The invention discloses a method for controlling direct torsion /
flux linkage of a
permanent magnet synchronous motor. The method comprises the steps of collecting three-phase
stator voltage and currents of the motor, and obtaining
voltage and currents under a two-phase static coordinate
system through three-phase / two-phase static coordinate conversion; calculating actual feedback value of
electromagnetism torsion and
stator flux linkage according to the
voltage and the currents under the two-phase static coordinate
system; obtaining initial given value of the
electromagnetism torsion through a PI controller according to difference between given rotating speed and feedback rotating speed; obtaining given value of the
electromagnetism torsion and the
stator flux linkage according to a given electromagnetism torsion and stator flux linkage calculating module; obtaining given voltage on an alpha beta shaft of the two-phase static coordinate
system through a given voltage calculating module; generating switching signals of an
inverter through
space vector pulse width modulation, triggering a switching device of the
inverter, and realizing direct torsion / flux linkage control of the
permanent magnet synchronous motor. The method realizes low, medium and high speed wide range operation of the
permanent magnet synchronous motor, does not need to rotate coordinate conversion, and has the advantages of being convenient to calculate, quick in dynamic response, strong in robustness, and the like.