Rotor for rotating electric machine

Patent metadata

Field	Value
Publication number	US-10910893-B2
Application number	US-201615750394-A
Country	US
Kind code	B2
Filing date	Jun 24, 2016
Priority date	Aug 5, 2015
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

A rotor for a synchronous reluctance machine having an even number 2 p of poles circumferentially spaced at an angle α, with α=2 π/2 p, the rotor comprising a substantially cylindrical laminate stack having a plurality of magnetically conductive laminations. One or more of the magnetically conductive laminations includes non-magnetic flux barriers which are spaced from each other in the radial direction, one or more of the non-magnetic flux barriers having a first and second bridge transversally positioned in correspondence of their lateral ends and defining a first and a second air-gap with the outer rim of the magnetically conductive lamination, and further including a third and a fourth bridge transversally positioned and respectively defining together with the first and second bridge a first and a second internal space which are filled with an electrically conductive and non-magnetically conductive material.

First claim

The invention claimed is:

1. A rotor for a synchronous reluctance machine having an even number 2p of poles, where p is the number of pole pairs, said rotor comprising:
a substantially cylindrical laminate stack having a plurality of magnetically conductive laminations, wherein one or more of said magnetically conductive laminations comprises non-magnetic flux barriers which are spaced from each other in the radial direction, one or more of said non-magnetic flux barriers having a first magnetically conductive bridge defining a first air-gap with an outer rim of the one or more of said magnetically conductive laminations, and further comprising a third magnetically conductive bridge defining together with said first magnetically conductive bridge a first internal space filled with an electrically conductive and magnetically non-conductive material, and wherein said poles are circumferentially spaced at an angle α, with α=2π/2p, and said non-magnetic flux barriers are symmetrically positioned with respect to the center of each pole (P 1 , P x ), one or more of said non-magnetic flux barriers further comprising a second magnetically conductive bridge defining a second air-gap with the outer rim of said magnetically conductive lamination, and further comprising a fourth magnetically conductive bridge defining together with said second bridge a second internal space filled with an electrically conductive and magnetically non-conductive material, wherein said one or more magnetically conductive laminations comprise a number n of non-magnetic flux barriers forming a corresponding number n of first and second air-gaps having an average width d 1 , d 2 , d n and positioned at average angular positions β 1 , β 2 , β n , with respect to a center of a pole axis (R x ), with β 1 >β 2 >β n , said average width being d 1 >d 2 >d n , and the pole axis (R x ) being the axis of comparably lower magnetic conductivity.

2. The rotor according to claim 1 , wherein said third and fourth bridge define with respect to each other a third internal space.

3. The rotor according to claim 2 , wherein said third internal space is void or it is at least partially filled with an electrically conductive and magnetically non conductive material and/or a permanent magnet material.

4. The rotor according to claim 2 , wherein the outer rim of the one or more of said magnetically conductive laminations is interrupted in correspondence of one or more of said first and/or second air-gap;
wherein the average width of said first and second air-gaps increases when moving from the center of pole (P x ) toward its periphery;
wherein said first and second air-gaps are progressively positioned at angles β n with respect to the center of the poles axis (R x ), with 0<β n ≤α/2; and
wherein said one or more magnetically conductive laminations further comprises a continuous non-magnetic flux barrier which is positioned radially external with respect to the others non-magnetic flux barriers.

5. The rotor according to claim 1 , wherein one or more of said non-magnetic flux barriers are substantially arc-shaped and/or one or more of said non-magnetic flux barriers are substantially straight line-shaped.

6. The rotor according to claim 1 , wherein the outer rim of the one or more of said magnetically conductive laminations is interrupted in correspondence of one or more of said first and/or second air-gap.

7. The rotor according to claim 1 , wherein the average width of said first and second air-gaps increases when moving from the center of pole (P x ) toward its periphery.

8. The rotor according to claim 1 , wherein said first and second air-gaps are progressively positioned at angles β n with respect to the center of the poles axis (R x ), with 0<β n <α/2.

9. The rotor according to claim 1 , wherein said one or more magnetically conductive laminations further comprises a continuous non-magnetic flux barrier which is positioned radially external with respect to the others non-magnetic flux barriers.

10. The rotor according to claim 9 , wherein said continuous non-magnetic flux barrier is filled with an electrically conductive and magnetically non-conductive material.

11. The rotor according to claim 10 , wherein said continuous non-magnetic flux barrier is filled with the electrically conductive and magnetically non-conductive material selected from Aluminium, Copper and electrically conductive resins and/or a permanent magnetic material.

12. The rotor according to claim 1 , wherein said first and a second internal space are filled with an electrically conductive and magnetically non-conductive material selected from Aluminium, Copper and electrically conductive resins.

13. The rotor according to claim 1 , wherein said one or more magnetically conductive laminations comprise a number n of non-magnetic flux barriers, the corresponding third and fourth bridges being positioned at a distance L 1 , L 2 , L n from the center pole axis (R x ), where L 1 is the distance referred to the non-magnetic flux barrier radially more internal and L n is the distance referred to the non-magnetic flux barrier radially more external, and in which L 1 >L 2 >L n .

14. The rotor according to claim 1 , further comprising a rotating machine.

Assignees

• Abb Schweiz Ag

Inventors

• Kolehmainen Jere
• Kansakangas Tero
• Termini Pietro Savio

Classifications

• H02K19/14

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

• H02K17/16

  having rotors with internally short-circuited windings, e.g. cage rotors · CPC title

• H02K1/246 Primary

  Variable reluctance rotors · CPC title

• H02K1/276

  Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title