Optimized stator tooth for electric motor/generator
An electric motor/generator includes a stator-core enclosing a rotor-core, which are each formed from stacked annular laminates. The stator-core laminates are configured to reduce vibration, and each have teeth extending radially inward from a root of an annular stator yoke/back-iron, to a flux-cap. Each tooth is formed to have opposite, lateral-edges spaced a distance-apart that changes between the root to the flux-cap, to establish a variable tooth-stiffness and a predetermined mechanical-resonance of the tooth. The opposite lateral-edges may each be configured with either a linear or a non-linear, curved edge-profile, and to have the variable tooth-stiffness and the lateral-edge distance-apart changing or decreasing between the root and the flux-cap. Each tooth may also have an edge-profile that is different from at least one adjacent tooth, and which is configured with a variable tooth-stiffness and a predetermined mechanical resonance that is different from the at least one adjacent tooth.
1. An electric motor/generator, comprising:
an annular stator yoke lamination;
a plurality of teeth extending radially inward from a root of the annular stator yoke lamination to a flux-cap, the teeth defining interstitial slots therebetween; and
each tooth having opposite, lateral-edges spaced a distance-apart that changes between the root and the flux-cap, to establish a variable tooth-stiffness and a predetermined mechanical-resonance of the tooth.
2. The electric motor/generator of claim 1 , further comprising:
the opposite lateral-edges being symmetrical about a radial pitch-axis.
3. The electric motor/generator of claim 1 , further comprising:
the opposite lateral-edges being asymmetrical about a radial pitch-axis.
4. The electric motor/generator of claim 1 , further comprising:
the opposite lateral-edges each configured with a non-linear, curved edge-profile, and having the variable tooth-stiffness and the distance-apart decreasing between the root and the flux-cap.
5. The electric motor/generator of claim 1 , further comprising:
the opposite lateral-edges being non-parallel and each configured with a linear edge-profile having the variable tooth-stiffness and the distance-apart decreasing between the root and the flux-cap.
6. The electric motor/generator of claim 1 , further comprising:
each tooth having an edge-profile different from at least one adjacent tooth, and configured with a variable tooth-stiffness and a predetermined mechanical resonance that is different from the at least one adjacent tooth; and
the respective edge-profiles establishing a plurality of variable tooth-stiffnesses and a plurality of predetermined mechanical resonances.
7. The electric motor/generator of claim 1 , further comprising:
each tooth in the plurality having respective edge-profiles that alternate from tooth to tooth between two or more different edge-profiles.
8. The electric motor/generator of claim 1 , further comprising:
the plurality of teeth including two or more sub-groups of teeth, wherein each sub-group is configured such that each tooth in the sub-group has respective edge-profiles that alternate, from one sub-group to the next, between two or more different edge-profiles.
9. An electric motor/generator, comprising:
a rotor-core received within an annular stator-core;
a plurality of stacked stator laminates forming the annular stator-core, each laminate including a plurality of teeth extending radially inward from a back-iron to an air-gap surface of a flux-cap and defining interstitial slots therebetween; and
each tooth having opposite lateral-edges a distance-apart that varies from the back-iron to the flux-cap and which establishes a variable tooth-stiffness and a predetermined mechanical-resonance of the tooth.
10. The electric motor/generator of claim 9 , further comprising:
the opposite lateral-edges being symmetrical about a radial pitch-axis.
11. The electric motor/generator of claim 9 , further comprising:
the opposite lateral-edges being asymmetrical about a radial pitch-axis.
12. The electric motor/generator of claim 9 , further comprising:
the opposite lateral-edges each configured with a non-linear, curved edge-profile having the variable tooth-stiffness and the distance-apart decreasing between the back-iron and the flux-cap.
13. The electric motor/generator of claim 9 , further comprising:
the opposite lateral-edges each configured with a linear edge-profile having the variable tooth-stiffness and the distance-apart decreasing between the back-iron and the flux-cap.
14. The electric motor/generator of claim 9 , further comprising:
each tooth having an edge-profile different from at least one adjacent tooth, and configured with a variable tooth-stiffness and a predetermined mechanical resonance that is different from the at least one adjacent tooth; and
the respective edge-profiles establishing a plurality of variable tooth-stiffnesses and a plurality of predetermined mechanical resonances.
15. The electric motor/generator of claim 9 , further comprising:
each tooth in the plurality having respective edge-profiles that alternate from tooth to tooth between two or more different edge-profiles.
16. The electric motor/generator of claim 9 , further comprising:
the plurality of teeth including two or more sub-groups of teeth, wherein each sub-group is configured such that each tooth in the sub-group has respective edge-profiles that alternate, from one sub-group to the next, between two or more different edge-profiles.