MAGNETIC CORE, AND CHOKE OR TRANSFORMER HAVING SUCH A MAGNETIC CORE

• US 20180218826A1
• Filed: 07/10/2015
• Published: 08/02/2018
• Est. Priority Date: 07/10/2015
• Status: Active Application

• Current Assignee: James Millsap
• Original Assignee: James Millsap
• Inventors: MILLSAP, James
• Application Number:
  US15/742,904
• Publication Number:
  US 20180218826A1
• Time in Patent Office: Days
• CPC Class Codes: H01F 2003/106 Magnetic circuits using combinations of different magnetic materials
• CPC Class Codes: H01F 27/263 Fastening parts of the core together
• CPC Class Codes: H01F 3/06 made from wires
• CPC Class Codes: H01F 3/14 Constrictions; Gaps, e.g. air-gaps in magnetic shunt paths H01F3/12
• CPC Class Codes: H01F 30/12 Two-phase, three-phase or polyphase transformers

Abstract

The invention relates to a magnetic core (10) for a three-phase choke or a three-phase transformer, comprising three winding legs (11, 12, 13) for holding electrical windings (21, 22, 23), wherein the winding legs (11, 12, 13) are arranged substantially parallel to each other in the shape of a triangle, wherein the winding legs (11, 12, 13) are connected by means of an annular or convex polygonal yoke (14), which lies on the winding legs (11, 12, 13). The invention also relates to a choke or transformer having such a magnetic core (10).

Claims

1. Magnetic core (10) for a three-phase choke or a three-phase transformer having three winding legs (11, 12, 13) for holding electrical windings (21, 22, 23), wherein the winding legs (11, 12, 13) are arranged substantially parallel to each other in the shape of a triangle,

characterized in that

the winding legs (11, 12, 13) are connected by an annular or convex polygonal yoke (14), which rests on the winding legs (11, 12, 13).

2. Magnetic core(10) according to claim 1,

characterized in that

the yoke (14) rests on the longitudinal ends of the winding legs (11, 12, 13).

3. Magnetic core (10) according to claim 1 or 2,

characterized in that

the yoke (14) has three cross-connecting legs (15, 16, 17), each cross-connecting leg (15, 16, 17) connecting two directly adjacent winding legs (11, 12, 13).

4. Magnetic core (10) according to claim 3,

characterized in that

a first cross-connecting leg (15) connects a first and second winding leg (11, 12) to each other, a second cross-connecting legs (16) connects a second and third winding leg (12, 13) to each other, and a third cross-connecting leg (17) connects the third and first winding legs (13, 11) to each other.

5. Magnetic core (10) according to any one of the preceding claims,

characterized in that

the yoke (14), in particular the cross-connecting legs (15, 16, 17), form a closed shaped element having a preferably centrally arranged through opening (19).

6. Magnetic core (10) according to any one of the preceding claims,

characterized in that

the yoke (14) is formed from a single part or multiple parts.

7. Magnetic core (10) according to any one of the preceding claims,

characterized in that

the yoke (14) and/or the winding legs (11, 12, 13) are formed by a compressed powder composite material.

8. Magnetic core (10) according to claim 7,

characterized in that

the powder composite material comprises iron, nickel, silicon, aluminium and/or molybdenum.

9. Magnetic core (10) according to any one of the preceding claims,

characterized in that

the yoke (14) is in the shape of a triangle or hexagon.

10. Magnetic core (10) according to any one of the preceding claims,

characterized in that

the yoke (14) has an equilateral and/or equal-angled design, in particular, having the form of a regular polygon.

11. Magnetic core (10) according to any one of the preceding claims,

characterized in that

the winding legs (11, 12, 13) have a circular or rectangular cross-section.

12. Magnetic core (10) according to any one of the

preceding claims,

characterized in that the yoke (14) is adhesively bonded to the winding legs (11, 12, 13), in particular to the longitudinal ends of the winding legs (11, 12, 13).

13. Magnetic core (10) according to any one of the preceding claims,

characterized in that

a discharge leg, which is connected to the yoke (14), is arranged centrally between the three winding legs (11, 12, 13).

14. Three-phase choke or three-phase transformer having a magnetic core (10) according to any one of the preceding claims and having at least one electrical winding (21, 22, 23), which is wound around one of the winding legs (11, 12, 13).

15. Choke or transformer according to claim 14,

characterized in that

the winding (21, 22, 23) is formed by a flat wire, in particular a flat enamelled copper wire.