Electromagnetic induction device configured as a multiple magnetic circuit

1. An electromagnetic induction device ( 1 ) comprising a closed magnetic circuit ( 2 ), without air gap, of which at least one first part ( 11 ) extends longitudinally along a longitudinal axis, the longitudinal axis being substantially rectilinear, said first part being surrounded by a sleeve ( 3 ), said sleeve ( 3 ) being surrounded by an electrical conductor ( 4 ) which comprises at least one metal sheet electrically insulated on at least one of its faces, wherein

said first part ( 11 ) of said closed magnetic circuit ( 2 ) has a section of circular form;

said closed magnetic circuit ( 2 ) is layered by several layers of magnetic material separated by an electrical insulation, and

said sleeve ( 3 ) comprises an inner face ( 7 ) having a circular section closely fitting the form of said magnetic circuit ( 2 ) to allow a rotation of the sleeve around the closed magnetic circuit about the longitudinal axis of the first part, and an outer face ( 8 ) comprising curved parts ( 19 ) and planar parts ( 20 ).

2. The electromagnetic induction device ( 1 ) as claimed in the preceding claim, wherein at least one said sleeve ( 3 ) comprises a main axis, an inner face ( 7 ) of which the form of a section is circular and closely fits the form of said magnetic circuit ( 2 ), and an outer face ( 8 ) defined by a set of straight lines parallel to said main axis, comprising said curved parts ( 19 ) and said planar parts ( 20 ).

3. The electromagnetic induction device ( 1 ) as claimed in claim 1 , wherein said magnetic circuit ( 2 ) comprises at least one second part ( 12 ) which has at least one planar surface ( 13 ).

4. The electromagnetic induction device ( 1 ) as claimed in claim 1 , wherein said magnetic circuit ( 2 ) comprises at least one sheet of magnetic material ( 18 ) electrically insulated on at least one of its faces and wound over at least one element chosen from at least one other said sheet of magnetic material ( 18 ) and itself.

5. The electromagnetic induction device ( 1 ) as claimed in claim 1 , wherein each said sleeve ( 3 ) comprises several parts ( 6 ) adapted to cooperate to surround said magnetic circuit ( 2 ).

6. The electromagnetic induction device ( 1 ) as claimed in claim 1 , wherein said sleeve ( 3 ) comprises at least one engaging means ( 17 ) adapted to transmit a drive to allow the rotation of said sleeve ( 3 ) about said longitudinal axis of said first part ( 11 ), in order to wind and order at least one said electrical conductor ( 4 ) in sheet form around said sleeve ( 3 ).

7. The electromagnetic induction device ( 1 ) as claimed in claim 1 comprising two planar electrical conductors ( 16 ) in electrical contact with one said electrical conductor ( 4 ) and arranged so as to form the terminals of said electrical conductor ( 4 ).

8. The electromagnetic induction device ( 1 ) as claimed in claim 1 , comprising a local heat exchanger ( 15 ) in contact with said magnetic circuit ( 2 ) outside of said at least one first part.

9. The electromagnetic induction device ( 1 ) as claimed in claim 8 , wherein said local heat exchanger ( 15 ) comprises at least one surface closely fitting the form of said magnetic circuit ( 2 ) and at least one planar surface ( 22 ).

10. The electromagnetic induction device ( 1 ) as claimed in claim 9 , wherein a section of said magnetic circuit ( 2 ) is of circular form along the contact with said local heat exchanger ( 15 ).

11. The electromagnetic induction device ( 1 ) as claimed in claim 9 , wherein several surfaces chosen from at least one said planar surface of said magnetic circuit ( 13 ) and at least one said planar surface of said local heat exchanger ( 22 ) is coplanar and adapted to be placed in contact with at least one planar heat exchanger ( 14 ).