Stator assembly and magnetic bearing or electric motor having such a stator assembly
A stator assembly that provides a concentric housing and stator, the stator radially positioned inside the housing, the housing having an inner surface, the stator having an outer surface radially facing the inner surface. One of the outer surface of the stator and the inner surface of the housing has recessed shapes and the other one of the outer and inner surface has protruding shapes. When the two shapes are arranged in a first relative position, the protruding shapes are inserted in the recessed shapes so that the stator can be mounted radially inside the housing along a central axis of the assembly, and in a second relative position that is angularly shifted relative to the first position around the central axis, the protruding shapes exert, against the one of the housing and the stator that bears the recessed shapes, a radial force that angularly and axially locks the stator.
1. A stator assembly comprising:
a housing and a stator that are concentric, the stator mounted radially inside the housing, the housing having an inner surface and the stator having an outer surface that radially faces the inner surface of the housing, wherein one of the outer surface of the stator and the inner surface of the housing has recessed shapes and the other one of the outer surface of the stator and the inner surface of the housing has protruding shapes, and wherein the recessed shapes and the protruding shapes are arranged so that:
in a first relative position of the housing and the stator, the protruding shapes are inserted in the recessed shapes so that the stator can be mounted radially inside the housing along a central axis of the assembly, and
in a second relative position of the housing and the stator, which is angularly shifted relative to the first position around the central axis, the protruding shapes exert, against the one of the housing and the stator that bears the recessed shapes, a radial force which angularly and axially locks the stator with respect to the housing,
wherein the recessed shapes are provided on the inner surface of the housing while the protruding shapes are provided on the outer surface of the stator,
wherein the protruding shapes of the outer surface of the stator are formed by rollers rotatable with respect to the stator around axes parallel to the central axis of the assembly.
2. The stator assembly according to claim 1 , wherein the minimal diameter of the inner surface of the housing is less than the maximal diameter of the outer surface of the stator.
3. The stator assembly according to claim 1 , further comprising four protruding shapes adapted to be inserted into four recessed shapes.
4. The stator assembly according to claim 1 , wherein the recessed shapes of the inner surface of the housing are formed by recesses having a semi-cylindrical shape.
5. The stator assembly according to claim 1 , wherein the inner surface of the housing has an octagonal shape in transversal section, and wherein the recessed shapes of the inner surface of the housing are formed by angles of the octagonal shape.
6. The stator assembly according to claim 1 , wherein the stator is made or four separate parts, and wherein the rollers are mounted in cylindrical holes provided at the interfaces of the four separate parts of the stator.
7. The stator assembly according to claim 1 , wherein the recessed shapes are provided on the outer surface of the stator while the protruding shapes are provided on the inner surface of the housing.
8. The stator assembly according to claim 7 , wherein the protruding shapes of the inner surface of the housing are formed by bosses.
9. The stator assembly according to claim 7 , wherein the recessed shapes of the outer surface of the stator are formed by recesses having a cylindrical shape.
10. The stator assembly according to claim 7 , wherein the recessed shapes of the outer surface ( 50 ) are provided on both sides of rollers disposed on the stator and rotatable with respect to the stator around axes parallel to the central axis of the assembly, and wherein in the second relative position of the stator and the housing, the protruding shapes of the inner surface of the housing exert the radial force against the rollers.
11. The stator assembly according to claim 10 , wherein the stator is made or four separate parts, and wherein the rollers are mounted in cylindrical holes provided at the interfaces of the four separate parts of the stator.
12. A magnetic bearing including a stator, the stator comprising:
a stator assembly having a housing and a stator that are concentric, the stator mounted radially inside the housing, the housing having an inner surface and the stator having an outer surface that radially faces the inner surface of the housing, wherein one of the outer surface of the stator and the inner surface of the housing has recessed shapes and the other one of the outer surface of the stator and the inner surface of the housing has protruding shapes, and wherein the recessed shapes and the protruding shapes are arranged so that:
in a first relative position of the housing and the stator, the protruding shapes are inserted in the recessed shapes so that the stator can be mounted radially inside the housing along a central axis of the assembly, and
in a second relative position of the housing and the stator, which is angularly shifted relative to the first position around the central axis, the protruding shapes exert, against the one of the housing and the stator that bears the recessed shapes, a radial force which angularly and axially locks the stator with respect to the housing,
wherein the recessed shapes are provided on the inner surface of the housing while the protruding shapes are provided on the outer surface of the stator,
wherein the protruding shapes of the outer surface of the stator are formed by rollers rotatable with respect to the stator around axes parallel to the central axis of the assembly.
13. An electric motor including a stator, the stator comprising:
a stator assembly having a housing and a stator that are concentric, the stator mounted radially inside the housing, the housing having an inner surface and the stator having an outer surface that radially faces the inner surface of the housing, wherein one of the outer surface of the stator and the inner surface of the housing has recessed shapes and the other one of the outer surface of the stator and the inner surface of the housing has protruding shapes, and wherein the recessed shapes and the protruding shapes are arranged so that:
in a first relative position of the housing and the stator, the protruding shapes are inserted in the recessed shapes so that the stator can be mounted radially inside the housing along a central axis of the assembly, and
in a second relative position of the housing and the stator, which is angularly shifted relative to the first position around the central axis, the protruding shapes exert, against the one of the housing and the stator that bears the recessed shapes, a radial force which angularly and axially locks the stator with respect to the housing,
wherein the recessed shapes are provided on the inner surface of the housing while the protruding shapes are provided on the outer surface of the stator,
wherein the protruding shapes of the outer surface of the stator are formed by rollers rotatable with respect to the stator around axes parallel to the central axis of the assembly.