Arrangement of a stator segment of an electrical machine, wherein - the electrical machine comprises a rotor which is rotatably mounted about an axis of rotation, - the stator segment comprises a stator core with a plurality of winding slots, each winding slot extending along the axis of rotation and circumferentially spaced to each other with regard to the axis of rotation, - the arrangement comprises at least one group of three windings (31, 32, 33), each of the three windings (31, 32, 33) being shaped as a closed loop, the loop thus defining an inner area of the winding and an outer area with regard to the winding, - each winding comprises a straight first winding segment, a straight second winding segment and a winding head, - each first winding segment is substantially parallel to each second winding segment, - the first winding segment of the first winding is arranged and prepared to be embedded in a first winding slot and the second winding segment of the first winding is arranged and prepared to be embedded in a fourth winding slot, wherein the fourth winding slot is the third adjacent winding slot with regard to the first winding slot, - each winding head comprises a winding head closure (36, 37, 38) with a winding head closure inner surface facing to the inner area, and a substantially rectangular winding head closure outer surface facing to the outer area, - at least two of the three winding head closure outer surfaces are substantially parallel to each other, and - the three windings (31, 32, 33) are arranged and prepared to be embedded in the winding slots such that each of the three winding heads is shifted with regard to the other two winding heads, characterised in that - the group of three windings (31, 32, 33) comprises an upper winding with an upper winding head closure, a middle winding with a middle winding head closure and a lower winding with a lower winding head closure, wherein the windings (31, 32, 33) are arranged and prepared to be embedded in the winding slots such that - the lower winding head closure is radially more inward with regard to the axis of rotation than the middle winding head closure, - the middle winding head closure is radially more inward with regard to the axis of rotation than the upper winding head closure; - wherein the middle winding is inserted into a second winding slot and a fifth winding slot and the upper winding is inserted into a third winding slot and a sixth winding slot; and - for each winding a radial extension of the first winding segment and/or a radial extension of the second winding segment is larger, in particular at least three times larger, compared to a radial extension of the winding head closure (36, 37, 38). - the electrical machine comprises a rotor which is rotatably mounted about an axis of rotation, - the stator segment comprises a stator core with a plurality of winding slots, each winding slot extending along the axis of rotation and circumferentially spaced to each other with regard to the axis of rotation, - the arrangement comprises at least one group of three windings (31, 32, 33), each of the three windings (31, 32, 33) being shaped as a closed loop, the loop thus defining an inner area of the winding and an outer area with regard to the winding, - each winding comprises a straight first winding segment, a straight second winding segment and a winding head, - each first winding segment is substantially parallel to each second winding segment, - the first winding segment of the first winding is arranged and prepared to be embedded in a first winding slot and the second winding segment of the first winding is arranged and prepared to be embedded in a fourth winding slot, wherein the fourth winding slot is the third adjacent winding slot with regard to the first winding slot, - each winding head comprises a winding head closure (36, 37, 38) with a winding head closure inner surface facing to the inner area, and a substantially rectangular winding head closure outer surface facing to the outer area, - at least two of the three winding head closure outer surfaces are substantially parallel to each other, and - the three windings (31, 32, 33) are arranged and prepared to be embedded in the winding slots such that each of the three winding heads is shifted with regard to the other two winding heads, - the group of three windings (31, 32, 33) comprises an upper winding with an upper winding head closure, a middle winding with a middle winding head closure and a lower winding with a lower winding head closure, wherein the windings (31, 32, 33) are arranged and prepared to be embedded in the winding slots such that - the lower winding head closure is radially more inward with regard to the axis of rotation than the middle winding head closure, - the middle winding head closure is radially more inward with regard to the axis of rotation than the upper winding head closure; - wherein the middle winding is inserted into a second winding slot and a fifth winding slot and the upper winding is inserted into a third winding slot and a sixth winding slot; and - for each winding a radial extension of the first winding segment and/or a radial extension of the second winding segment is larger, in particular at least three times larger, compared to a radial extension of the winding head closure (36, 37, 38).