JP-3255731-U - core

Abstract

[Problem] To provide a magnetic core for electromagnetic devices that minimizes the distribution of magnetic flux density, thereby reducing core losses and the required core mass. [Solution] The magnetic core 200 comprises three arc-shaped rims 202. Each rim has a first end and a second end and is arranged around a central axis. The first ends of the rims are connected to each other at a first position along the central axis, and the second ends of the rims are connected to each other at a second position along the central axis. Each rim comprises a plurality of bent electromagnetic steel strips. [Selection Diagram] Figure 2A

Inventors

• スコービー， アンドリュー ジョン

Assignees

• エノダ リミテッド

Dates

Publication Date

20260507

Application Date

20260206

Priority Date

20211101

Claims (6)

1. A magnetic core (200) suitable for an electromagnetic device, wherein the magnetic core comprises three arc-shaped rims (202), the rims are arranged around a central axis (204), each of the rims has a first end (206) and a second end (208), the first ends of the rims are interconnected at a first position along the central axis, the second ends of the rims are interconnected at a second position along the central axis, and each of the rims comprises a plurality of bent electromagnetic steel strips (222, 224, 226, 228, 230, 232, 234, 236, 238, 240, 242, 244), Each of the plurality of bent electrical steel strips comprises a first group of steel strips, a second group of steel strips, and a third group of steel strips, wherein the first group of steel strips is positioned between the second group of steel strips and the third group of steel strips. The first group of steel strips has a first thickness, the second group of steel strips has a second thickness, and the third group of steel strips has a third thickness, wherein the first thickness is greater than both the second and third thicknesses. A magnetic core in which the first group of steel strips has a first width, the second group of steel strips has a second width, and the third group of steel strips has a third width, and the first width is greater than both the second width and the third width.
2. The magnetic core according to claim 1, wherein the rims are arranged at equal intervals around the central axis.
3. The magnetic core according to claim 1 or 2, wherein the second thickness is equal to the third thickness.
4. The magnetic core according to claim 1 or 2, wherein the second width is equal to the third width.
5. The magnetic core according to claim 1 or 2, wherein each rim is arranged to receive its respective primary winding and its respective secondary winding.
6. A magnetic core according to claim 1 or 2, Each primary winding is arranged around each of the rims, An electromagnetic device comprising a secondary winding arranged around each of the aforementioned rims.

Description

[0001] The following disclosure relates to a magnetic core for electromagnetic devices. [0002] Magnetic cores are used in a variety of electromagnetic devices, including transformers, electric motors, generators, and inductors. Transformers have two types of structures: core-type and shell-type. The key difference between these types lies in the arrangement of the core and windings. In core-type transformers, the windings surround the core, while in shell-type transformers, the core surrounds the windings. [0003] In core-type single-phase transformers, the magnetic core is typically in the form of a closed square or rectangular ring made of an electromagnetic steel laminate, with primary and secondary windings surrounding the core with rims on both sides of the ring. However, transformers with primary and secondary coils on separate rims generally exhibit significant magnetic flux leakage, resulting in unsatisfactory voltage regulation and overall unsatisfactory performance. [0004] A toroidal transformer is a core-type single-phase transformer consisting of a donut-shaped core. The primary and secondary windings of a toroidal transformer are typically wound across the entire surface of the core, separated by insulating material. Some of the advantages of toroidal transformers include higher efficiency, inherent shielding from electromagnetic interference, minimal signal distortion, a more compact structure, low mechanical humming, low heat, and small off-load losses. [0030] Further details, aspects, and embodiments of the present invention are described by reference to the drawings, merely as examples. The elements in the drawings are shown for simplicity and clarity and are not necessarily drawn to scale. For ease of understanding, each drawing is given the same reference number. This is a schematic diagram of a conventional three-phase magnetic core. This is a schematic diagram of a magnetic core. Figure 2A is a schematic exploded view of the magnetic core. Figure 2A is a schematic top view of the magnetic core. Figure 2A is a schematic front view of the magnetic core. This table shows the number of layers in the rim of the magnetic core in Figure 2A. This is a schematic diagram of a magnetic core. This is a flowchart of the process for manufacturing the core of a magnetic core. This is a schematic top view of the net for the steel strip to be cut. [0031] Referring to Figures 2A to 2D, the magnetic core 200 comprises three arc-shaped rims 202 arranged at equal intervals around a central axis 204. Each rim 202 is substantially identical. The arc-shaped rims 202 are 180-degree arcs. Each rim has a first end 206 and a second end 208. Each first end 206 has a first edge 210 located along the central axis 204. Each second end 206 has a second edge 212 located along the central axis 204. The first ends 206 are joined to each other, and the second ends 208 are joined to each other. One or more of the following may be wound around each rim 202: a primary winding, a secondary winding, and a regulating winding (not shown). [0032] Each rim 202 comprises multiple electrical steel strips that are stacked and bent together. The use of thin steel stacking reduces power loss caused by eddy currents induced when a sinusoidal voltage is applied to the winding. The cross-section of each rim approximates a circle by varying the width of the steel strips in the rim. The electrical steel strips of each rim 202 are grouped into 15 sets of strips, including a central set of strips 220 and sets of strips 222, 224, 226, 228, 230, 232, 234, 236, 238, 240, 242, and 244. [0033] The sets of steel strips on either side of the central steel strip are paired, and each of the paired sets of steel strips has approximately the same width and thickness. Set 222 of steel strips is paired with set 224 of steel strips, and these are located on either side of the central set 220 of steel strips. Set 226 of steel strips is paired with set 228 of steel strips, and set 226 is located adjacent to set 222 of steel strips, and set 228 is located adjacent to set 224 of steel strips. Set 230 of steel strips is paired with set 232 of steel strips, and set 230 is located adjacent to set 226 of steel strips, and set 232 is located adjacent to set 228 of steel strips. Set 234 of steel strips is paired with set 236 of steel strips, and set 234 is located adjacent to set 230 of steel strips, and set 236 is located adjacent to set 232 of steel strips. Steel strip set 238 is paired with steel strip set 240, and steel strip set 238 is located adjacent to steel strip set 234, and steel strip set 240 is located adjacent to steel strip set 236. Steel strip set 242 is paired with steel strip set 244, and steel strip set 242 is located adjacent to steel strip set 244, and steel strip set 238 is located adjacent to steel strip set 240. [0034] The widths of steel strip sets 222 and 224 are smaller than the width of the central steel strip set 220. The widths of steel s