Reluctance rotor with runup aid

Patent metadata

Field	Value
Publication number	US-10284032-B2
Application number	US-201314783509-A
Country	US
Kind code	B2
Filing date	Sep 27, 2013
Priority date	Apr 12, 2013
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

A rotor for a reluctance motor includes a laminate stack having layers. Each layer has a plurality of flux-conducting sections formed in each case by a magnetically conductive rotor lamination and extending transversely to a corresponding q axis. The flux-conducting sections are separated from one another by nonmagnetic flux barrier regions. An electrically conductive and non-ferromagnetic filler material is arranged in a plurality or all of the flux barrier regions of the layers to electrically connect the flux barrier regions of adjacent layers to one another so that cage bars of a rotor cage of the rotor which extend axially parallel or skewed with respect to the axis of rotation are formed by the filler material in the flux barrier regions.

First claim

What is claimed is:

1. A rotor for a reluctance motor, said rotor comprising:
a laminate stack defining an axis of rotation and having layers, each layer including a magnetically conductive rotor plate forming flux-conducting sections which extend transversely relative to a q-axis and are separated from each other by non-magnetic flux barrier regions;
an electrically conductive and non-ferromagnetic filler material arranged in at least several of the flux barrier regions of the layers to electrically connect flux barrier regions of neighboring ones of the layers and thereby form in the flux barrier region cage bars of a rotor cage of the rotor in axially parallel or skewed relationship to the axis of rotation, and
an intermediate disk formed from the filler material and arranged between two adjacent ones of the layers,
wherein the cage bars and the intermediate disk are die-cast from the filler material concurrently to form a unitary structure.

2. The rotor of claim 1 , wherein the filler material has a region made at least of one element selected from the group consisting of copper, aluminium, magnesium, and an alloy.

3. The rotor of claim 2 , wherein the alloy is an aluminium alloy.

4. The rotor of claim 3 , wherein the aluminium alloy is silumin.

5. The rotor of claim 1 , wherein the filler material is sized to only partially fill the flux barrier regions.

6. The rotor of claim 1 , wherein the laminate stack has opposite axial ends, and further comprising electrically conductive and non-ferromagnetic disks arranged on the axial ends, respectively, and die-cast from the filler material concurrently to electrically connect the cage bars and to thereby form short-circuit rings of the rotor cage.

7. The rotor of claim 1 , wherein an effective conducting cross-section of the intermediate disk between two cage bars an is low enough that the electrical resistance of the effective conducting cross-section is greater than an electrical resistance of each of the cage bars.

8. The rotor of claim 1 , wherein the rotor plates of the layers are bonded together by the filler material to form a rigid entity.

9. The rotor of claim 1 , wherein the two adjacent ones of the layers are held apart by spacing pieces.

10. An electrical drive arrangement, comprising an electrical machine configured to operate as synchronous reluctance motor or asynchronous motor, said electric machine including a rotor comprising a laminate stack defining an axis of rotation and having layers, each layer including a magnetically conductive rotor plate forming flux-conducting sections which extend transversely relative to a q-axis and are separated from each other by non-magnetic flux barrier regions, and an electrically conductive and non-ferromagnetic filler material arranged in at least several of the flux barrier regions of the layers to electrically connect flux barrier regions of neighboring ones of the layers and thereby form in the flux barrier region cage bars of a rotor cage of the rotor in axially parallel or skewed relationship to the axis of rotation, and an intermediate disk formed from the filler material and arranged between two adjacent ones of the layers, wherein the cage bars and the intermediate disk are die-cast from the filler material concurrently to form a unitary structure.

11. The drive arrangement of claim 10 , further comprising at least one further said electrical machine, and a common inverter to connect the electrical machine and the further electrical machine.

12. The electrical drive arrangement of claim 10 , wherein the filler material has a region made at least of one element selected from the group consisting of copper, aluminium, magnesium, and an alloy.

13. The electrical drive arrangement of claim 10 , wherein the filler material is sized to only partially fill the flux barrier regions.

14. The electrical drive arrangement of claim 10 , wherein the laminate stack has opposite axial ends, and further comprising electrically conductive and non-ferromagnetic disks arranged on the axial ends, respectively, to electrically connect the cage bars and to thereby form short-circuit rings of the rotor cage.

15. The electrical drive arrangement of claim 14 , wherein the disks are made of a material which has a lower electrical conductivity than a material of the filler material.

16. The electrical drive arrangement of claim 10 , wherein an effective conducting cross-section of the intermediate disk between two cage bars is low enough that the electrical resistance of the effective conducting cross-section is greater than an electrical resistance of each of the cage bars.

17. The electrical drive arrangement of claim 10 , wherein the rotor plates of the layers are bonded together by the filler material to form a rigid entity.

18. The drive arrangement of claim 10 , wherein the two adjacent ones of the layers are held apart by spacing pieces.

19. A method for manufacturing a rotor, comprising:
forming a laminate stack from a plurality of layers, each layer including a magnetically conductive rotor plate forming flux-conducting sections which extend transversely relative to a q-axis and are separated from each other by non-magnetic flux barrier regions, wherein the flux-conducting sections are separated from each other by non-magnetic flux barrier regions;
arranged in at least several of the flux barrier regions of the layers an electrically conductive and non-ferromagnetic filler material to electrically connect flux barrier regions of neighboring ones of the layers and thereby form in the flux barrier region cage bars of a rotor cage of the rotor in axially parallel or skewed relationship to the axis of rotation,
forming an intermediate disk from the filler material and arranging the intermediate disk between two adjacent ones of the layers,
wherein the cage bars and the intermediate disk are die-cast at a same time from the filler material to form a unitary structure.

20. The method of claim 19 , further comprising die-casting short-circuit rings of the rotor cage on opposite axial ends of the laminate stack at the same time to electrically connect the cage bars.

21. The method of claim 19 , wherein the two adjacent ones of the layers are held apart by spacing pieces to allow inflow of the filler material during die-casting.

Assignees

• Siemens Ag

Inventors

• BüTTNER KLAUS
• Cerny Marco
• Fischer Ralf
• Warmuth Matthias

Classifications

• H02K19/14

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

• H02K15/02

  of stator or rotor bodies · CPC title

• H02K19/06

  Motors having windings on the stator and a variable-reluctance soft-iron rotor without windings, e.g. inductor motors · CPC title

• H02K1/246 Primary

  Variable reluctance rotors · CPC title

• H02K1/24 Primary

  Rotor cores with salient poles {; Variable reluctance rotors} · CPC title