Hamann

Gerd Griepentrog

Ulrich Wetzel

Klaus Geissdörfer

Gerhard Forster

Marco Festa

Klaus Hertinger

Richard Schmidt

Matthias Johannes Burghard

Jürgen Krejtschi

Bert-Uwe Köhler

Apparatus for determining a position of a movable object in a high pressure chamber includes a housing configured to delimit the high-pressure chamber and a carrier unit having an object-facing stationary end and a flexible region arranged between the stationary end and a region that extends through the housing. The flexible region is formed by a section of a guiding tube in the form of a tube spiral. A detecting unit is received in the carrier unit and includes a sensor for detecting a position of the object and outputting a position signal, and a sensor cable guided out of the high pressure chamber through the guiding tube and through the region for relaying the position signal to an evaluating unit. The sensor is arranged stationary in the high pressure chamber on the stationary end of the carrier unit.

Position determination in a high-pressure chamber

In a method for monitoring a magnetic bearing device for an electric rotating machine, a first pair of at least essentially diametrically opposed sensors and a second pair of at least essentially diametrically opposed sensors are arranged in offset relation about an angle. A distance is determined between each of the sensors and a body of rotation arranged inside the first and second pairs of sensors. A first average distance is determined from distance values of the first pair of sensors and a second average distance is determined from distance values of the second pair of sensors. A first change in the first average distance is captured and a second change in the second average distance is captured. The first and second changes are compared and a warning signal is outputted when a difference between the first and second changes exceeds a limit value.

Method for monitoring a magnetic bearing apparatus

In a method for operating a three-phase inverter of a converter-fed magnetic bearing, two coils are connected to respective outputs of the three-phase inverter at one end and are connected to each other and to a third output of the three-phase inverter at the other end. A variable control current is injected into the third output. A constant bias current flows between the respective outputs and thus serially through the two coils. The control current is divided among the two respective outputs so as to flow parallel through the two coils. This arrangement significantly reduces the effective current load of the three-phase inverter and significantly increases the slew rate of the control current.

Method for operating a three-phase inverter of a converter-fed magnetic bearing

The invention relates to a magnetic bearing control device and the use of a three-phase converter for controlling a magnetic bearing. According to the invention, a three-phase converter () is used for controlling a magnetic bearing (), all three phase currents () of the converter () being used for controlling the magnetic bearing (). A first solenoid of a couple of solenoids () of the magnetic bearing () is connected to a first (U) and a third (W) phase current output of the converter () while a second solenoid of the couple of solenoids () is connected to the first (U) and a second (V) phase current output of the converter such that the couple of solenoids () can be differently controlled by means of said one converter (). The converter () can also be connected to magnetic bearings that already have a bias winding, which is advantageous for retrofitting such existing magnetic bearings, for example.

Magnetic bearing control device having a three-phase converter, and use of a three-phase converter for controlling a magnetic bearing

A machine tool or a production machine, such as e.g. a multispindle machine, or a robot, is described, wherein a liquid metal lubricated slide bearing is not only used to transmit feed currents for electrical consumers but also to transmit currents for producing control signals. Accordingly, it is possible to apply via the liquid metal lubricated slide bearings a voltage of 600 volts in order to produce feed currents and a voltage of 24 volts in order to produce control signals.

Machine tool or production machine or robot

The invention relates to a device for safeguarding uninterrupted power supply of a magnetic bearing () in the event of a power supply voltage (U) failure. Said device comprises: a first frequency converter () which is supplied with power by the supply voltage (U) and controls a motor (), and a transformer () which is connected to a rectifier () and the motor (), said rectifier () supplying a DC-link electric circuit () of a second frequency converter () controlling the magnetic bearing () with power in the event of a power supply voltage failure. The invention allows prevention of damages to the magnetic bearing in the event of disruption of power supply of the magnetic bearing in the event of a power supply voltage failure.

Device for safeguarding an uninterruptible power supply of a magnet bearing in the event of failure of an electrical supply voltage

The invention relates to a method for guiding the displacement of a displaceable machine element () in a machine, comprising the following steps: a) specification of a guide target variable (x) that describes the desired displacement operation of the machine element (); b) determination of a pilot actual variable (M) and/or a guide actual variable (x) from the guide target variable (x) using a model (), said model () comprising a path model (), which simulates the dynamic behaviour of the elements () involved in the displacement. The invention also relates to a device that corresponds to the method. The invention permits the optimised guidance of the displacement of a displaceable machine element () in a machine.

Method and device for guiding the movement of a moveable machine element of a machine

Data is to be exchanged between a rotating element and a further element, with the rotating element being rotated by way of a hollow shaft. Light is coupled into torus halves and is reflected into a torus half and onto torus inner walls so often by way of a small opening until it exits at an opening of the other torus half. In a first embodiment, a torus-shaped optical fiber is divided into two torus halves. In another embodiment, hollow tori are used, which are filled with a fluid, namely either with a liquid or with air.

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Nürnberg, Germany

Joachim Denk