ELECTRIC MACHINE HAVING A STATOR WINDING WITH RIGID BARS

摘要

An electric machine provided with: a stator having a magnetic core longitudinally crossed by a plurality of stator slots; a stator winding having a series of rigid bars, which are “U”-shaped and are inserted through the stator slots defining an entry side, in which the cusps of the “U”-shaped bars are placed, and an exit side, in which the legs of the “U”-shaped bars are placed; the ends of at least two non-adjacent legs are electrically connected to one another by means of a connection bridge; and an insulating support is provided, which houses the connection bridge, is arranged under the connection bridge and has a plurality of through holes, into which some legs are inserted, which have to pass through the insulating support itself.

主权项

1. An electric machine (1) having a central axis (3) of rotation and comprising:
a stator (5) comprising a magnetic core (6) longitudinally crossed by a plurality of stator slots (7); and a stator winding (8) having a number of phases and comprising a series of rigid bars (9), which are “U”-shaped and are inserted through the stator slots (7) defining an entry side (12), in which the cusps (11) of the “U”-shaped bars (9) are placed, and an exit side (13), in which the legs (10) of the “U”-shaped bars (9) are placed; wherein the legs (10) of the “U”-shaped bars (9) coming out from the exit side (13) of the magnetic core (6) are twisted through relative double folds, each of which comprises an internal fold (15) in one direction and an external fold (16) in the opposite direction; wherein the ends of the legs (10) of the “U”-shaped bars (9) are electrically connected to one another so as to form the electrical paths of the stator winding (8); wherein the ends of at least two non-adjacent legs (10) are electrically connected to one another by means of a connection bridge (18; 28; 30; 32; 34), which is made of a flat plate arranged perpendicular to the central axis (3) of rotation and has, for each leg (10), a corresponding “U”-shaped seat (19), which is suited to receive the end of the leg (10); and wherein an insulating support (20; 29; 31; 33; 35) is provided, which is made of an electrically insulating plastic material, houses the connection bridge (18; 28; 30; 32; 34), is arranged under the connection bridge (18; 28; 30; 32; 34) and has a plurality of through holes (22), into which some legs are inserted (10), which have to pass through the insulating support (20; 29; 31; 33; 35) itself; the electric machine (1) is characterised in that the insulating support (20; 29; 31; 33; 35) comprises at least one seat (25), which is suited to receive and mechanically lock the connection bridge (18; 28; 30; 32; 34) in the correct position.