STATOR LAMINATED CORE, STATOR DEVICE, ASSOCIATED PRODUCTION METHOD, ELECTRIC MACHINE FOR AN ELECTRICALLY DRIVABLE VEHICLE, AND ELECTRICALLY DRIVABLE VEHICLE
Stator laminated core having a longitudinal axis, first and second end faces situated axially opposite each other, a first axial portion extending from the first end face towards the second end face, and first to fourth non-overlapping sectors distributed circumferentially in order. The stator laminated core forms a rotor receiving space, which extends along the longitudinal axis from the first to second end face, and forms multiple fastening openings distributed about the longitudinal axis at angular positions between adjacent ones of the first to fourth sectors and extend from the first end face to the second end face. Further, it has a radially outer lateral surface, which has a first outer radius along the first axial portion in the first and the third sector and has a second outer radius, which is greater than the first outer radius, along the first axial portion in the second and the fourth sector.
1 . Stator laminated core having a longitudinal axis, having a first end face, having a second end face situated axially opposite the first end face, having a first axial portion extending from the first end face towards the second end face, and having first to fourth non-overlapping sectors distributed circumferentially in the order of their designation, wherein the stator laminated core
forms a rotor receiving space which extends along the longitudinal axis from the first end face to the second end face,
forms multiple fastening openings, which are distributed about the longitudinal axis at angular positions between two adjacent ones of the first to fourth sectors and extend from the first end face to the second end face, and
has a radially outer lateral surface, which has a first outer radius along the first axial portion in the first and the third sector and has a second outer radius, which is greater than the first outer radius, along the first axial portion in the second and the fourth sector.
2 . Stator laminated core according to claim 1 , having
a second axial portion which extends from the second end face towards the first end face and does not overlap the first axial portion, wherein the radially outer lateral surface along the second axial portion has the second outer radius in the first and the third sector and the first outer radius in the second and the fourth sector.
3 . Stator laminated core according to claim 2 , wherein the axial extent of the first axial portion is at most one quarter, in particular at most one ninth, of the axial extent of the second axial portion.
4 . Stator laminated core according to claim 2 , which
is formed of a multiplicity of individual laminations which are layered along the longitudinal axis and each have a central hole, a number of outer holes corresponding to the number of fastening openings, and an outer periphery, wherein the central holes are arranged congruently in relation to one another such that they form the rotor receiving space, and the outer holes are arranged congruently in relation to one another such that they form the fastening openings, wherein the outer periphery at least partially has the first outer radius and at least partially has the second outer radius, wherein the individual laminations along the first axial portion are arranged such that the outer periphery forms the first outer radius of the outer lateral surface in the first and the third sector and the second outer radius of the outer lateral surface in the second and the fourth sector wherein the individual laminations along the second axial portion are arranged rotated about the longitudinal axis with respect to the individual laminations in the first axial portion such that the outer periphery forms the first outer radius of the outer lateral surface in the second and the fourth sector and the second outer radius of the outer lateral surface in the first and the third sector.
5 . Stator laminated core according to claim 1 , which is arranged mirror-symmetrically with respect to a plane of symmetry which divides the first sector in half and/or with respect to a plane of symmetry which divides one of the even-designated sectors in half.
6 . Stator laminated core according to claim 1 , wherein
the curve of the outer circumference of the outer lateral surface between two respective circumferentially adjacent sectors about a respective angular position at which one of the fastening openings is located is greater than the first outer radius, and the fastening openings are each at least partially outside the first outer radius.
7 . Stator device comprising
a stator laminated core according to claim 2 ;
a stator housing having a longitudinal axis corresponding to the longitudinal axis of the stator laminated core, wherein the stator housing has a radially inner lateral surface which delimits a stator receiving space, and the stator laminated core is accommodated in the stator receiving space in such a way that the inner lateral surface faces towards the outer lateral surface of the stator laminated core, wherein the inner lateral surface has an inner radius, which forms a press fit with the outer lateral surface, in a region in which it faces towards the second and the fourth sector along the first axial portion and has an inner radius, which forms a radial gap in relation to the outer lateral surface, in a region in which it faces towards the first and the third sector in the first axial portion; and
fastening elements, which pass through the fastening openings and brace the stator laminated core against the stator housing.
8 . Stator device according to claim 7 , wherein
the inner lateral surface has an inner radius, which forms a press fit with the outer lateral surface, in a region in which it faces toward the first and the third sector along a sub-portion of the second axial portion that extends from the second end face towards the first end face and has an inner radius which forms a radial gap in relation to the outer lateral surface, in a region in which it faces towards the second and the fourth sector along the sub-portion.
9 . Stator device according to claim 8 , wherein
an axial extent of the sub-portion is at most one quarter, in particular at most one ninth, of the axial extent of the second axial portion.
10 . Stator device according to claim 8 , wherein
the inner lateral surface has an inner radius, which forms a radial gap in relation to the outer lateral surface, in a region in which it faces towards the first to the fourth sector along a second sub-portion which extends from the first sub-portion to the first axial portion.
11 . Stator device according to claim 7 , wherein
the inner radius of the inner lateral surface is constant in its region facing towards the second and the fourth sector.
12 . Stator device according to claim 7 , wherein
the stator housing forms an end shield and the second end face faces towards the end shield.
13 . Method for producing a stator device, comprising the following steps:
providing a stator laminated core according to claim 1 ;
providing a stator housing having a longitudinal axis corresponding to the longitudinal axis of the stator laminated core, wherein the stator housing has a radially inner lateral surface which delimits a stator receiving space;
inserting the stator laminated core into the stator receiving space so that the radially inner lateral surface faces towards the outer lateral surface of the stator laminated core, wherein the inner lateral surface has an inner radius, which upon insertion forms a press fit with the outer lateral surface, in a region in which it faces towards the second and the fourth sector along the first axial portion and has an inner radius, which upon insertion forms a radial gap in relation to the outer lateral surface, in a region in which it faces towards the first and the third sector in the first axial portion; and
bracing the stator laminated core against the stator housing by means of fastening elements which pass through the fastening openings.
14 . Electric machine for an electrically drivable vehicle , comprising a stator device according to claim 7 , and a rotor rotatably mounted inside the rotor receiving space, wherein the electric machine is configured to drive the vehicle.
15 . Electrically drivable vehicle comprising an electric machine according to claim 14 .
16 . Stator laminated core according to claim 3 , which
is formed of a multiplicity of individual laminations, which are layered along the longitudinal axis and each have a central hole, a number of outer holes corresponding to the number of fastening openings, and an outer periphery, wherein the central holes are arranged congruently in relation to one another such that they form the rotor receiving space, and the outer holes are arranged congruently in relation to one another such that they form the fastening openings, wherein the outer periphery at least partially has the first outer radius and at least partially has the second outer radius, wherein the individual laminations along the first axial portion are arranged such that the outer periphery forms the first outer radius of the outer lateral surface in the first and the third sector and the second outer radius of the outer lateral surface in the second and the fourth sector, wherein the individual laminations along the second axial portion are arranged rotated about the longitudinal axis with respect to the individual laminations in the first axial portion such that the outer periphery forms the first outer radius of the outer lateral surface in the second and the fourth sector and the second outer radius of the outer lateral surface in the first and the third sector.
17 . Stator laminated core according to claim 2 , which
is arranged mirror-symmetrically with respect to a plane of symmetry which divides the first sector in half and/or with respect to a plane of symmetry which divides one of the even-designated sectors in half.
18 . Stator laminated core according to claim 2 , wherein
the curve of the outer circumference of the outer lateral surface between two respective circumferentially adjacent sectors about a respective angular position at which one of the fastening openings is located is greater than the first outer radius, and the fastening openings are each at least partially outside the first outer radius.
19 . Stator device comprising
a stator laminated core according to claim 2 ;
a stator housing having a longitudinal axis corresponding to the longitudinal axis of the stator laminated core, wherein the stator housing has a radially inner lateral surface which delimits a stator receiving space, and the stator laminated core is accommodated in the stator receiving space in such a way that the inner lateral surface faces towards the outer lateral surface of the stator laminated core, wherein the inner lateral surface has an inner radius, which forms a press fit with the outer lateral surface, in a region in which it faces towards the second and the fourth sector along the first axial portion and has an inner radius, which forms a radial gap in relation to the outer lateral surface, in a region in which it faces towards the first and the third sector in the first axial portion; and
fastening elements, which pass through the fastening openings and brace the stator laminated core against the stator housing.
20 . Stator device according to claim 9 , wherein
the inner lateral surface has an inner radius, which forms a radial gap in relation to the outer lateral surface, in a region in which it faces towards the first to the fourth sector along a second sub-portion which extends from the first sub-portion to the first axial portion.