Method for controlling a three-phase electric machine and control unit and system thereof

A method for controlling a three-phase electric machine by way of a control unit operatively connected to a controller, to a sensor, and to an inverter operatively connected to said three-phase electric machine, said method comprising:

• a first acquisition phase, wherein the control unit receives, from said controller, a first signal representative of a reference torque (T*);
• a second acquisition phase, wherein the control unit receives, from said sensor, at least one further signal representative of one or more of the following quantities:
• an electric quantity of the inverter, an electric quantity of the three-phase electric machine, and a mechanical quantity of the three-phase electric machine;
• a control phase, wherein the control unit generates a control signal (d*abc) that is inputted to the inverter for generating an effective torque ({tilde over (T)}) of the three-phase electric machine, wherein said control signal (d*abc) is determined on the basis of a reference stator voltage (v*dqs),
• wherein said reference stator voltage (v*dqs) is determined by the control unit as a function of a reference amplitude value (A*) and a reference load angle value (δ*) of a stator magnetic flux vector (λs) of said three-phase electric machine, wherein said reference amplitude value (λ*) and said reference load angle value (δ*) are determined on the basis of said first signal and said at least one further signal.