Rotor apparatus for an electric machine
AssigneeJaguar Land Rover Limited
InventorsTiago Cesa, Muhammed Fasil Palakkunnu Veettil, Istvan Kiraly
Life of this patent
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Abstract
The present disclosure relates to a rotor for an electric machine. The rotor has a plurality of rotor poles each having at least one aperture. The at least one aperture includes a chamber for receiving a magnet; and at least one flux barrier for controlling the path through which magnetic flux flows in the rotor. The rotor poles each have at least one flux guide for guiding magnetic flux across the at least one flux barrier during a demagnetization event. The flux guide(s) form a constriction between the magnet receiving chamber and the flux barrier. The present disclosure also relates to an electric machine comprising a rotor; and a vehicle comprising an electric machine.
Claims11
A rotor for an electric machine, the rotor comprising:
- a plurality of rotor poles, the rotor poles each comprising a plurality of magnet layers, and wherein a first magnet layer of the plurality of magnet layers comprises:
- a first aperture comprising:
- a first chamber for receiving a first magnet;
- and
- at least one first flux barrier for controlling a path through which magnetic flux flows in the rotor;
- wherein the rotor poles each have a direct axis corresponding to a central radial axis of the rotor pole and the first magnet layer each of the rotor poles comprise at least one first flux guide for guiding magnetic flux across the at least one first flux barrier during a demagnetization event, the or each first flux guide forming a constriction between the first chamber and the at least one first flux barrier, and wherein the or each first flux guide is configured such that the constriction has a span which is smallest in a direction substantially perpendicular to a central longitudinal axis of the first chamber and a transverse axis of the first chamber and parallel to a vertical axis of the first chamber, the transverse axis and the vertical axis each perpendicular to the central longitudinal axis, the transverse axis perpendicular to the direct axis, and
- wherein a first of the at least one first flux barrier is disposed at a first end of the first aperture and a second of the at least one first flux barrier is disposed at a second end of the first aperture, wherein the first chamber extends in a transverse manner from the first end to the second end along the transverse axis, and wherein each of the first and the second of the least one first flux barrier is annular and has a C-shape;
- and
- wherein a second magnet layer of the plurality of magnet layers comprises:
- a second aperture comprising a second chamber and at least one second flux barrier, the second chamber for receiving a second magnet, the second magnet oriented at an acute angle relative to the direct axis;
- and
- at least one second flux guide, wherein the second aperture comprises at least one aperture expansion, the at least one aperture expansion being formed opposite to the at least one second flux guide.
A rotor for an electric machine, the rotor comprising:
- a plurality of rotor poles, the rotor poles each comprising:
- a first aperture comprising:
- a first chamber for receiving a first magnet;
- and
- at least one first flux barrier for controlling magnetic flux in the rotor, wherein the first aperture is arranged in a first magnet layer of a plurality of magnet layers, a second magnet layer of the plurality of magnet layers comprising a pair of inclined second magnets accommodated in respective second apertures, the first aperture positioned intermediate the respective second apertures, wherein each second aperture comprises a second chamber, at least one second flux barrier, and at least one aperture expansion, each aperture expansion being formed opposite to a respective second flux guide of the second magnet layer;
- and
- wherein the at least one first flux barrier is annular and has a C-shape, wherein each rotor pole includes a first flux guide for guiding magnetic flux across the at least one first flux barrier during a demagnetization event, the first flux guide forming a constriction between the first chamber and the at least one first flux barrier, and wherein the first flux guide is configured such that the constriction has a span which is smallest in a direction substantially perpendicular to a central longitudinal axis of the first chamber and a transverse axis of the first chamber and parallel to a vertical axis of the first chamber, the transverse axis and the vertical axis each perpendicular to the central longitudinal axis.
Dependencies are inferred from the claim text.