Patent ID: 9664499
Date: 2017-05-30
CPC Classifications: G01B,G01D,H02P

Claim:
1. A method for determining the angular offset between the rotor and the stator of an electrical machine, the rotor being supplied with a rotor excitation current and voltage, the stator being supplied on three phases with stator phase currents and voltages, characterized in that it comprises the following steps: verifying that the electrical machine is at rest, applying a rotor excitation signal for a duration capable of causing partial magnetization of the rotor, applying a rotor deexcitation signal capable of causing active and rapid demagnetization of the rotor, while measuring the stator phase currents during the demagnetization, and while maintaining zero voltages between the phases of the stator, determining direct stator currents and quadrature stator currents, corresponding to the stator phase currents measured by applying the Park-Clarke transformation and as a function of a measurement of the electrical position of the rotor, determining the maximum values among the direct stator currents and the quadrature stator currents, transmitting an angular setting fault signal if the absolute value of the maximum value of the quadrature stator current is greater than a threshold value, determining an angular offset correction in radians by calculating the arctangent of the ratio of the maximum value of the quadrature stator current and the maximum value of the direct stator current.