An electric machine comprising a first part and a second part separated by a radial working gap and placed coaxially with one of them embracing the other, wherein - the first and the second parts are mounted so that one of them can rotate around a rotation axis with the other remaining fixed; - the first part comprises magnetic poles (N, S) which magnetic poles are distributed with a polarity alternation within one circular row, wherein the magnetic pole is a surface of a body made of magnetic material facing the radial working gap with a non-zero normal component of magnetization; - the second part comprises electromagnets spaced from each other and placed on a non-ferromagnetic base in a circular row; - each magnetic conducting element of the electromagnet has a central pole part and two lateral pole parts (19, 20) connected to the central pole part and spaced from opposing sides (23, 24) of the central pole part by linking pieces (21, 22); each pole part (18, 19, 20) of the magnetic conducting element has a pole surface (18a, 19a, 20a) facing the radial working gap wherein the pole surfaces (19a, 20a) of the lateral pole part (19, 20) are turned towards the radial working gap in such a way that the centers of the pole surfaces (18a, 19a, 20a) are located on one circumference with its center on the rotation axis; - a winding of the electromagnet is situated on the central pole part of the magnetic conducting element; - for each pair of the adjacent magnetic poles (N-S) in the circular row, an angle (φ) between two planes intersecting along the rotation axis, one of which passes through the center of one magnetic pole and the other passes through the center of the other magnetic pole, has essentially the same value, wherein the angle (φ) is identified as the angle between the magnetic poles; - an angle (δ) between two planes intersecting along the rotation axis, one of which passes through the center of the pole surface of the central pole part and the other passes through the center of the pole surface (19a, 20a) of the lateral pole part (19, 20), is in a range of 0.7 to 1.3 of the angle (φ) between the magnetic poles, wherein the angle (δ) is identified as the angle between the pole surfaces, characterized in that - the magnetic poles (N, S) are coupled by a magnetic circuit, and - an angular dimension (β) of the pole surface of the central pole part is chosen from a range of 0.7 to 0.8 of an angular dimension (α) of the magnetic pole (N, S), wherein the angular dimension of a surface is the value of the angle between two planes, intersecting along the rotation axis, that are tangent to circularly opposite sides of the surface. - the first and the second parts are mounted so that one of them can rotate around a rotation axis with the other remaining fixed; - the first part comprises magnetic poles (N, S) which magnetic poles are distributed with a polarity alternation within one circular row, wherein the magnetic pole is a surface of a body made of magnetic material facing the radial working gap with a non-zero normal component of magnetization; - the second part comprises electromagnets spaced from each other and placed on a non-ferromagnetic base in a circular row; - each magnetic conducting element of the electromagnet has a central pole part and two lateral pole parts (19, 20) connected to the central pole part and spaced from opposing sides (23, 24) of the central pole part by linking pieces (21, 22); each pole part (18, 19, 20) of the magnetic conducting element has a pole surface (18a, 19a, 20a) facing the radial working gap wherein the pole surfaces (19a, 20a) of the lateral pole part (19, 20) are turned towards the radial working gap in such a way that the centers of the pole surfaces (18a, 19a, 20a) are located on one circumference with its center on the rotation axis; - a winding of the electromagnet is situated on the central pole part of the magnetic conducting element; - for each pair of the adjacent magnetic poles (N-S) in the circular row, an angle (φ) between two planes intersecting along the rotation axis, one of which passes through the center of one magnetic pole and the other passes through the center of the other magnetic pole, has essentially the same value, wherein the angle (φ) is identified as the angle between the magnetic poles; - an angle (δ) between two planes intersecting along the rotation axis, one of which passes through the center of the pole surface of the central pole part and the other passes through the center of the pole surface (19a, 20a) of the lateral pole part (19, 20), is in a range of 0.7 to 1.3 of the angle (φ) between the magnetic poles, wherein the angle (δ) is identified as the angle between the pole surfaces, - the magnetic poles (N, S) are coupled by a magnetic circuit, and - an angular dimension (β) of the pole surface of the central pole part is chosen from a range of 0.7 to 0.8 of an angular dimension (α) of the magnetic pole (N, S), wherein the angular dimension of a surface is the value of the angle between two planes, intersecting along the rotation axis, that are tangent to circularly opposite sides of the surface.