Choke device for an electric machine system

Patent metadata

Field	Value
Publication number	US-12395045-B2
Application number	US-202318164572-A
Country	US
Kind code	B2
Filing date	Feb 4, 2023
Priority date	Feb 4, 2023
Publication date	Aug 19, 2025
Grant date	Aug 19, 2025

Abstract

A choke device for an electric machine system is provided. The choke device includes a common-mode choke including a magnetic core configured in cross-section as a geometric shape including a hollow center. The choke device further includes a plurality of electric transmission lines configured for transmitting electrical energy in alternating current, wherein the plurality of electric transmission lines is routed through the hollow center. The geometric shape includes a number of sides based upon a number of the electric transmission lines present and is configured for minimizing or reducing an overall flux length of the magnetic core.

First claim

What is claimed is:

1. A choke device for an electric machine system, the choke device comprising:
a common-mode choke including a magnetic core configured in cross-section as a geometric shape including a hollow center; and
a plurality of electric transmission lines configured for transmitting electrical energy in alternating current, wherein the plurality of electric transmission lines is routed through the hollow center; and
wherein the geometric shape includes a number of sides based upon a number of the electric transmission lines present and is configured for minimizing or reducing an overall flux length of the magnetic core.

2. The choke device of claim 1 , wherein the plurality of electric transmission lines is symmetrically arranged and configured for equally coupled fields, a same proximity effect among the plurality of electric transmission lines, a minimized zero sequency current, and a voltage which reduces a common-mode current.

3. The choke device of claim 2 , wherein the plurality of electric transmission lines include symmetric shielding, are equally distant from each other, and are equally distant from the common-mode choke; and
wherein the plurality of electric transmission lines is further configured for coherently adding magnetic fields or flux through the common-mode choke and for strengthening the choke in balance, increasing a total inductance, and providing impedance to the common-mode current.

4. The choke device of claim 1 , further comprising dielectric material configured for increasing a permeability of the choke device to increase inductance.

5. The choke device of claim 1 , further comprising thermally conductive material configured for removing heat from the choke device.

6. The choke device of claim 1 , wherein the plurality of the electric transmission lines includes bus bars.

7. The choke device of claim 6 , wherein the bus bars outside of the choke device bend inwardly to route through the common-mode choke and are configured for reducing flux length to increase inductance.

8. The choke device of claim 6 , wherein the bus bars are relatively thicker outside of the choke device and are relatively thinner inside of the choke device.

9. The choke device of claim 6 , wherein the bus bars are relatively wider outside of the choke device and are relatively narrower inside of the choke device.

10. The choke device of claim 1 , wherein the plurality of the electric transmission lines is arranged within the choke device such that a centerline of each of the plurality of electric transmission lines is equidistant from a geometric center of the choke device.

11. The choke device of claim 1 , wherein the geometric shape has a same number of the sides as the number of the plurality of the electric transmission lines present.

12. The choke device of claim 1 , further comprising a ground conductor routed through the common-mode choke; and
the geometric shape has a same number of the sides as the number of the plurality of the electric transmission lines present plus one.

13. The choke device of claim 1 , wherein one of the plurality of electric transmission lines is coincident with a geometric center of the choke device;
wherein a remainder of the plurality of electric transmission lines is equally spaced around the one of the plurality of electric transmission lines; and
wherein the geometric shape has a same number of the sides as the number of the plurality of the electric transmission lines present minus one.

14. The choke device of claim 1 , further comprising a ground conductor coincident with a geometric center of the choke device;
wherein a remainder of the plurality of electric transmission lines is equally spaced around the one of the plurality of electric transmission lines; and
wherein the geometric shape has a same number of the sides as the number of the plurality of the electric transmission lines present.

15. The choke device of claim 1 , wherein each of the plurality of electric transmission lines includes:
shielding; and
insulation disposed between the electric transmission line and the shielding.

16. The choke device of claim 1 , wherein the common-mode choke includes a vertical lamination including a plurality of stacked ferrite sheets or a horizontal lamination including a spirally wound ferrite sheet or a spirally wound ferrite ribbon.

17. The choke device of claim 1 , wherein the geometric shape includes a triangle, a square, a pentagon, a hexagon, a septagon, an octagon, a nonagon, or a decagon.

18. The choke device of claim 1 , wherein a gap in the magnetic core is maintained, wherein the gap is configured for reducing saturation.

19. A system including a choke device for an electric machine, the system comprising:
a battery configured for receiving and providing electrical energy in direct current;
an electric machine configured for receiving and providing electrical energy in a plurality of phases in alternating current;
a power inverter transforming electrical energy between direct current and alternating current; and
the choke device located between the electric machine and the power inverter, the choke device including:
a common-mode choke including a magnetic core configured in cross-section as a geometric shape including a hollow center; and
a plurality of electric transmission lines configured for transmitting electrical energy in alternating current, wherein the plurality of electric transmission lines is routed through the hollow center; and

wherein the geometric shape includes a number of sides based upon a number of the electric transmission lines present and is configured for minimizing or reducing an overall flux length of the magnetic core.

20. A device including a system including a choke device for an electric machine, the device comprising:
the system, including:
a battery configured for receiving and providing electrical energy in direct current;
an electric machine configured for receiving and providing electrical energy in a plurality of phases in alternating current;
a power inverter transforming electrical energy between direct current and alternating current; and
the choke device located between the electric machine and the power inverter, the choke device including:
a common-mode choke including a magnetic core configured in cross-section as a geometric shape including a hollow center; and
a plurality of electric transmission lines configured for transmitting electrical energy in alternating current, wherein the plurality of electric transmission lines is routed through the hollow center; and

wherein the geometric shape includes a number of sides based upon a number of the electric transmission lines present and is configured for minimizing or reducing an overall flux length of the magnetic core.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Luo Yilun
• Namuduri Chandra S
• Gopalakrishnan Suresh
• Alvi Muhammad H
• Narimissa Azadeh
• Ivan William T
• Karuppuswami Saranraj

Classifications

• H02K11/30

  Structural association with control circuits or drive circuits · CPC title

• H02K11/01 Primary

  for shielding from electromagnetic fields {, i.e. structural association with shields} (means for preventing or reducing eddy-current losses in the winding heads by shielding H02K3/42) · CPC title

• H02K11/02 Primary

  for suppression of electromagnetic interference · CPC title

• H01R25/145

  Details, e.g. end pieces or joints (H01R25/147 takes precedence) · CPC title

• H01F27/321

  using a fluid for insulating purposes only · CPC title