MULTI-PHASE TRANSFORMER AND TRANSFORMATION SYSTEM

• US 20130113587A1
• Filed: 07/22/2011
• Published: 05/09/2013
• Est. Priority Date: 07/27/2010
• Status: Active Grant

• Current Assignee: Klaus Schmidt
• Original Assignee: Klaus Schmidt
• Inventors: Inoue, Kenichi, Miyazaki, Takayoshi, Zaitsu, Kyoji, Inoue, Koji
• Granted Patent: US 9,263,181 B2
• Time in Patent Office: Days
• US Class Current: 336/5
• CPC Class Codes: H01F 27/2847 Sheets; Strips H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/2871 Pancake coils
• CPC Class Codes: H01F 30/12 Two-phase, three-phase or polyphase transformers

Abstract

Provided are a multi-phase transformer having an easier-producible structure, and a transformation system wherein a plurality of such transformers are serially connected. Disclosed is a three-phase transformer (Tra) provided with three coils (1u, 1v, 1w) and a pair of magnetic members (21, 22) respectively provided on opposite ends in the axial direction of the coils (1u, 1v, 1w), wherein the coils (1u, 1v, 1w) are respectively provided with first and second sub-coils (11u, 12u; 11v, 12v; 11w, 12w).

Claims

1. A multi-phase transformer comprising:

a plurality of coils; and

a pair of magnetic members disposed at respective opposite ends of the plural coils in axial directions thereof,

wherein each of the plural coils includes a plurality of sub-coils.

2. The multi-phase transformer according to claim 1, wherein the magnetic members are formed using soft magnetic powder.

3. The multi-phase transformer according to claim 1, wherein the magnetic members are constituted by winding strip-like soft magnetic members such that widthwise directions of the soft magnetic members are aligned with the axial directions of the plural coils.

4. The multi-phase transformer according to claim 3, further comprising an insulating layer between turns of the wound soft magnetic member.

5. The multi-phase transformer according to claim 1 any of claims 1 to wherein each of the plural sub-coils is constituted by winding a strip-like conductor member such that a widthwise direction of the conductor member is aligned with the axial direction of the corresponding coil.

6. The multi-phase transformer according to claim 5, wherein the conductor member includes a soft magnetic member disposed on one lateral surface of the conductor member, the one lateral surface being faced perpendicularly to the axial direction.

7. The multi-phase transformer according to claim 6, wherein a thickness of the soft magnetic member in a direction perpendicular to the axial direction is not larger than a skin depth at a frequency of AC power that is supplied to the multi-phase transformer.

8. The multi-phase transformer according to claim 6, wherein the soft magnetic member is coated over the conductor member.

9. The multi-phase transformer according to claim 6, wherein the soft magnetic member is press-bonded to the conductor member.

10. The multi-phase transformer according to claim 1, wherein the plural sub-coils are stacked in the axial direction of the corresponding coil.

11. The multi-phase transformer according to claim 1, wherein the plural sub-coils are stacked in a radial direction of the corresponding coil.

12. The multi-phase transformer according to claim 1, wherein the plural sub-coils are each constituted by winding a plurality of strip-like conductor members that are successively overlaid with an insulating material interposed between the conductor members.

13. The multi-phase transformer according to claim 12, wherein, given that numerals being one or more integers and differing from each other are m and n, the plural conductor members are present in number (m+n),

the number m of conductor members are connected in series when m is 2 or more, and

the number n of conductor members are connected in series when n is 2 or more.

14. The multi-phase transformer according to claim 13, wherein a thickness of each of the number m of conductor members:

a thickness of each of the number n of conductor members=n;

m is satisfied.

15. The multi-phase transformer according to claim 1, wherein the plural coils are disposed side by side in a same plane such that the axial directions of the plural coils are parallel to each other.

16. The multi-phase transformer according to claim 1, further comprising a heat transfer member filled in gaps that are generated between the plural coils and the magnetic members.

17. The multi-phase transformer according to claim 1, wherein a thickness of the conductor member is not larger than ⅓

of a skin depth at a frequency of AC power that is supplied to the multi-phase transformer.

18. A transformation system including a plurality of transformers connected in series,

wherein at least one of the plural transformers is the multi-phase transformer comprising:

a plurality of coils; and

a pair of magnetic members disposed at respective opposite ends of the plural coils in axial directions thereof,

wherein each of the plural coils includes a plurality of sub-coils.