STATOR FOR AN ELECTRIC MACHINE, ELECTRIC MACHINE, ELECTRIC DRIVE FOR A VEHICLE AND VEHICLE
A stator for an electric machine includes a stator core having a longitudinal axis, an axial first face side and an axial second face side opposite to the first face side, the stator core providing an accommodation space for a rotor of the electric machine. Multiple hairpin conductors having first type leg portions and second type leg portions, the hairpin conductors being connected to each other so as to form a stator winding.
1 . Stator for an electric machine, comprising:
a stator core comprising a longitudinal axis, an axial first face side and an axial second face side opposite to the first face side, the stator core providing an accommodation space for a rotor of the electric machine;
multiple hairpin conductors having first type leg portions and second type leg portions, the hairpin conductors being connected to each other so as to form a stator winding; and
a slot formed within the stator core and radially divided into an inner layer located closest to the accommodation space and into further layers being more distant to the accommodation space than the inner layer;
wherein
two first type leg portions extend within the inner layer,
one second type leg portion extends within each of the further layers and
in a cross-section perpendicular to the longitudinal axis, the radial extent of each of the first type leg portions is smaller than the radial extent of each of the second type leg portions;
wherein
the first type leg portions are electrically short-circuited at the first face side.
2 . Stator according to claim 1 , wherein
the first type leg portions are short-circuited by means of a welding connection of connections portion of the hairpin conductors, each connection portion extending out of the stator core at the first face side.
3 . Stator according to claim 1 , wherein the first type leg portions are formed by first type hairpin conductors each having the first type leg portion and a connection portion at the second face side, the connection portion being connected in an electrically conductive and mechanical manner with the connection portion of another one of the first type hairpin conductors outside the stator core.
4 . Stator according to claim 1 , wherein
pairs of second type leg portions are formed by second type hairpin conductors each having the pair of second type leg portions and a bending portion at the second face side, each second type hairpin conductor being formed by a single bent metal rod.
5 . Stator according to claim 4 , wherein
each second type leg portion of each second type hairpin conductor is connected in an electrically conductive and mechanical manner with another second type leg portion on the first face side outside the stator core.
6 . Stator according to claim 1 , wherein
at least one further first type leg portion extends within the inner layer.
7 . Stator according to claim 1 , wherein the slot is further divided into a second inner layer located between the first inner layer and the further layers, wherein at least two first type leg portions extend within the second inner layer.
8 . Stator according to claims 6 , wherein
the number of first type leg portions extending within a respective one of the inner layers decreases in radial direction away from the accommodation space.
9 . Stator according to claim 1 , wherein
the leg portions are electrically isolated against each other within the slot.
10 . Stator according to claim 1 , wherein
the accommodation space is provided radially inside of the stator core.
11 . Electric machine, comprising a rotor and a stator according to claim 1 , the rotor being mounted rotatably with respect to the stator.
12 . Electric drive for a vehicle, comprising an electric machine according to claim 11 , a power converter configured to supply a multi-phase voltage to the stator winding and a housing, which accommodates the electric machine and the power converter.
13 . Vehicle, comprising
an electric drive according to claim 12 ;
wherein the electric machine is configured to drive the vehicle.
14 . Stator according to claim 2 , wherein
the first type leg portions are formed by first type hairpin conductors each having the first type leg portion and a connection portion at the second face side, the connection portion being connected in an electrically conductive and mechanical manner with the connection portion of another one of the first type hairpin conductors outside the stator core.
15 . Stator according to claim 2 , wherein
pairs of second type leg portions are formed by second type hairpin conductors each having the pair of second type leg portions and a bending portion at the second face side, each second type hairpin conductor being formed by a single bent metal rod.
16 . Stator according to claim 2 , wherein
at least one further first type leg portion extends within the inner layer.
17 . Stator according to claim 2 , wherein
the slot is further divided into a second inner layer located between the first inner layer and the further layers, wherein at least two first type leg portions extend within the second inner layer.
18 . Stator according to claim 7 , wherein
the number of first type leg portions extending within a respective one of the inner layers decreases in radial direction away from the accommodation space.
19 . Stator according to claim 2 , wherein
the leg portions are electrically isolated against each other within the slot.
20 . Stator according to claim 2 , wherein
the accommodation space is provided radially inside of the stator core.