Electric machine having vibration attenuating stator laminations

Patent metadata

Field	Value
Publication number	US-11677283-B2
Application number	US-202016984897-A
Country	US
Kind code	B2
Filing date	Aug 4, 2020
Priority date	Aug 4, 2020
Publication date	Jun 13, 2023
Grant date	Jun 13, 2023

Abstract

An electric machine includes a stator formed from a plurality of stacked laminations and defining a center bore and a rotor disposed within the center bore. The rotor is configured to output a rotational torque in response to an input current delivered to the stator. At least one of the stacked laminations of the stator includes a pattern of perforations disposed at a yoke portion of the stator to attenuate structure-bore transmission of vibration during operation of the electric machine.

First claim

What is claimed is:

1. An electric machine comprising:
a stator formed from a plurality of stacked laminations and defining a center bore; and
a rotor disposed within the center bore and configured to output a rotational torque in response to an input current delivered to the stator, wherein at least one of the stacked laminations of the stator includes a pattern of perforations disposed at a yoke portion of the stator to attenuate structure-bore transmission of vibration during operation of the electric machine, wherein the pattern of perforations comprises multiple groups of perforations arranged circumferentially about the rotor and wherein each of the groups of perforations outline a discrete rectangle, triangle, circle, or ellipse spaced away from other of the groups.

2. The electric machine of claim 1 , wherein the pattern of perforations of a first lamination of the stacked laminations is misaligned with respect to adjacent laminations of the stacked laminations.

3. The electric machine of claim 2 , wherein the first lamination is rotationally indexed with respect to adjacent laminations of the plurality of stacked laminations.

4. The electric machine of claim 2 wherein the first lamination defines a first pattern of perforations that is different from a second pattern of perforations defined by adjacent laminations of the stacked laminations.

5. The electric machine of claim 1 , wherein individual holes of the pattern of perforations are configured as at least one of a circular hole, a rectangular hole, a triangular hole, and an oblong hole.

6. The electric machine of claim 1 , wherein the pattern of perforations defines a first row of perforation shapes located radially outward of a second row of perforation shapes.

7. The electric machine of claim 6 , wherein the first row of perforation shapes is rotationally indexed relative to the second row of shapes such that the perforation shapes of each individual row are angularly misaligned relative to an axis of rotation of rotation of the electric machine.

8. An electric machine comprising:
a stator formed from a stack of laminations, each of the laminations defining a pattern of perforations that comprises multiple groups of perforations arranged circumferentially about the lamination and wherein each of the groups of perforations outlines a discrete rectangle, triangle, circle, or ellipse spaced away from other of the groups; and
a rotor disposed within a center bore of the stator and configured to output a rotational torque in response to an input current delivered to the stator.

9. The electric machine of claim 8 , wherein the pattern of a first lamination of the stack of laminations is misaligned with respect to adjacent laminations of the stack of laminations.

10. The electric machine of claim 8 , wherein a first lamination is rotationally indexed with respect to adjacent laminations of the stack of laminations.

11. The electric machine of claim 8 , wherein individual holes of the pattern of perforations are configured as at least one of a circular hole, a rectangular hole, a triangular hole, an oblong hole.

12. An electric machine comprising:
a stator defining a center bore and configured to receive a current input, the stator including
a first lamination defining a first pattern of perforations, and
a second lamination adjacent the first lamination and defining a second pattern of perforations; and

a rotor disposed within the center bore and configured to output a rotational torque in response to an input current delivered to the stator, wherein the first pattern of perforations is misaligned relative to the second pattern of perforations to attenuate structure-bore transmission of vibration during operation of the electric machine and wherein the first pattern of perforations comprises multiple groups of perforations arranged circumferentially about the rotor and wherein each of the groups of perforations outlines a discrete rectangle, triangle, circle, or ellipse spaced away from other of the groups.

13. The electric machine of claim 12 , wherein individual holes of each of the first pattern and second pattern of perforations are configured as at least one of a circular hole, a rectangular hole, a triangular hole, an oblong hole.

14. The electric machine of claim 12 , wherein first lamination is rotationally indexed with respect to the second lamination.

15. The electric machine of claim 12 , wherein at least one of the first pattern and second pattern of perforations defines a first row of perforation shapes located radially outward of a second row of perforation shapes.

16. The electric machine of claim 15 , the first row of perforation shapes is rotationally indexed relative to the second row of shapes such that the perforation shapes of each individual row are angularly misaligned relative to an axis of rotation of the electric machine.

Assignees

• Ford Global Tech Llc

Inventors

• Wolf Christopher
• Leonardi Franco
• Degner Michael W

Classifications

• H02K5/24

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

• H02K1/165

  Shape, form or location of the slots · CPC title

• H02K1/185 Primary

  to outer stators · CPC title

• H02K1/08 Primary

  Salient poles · CPC title

• H02K1/22 Primary

  Rotating parts of the magnetic circuit · CPC title