Multi-phase transformer

Patent metadata

Field	Value
Publication number	US-12211640-B2
Application number	US-202117564846-A
Country	US
Kind code	B2
Filing date	Dec 29, 2021
Priority date	Dec 21, 2016
Publication date	Jan 28, 2025
Grant date	Jan 28, 2025

Abstract

A multi-phase transformer includes a centrally-disposed first core, a plurality of second cores each provided outside the first core so as to constitute a loop-shaped magnetic path with respect to the first core, and a primary winding and a secondary winding wound on each of the second cores.

First claim

What is claimed is:

1. A multi-phase transformer comprising:
a centrally-disposed first core, wherein the first core is non-rotatable;
a plurality of second cores each provided outside the first core so as to constitute a loop-shaped magnetic path with respect to the first core, wherein the first core and the second core are engaged with each other; and
a primary winding and a secondary winding wound on each of the second cores, wherein each of the second cores integrally consists essentially of:
two radial leg portions each facing the exterior of the first core at one end and extending radially toward a center point of the multi-phase transformer, wherein the two radial leg portions are non-parallel with each other; and
a continuous, unitary outer peripheral portion connecting the other ends of the two radial leg portions in a circumferential direction of the multi-phase transformer, wherein the other end of the one radial leg portion is connected to the one end of the outer peripheral portion in the circumferential direction and the other end of the other radial leg portion is connected to the other end of the outer peripheral portion in the circumferential direction,
wherein the primary winding is wound around one of the radial leg portions of a second core and the secondary winding is wound around the other of the corresponding radial leg portions of the same second core as the primary winding; and
further comprising a non-magnetic linear core fixation member provided between the outer peripheral portions of the adjoining second cores.

2. The multi-phase transformer according to claim 1 , wherein the second cores have the same shape.

3. The multi-phase transformer according to claim 1 , wherein the second cores are disposed around the first core rotationally symmetrically with respect to the center of the first core.

4. The multi-phase transformer according to claim 1 , wherein a spacer constituting a magnetic path is provided between the exterior of the first core and each of the second cores.

5. The multi-phase transformer according to claim 1 , wherein the exterior of the first core is round in shape corresponding to the shape of the one end of the radial leg portions of the second cores.

6. The multi-phase transformer according to claim 1 , wherein the exterior of the first core is polygonal in shape corresponding to the shape of the one end of the radial leg portions of the second cores.

7. The multi-phase transformer according to claim 1 , wherein only a part of the core fixation member is made of a non-magnetic material.

8. The multi-phase transformer according to claim 1 , wherein a round cylindrical structure is formed onto the core fixation member and the outer peripheral portions of the second cores.

9. The multi-phase transformer according to claim 8 , wherein the cylindrical structure made of a non-magnetic material is integrally and fixedly fitted onto the core fixation member and the outer peripheral portions of the second cores.

10. The multi-phase transformer according to claim 8 , wherein the core fixation member or the cylindrical structure has predetermined holes.

11. The multi-phase transformer according to claim 1 , wherein the core fixation member is used to assemble or secure the multi-phase transformer.

12. The multi-phase transformer according to claim 1 , wherein the multi-phase transformer is a three-phase transformer to which three-phase alternating current (AC) voltage is applied.

13. The multi-phase transformer according to claim 12 , wherein the first windings of the three-phase transformer are connected by delta connection.

14. The multi-phase transformer according to claim 12 , wherein
the number of the second cores is an integral multiple of 3, and
the windings wound on the second cores are grouped into three.

Assignees

• Fanuc Corp

Inventors

• Maeda Takuya

Classifications

• H01F29/14

  with variable magnetic bias ({amplitude modulation by means of variable impedance element H03C1/08} ; magnetic amplifiers H03F; {circuits for automatic telephonic communication H04M3/00}) · CPC title

• H01F27/04

  Leading of conductors or axles through casings, e.g. for tap-changing arrangements · CPC title

• H01F27/28

  Coils; Windings; Conductive connections · CPC title

• H01F29/02

  with tappings on coil or winding; with provision for rearrangement or interconnection of windings · CPC title

• H01F27/306

  Fastening or mounting coils or windings on core, casing or other support · CPC title