Jungheinrich Aktiengesellschaft

Nils-Peter Hansen

Michael Knieriem

Martin Langlotz

Torsten Hunte

Frank Hörmann

Christian Aleyt

Ulf Bergmann

Benjamin Jonas

Olaf Lenz

Rüdiger Schwarz

Stephan Taube

Jürgen Rautmann

Arne Dipl-Ing Mahler

Hennig Kröger

A method for the no-transmitter speed determination of an asynchronous machine, comprising the steps which follow: a module for field-oriented regulation calculates the voltages to be applied to the asynchronous machine on the basis of a setpoint for the speed, at least two values measured for the conductor current, and a speed calculated by an observer module, the observer module has applied thereto the voltage values obtained from the field-oriented regulation or the voltage values measured, and calculates a value of the moment-forming current &#xee;sq(t) and an inner moment Mi(t) of the asynchronous machine from the values applied, a moment module calculates a load moment Ml(t) acting upon the asynchronous machine from the difference of the moment-forming currents from the field-oriented regulation and the observer module, a speed module calculates the actual speed of the asynchronous machine via the load moment of the moment module and the inner moment of the observer module.

Method for the no-transmitter speed determination of an asynchronous machine

Driving system with converter control for low voltage three-phase motors, which is provided with a power unit containing transistors and capacitors, a triggering unit for the transistors and a control unit as well as connections for direct and alternating current, the units being disposed in a common casing made of a heat-conductive material, characterised by the following features: the power unit is provided with a first printed circuit board () made of fairly heat-conductive material, which is disposed on the fairly heat-conductive bottom of the casing () in a plane fitting arrangement, a second printed circuit board () contains the triggering unit, the second printed circuit board () being electrically and mechanically connected to the first printed circuit board () in a spacing to it with the aid of contact pins () of metallic material attached on the first printed circuit board () by soldering, and terminal pins () are connected with contact points () of the first printed circuit board () and lead through openings in the second printed circuit board () as well as in the cover () in an insulated manner.

Driving system with converter control for low-voltage three-phase motors

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Kiel, Germany

Nils-Peter Hansen