Method and apparatus for direct torque control of three-phase machine

摘要

The method involves controlling a torque of a rotation field machine (1) which is supplied by a multiple phase converter (2) over a sinusoid filter. A current flow through the filter and/or a filter output voltage is measured, and the nominal current flow and the nominal torque value are corrected according to the measured voltage and/or current. The correction includes a transformation of the filter output voltage in a first component, vertical to a stator flow, and a second component, parallel to the stator flow, as well as a decrease of the nominal torque- and current flow values, proportionally to the oscillating part of the filter output voltage.