Method for determining a direct-axis inductance and a quadrature-axis inductance of an electric machine, corresponding computer program and device

A device for determining a direct inductance and a quadrature, inductance of an electrical machine, the device comprising:

• a control module of an inverter designed to respectively provide phase voltages to the stator phase windings of the electrical machine, such that a stator of the electrical machine generates a magnetic field comprising:
• a first magnetic field rotating at a rotation frequency, so as to rotationally drive a rotor (104) of the electrical machine, and
• a second magnetic field, called test magnetic field, that varies periodically at a second frequency, called test frequency,
• a module for determining an amplitude spectrum with an electrical quantity determined from at least one portion of the phase currents flowing through the stator phase windings of the electrical machine during control of the electrical machine,
• a module for searching in the amplitude spectrum for at least one peak present at a frequency that is dependent on the test frequency and for determining an amplitude for each peak found,
• a module designed to determine the direct inductance and the quadrature inductance based on the amplitudes of the two peaks found.