Patent ID: 9294029
Filing Date: 2016-03-22
CPC Classification: H02P

Claim Text:
1. A method of estimating a rotor orientation of a synchronous reluctance motor at a start-up, the motor including a stator and a rotor, wherein an inductance of the rotor in rotor coordinates is represented by a rotor quadrature axis inductance component (L q ) and a rotor direct axis inductance component (L d ), at least one of the rotor inductance components being known, wherein the method comprises: setting a value for a stator control reference; inducing a stator flux on the basis of the stator control reference; determining the stator flux and a stator current; forming a first estimate of the rotor orientation on the basis of the stator flux, the stator current, and only one of the known rotor inductance components; determining the rotor orientation on the basis of the first estimate; and updating the stator control reference so that the stator flux follows the determined rotor orientation.