Interior permanent magnet machine

Patent metadata

Field	Value
Publication number	US-9118230-B2
Application number	US-201313761888-A
Country	US
Kind code	B2
Filing date	Feb 7, 2013
Priority date	Feb 7, 2013
Publication date	Aug 25, 2015
Grant date	Aug 25, 2015

Abstract

An interior permanent magnet machine includes a stator including a plurality of electrical conductors. The interior permanent magnet machine further includes a rotor concentrically disposed in relation to the stator. The rotor is configured to rotate relative to the stator about a rotational axis and includes a plurality of polar pieces arranged annularly about the rotational axis. At least one of the polar pieces includes a magnetic layer configured to magnetically interact with the electrical conductors. The magnetic layer has a substantially conic section shape.

First claim

The invention claimed is:

1. An interior permanent magnet machine comprising:
a stator including a plurality of electrical conductors; and
a rotor concentrically disposed in relation to the stator, the rotor configured to rotate relative to the stator about a rotational axis and including a plurality of polar pieces arranged annularly about the rotational axis, wherein each of the polar pieces includes a first magnetic layer, a second magnetic layer, and a third magnetic layer, each of the first, second, and third magnetic layers is configured to magnetically interact with the electrical conductors, the first magnetic layer has a parabolic shape, the second magnetic layer has semi elliptical shape, the third magnetic layer has a hyperbolic shape, and the second magnetic layer is disposed between the first magnetic layer and the third magnetic layer.

2. The interior permanent magnet machine of claim 1 , wherein the first magnetic layer includes a first permanent magnet and a second permanent magnet, and the first and second permanent magnets collectively defining the parabolic shape.

3. The interior permanent magnet machine of claim 2 , wherein the first and second permanent magnets are bonded magnets.

4. The interior permanent magnet machine of claim 2 , wherein the rotor further includes an intra-polar bridge separating the first permanent magnet from the second permanent magnets.

5. The interior permanent magnet machine of claim 4 , wherein an air gap is defined between the rotator and the stator, and a focal point of the parabolic shape is located in the air gap.

6. The interior permanent magnet machine of claim 5 , wherein the intra-polar bridge is elongated along a center pole axis that intersects the rotational axis and the focal point.

7. The interior permanent magnet machine of claim 1 , wherein the second magnetic layer includes a first permanent magnet and a second permanent magnet collectively defining the semi-elliptical shape.

8. The interior permanent magnet machine of claim 1 , wherein the third magnetic layer includes a first permanent magnet and a second permanent magnet collectively defining the hyperbolic shape.

9. A vehicle comprising:
a driveline; and
an interior permanent magnet machine operatively connected to the driveline, the interior permanent magnet machine including:
a stator including a plurality of electrical conductors; and
a rotator at least partly disposed within the stator and configured to rotate relative to the stator, wherein the rotator includes a first magnetic layer, a second magnetic layer, and a third magnetic layer, each of the first, second, and third magnetic layers has a conic section shape that has a focal point located between the stator and the rotator, the first magnetic layer has a parabolic shape, the second magnetic layer has a semi-elliptical shape, the third magnetic layer has a hyperbolic shape, and the second magnetic layer is disposed between the first magnetic layer and the third magnetic layer.

10. The vehicle of claim 9 , wherein the first, second, and third magnetic layers include bonded magnets.

11. The vehicle of claim 9 , wherein each of the first, second, and third magnetic layers only includes a first and second permanent magnets.

12. The vehicle of claim 11 , wherein the first magnet is a mirror image of the second permanent magnet.

13. The vehicle of claim 9 , wherein the magnetic layers have substantially different shapes.

14. An interior permanent magnet machine comprising:
a stator including a plurality of electrical conductors; and
a rotor concentrically disposed in relation to the stator, the rotor configured to rotate relative to the stator about a rotational axis and including a plurality of polar pieces arranged annularly about the rotational axis;
wherein each of the plurality of polar pieces includes:
a first magnetic layer having a parabolic shape;
a second magnetic layer having a semi-elliptical shape; and
a third magnetic layer having a hyperbolic shape, wherein the second magnetic layer is disposed between the first magnetic layer and the second magnetic layer.

Assignees

• Gm Global Tech Operations Inc

Inventors

• Jurkovic Sinisa
• Rahman Khwaja M
• Niu Qiang
• Savagian Peter J

Classifications

• H02K1/2706 Primary

  Inner rotors · CPC title

• B32B33/00

  Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class · CPC title

• H02K1/2766 Primary

  having a flux concentration effect · CPC title

• B60L2220/50

  Structural details of electrical machines · CPC title

• Y02T10/64

  Electric machine technologies in electromobility · CPC title