Patent ID: 9444386
Filing Date: 2016-09-13
CPC Classification: H02P

Claim Text:
1. A method for controlling an electrical machine comprising two multiphase stator windings, the method comprising: controlling power stages connected to the multiphase stator windings on the basis of four rotation-converted stator currents expressed in a coordinate system bound to a rotor of the electrical machine and on the basis of a model of the electrical machine modeling at least inductances of the two multiphase stator windings and mutual inductances between the two multiphase stator windings, converting stator phase currents of the two multiphase stator windings into the four rotation-converted stator currents with a conversion rule corresponding to a form of the model of the electrical machine where each of stator flux-linkages of the model is dependent on only one of the rotation-converted stator currents when inductance parameters of the model are unaltered, and obtaining a position angle of the rotor and using the obtained position angle of the rotor in the conversion of the stator phase currents of the two multiphase stator windings into the four rotation-converted stator currents, wherein inductance coefficients between the stator flux-linkages of the model and the rotation-converted stator currents are proportional to: L d +M d , L q +M q , L d −M d , and L q −M q , where L d is a direct-axis inductance, M d is a direct-axis mutual inductance between the two multiphase stator windings, L q is a quadrature-axis inductance, and M g is a quadrature-axis mutual inductance between the two multiphase stator windings.