Jungheinrich Aktiengesellschaft

Wma Airsense Analysentechnik Gmbh

Torsten Hunte

Andreas Walte

Gerhard Matz

Nils-Peter Hansen

Wolf Munchmeyer

Christian Aleyt

Stefan Dohren

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

The invention relates to a device for identifying gaseous compounds, comprising a sensor array ( ) having, for instance, ten gas sensors ( ) in the form of semiconductor gas sensors. Said sensor array ( ) has a supply line ( ) with an inlet ( ) and an outlet ( ). A switchable three-way valve ( ) is located in the supply line ( ), to which a selective collector unit ( ) is attached. Said collector unit ( ) comprises a special adsorber ( ), a heater ( ) and a separate feed pump ( ) with a flow sensor ( ). A secondary line ( ), in which a dilution unit ( ) is arranged, discharges into the feed line ( ) between the three-way valve ( ) and the sensor array ( ). A feeding and control unit ( ) also having a feed pump ( ) with a flow sensor ( ) is located in the area of the outlet ( ) of the sensor array ( ). An electrical line ( ) leading to an evaluation computer ( ) branches off from the sensor array ( ).

Method and device for identifying gaseous compounds

Growing community of inventors

Hamburg, Germany

Torsten Hunte