Abstract
The new method of frequency converter output voltage amplitude control based on the tracing of minimum value of AC induction motor phase current amplitude has been proposed. The voltage amplitude is controlled in real time in such a way that for a given instant motor load and speed the phase current amplitude would be minimal, i.e. the efficiency of the motor would be maximal. The realization of the developed method is less complicated comparing to vector control. It can be applied in the situations when motor load changes randomly and the fast response of the motor supply voltage amplitude is not needed.
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