An electromechanical actuator comprising a brushless DC electric motor with electronic switching, the motor comprising a rotor and a stator that are positioned coaxially around an axis of rotation, in which: a- the rotor comprises a rotor body provided with magnetic elements surrounded by the stator, each magnetic element having an angular width defined as the apical angle of an angular sector of minimum area, centered on the axis of rotation in radial cross-section the electric motor and which includes this magnetic element, b- said magnetic elements of the rotor are located on the outer circumference of the stator body and these magnetic elements making up pairs of poles, and a permanent magnet, c- the stator is formed by a stator core including polar elements distributed on the periphery of the stator, with windings located around the polar elements, d- the polar elements of the stator have an angular polar opening width, defined as the apical angle of an angular sector centered on the axis of rotation and delimited by two straight lines respectively passing through the two ends of a part of that element that defines an air gap separating, radially, with respect to the rotation axis, the permanent magnet made up by the magnetic elements from the stator, this angle being defined in a plane radial to the rotation axis and containing the polar element, said angular polar opening being smaller than the angular width (α1) of the magnetic elements of the rotor, e- the stator core is in a magnetizable material, f- the stator comprises, on its outer circumference, a cylinder head centered on the axis of rotation and which allows the flow of the magnetic flux, and g- the stator defines a cylindrical inner space, with a circular section, in which the rotor is located and inside which the rotor can rotate, h- the cylindrical inner space also receives at least one bearing (26, 27) for providing rotational support for a rotor shaft, characterized in that: i- the angular polar opening width of the polar elements of the stator is at least two times smaller than the angular width (α1) of the magnetic elements of the rotor, j- the number of pairs of poles of the rotor is two or four, k- the angular polar opening width of the polar elements of the stator is comprised in a range between 20° and 40°, I- the number of polar elements of the stator is six, and m- the stator core comprises magnetic short circuit connectors connecting two polar elements to each other, the magnetic short circuit connectors corresponding to mechanical links between two polar elements and channeling part of the magnetic flux generated by the electric motor inside the stator core. a- the rotor comprises a rotor body provided with magnetic elements surrounded by the stator, each magnetic element having an angular width defined as the apical angle of an angular sector of minimum area, centered on the axis of rotation in radial cross-section the electric motor and which includes this magnetic element, b- said magnetic elements of the rotor are located on the outer circumference of the stator body and these magnetic elements making up pairs of poles, and a permanent magnet, c- the stator is formed by a stator core including polar elements distributed on the periphery of the stator, with windings located around the polar elements, d- the polar elements of the stator have an angular polar opening width, defined as the apical angle of an angular sector centered on the axis of rotation and delimited by two straight lines respectively passing through the two ends of a part of that element that defines an air gap separating, radially, with respect to the rotation axis, the permanent magnet made up by the magnetic elements from the stator, this angle being defined in a plane radial to the rotation axis and containing the polar element, said angular polar opening being smaller than the angular width (α1) of the magnetic elements of the rotor, e- the stator core is in a magnetizable material, f- the stator comprises, on its outer circumference, a cylinder head centered on the axis of rotation and which allows the flow of the magnetic flux, and g- the stator defines a cylindrical inner space, with a circular section, in which the rotor is located and inside which the rotor can rotate, h- the cylindrical inner space also receives at least one bearing (26, 27) for providing rotational support for a rotor shaft, i- the angular polar opening width of the polar elements of the stator is at least two times smaller than the angular width (α1) of the magnetic elements of the rotor, j- the number of pairs of poles of the rotor is two or four, k- the angular polar opening width of the polar elements of the stator is comprised in a range between 20° and 40°, I- the number of polar elements of the stator is six, and m- the stator core comprises magnetic short circuit connectors connecting two polar elements to each other, the magnetic short circuit connectors corresponding to mechanical links between two polar elements and channeling part of the magnetic flux generated by the electric motor inside the stator core.