Conductix-wampfler Gmbh

Lenze Gmbh & Co Kg

Wolfgang Schnurbusch

Andrew Green

Benjamin Rhein

Elmar Hartmann

J&uuml;rgen Krietemeier

Apparatus for power transmission and for inductive communication with a track or rail-guided moving object, with a power transmission line which extends along an envisaged path of movement of the object&#x2014;with which a current collector can make contact&#x2014;for supplying power to moving loads, a separate data line, at least one communication inductance on the object coupleable magnetically to the data line, and with a communication device which is connected to the communication inductance. The communication device has a modem which operates on the basis of an orthogonal frequency-division multiplexing method at a data rate of at least 50 MBit/s. One end of the data line is connected to a communication device connected to a central control unit and containing a modem of the same type as the communication device in the moving object.

Apparatus for power transmission and for inductive communication

In order to identify phase failure in an asynchronous machine, monitoring of the phase currents is performed, a trigger signal being generated for each phase in the event of a limit value being undershot. In order to cover the entire frequency range in converter operation, a changeover is made between different monitoring states. In the first monitoring state, the trigger signal is generated if the instantaneous value of the phase current in each case falls below the limit value. A changeover is then always made to the second monitoring state, where the duration of the trigger signal is compared with the swept angle of rotation of the voltage vector in the same phase. If the state of the phase current lasts during this period of time, in a third monitoring state the duration of the trigger signal or the continuance of the phase current state is checked during a defined delay time interval. If the trigger signal outlasts the delay time interval, phase failure is signaled.

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Coppenbrügge, Germany

Wolfgang Schnurbusch