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AssigneeSiemens Aktiengesellschaft
InventorsDieter Eckardt, Carsten Rebbereh
Estimating the term…
In a method and device for monitoring speed, in particular for monitoring the rotation speed of an electric machine, two processors are employed which monitor the speed using different checking modes and cross-compare results. The first processor executes a conventional control algorithm and checks on the basis of an estimated or measured value of the speed whether a speed limit has been exceeded. The second processor determines the actual output frequency, which is also indicative of the speed, of a converter either from actual current values, which are measured anyway, or by reconstructing the voltage from control signals of transistors. Both processors thus monitor if a rotation speed limit has been exceeded and/or execute corresponding response actions. The method also recognizes faults in the power section based on the evaluation of the phase current. The system can also be designed to manage pulling loads.
A method for monitoring a speed of an electric machine, comprising the steps of:
A device for monitoring a speed of an electric machine, comprising:
A numerical control system, comprising a device for monitoring a speed, said device including a first processor performing a first monitoring function and implemented as a control processor, and a second processor performing a second monitoring function different from the first monitoring function and implemented as a communication processor, and a communication link connecting the first processor and the second processor, said communication link exchanging measurement results between the first processor and the second processor for cross-comparing the measurement results.
Dependencies are inferred from the claim text.