PERMANENT MAGNET DC INDUCTOR

• US 20100194512A1
• Filed: 02/04/2010
• Published: 08/05/2010
• Est. Priority Date: 02/05/2009
• Status: Active Grant

• Current Assignee: ABB Schweiz AG (ABB Limited)
• Original Assignee: Abb Oy (ABB Limited)
• Inventors: PIETERIS, Paulius
• Granted Patent: US 9,030,282 B2
• Time in Patent Office: Days
• US Class Current: 336/110
• CPC Class Codes: H01F 2003/103 Magnetic circuits with permanent magnets
• CPC Class Codes: H01F 27/24 Magnetic cores
• CPC Class Codes: H01F 3/14 Constrictions; Gaps, e.g. air-gaps in magnetic shunt paths H01F3/12
• CPC Class Codes: H01F 37/00 Fixed inductances not covered by group H01F17/00

Abstract

A permanent magnet DC inductor is disclosed which includes at least two separate and individual magnetic inductors, each having its own core structure and forming closed individual magnetic paths having at least one magnetic gap. Windings are provided on the magnetic cores, and at least one permanent magnet piece is provided with each inductor. The separate magnetic cores having the at least one magnetic gap are arranged against each other to form external magnetic gaps with the permanent magnet pieces arranged inside the external magnetic gaps on both sides of the at least one magnetic gap.

Claims

1. A permanent magnet DC inductor, comprising:

at least two separate and individual magnetic inductors, each having a core structure and forming closed individual magnetic paths having at least one magnetic gap;

a winding provided on each core structure; and

at least one permanent magnet piece for each core structure, wherein the core structures having the at least one magnetic gap are arranged against each other to form external magnetic gaps, with the permanent magnet pieces arranged inside the external magnetic gaps on both sides of the at least one magnetic gap.

2. A permanent magnet DC inductor as claimed in claim 1, comprising:

at least two windings, and the magnetic inductors being arranged to form two separate inductive components coupled physically and magnetically by the at least one permanent magnet in-between.

3. A permanent magnet DC inductor as claimed in claim 1, wherein the at least one permanent magnet piece is configured to produce magnetic fluxes arranged to flow in both of the separate magnetic cores.

4. A permanent magnet DC inductor as claimed in claim 1, wherein at least one of the windings of an individual inductor partly is configured to produce a magnetic flux which supports a magnetic flux produced by at least one of the permanent magnets.

5. A permanent magnet DC inductor as claimed in claim 1, wherein the at least one permanent magnet piece is configured to produce magnetic fluxes arranged to oppose a magnetic flux of the windings of two individual core structures.

6. A permanent magnet DC inductor as claimed in claim 1, wherein the magnetic gaps inside the individual magnetic inductors are positioned to offset each other.

7. A permanent magnet DC inductor as claimed in claim 1, wherein the magnetic gaps inside the individual inductors are non-uniform in shape.

8. A permanent magnet DC inductor as claimed in claim 1, wherein the core structures each comprise:

side legs; and

a T-shape center leg joining the legs, whereby flux produced by the permanent magnet pieces flows via the side legs and center legs of both separate magnetic cores, and flux of the windings flows in the separate core structures in which the respective windings are arranged.

9. A permanent magnet DC inductor as claimed in claim 1, wherein the core structures each comprise:

side legs, whereby flux produced by the at least one permanent magnet piece flows via the side legs of both core structures and the flux of the windings flows in the separate core structures in which the respective windings are arranged.

10. A permanent magnet DC inductor as claimed in claim 1, comprising:

a magnet holder for holding the permanent magnet pieces, which holder at least partially surrounds the permanent magnet pieces to keep the magnets in position with respect to each other.

11. A permanent magnet DC inductor as claimed in claim 2, wherein the at least one permanent magnet piece is configured to produce magnetic fluxes arranged to flow in both of the separate magnetic cores.

12. A permanent magnet DC inductor as claimed in claim 11, wherein at least one of the windings of an individual inductor partly is configured to produce a magnetic flux which supports a magnetic flux produced by at least one of the permanent magnets.

13. A permanent magnet DC inductor as claimed in claim 12, wherein the at least one permanent magnet piece is configured to produce magnetic fluxes arranged to oppose a magnetic flux of the windings of two individual core structures.

14. A permanent magnet DC inductor as claimed in claim 13, wherein the magnetic gaps inside the individual magnetic inductors are positioned to offset each other.

15. A permanent magnet DC inductor as claimed in claim 14, wherein the magnetic gaps inside the individual inductors are non-uniform in shape.

16. A permanent magnet DC inductor as claimed in claim 15, wherein the core structures each comprise:

side legs; and

a T-shape center leg joining the legs, whereby flux produced by the permanent magnet pieces flows via the side legs and center legs of both separate magnetic cores, and flux of the windings flows in the separate core structures in which the respective windings are arranged.

17. A permanent magnet DC inductor as claimed in claim 16, wherein the core structures each comprise:

side legs, whereby flux produced by the at least one permanent magnet piece flows via the side legs of both core structures and the flux of the windings flows in the separate core structures in which the respective windings are arranged.

18. A permanent magnet DC inductor as claimed in claim 17, comprising:

a magnet holder for holding the permanent magnet pieces, which holder at least partially surrounds the permanent magnet pieces to keep the magnets in position with respect to each other.