Frequency converter for AC motor

Electricity: motive power systems – Induction motor systems – Primary circuit control

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318803, 318811, H02P 528

Patent

active

059558628

ABSTRACT:
A frequency converter for an asynchronous motor including a voltage converter (O) equipped with switches (Sa, Sb, Sc) controlled by a control circuit (CC) and powered by a DC bus (B) on which a shunt (Sh) is installed to measure a DC current passing through the bus, wherein, when at least one of two components of an output voltage vector Vs is less than a predetermined value TMIN, the frequency converter includes a device which calculates firstly a vector Vs' each of two components thereof being at least equal to the predetermined value TMIN, and secondly a vector Vs" such that vectorial average of Vs' and Vs" is equal to the output vector Vs.

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