Rotor Topology for High-Speed Electric Machines

Abstract

A rotor core for a salient pole rotor of an electric machine for holding magnetic-field- generating components of the salient pole rotor is provided. The rotor core is formed with a salient pole topology and has a rotor yoke and salient poles which project radially from the rotor yoke and are formed in one piece with the rotor yoke. The salient poles each have a pole shaft for holding the magnetic-field-generating components and a pole shoe, and the rotor core has supporting web arrangements which are formed in one part with the salient poles and the rotor yoke and which, to counteract loads acting on the pole shoe during operation of the electric machine, connect pole shoe regions of the pole shoe that project laterally on the corresponding pole shaft to the rotor yoke.

Claims

1. A rotor core for a salient pole rotor of an electric machine for holding magnetic-field-generating components of the salient pole rotor, the rotor core being formed with a salient pole topology, the rotor core comprising: a rotor yoke; and salient poles which project radially from the rotor yoke and are formed in one piece with the rotor yoke, wherein: the salient poles each have a pole shaft for holding the magnetic-field-generating components and a pole shoe, and the rotor core has supporting web arrangements which are formed in one part with the salient poles and the rotor yoke and which, to counteract loads acting on the pole shoe during operation of the electric machine, connect pole shoe regions of the pole shoe that project laterally from the corresponding pole shaft to the rotor yoke.

2. The rotor core according to claim 1, wherein a respective supporting web arrangement is arranged in each of pole gaps formed between two adjacent salient poles of the supporting web arrangements and connects the pole shoe regions of the adjacent salient poles mechanically to the rotor yoke.

3. The rotor core according to claim 2, wherein the supporting web arrangements are Y-shaped or V-shaped.

4. The rotor core according to claim 1, wherein the rotor core consists of axially stacked, mechanically connected, one-piece electrical sheet laminations.

5. The rotor core according to claim 1, wherein the supporting web arrangements are configured to fix magnetic-field-generating components in a form of rotor windings by clamping the rotor windings between a respective pole shaft and a respective supporting web arrangement on the respective pole shaft.

6. A salient pole rotor for an electric machine, the salient pole rotor comprising: magnetic-field-generating components; and the rotor core according to claim 1.

7. The salient pole rotor according to claim 6, wherein the magnetic-field-generating components have energizable rotor windings.

8. An electric machine for a motor vehicle, the electric machine comprising: a stator; and a salient pole rotor according to claim 6, wherein the salient pole rotor is mounted rotatably in relation to the stator.

9. A motor vehicle comprising at least one electric machine according to claim 8.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0020] FIG. 1 shows a partial cross-sectional illustration of components of an electric machine.

DETAILED DESCRIPTION OF THE DRAWING

[0021] The electric machine 1 shown in FIG. 1 can be used as a prime mover for an electrified motor vehicle and comprises a stator 2 and a salient pole rotor 3 which is mounted rotatably in relation to the stator 2 about a rotation axis R. The stator 2 comprises a stator core 4 with energizable stator windings, not shown here. The salient pole rotor 3 has a rotor core 5 with magnetic-field-generating components, not shown here, in particular energizable rotor windings.

[0022] The rotor core 5 has a rotor yoke 6 and salient poles 7. The salient poles 7 have a pole shaft 8, which for example carries a rotor winding, and a pole shoe 9. Pole shoe regions 10 of the pole shoe 9 protrude here laterally from the pole shaft 8 in the circumferential direction. To stabilize the salient poles 7, the rotor core 5 additionally has supporting web arrangements 11, and here a supporting web arrangement 11 is arranged in each pole gap 12 between two adjacent salient poles 7 and mechanically connects the pole shoe regions 10, facing one another, of the adjacent salient poles 7 to the rotor yoke 6. The supporting web arrangements 11 are formed in one piece with the salient poles 7 and the rotor yoke 6, so that the rotor core 5 is formed in one piece, at least in the cross-sectional plane perpendicularly to the rotation axis R.

[0023] Here, a supporting web arrangement 11 has three supporting webs 11a arranged in a Y shape, with two supporting webs 11a being arranged in a V shape and connected to the pole shoe regions 10 and an apex of the V-shaped arrangement being connected to a supporting web 11a connected to the rotor yoke 6. This supporting web arrangement 11 provides a radial force which is effective oppositely to the centrifugal force acting during operation of the salient pole rotor 3 and by way of which the salient poles 7 are stabilized, in particular in the region of the pole shoe 9. The electric machine 1 can thus provide high rotational speeds.

[0024] The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.