Method and system for controlling a brushless electric motor

Abstract

A method for closed-loop control of the velocity of a brushless d.c. motor that supplies a torque (τ) to a rotating mechanical member, including carrying out a control of a FOC (Field-Oriented Control) type (10, 20) comprising obtaining (16), from a triad of stator phase currents (Ia, Ib, Ic) of the motor, a pair of currents (Id, Iq) in a reference system (d, q) of rotation of the motor (15), and obtaining from a corresponding pair of voltages (Vq, Vd) in a reference system of rotation of the motor (15) a triad of phase voltages (Va, Vb, Vc) of the motor (15), a quadrature voltage (Vq) of said corresponding pair of voltages (Vq, Vd) being obtained via a closed-loop control procedure (140) comprising measuring (130) an orientation of the rotor (θ), said control method (100) comprising (110) acquiring a reference angular velocity (ω*) of the motor to be supplied to the control of a FOC type (10, 20); according to the invention, said closed-loop control procedure (140) comprises regulating the orientation of the rotor (θ ) to follow a reference orientation (θ*), which forms an angle of 90° with respect to a direction of a stator magnetic field (B), which rotates with an angular velocity equal to said reference angular velocity (ω*).

Dependencies are inferred from the claim text.