Annular member, method, and assembly for component displacement control
An electric motor or generator assembly includes a stator, a housing, and an annular member fit between the stator and the housing, where the annular member is radially compressed so as to exert a radial force outward onto the housing and inward onto the stator to maintain a positional relationship therebetween.
1. A electric motor or generator assembly comprising:
a stator;
a housing; and
an annular member fit between the stator and the housing, wherein the annular member is radially compressed so as to exert a radial force outward onto the housing and inward onto the stator to maintain a positional relationship therebetween, wherein the annular member has a torsional stiffness, k tor , and a radial stiffness, k rad , and wherein k tor ≤3 k rad .
2. The electric motor or generator assembly of claim 1 , wherein k tor ≤2 k rad .
3. The electric motor or generator assembly of claim 1 , wherein k tor ≤k rad .
4. The electric motor or generator assembly of claim 1 , wherein the annular member comprises a substrate layer and a damping layer overlying the substrate.
5. The electric motor or generator assembly of claim 4 , wherein the substrate layer comprises a rigid material.
6. The electric motor or generator assembly of claim 4 , wherein the substrate layer comprises a metal.
7. The electric motor or generator assembly of claim 6 , wherein the metal comprises aluminum, iron, copper, titanium, or an alloy thereof.
8. The electric motor or generator assembly of claim 4 , wherein the damping layer comprises foam material.
9. The electric motor or generator assembly of claim 4 , wherein the damping layer comprises an elastomeric material.
10. The electric motor or generator assembly of claim 9 , wherein the annular member comprises a second substrate layer overlying the elastomeric material.
11. The electric motor or generator assembly of claim 4 , wherein the damping layer comprises a polymer comprising a polyketone, a polyaramid, a polyimide, a polyetherimide, a polyamideimide, a polyphenylene sulfide, a polyphenylene sulfone, a polybenzimidazole, a derivation thereof, or a combination thereof.
12. The electric motor or generator assembly of claim 4 , wherein at least one of the substrate or the damping layer comprises an annular band and a plurality of projections around the circumference of the annular band.
13. The electric motor or generator assembly of claim 12 , wherein the projections face radially outward towards the housing.
14. The electric motor or generator assembly of claim 12 , wherein the projections face radially inward towards the stator.
15. The electric motor or generator assembly of claim 12 , wherein the annular band comprises a plurality of apertures.
16. The electric motor or generator assembly of claim 1 , wherein the annular member is fixed to at least one of the stator or the housing.
17. The electric motor or generator assembly of claim 1 , wherein the annular member comprises at least one axial gap extending along the axial length of the annular member.
18. The electric motor or generator assembly of claim 1 , wherein the electric motor or generator assembly comprises an alternator assembly, a drive motor assembly, a oil/water/coolant pump assembly, a steering motor assembly, a hybrid motor assembly, or a compressor assembly.