Electric machine

An electrical machine having an axis of rotation and comprising:

• a casing comprising:
• a base wall transversal to the axis of rotation;
• at least one projection projecting from the base wall towards an inside of the casing according to a direction parallel to the axis of rotation,
• a stator, comprising:
• a ferromagnetic core including a plurality of pole shoes each having a respective end,
• at least one conductor wound on the plurality of pole shoes to form a plurality of coils forming a stator winding,
• a shaped insulator interposed between the ferromagnetic core and the stator winding, with a first coil of the plurality of coils of the stator winding comprising a predetermined number of turns wound on a first one of the plurality of pole shoes and including an end portion engaged with the projection,
• wherein the shaped insulator comprises for the first coil, a first housing for a first number of first turns of the predetermined number of turns and a second housing for a second number of second turns of the predetermined number of turns, the first turns being positioned in the first housing and the second turns being positioned in the second housing, the first housing including a first base wall positioned outward from the first one of the plurality of pole shoes and the second housing including a second base wall positioned outward from the first one of the plurality of pole shoes, where a first height of the first base wall with respect to the first one of the plurality of pole shoes in a direction parallel to the axis of rotation is different than a second height of the second base wall with respect to the first one of the plurality of pole shoes in the direction parallel to the axis of rotation, an innermost layer of the first turns being positioned adjacent the first base wall and an innermost layer of the second turns being positioned adjacent the second base wall,
• wherein the predetermined number of turns includes a first layer in the end portion formed by stretches of both the first turns and the second turns, with the stretches being aligned to all have a same third height with respect to the first one of the plurality of pole shoes in the direction parallel to the axis of rotation, wherein the third height is greater than the first height and the second height, the first layer being an outermost layer of the first coil with respect to the first one of the plurality of pole shoes and being positioned to thermally engage the projection;
• wherein the shaped insulator further comprises for the first coil a pair of flat lateral faces respectively positioned on opposite sides of a radial axis of the first one of the plurality of pole shoes, the pair of flat lateral faces extending in respective planes parallel to the axis of rotation and to the radial axis.