Reluctance rotor with mechanical stabilizing

Patent metadata

Field	Value
Publication number	US-9800125-B2
Application number	US-201515300422-A
Country	US
Kind code	B2
Filing date	Mar 13, 2015
Priority date	Mar 31, 2014
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

A reluctance rotor for an electric machine includes rotor lamination layers made of a ferromagnetic material, wherein each rotor lamination layer has a flux barrier formed by a recess in the rotor lamination layer. In order to toughen the reluctance rotor for a high torque and a high rotational speed, the reluctance rotor has an intermediate part with recesses arranged between a first and a second rotor lamination layer, and separators delimiting the recesses from one another. The recesses of the intermediate part and the separators are arranged axially between the flux barriers, wherein the recesses of the intermediate part and the flux barriers together delimit a space. The space is cast with a non-ferromagnetic casting compound.

First claim

The invention claimed is:

1. A reluctance rotor for an electric machine, comprising:
a laminated core including rotor lamination layers made of a ferromagnetic material, each rotor lamination layer having a flux barrier formed by a recess in the ferromagnetic material;
an intermediate part arranged between adjacent rotor lamination layers, said intermediate part including recesses and separators delimiting the recesses from one another, said recesses and separators being axially arranged between the flux barriers, thereby delimiting a space between the recesses of the intermediate part and the flux barriers;
a non-ferromagnetic casting compound received in the space; and
separate clamping elements formed from the casting compound at least at one axial end of the reluctance rotor, said clamping elements bearing against the axial end in an overlapping region on the laminated core and configured to hold together the rotor lamination layers in cooperation with the casting compound in the space.

2. The reluctance rotor of claim 1 , wherein the separators are configured to divert a centrifugal force radially inwardly in the intermediate part, when the reluctance rotor rotates.

3. The reluctance rotor of claim 1 , wherein each of the separators extends in its longitudinal extent toward an outer circumference of the reluctance rotor.

4. The reluctance rotor of claim 1 , wherein each of the separators extends in its longitudinal extent at an acute angle or parallel to a q-axis of the reluctance rotor.

5. The reluctance rotor of claim 1 , wherein the intermediate part is made of a material which has, at least in a radial direction, a tensile strength which is greater than a tensile strength of the ferromagnetic material of the rotor lamination layers.

6. The reluctance rotor of claim 1 , wherein the intermediate part is formed from a non-ferromagnetic material.

7. The reluctance rotor of claim 1 , wherein the casting compound is electrically conductive and is formed from a plastics material with an electrically conductive filler.

8. The reluctance rotor of claim 7 , wherein the plastics material includes electrically conductive fibers or an electrically conductive granulate as the filler.

9. The reluctance rotor of claim 1 , wherein the casting compound comprises aluminum, an aluminum alloy, a fiber-filled plastics material, or resin.

10. The reluctance rotor of claim 1 , wherein at least one of the clamping elements includes a bore or a weight for balancing the reluctance rotor.

11. The reluctance rotor of claim 1 , wherein the recesses and the separators of the intermediate part define together a total surface area of a contour which corresponds to a contour of the flux barrier of at least one of the adjacent rotor lamination layer.

12. The reluctance rotor of claim 1 , wherein the rotor lamination layers each comprises further flux barriers, said intermediate part having further recesses and separators arranged in pairs between one of the flux barriers of one of the adjacent rotor lamination layers and one of the flux barriers of the other one of the adjacent rotor lamination layers, thereby delimiting further spaced which are cast with the casting compound.

13. The reluctance rotor of claim 1 , further comprising at least one further said intermediate part arranged between two of the rotor lamination layers.

14. The reluctance rotor of claim 1 , further comprising a stator having coils for rotating the reluctance rotor at a rotational speed by an alternating supply of current to the coils.

15. A motor vehicle, comprising a reluctance motor configured as a drive motor for moving the motor vehicle, said reluctance motor comprising a laminated core including rotor lamination layers made of a ferromagnetic material, each rotor lamination layer having a flux barrier formed by a recess in the ferromagnetic material, an intermediate part arranged between adjacent rotor lamination layers, said intermediate part including recesses and separators delimiting the recesses from one another, said recesses and separators being axially arranged between the flux barriers, thereby delimiting a space between the recesses of the intermediate part and the flux barriers, a non-ferromagnetic casting compound received in the space, separate clamping elements formed from the casting compound at least at one axial end of the reluctance rotor, said clamping elements bearing against the axial end in an overlapping region on the laminated core and configured to hold together the rotor lamination layers in cooperation with the casting compound in the space, and a stator having coils for rotating the reluctance rotor at a rotational speed by an alternating supply of current to the coils.

Assignees

• Siemens Ag

Inventors

• Ballweg Marion
• BüTTNER KLAUS
• Kirchner Klaus

Classifications

• H02K1/22

  Rotating parts of the magnetic circuit · CPC title

• H02K19/14 Primary

  having additional short-circuited windings for starting as asynchronous motors · CPC title

• B60L2220/50

  Structural details of electrical machines · CPC title

• H02K7/04

  Balancing means · CPC title

• H02K1/246

  Variable reluctance rotors · CPC title