A stator section for an axial flux electric machine with liquid cooling system, comprising: - a toroidal core having an inside cylindrical surface and an outside cylindrical surface coaxial with each other along a reference axis that is to be made coincide with the axis of rotation of a rotor section of an axial flux electric machine; - liquid cooling means; - a plurality of electrical conductor coils spaced from each other and distributed along the annular centre line of the core; where: - each coil: has the shape of a solid with a hole passing through it, can be divided into four consecutive sides (41, 42, 43, 44) running round the through hole, is placed around the core with a first side of it lying on the outside cylindrical surface, a second side of it lying on the inside cylindrical surface and a third and fourth side of it (43, 44) lying transversally to the first and second sides (41, 42); wherein: - the liquid cooling means comprise a plurality of cooling duct sections through which a liquid coolant can flow; - each cooling duct section is in one of the two following, alternative conditions: either it is interposed between the first sides of two consecutive coils along the annular centre line of the core at a radial distance from the reference axis greater than or equal to the radius of the outside cylindrical surface, or it is interposed between the second sides of two consecutive coils along the annular centre line of the core at a radial distance from the reference axis less than or equal to the radius of the inside cylindrical surface; - each cooling duct section produces a movement of the liquid coolant from a first to a second reference plane (23, 24), both perpendicular to the reference axis, spaced from each other along the reference axis and corresponding, respectively, to at least one portion of a first base surface of the core and at least one portion of a second base surface of the core; - at least the first or the second side (41, 42) of each coil is adjacent to and in contact with at least one respective cooling duct section of the plurality of cooling duct sections; - in each coil each side (41,42,43,44) has a first side face (411,421,431,441) adjoining a first opening of the through hole and a second side face (412,422,432,442) adjoining a second opening of the through hole on the side of the through hole opposite the first opening; - if adjacent to, and in contact with, the first side, said cooling duct section is adjacent to, and in contact with, either the first side face or the second side face of the first side itself; if adjacent to, and in contact with, the second side, said the cooling duct section is adjacent to, and in contact with, either the first side face or the second side face of the second side itself. - a toroidal core having an inside cylindrical surface and an outside cylindrical surface coaxial with each other along a reference axis that is to be made coincide with the axis of rotation of a rotor section of an axial flux electric machine; - liquid cooling means; - a plurality of electrical conductor coils spaced from each other and distributed along the annular centre line of the core; where: - each coil: has the shape of a solid with a hole passing through it, can be divided into four consecutive sides (41, 42, 43, 44) running round the through hole, is placed around the core with a first side of it lying on the outside cylindrical surface, a second side of it lying on the inside cylindrical surface and a third and fourth side of it (43, 44) lying transversally to the first and second sides (41, 42); wherein: - the liquid cooling means comprise a plurality of cooling duct sections through which a liquid coolant can flow; - each cooling duct section is in one of the two following, alternative conditions: either it is interposed between the first sides of two consecutive coils along the annular centre line of the core at a radial distance from the reference axis greater than or equal to the radius of the outside cylindrical surface, or it is interposed between the second sides of two consecutive coils along the annular centre line of the core at a radial distance from the reference axis less than or equal to the radius of the inside cylindrical surface; - each cooling duct section produces a movement of the liquid coolant from a first to a second reference plane (23, 24), both perpendicular to the reference axis, spaced from each other along the reference axis and corresponding, respectively, to at least one portion of a first base surface of the core and at least one portion of a second base surface of the core; - at least the first or the second side (41, 42) of each coil is adjacent to and in contact with at least one respective cooling duct section of the plurality of cooling duct sections; - in each coil each side (41,42,43,44) has a first side face (411,421,431,441) adjoining a first opening of the through hole and a second side face (412,422,432,442) adjoining a second opening of the through hole on the side of the through hole opposite the first opening; - if adjacent to, and in contact with, the first side, said cooling duct section is adjacent to, and in contact with, either the first side face or the second side face of the first side itself; if adjacent to, and in contact with, the second side, said the cooling duct section is adjacent to, and in contact with, either the first side face or the second side face of the second side itself.