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Reactor and method of evaluating same

A reactor and coil technology, applied in the direction of inductors, fixed inductors, transformer/inductor magnetic cores, etc., can solve the problems of magnetic core hysteresis loss and other problems

Inactive Publication Date: 2013-11-20
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] That is, the reactor DP of the above-mentioned conventional art suppresses the eddy current loss of the strip conductor 110 generated by the leakage magnetic flux I, but the inventors of the present invention found that, as described above, when the material of the magnetic core is relatively low-grade or the capacity is small, the magnetic core The hysteresis loss also becomes a problem

Method used

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  • Reactor and method of evaluating same
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no. 1 approach

[0064] In this embodiment, the following embodiments are also the same. As mentioned above, instead of the ideal high-grade electromagnetic steel sheet with high permeability and low hysteresis loss, a powder magnetic core or a ferrite core is used. When cheap low-grade magnetic materials with low permeability and large hysteresis characteristics (loops) are used as the magnetic core, the core geometry can be specified, so as to achieve as much as possible within the wide range of materials of the low-grade magnetic core material. The performance of a low-loss reactor close to the case of using electromagnetic steel sheet. As mentioned earlier, in the reactor loss of low-grade magnetic core materials, the hysteresis loss of the material accounts for the majority. The value of this hysteresis loss is proportional to the magnetic flux density Bc in the magnetic core material. Therefore, in order to specify the above-mentioned magnetic core geometry, the key is to achieve an opti...

no. 2 approach

[0191] Figure 32 It is a perspective view showing a part of the reactor of the second embodiment, which is cut away. The reactor D2 of the second embodiment is the same as the above figure 1 The reactor D1 shown is similar. In the above-mentioned reactor D1, the air-core coil 1 and the magnetic core 2 are basically formed in a cylindrical shape, but it is not limited to this, and may be formed in a quadrangular cylindrical shape (a quadrangular cylindrical shape in cross section) or a hexagonal cylindrical shape (a cross section is A polygonal cylindrical shape (a cylindrical shape with a polygonal cross section) such as a hexagonal cylindrical shape) and an octagonal cylindrical shape (a cylindrical shape with an octagonal cross section). In addition, a combination of one of the air-core coil 1 and the magnetic core 2 in a cylindrical shape and the other in a polygonal cylindrical shape may be adopted. in Figure 32 In the example shown, both the air-core coil 11 and the ma...

no. 3 approach

[0197] Figure 35 It is a front view of the core member 23 in the reactor of the third embodiment viewed from the inside. The magnetic core member 23 is similar to the above-mentioned magnetic core members 3 and 4, and the parts corresponding to the magnetic core member 3 are denoted by the same reference symbols, and the description thereof is omitted. In the core member 23 of this embodiment, grooves 23a and 23b for cooling are provided. The recessed groove 23b is formed in a ring shape surrounding the protrusion 3d, and a plurality of recessed grooves 23a are provided at equal intervals in the circumferential direction, extend radially from the recessed groove 23b to the outer peripheral side, penetrate the cylindrical portion 3a and open to the outside. In addition, a cooling medium such as air or cooling water is alternately supplied to and discharged from the groove 23b. Alternatively, the cooling medium is supplied from a groove 23b provided in one area divided into two...

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Abstract

This reactor is provided with a core provided with projection parts which protrude into the hollow core part of an air core coil. Given that S is the cross-sectional area at or near the leading end of the projection parts, g is the gap length between the projections, µ0 is the magnetic permeability of the gap, L is the target inductance, N is the number of turns, and Bc is the average magnetic flux density at or near the center of the gap when the coil current is I, the ideal number of turns N0, effective gap length ge, and effective (distal end portion of projection) cross-sectional area Se are determined as defined respectively as N0=v(L·g / µ0 / S), ge=µ0·N·I / Bc, and Se=L·ge / µ0 / N2; furthermore, normalized parameters a, ß, ? defined as a=N / N0, ß=ge / g, and ?=Se / S are determined. The air core coil turn number N, projection part leading end cross-sectional area S, projection part height, and projection part base shape are set based on the magnetic permeability of the material of the core and the projection parts such that a / ß<1 or, under the condition that the target inductance L is constant, a·?>1 is satisfied.

Description

Technical field [0001] The present invention relates to a reactor evaluation method for evaluating a reactor and a reactor having an appropriate shape determined by the evaluation method, and more particularly to a reactor in which magnetic cores are arranged at both ends and outer circumference of an air-cored coil in order to increase inductance. Background technique [0002] As a conventional technology, for example, there is a reactor shown in Patent Document 1 of the present inventor. Figure 48 It is a perspective view for explaining the manufacturing method of the reactor DP of this patent document 1. In order to increase the inductance, such as Figure 48 As shown in (A) to (B), the long strip conductor 110 is wound into an air-core coil 101 along its thickness direction, such as Figure 48 As shown in (C) to (D), the air-cored coil 101 is housed in a magnetic core 102 composed of a pair of magnetic core members 103 and 104 to form the reactor DP. The core members 103 and 10...

Claims

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Application Information

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IPC IPC(8): H01F27/24H01F37/00H01F41/00
CPCH01F1/344H01F27/2847H01F37/00H01F41/0246H01F27/255
Inventor 井上宪一财津享司桥本裕志三谷宏幸
Owner KOBE STEEL LTD