Axial flux electric machine and methods of assembling the same

Patent metadata

Field	Value
Publication number	US-11018565-B2
Application number	US-201815980193-A
Country	US
Kind code	B2
Filing date	May 15, 2018
Priority date	May 15, 2018
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

A stator assembly for use in an axial flux electric motor includes at least one tooth tip and at least one stator tooth coupled to the at least one tooth tip, wherein the at least one stator tooth includes an insertable portion. The stator assembly also includes at least one stator base including at least one receiving slot configured to receive the insertable portion to form a mechanical joint between the at least one stator base and the at least one stator tooth.

First claim

What is claimed is:

1. A stator assembly for use in an axial flux electric motor, said stator assembly comprising:
at least one tooth tip;
at least one stator tooth coupled to said at least one tooth tip, wherein said at least one stator tooth comprises an insertable portion;
at least one stator base comprising:
at least one receiving slot configured to receive said insertable portion to form a mechanical joint between said at least one stator base and said at least one stator tooth,
a base mounting mechanism;
at least one relief slot formed proximate said at least one receiving slot; and
at least one post defined between said relief slot and said receiving slot, wherein said at least one post comprises a first side and an opposing second side obliquely oriented with respect to said first side;
an extension portion extending from said at least one stator base, said extension portion comprising said at least one receiving slot; and

a motor frame comprising at least one frame mounting mechanism configured to couple to said base mounting mechanism to couple said at least one stator base to said motor frame.

2. The stator assembly in accordance with claim 1 , wherein said insertable portion comprises a first taper angle and wherein said at least one receiving slot comprises a second taper angle greater than the first taper angle to form an interference fit.

3. The stator assembly in accordance with claim 1 , wherein said at least one tooth tip and said at least one stator tooth are integrally formed as a unitary component.

4. The stator assembly in accordance with claim 1 , further comprising a bobbin coupled to said at least one stator base, wherein said extension portion extends into an opening defined in said bobbin, and wherein said at least one stator tooth is configured for insertion into said opening such that said mechanical joint is positioned within said opening.

5. The stator assembly in accordance with claim 1 , wherein said at least one stator base comprises a ring-shaped stator base comprising a plurality of said receiving slots.

6. The stator assembly in accordance with claim 1 , wherein said at least one stator base comprises a plurality of circumferentially-spaced stator bases.

7. An axial flux electric motor comprising:
a rotor assembly; and
a stator assembly coupled to said rotor assembly to define an axial gap therebetween, wherein said stator assembly comprises:
at least one tooth assembly comprising a tip portion and a tooth portion integrally formed with said tip portion, wherein said tooth portion comprises an insertable portion; and
a plurality of stator bases, wherein each stator base comprises:
at least one receiving slot configured to receive said insertable portion to form a mechanical joint between said at least one stator base and said at least one tooth assembly,
a base mounting mechanism; and
at least one relief slot formed proximate said at least one receiving slot; and
at least one post defined between said relief slot and said receiving slot, wherein said at least one post comprises a first side and an opposing second side obliquely oriented with respect to said first side; and

a motor frame comprising at least one frame mounting mechanism configured to couple to said base mounting mechanism to couple said at least one stator base to said motor frame, wherein said plurality of stator bases are circumferentially-spaced about said motor frame.

8. The axial flux electric motor in accordance with claim 7 , wherein said at least one stator base comprises an extension portion extending from said at least one stator base, said extension portion comprising said at least one receiving slot.

9. The axial flux electric motor in accordance with claim 8 , further comprising a bobbin coupled to said at least one stator base, wherein said extension portion extends into an opening defined in said bobbin, and wherein said tooth portion is configured for insertion into said opening such that said mechanical joint is positioned within said opening.

10. The axial flux electric motor in accordance with claim 7 , wherein said at least one tooth assembly comprises a plurality of stacked laminated sheets.

11. The axial flux electric motor in accordance with claim 7 , wherein said at least one stator base comprises a ring-shaped stator base comprising a plurality of said receiving slots.

12. A method of assembling an axial flux electric motor, said method comprising:
coupling at least one stator base to a motor frame, wherein the at least one stator base includes:
at least one receiving slot,
a base mounting mechanism, wherein coupling the at least one stator base comprises coupling the base mounting mechanism to a frame mounting mechanism of the motor frame,
at least one relief slot formed proximate the at least one receiving slot; and
at least one post defined between the at least one relief slot and the receiving slot, wherein the at least one post includes a first side and an opposing second side obliquely oriented with respect to the first side; and

coupling a tooth tip to a stator tooth, wherein the stator tooth includes an insertable portion;
coupling at least one bobbin to the at least one stator base; and
inserting the insertable portion of the stator tooth through an opening in the at least one bobbin and into the at least one receiving slot of the stator base to form a mechanical joint, wherein the post is configured to deform upon insertion of the insertable portion.

13. The method of claim 12 , wherein coupling the tooth tip to the stator tooth comprises integrally forming the tooth tip and the stator tooth as a unitary component.

14. The method of claim 12 , wherein inserting the insertable portion comprises inserting the insertable portion into the at least one receiving slot formed in an extension portion of the at least one stator base such that the mechanical joint is positioned within the opening of the at least one bobbin.

15. The method of claim 14 , wherein coupling the at least one stator base to the motor frame comprises coupling a ring-shaped stator base to the motor frame.

16. An axial flux electric motor comprising:
a rotor assembly; and
a stator assembly coupled to said rotor assembly to define an axial gap therebetween, wherein said stator assembly comprises:
at least one tooth assembly comprising a tip portion and a tooth portion integrally formed with said tip portion, wherein said tooth portion comprises an insertable portion, wherein said at least one tooth assembly comprises a plurality of stacked laminated sheets; and
at least one stator base comprising:
at least one receiving slot configured to receive said insertable portion to form a mechanical joint between said at least one stator base and said at least one tooth assembly,
a base mounting mechanism; and
at least one relief slot formed proximate said at least one receiving slot; and
at least one post defined between said relief slot and said receiving slot, wherein said at least one post comprises a first side and an opposing second side obliquely oriented with respect to said first side; and

a motor frame comprising at least one frame mounting mechanism configured to couple to said base mounting mechanism to couple said at least one stator base to said motor frame.

Assignees

• Regal Beloit America Inc
• Regal Beloit Australia Pty Ltd

Inventors

• Post Steve Wilfred
• Heins Greg
• Kreidler Jason Jon

Classifications

• H02K1/2795

  the rotor consisting of two or more circumferentially positioned magnets · CPC title

• H02K7/14

  Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) · CPC title

• H02K11/33

  Drive circuits, e.g. power electronics (H02K11/38 takes precedence) · CPC title

• H02K5/24

  specially adapted for suppression or reduction of noise or vibrations · CPC title

• F04D29/4226

  Fan casings · CPC title