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1. An N-phase electric machine comprising a movable member mounted so as to move with respect to a fixed member, a system for determining at least one item of information relating to the movement of said movable member and an electric power supply system which is managed by said item of information, said determination system comprising an encoder secured to the movable member which is able to generate a signal representative of its movement and a sensor secured to the fixed member which is able to determine said item of information by reading the signal generated by said encoder, said encoder having a magnetic track formed by a succession of npp pairs of North and South magnetic poles with a width Lp which are disposed so as to deliver a pseudo -sinusoidal magnetic field, the fixed member having an armature made of a ferromagnetic material which is equipped with at least one conductive coil per phase, said coils being electrically connected to the power supply system while being magnetically coupled to the track of the encoder, the armature having pads around which a coil is respectively arranged, the pads projecting in the interface with the encoder while each having a free surface disposed opposite the magnetic track, said free surface having teeth with a width Ld spaced apart by hollows with a width Le, the widths Ld and/or Le being such that their ratio to N*Lp is neither even nor inversely even so as to direct the magnetic flux between the coil and the encoder so that the supply of electric power to the coils causes the encoder to move and/or the movement of the encoder causes electric power to be supplied to said coils.
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