Three-phase reactor

Patent metadata

Field	Value
Publication number	US-9412510-B2
Application number	US-201414527325-A
Country	US
Kind code	B2
Filing date	Oct 29, 2014
Priority date	Dec 12, 2013
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

The present application discloses a three-phase reactor, including: an upper yoke and a lower yoke, the upper yoke and the lower yoke containing a first material; and at least three first core columns, the first core columns containing a second material, and the both ends of each of the first core columns being connected with the upper yoke and the lower yoke, respectively, wherein, the relative permeability of the first material is greater than that of the second material, and at least one air gap is positioned in each of the first core columns. In the three-phase reactor proposed by the present disclosure, the yokes are made of a material different from that of the core columns, and air gaps are positioned in the core columns, so that the eddy current losses may be reduced significantly and the requirement for the use of high power may be satisfied.

First claim

What is claimed is:

1. A three-phase reactor, comprising:
an upper yoke and a lower yoke, the upper yoke and the lower yoke containing a first material; and
at least three first core columns, the first core columns containing a second material, and both ends of each of the first core columns being connected with the upper yoke and the lower yoke, respectively,
wherein the relative permeability of the first material is greater than that of the second material, and at least one air gap is positioned in each of the first core columns; and
no air gap is positioned at interfaces between the first core columns and the upper yoke or interfaces between the first core columns and the lower yoke; and
windings wound around the first core columns, wherein a minimum distance from the windings to the first core column is 3-5 times of a thickness of the air gap.

2. The three-phase reactor according to claim 1 , wherein the relative permeability of the first material is larger than 10 times of the relative permeability of the second material.

3. The three-phase reactor according to claim 1 , wherein the first material is one material selected from the group of Fe-based amorphous, Fe-based nanocrystalline, permalloy and silicon steel sheet.

4. The three-phase reactor according to claim 1 , wherein the initial relative permeability of the second material is greater than or equal to 40.

5. The three-phase reactor according to claim 1 , wherein the second material is an alloy powder core, which is one selected from the group of a Fe-based amorphous powder core, a Co-based amorphous powder core, a Fe-based nanocrystalline powder core, a Co-based nanocrystalline powder core, a Fe—Si powder core, a Fe—Si—Al powder core and a Fe—Ni powder core.

6. The three-phase reactor according to claim 1 , wherein the windings are copper foils, aluminum foils, copper wires or aluminum wires.

Assignees

• Delta Electronics Shanghai Co

Inventors

• Chu Jiang
• Huang Zhi
• Hu Juming

Classifications

• H01F27/346 Primary

  Preventing or reducing leakage fields (using magnetic shields H01F27/36; using auxiliary windings H01F27/38) · CPC title

• H01F2003/106

  Magnetic circuits using combinations of different magnetic materials · CPC title

• H01F3/14

  Constrictions; Gaps, e.g. air-gaps (in magnetic shunt paths H01F3/12) · CPC title

• H01F30/12

  Two-phase, three-phase or polyphase transformers · CPC title