Patent ID: 6396236
Filing Date: 2002-05-28
Classification: H02P

Abstract:
A method of minimizing errors in a rotor angle estimate in a synchronous machine, the method comprising the steps of:determining a stator flux (&psgr;ssest) of the synchronous machine on the basis of a current model of the synchronous machine, determining a stator flux (&psgr;ssuâ€²) on the basis of a voltage integral and initial value (&psgr;ssu(nâˆ’1)) of the stator flux, determining a rotor angle (&thgr;est(n)) of the synchronous machine, determining an angle correction term (&thgr;k(n)) on the basis of the determined stator fluxes (&psgr;ssest, &psgr;ssuâ€²), and adding the angle correction term (&thgr;k(n)) to the determined rotor angle (&thgr;est(n)) of the synchronous machine to obtain the rotor angle estimate (&thgr;(n)).