ELECTRIC ACTUATOR FOR VEHICLE TRANSMISSION SYSTEM

The invention relates to an actuator (2) for a vehicle transmission system (3), comprising: an electric machine (6) comprising an armature and an inductor, the machine (6) being such that the ratio of a magnitude representing the electromagnetic torque (T) exerted on the machine (6) to a magnitude representing the current (I) flowing through the electric circuit of the armature involves a constant (K), wherein (K) is the torque constant of the electric machine (6); a static converter (31) comprising a plurality of switching cells (41), the static converter (31) being arranged so as to connect the electric circuit of the armature electrically to an electric power source; and a system (32) for controlling the switching cells (41) of the static converter (31), said system being configured to apply a first control mode to the switching cells (41) so that the torque constant (K) of the electric machine (6) adopts a first value, and to apply a second control mode to the switching cells (41) so that the torque constant (K) of the electric machine varies continuously within a second range of values.