Schaeffler Technologies Ag & Co .kg

Physik Instŕumente (pi) Gmbh & Co. Kg

Physik Instrumente Gmbh & Co. Kg

Dentacon Gmbh

Michael Katzschmann

Christian Rudolf

Peter Kornetzky

Carolin Walenda

Rainer Glöβ

Christoph Schäffel

Hans-Ulrich Mohr

Rainer GlÖß

Steffen Hesse

A high-resolution positioning device has a stator and a rotor, a coil array, arranged on the stator, and having at least three groups of flat coils, wherein each group has at least two single coils and the coil array encloses a free space on the stator, also having permanent magnetically-excited circuits that are situated on, against or in the rotor and form a magnet array which likewise encloses a free space, wherein the free spaces accommodate a position measuring system which has a measuring head having sensors, and an area scale. The device is in the form of a freely suspended, magnetically controlled six-dimensional drive, wherein the measuring head is situated in the coil array free space and the area scale is situated in the magnet array free space, and the rotor is free of drive-related electrical or electronic and, in this regard, live parts.

High-resolution positioning device

A sensor system for a magnetic bearing, which has two actuator coils, two clocked power output stages, a current sensor for detecting those currents in the actuator coils which are encumbered with a ripple current, and a sensor interface. The clocked power output stages provide a pulse-width-modulated output voltage, the pulse width of which is narrowed or widened by small amounts in a predefined order, and the pulse widths of the clocked power output stages are modulated in a fixed phase relationship with respect to one another. The sensor system specifies a sensor system for a magnetic bearing with a clocked power output stage. A magnetic bearing, a control device for a magnetic bearing and a method for detecting the position in a magnetic bearing are also disclosed.

Method and arrangement for the sensorless operation of magnetic bearings

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Ilmenau, Germany

Michael Katzschmann