Interior permanent magnet machine
View Patent ↗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.
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.