Stator for an electric motor

Patent metadata

Field	Value
Publication number	US-12088144-B2
Application number	US-202318346091-A
Country	US
Kind code	B2
Filing date	Jun 30, 2023
Priority date	Jan 7, 2019
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

A stator for an electric motor is described. An example stator includes a stator core having teeth that are radially arranged about a common central axis of the stator and located in a spaced apart manner from one another. Each tooth has an inward portion and an outward portion. The example stator further includes an electrically transmissive coil of wire that is wound contiguously upon the inward portions of at least a subset of teeth from the plurality of teeth. The stator also includes wedge members that are radially arranged about the common central axis and located intermittently with the plurality of teeth such that each wedge member abuts with the outward portions of adjacently located teeth.

First claim

What is claimed is:

1. A stator for an electric motor, the stator comprising:
a stator core having a plurality of teeth radially arranged about a common central axis of the stator core and located in a spaced apart manner from one another, each tooth having an inward portion and an outward portion;
an electrically transmissive coil of wire wound contiguously upon the inward portions of at least a subset of teeth from the plurality of teeth;
a plurality of wedge members radially arranged about the common central axis and located intermittently with the plurality of teeth such that each wedge member abuts with the outward portions of adjacently located teeth; and
a band disposed about radially outward portions of the wedge members, wherein the band is configured to apply a compressive load on the radially outward portions of the wedge members directed radially inward towards the common central axis of the stator core such that the plurality of wedge members frictionally engage with the plurality of teeth for restricting relative movement between the plurality of teeth,
wherein each wedge member defines a recessed portion extending at least partway along a width of the radially outward portion.

2. The stator of claim 1 , wherein the band is configured to apply the compressive load on the on the recessed portion of each wedge directed radially inward.

3. The stator of claim 1 , wherein an end of the inward portion of each tooth defines a pair of ledge members extending laterally from the tooth which define an opening of a first width.

4. The stator of claim 3 , wherein the first width is less than a second width of the electrically transmissive coil of wire.

5. The stator of claim 1 , wherein each tooth is stratified along a height of the stator core and comprises at least two teeth members stacked in a direction parallel to the common central axis.

6. The stator of claim 1 , wherein each wedge member comprises a radially inward portion proximal to the common central axis and the radially outward portion distal from the common central axis.

7. The stator of claim 6 , wherein the width of the radially outward portion is greater than a width of the radially inward portion.

8. The stator of claim 1 , wherein the plurality of teeth and the plurality of wedge members are made from a similar material.

9. The stator of claim 1 , wherein the plurality of teeth and the plurality of wedge members are made from dissimilar materials.

10. An electric motor comprising:
a stator comprising:
a stator core having a plurality of teeth radially arranged about a common central axis of the stator core and located in a spaced apart manner from one another, each tooth having an inward portion and an outward portion;
an electrically transmissive coil of wire wound contiguously upon the inward portions of at least a subset of teeth from the plurality of teeth;
a plurality of wedge members radially arranged about the common central axis and located intermittently with the plurality of teeth such that each wedge member abuts with the outward portions of adjacently located teeth; and
a band disposed about radially outward portions of the wedge members,
wherein the band is configured to apply a compressive load on the radially outward portions of the wedge members directed radially inward towards the common central axis of the stator core such that the plurality of wedge members frictionally engage with the plurality of teeth for restricting relative movement between the plurality of teeth,
wherein each wedge member defines a recessed portion extending at least partway along a width of the radially outward portion.

11. The electric motor of claim 10 , wherein the band is configured to apply the compressive load on the on the recessed portion of each wedge directed radially inward.

12. The electric motor of claim 10 , wherein an end of the inward portion of each tooth defines a pair of ledge members extending laterally from the tooth which define an opening of a first width.

13. The electric motor of claim 12 , wherein the first width is less than a second width of the electrically transmissive coil of wire.

14. The electric motor of claim 10 , wherein each tooth is stratified along a height of the stator core and comprises at least two teeth members stacked in a direction parallel to the common central axis.

15. The electric motor of claim 10 , wherein each wedge member comprises a radially inward portion proximal to the common central axis and the radially outward portion distal from the common central axis.

16. The electric motor of claim 15 , wherein the width of the radially outward portion is greater than a width of the radially inward portion.

17. The electric motor of claim 10 , wherein the plurality of teeth and the plurality of wedge members are made from a similar material.

18. The electric motor of claim 10 , wherein the plurality of teeth and the plurality of wedge members are made from dissimilar materials.

Assignees

• Tesla Inc

Inventors

• Christie Kalonica
• Murphy James
• Olsen Leif
• Nelson David
• Edwards Christopher

Classifications

• H02K1/141

  consisting of C-shaped cores · CPC title

• H02K1/14 Primary

  Stator cores with salient poles · CPC title

• H02K1/146 Primary

  consisting of a generally annular yoke with salient poles · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02K15/022

  with salient poles · CPC title