| 摘要 |
There is described a stator (1) for an electric machine comprising: a stator core (2) having a first and a second face opposite to one another (3, 4) and a circular array of stator slots (5) extending between said faces (3, 4) and that are distributed around a stator axis (Z-Z); and a bar winding (10) comprising a plurality of basic conductors (11) and a plurality of special conductors (12, 13, 14, 15, 16, 17) interconnected to one another for forming the bar winding (10). Each basic conductor (11) comprises two basic conductor legs (11A, 11B) and a basic conductor connecting portion (11C) between said legs (11A, 11B). Each basic conductor leg (11A, 11B) has an end portion connected to the basic conductor connecting portion (11C) and an opposite free end portion (11F). The basic conductors (11) are inserted into the stator slots (5) with the free end portions (11F) protruding from said second face (4). The free end portions (11F) define a plurality of circular conductor layers (LI, L2, L3, L4) concentric to one another comprising a radially outer circular end layer (LI) and a radially inner circular end layer (L4). The special conductors (12, 13, 14, 15, 16, 17) comprise a jumper (12; 13) of a first type having a first and a second jumper arm (12A, 12B; 13A, 13B) respectively connected to two of said free end portions (11F), and a jumper jointing portion (12C; 13C) between said jumper arms (12A, 12B; 13A, 13B). The stator (1) is characterised in that the jumper of said first type (12; 13) is arranged so that: the two' free end portions (11F) whereto the first and the second jumper arm (12A, 12B; 13A, 13B) are connected respectively belong to two of said conductor layers (LI, L2, L3, L4) separate from one another; the jumper jointing portion (12C; 13C) extends radially outer relative to the radially outer end layer (LI), or radially inner relative to the radially inner end layer (L4), for passing around at least one of the free end portions (11F) respectively of the radially outer end layer (LI) or of the radially inner end layer (L4); and at least one between the first and the second jumper arm (12A, 12B; 13A, 13B) extends in a respective passage defined in said conductor layers (LI, L2, L3, L4) for connecting to the respective free end portion (11F). |
