Abstract
In order to control ac. drives requiring high dynamics an accurate knowledge of the speed and the rotor flux of the driving asynchronous machine is necessary, irrespective of the operation point. Since every operation point is uniquely assigned to a certain flux of the rotor as well as a certain speed, it is possible to determine these quantities by measuring the currents and voltages at the terminals. In the case of instationary operation mode and non-monofrequent terminal voltage, the estimates are not influenced by the temperature of the asynchronous machine. By applying the technique of the MOD-functions it is possible to achieve a suitable difference equation from the mathematical model of the asynchronous machine without having to solve the original equation. This method, moreover, leads to an estimate of the electrical moment simultaneously. The required quantities are obtained by simple manipulations of the measured quantities. An implementation on a microprocessor for on-line operation is possible, due to the simplicity of the algorithm based on this method.
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