Separately excited electric machine with at least one primary magnetic circuit and at least two secondary magnetic circuits

A separately excited electric machine comprising:

• an axis of rotation;
• a stator provided with a structural member and a plurality of windings of annular shape around the axis of rotation;
• a rotor rotatable about the axis of rotation and provided with a structure and a plurality of strips, the strips being regularly distributed angularly around the axis of rotation, each strip being made of ferromagnetic material and being magnetically isolated from the other strips;
• the stator having at least one exciter unit, the exciter unit being provided with two secondary magnetic circuits and one primary magnetic circuit, the primary magnetic circuit co-operating with the secondary magnetic circuits;
• each secondary magnetic circuit having a respective stator exciter winding and two annular yokes;
• and
• each primary magnetic circuit comprising a rotor exciter winding for passing direct current;
• wherein:
• each yoke is of C-shaped section and comprises three flanks, comprising two extreme flanks and a central flank, and a plurality of teeth each having a base and a tip, the teeth being distributed over at least one extreme flank in angularly regular manner around the axis of rotation, the base being connected to the central flank, the stator exciter winding being positioned inside the yokes and being for passing an alternating current;
• the teeth of the two yokes of a secondary magnetic circuit interfitting mutually in one another over at least one face of the stator exciter winding of the secondary magnetic circuit facing the strips while maintaining a first distance between one another;
• a tooth of one secondary magnetic circuit being collinear with a tooth of the other secondary magnetic circuit of the exciter unit, the tips of the two collinear teeth pointing in the same direction, the tips and the bases of these two teeth being in alignment;
• each strip having at least one first north pole and at least one first south pole as a result of first magnetic fluxes circulating in the strips on being generated by the rotor exciter winding;
• the teeth including in alternation second north poles and second south poles as a result of second magnetic fluxes generated by the stator exciter windings circulating in the yokes, the teeth of a yoke having the second poles of the same polarity, two adjacent teeth of two yokes having the second poles of opposite polarities;
• an airgap thus being formed between the first poles of the strips and the second poles of the yokes;
• and
• each yoke having the same number of teeth, the number of teeth of a secondary magnetic circuit being equal to the number of strips co-operating with the secondary magnetic circuits, the total number of first poles of the electric machine being equal to the total number of second poles of the electric machine.