Method and device for controlling three-phase motor

A device for controlling a three-phase motor using a maximum torque per ampere field module and a direct flux vector control module, characterized in that the device comprises circuitry for:

• determining by the direct flux vector control module reference voltages in a fτ framework from an estimated flux norm, a reference flux, a measured current motor vector in a fτ framework using an estimated load angle and a reference current in a t axis that is obtained from a reference torque and the reference flux,
• summing the reference voltages transformed in a stator αβ framework with a high frequency injection voltage,
• driving the motor with the summed voltages,
• measuring a motor current vector,
• determining the high frequency injection voltage from the measured motor current vector and a high frequency sinewave signal, so that the high frequency current response of the motor to the high frequency voltage is perpendicular to the measured motor current vector,
• determining an estimated flux from the measured motor currents and the voltage references,
• determining, by the maximum torque per ampere field module, from the estimated flux and the high frequency sinewave signal, the reference flux to be provided to the direct flux vector control module so that the high frequency flux response to the injected voltage is aligned with the measured current vector.