Method and apparatus for current control of a permanent magnet field oriented controlled synchronmotor with trapezoidal e.m.f

摘要

A method for current control of field orientated driven, permanently excited sync machine with trapezoidal. EMF in which a flux forming actual current component (isd) and a torque forming actual current component (isq) are each controlled to a nominal current component (i'sd, i'sq), in which a controller manipulated variable is superimposed with a pre-control variable, in which these formed manipulated variable components are converted into polar manipulated variable components in which in dependence on position signals (Lrst) on one side a variable flux angle which changes abruptly is determined and on the other side a constantly changing flux angle is determined, by means of an ascertained stator frequency (ws). In the lower revs range a stator orientated position (alpha u) of the setting variables (us) is determined from the abruptly changing flux angle and in the remaining flux range from the constantly changing flux angle, by means of the field orientated position (beta s).