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Annular coil for magnetic core parameter measurement

A toroidal coil and parameter measurement technology, applied in measurement devices, measurement of electrical variables, and dielectric properties measurement, etc., can solve the problems affecting measurement accuracy, measurement influence, and influence on magnetic properties of air-core inductance, and eliminate the increase of parasitic capacitance. , to ensure the effect of accuracy and reliability

Pending Publication Date: 2020-07-28
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The near-field leakage of the magnetic field not only causes the eddy current effect of nearby metal objects to affect the magnetic characteristics of the air-core inductor in the measurement, but also makes it difficult to accurately control the characteristics of the air-core inductor itself
[0009] Therefore, the leakage of the external magnetic field and the magnetic field of the ring inductor coil will affect the parameter measurement of the air core inductor or magnetic core inductor, and then affect the accuracy of the measurement

Method used

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  • Annular coil for magnetic core parameter measurement
  • Annular coil for magnetic core parameter measurement
  • Annular coil for magnetic core parameter measurement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] like Image 6 As shown, this embodiment provides a toroidal coil for magnetic core parameter measurement, including a toroidal magnetic core and a winding, and the winding includes a first part wound around the radial section of the magnetic ring and rewinding along the circumferential direction of the magnetic ring The second part of the lap.

[0048] In this embodiment, the magnetic core is made of non-ferromagnetic material without ferromagnetic components, magnetic powder core or hollow core. Wherein, when the magnetic core is a non-ferromagnetic material without ferromagnetic components or is hollow, the loop coil is an air-core inductor.

[0049]In this embodiment, a single wire or a plurality of parallel wire groups are used for the second part that goes back one circle along the circumferential direction of the magnetic ring; surface and subsurface.

[0050] In this embodiment, the second part of one turn along the circumferential direction of the magnetic ri...

Embodiment 2

[0056] like Figure 8 As shown, the toroidal coil for magnetic core parameter measurement provided by this embodiment includes a toroidal magnetic core and a winding, and the winding includes a first part that is wound forward around the radial section of the magnetic ring and reversely wound around the radial section of the magnetic ring. The second part of the winding; the first part has the same number of turns as the second part.

[0057] In this implementation, the magnetic core is made of non-ferromagnetic material without ferromagnetic components, magnetic powder core or hollow core. Wherein, when the magnetic core is a non-ferromagnetic material without ferromagnetic components or is hollow, the loop coil is an air-core inductor.

[0058] Using the loop coil sample for magnetic core parameter measurement of this embodiment can effectively eliminate the magnetic field leakage of the sample itself and the influence of the external magnetic field on the sample.

[0059]...

Embodiment 3

[0062] Since the number of winding turns in the above embodiment is increased, the parasitic capacitance increases. In order to eliminate the parasitic capacitance, this embodiment provides a toroidal coil for magnetic core parameter measurement, such as Figure 10 As shown, it includes a ring magnetic core, a winding and a short-circuited turn arranged along the outer circumference of the magnetic ring.

[0063] In this embodiment, the short-circuited turn can be connected to the ground of the input end of the toroidal coil.

[0064] Since the short-circuited turns are short-circuit closed, the closed-circuit voltage is zero. According to the law of electromagnetic induction, the AC magnetic flux passing through the closed area is zero, so the magnetic field leakage of the coil itself can be effectively eliminated, and the interference of the external magnetic field to the ring sample can also be effectively shielded. The short-circuited turn can be arranged along the outer ...

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Abstract

The invention relates to a toroidal coil for magnetic core parameter measurement, which comprises a toroidal magnetic core and a winding, and the winding comprises a first part wound around the radialcross section of a magnetic ring and a second part wound back for a circle along the circumferential direction of the magnetic ring. The annular coil winding mode provided by the invention can eliminate the influence of self leakage of an external magnetic field and an annular inductance coil magnetic field on hollow inductance or magnetic core inductance parameter measurement, thereby ensuring the accuracy and reliability of annular magnetic core sample measurement. Meanwhile, the invention also provides another technical scheme which can eliminate the increase of parasitic capacitance caused by the increase of the number of turns.

Description

technical field [0001] The invention relates to the technical field of magnetic core parameter measurement, in particular to a ring coil for magnetic core parameter measurement. Background technique [0002] The core parameter measurement generally adopts the toroidal core coil sample, and there are single-coil method and double-coil method. Non-ferromagnetic materials that do not contain ferromagnetic components have almost the same relative permeability as vacuum and almost zero magnetic medium loss. Coils wound using such non-ferromagnetic materials as magnetic cores are referred to as air-core coils. Therefore, the loss measured by the single-coil method is only the loss of the winding conductor, and the loss of the winding conductor has a linear characteristic (assuming a constant temperature), and the measured magnetic permeability can be approximated as the vacuum magnetic permeability; while the measured magnetic permeability obtained by the double-winding method is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26G01R31/72H01F27/28H01F27/30H01F27/34
CPCG01R27/26G01R27/2694H01F27/2895H01F27/306H01F27/346
Inventor 汪晶慧陈为
Owner FUZHOU UNIV