Inductive device

An inductive device comprising:

• a toroidal core,
• at least one electric conductor wound around the toroidal core and constituting at least one winding, portions of the electric conductor on an outer perimeter of the winding being straight and parallel with an axial direction of the toroidal core, and
• a cooling element constituting a cylindrical cavity containing the toroidal core and the electric conductor so that the axial direction of the toroidal core is parallel with an axial direction of the cylindrical cavity and distances from a wall of the cylindrical cavity to different ones of the portions of the electric conductor are substantially equal,
• wherein a shape of the wall of the cylindrical cavity and a cross-sectional shape of the electric conductor are adapted to match each other so that at least one of the following deviates from a circular shape so as to improve heat transfer from the electric conductor to the wall of the cylindrical cavity:
• i) the cross-sectional shape of the electric conductor and ii) a cross-sectional shape of the cylindrical cavity in a geometric plane perpendicular to the axial direction of the cylindrical cavity.