Method for determining starting rotor position and revs for permanent magnet excited synchronous machine, involves calculating minimal value depending on current response for switch-on period of zero voltage vector

摘要

A method for determining a stator position (gamma) and revs (omega) for converter-fed permanent magnet excited synchronous machine not equipped with position and revs sensors, in which for a given switch-on period (delta t) a zero-voltage vector (V7,V8) is switched to the sync machine, in which during this switching period (delta p) a current response (iu,iv) is measured and a pulse inhibitor is switched. From the current response, a current quantity and a current angle (epsilon i) of an associated current space vector is calculated, in which these procedural steps are repeated after a given time and in which from the calculated current values (ik1, ik2) and current angles (epsilon k1, epsilon k2) and a starter rotor position (gamma) and revs (omega) are determined. For the switch-on duration (delta t) of the first zero current vector (v7,v8) a minimal value (delta t1) is calculated which is extended in relation to a current response (iu,iv) so that after switching one or more further zero voltage vectors (v7,v8), a current response (iu,iv) with current value (i sol) is adjusted and the second zero voltage vector is switched to the synchronous machine for this extended switch on period.