CN213069016U - Annular coil structure for magnetic core parameter measurement - Google Patents
Annular coil structure for magnetic core parameter measurement Download PDFInfo
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- CN213069016U CN213069016U CN202020870485.0U CN202020870485U CN213069016U CN 213069016 U CN213069016 U CN 213069016U CN 202020870485 U CN202020870485 U CN 202020870485U CN 213069016 U CN213069016 U CN 213069016U
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Abstract
The utility model relates to a toroidal coil structure for magnetic core parameter measurement, including annular magnetic core and winding, its winding includes the first part around the coiling of the radial cross section of magnetic ring and returns the second part around the round along the magnetic ring circumferencial direction. The utility model provides an external magnetic field and annular inductance coils magnetic field self can be eliminated to the toroidal coil coiling mode and the influence of revealing hollow inductance or magnetic core inductance parameter measurement to guarantee annular magnetic core sample measuring accuracy and reliability. Simultaneously the utility model also provides another kind of technical scheme can eliminate the increase of the parasitic capacitance that leads to because the number of turns increases.
Description
Technical Field
The utility model relates to a magnetic core parameter measurement technical field, especially a toroidal coil structure for magnetic core parameter measurement.
Background
The magnetic core parameter measurement generally adopts an annular magnetic core coil sample, and comprises a single coil method and a double coil method. Non-ferromagnetic materials containing no ferromagnetic component have a relative permeability of 0, which is almost the same as that of vacuum, and a magnetic dielectric loss of almost zero, and a coil wound by using such non-ferromagnetic materials as a magnetic core is referred to as an air-core coil for short. Therefore, the loss measured by adopting the single coil method is only the loss of the winding conductor, the loss of the winding conductor has linear characteristics (the temperature is set to be constant), and the magnetic permeability measured can be similar to the vacuum magnetic permeability; and the magnetic core loss measured by adopting the double-winding method is zero, and the magnetic core magnetic conductivity measured is vacuum magnetic conductivity. Therefore, the annular hollow inductor can be used for verifying and calibrating the magnetic core loss and permeability measurement.
However, the annular hollow coil with the current structure has leakage of a high-frequency magnetic field, so that an eddy current effect of an external adjacent metal conductor is caused, and an additional loss error is brought. Meanwhile, an external electromagnetic field can induce voltage on the coil through magnetic coupling, so that a measurement result is interfered, and the precision of the hollow inductor as a calibration and calibration standard is influenced. The same problem exists for toroidal core coil test samples with a magnetic core.
The existing hollow inductance structure adopts an annular non-magnetic-conductive material with a rectangular cross section as a magnetic core, and a winding is tightly attached to the magnetic core and uniformly and densely wound by one layer, as shown in fig. 1. The inductance value of the inductor is calculated by using the formula (1):
wherein L is inductance value of the air core inductor, mu0Is the air permeability, N is the number of turns of the air core inductor, AeIs the effective cross-sectional area of the hollow inductance core, /)eIs the effective magnetic path length of the air-core inductor core.
If the external magnetic field is parallel to the toroid of the core, as shown in FIG. 2. An induced voltage is generated between the upper and lower wires, and no voltage difference is generated between the upper and lower wires. Therefore, the external magnetic field of the parallel magnetic core can not influence the air core inductance. If the external magnetic field is perpendicular to the toroid of the core, as shown in FIG. 3. The magnetic field strength is directed inward of the core (into the paper). Because the winding forms an equivalent loop which surrounds the ring circumference of the annular magnetic core while being wound along the radial section of the ring, the magnetic field induces voltage on the ring according to the electromagnetic induction theorem, and the measurement result is influenced.
The magnetic conductivity of the hollow inductor is air magnetic conductivity mu0And the sparseness of the windings causes the air core inductor to generate near magnetic field leakage, as shown in fig. 4. The higher the winding compactness, the smaller the range of influence of magnetic field leakage in the part. At the same time, since the winding has a circle of equivalent loops around the circumference of the circular ring, the loops also generate magnetic field leakage, as shown in fig. 5. Although the loop generally has only one turn (if the winding is wound in multiple layers, it is equivalent to multiple turns), the area is large, and therefore the magnetic field leakage range is large. The magnetic field near-field leakage not only enables nearby metal objects to generate an eddy current effect to influence the magnetic characteristics of the hollow inductor to be measured, but also enables the characteristics of the hollow inductor to be difficult to accurately control.
Therefore, the leakage of the external magnetic field and the magnetic field of the annular inductance coil can affect the parameter measurement of the hollow inductance or the magnetic core inductance, and further affect the measurement accuracy.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a toroidal coil structure for magnetic core parameter measurement, which can reduce the additional loss of the sample itself exciting magnetic field to the external adjacent conductor and the measurement error caused by the external magnetic field interference, so as to ensure the accuracy and reliability of the toroidal magnetic core sample measurement.
The utility model discloses a following scheme realizes:
the utility model provides a pair of a toroidal coil structure for magnetic core parameter measurement, including annular magnetic core and winding, its winding includes and returns the second part around the round around the first part of magnetic ring radial cross section coiling and along the magnetic ring circumferencial direction.
Further, the magnetic core is made of non-ferromagnetic material, magnetic powder core or hollow core without ferromagnetic component.
Furthermore, a single wire or a plurality of parallel wire groups are adopted for the second part which is wound back for one circle along the circumferential direction of the magnetic ring; the plurality of parallel lead groups are uniformly distributed on the inner diameter, the outer diameter, the upper surface and the lower surface of the magnetic ring.
Furthermore, a second part which is wound back for one circle along the circumferential direction of the magnetic ring adopts a single circle of copper foil or a plurality of circles of parallel copper foil groups; the multiple circles of parallel copper foil groups are uniformly distributed on the inner diameter, the outer diameter, the upper surface and the lower surface of the magnetic ring.
The first toroidal coil sample for magnetic core parameter measurement can effectively eliminate the magnetic field leakage of the sample and the influence of an external magnetic field on the sample.
The utility model provides a second is used for annular coil structure of magnetic core parameter measurement, including annular magnetic core and winding, its winding includes the first part around the positive coiling of magnetic ring radial cross section and the second part around the reverse coiling of magnetic ring radial cross section; the number of turns of the first portion is equal to that of the second portion.
Further, the magnetic core is made of non-ferromagnetic material, magnetic powder core or hollow core without ferromagnetic component.
The second toroidal coil sample for magnetic core parameter measurement can effectively eliminate the magnetic field leakage of the sample and the influence of an external magnetic field on the sample.
The utility model provides a third kind is used for magnetic core parameter measurement's toroidal coil structure, including annular magnetic core, winding and the round short circuit circle that sets up along the outer circumference of magnetic ring.
Further, the shorting turn may be grounded to the input terminal of the toroidal coil.
With the third toroidal coil for magnetic core parameter measurement, parasitic capacitance can be eliminated.
The utility model provides a fourth kind is used for magnetic core parameter measurement's toroidal coil structure, including annular magnetic core and winding, its winding includes the first part around the coiling of the radial cross section of magnetic ring and returns the second part around the round along the magnetic ring circumferencial direction to still include the round short circuit circle that sets up along the outer circumference of magnetic ring.
Further, the magnetic core is made of non-ferromagnetic material, magnetic powder core or hollow core without ferromagnetic component.
Furthermore, a single wire or a plurality of parallel wire groups are adopted for the second part which is wound back for one circle along the circumferential direction of the magnetic ring; the plurality of parallel lead groups are uniformly distributed on the inner diameter, the outer diameter, the upper surface and the lower surface of the magnetic ring.
Furthermore, a second part which is wound back for one circle along the circumferential direction of the magnetic ring adopts a single circle of copper foil or a plurality of circles of parallel copper foil groups; the multiple circles of parallel copper foil groups are uniformly distributed on the inner diameter, the outer diameter, the upper surface and the lower surface of the magnetic ring.
Further, the shorting turn may be grounded to the input terminal of the toroidal coil.
The utility model provides a fifth annular coil structure for magnetic core parameter measurement, including annular magnetic core and winding, its winding includes the first part around the positive coiling of magnetic ring radial cross section and the second part around the reverse coiling of magnetic ring radial cross section; the first part and the second part have the same number of turns, and the magnetic ring further comprises a circle of short-circuit turns arranged along the outer circumference of the magnetic ring.
Further, the magnetic core is made of non-ferromagnetic material, magnetic powder core or hollow core without ferromagnetic component.
Further, the shorting turn may be grounded to the input terminal of the toroidal coil.
By adopting the fourth and fifth toroidal coils for magnetic core parameter measurement, the increase of parasitic capacitance caused by the increase of turns can be further reduced on the basis of reducing self magnetic leakage.
Compared with the prior art, the utility model discloses there is following beneficial effect: the utility model provides an external magnetic field and annular inductance coils magnetic field self can be eliminated to the toroidal coil coiling mode and the influence of revealing hollow inductance or magnetic core inductance parameter measurement to guarantee annular magnetic core sample measuring accuracy and reliability. Simultaneously the utility model also provides another kind of technical scheme can eliminate the increase of the parasitic capacitance that leads to because the number of turns increases.
Drawings
Fig. 1 is a schematic diagram of a winding structure of an air-core inductor in the prior art.
Fig. 2 is a schematic diagram showing the influence of the external magnetic field of the parallel magnetic core on the air core inductance.
Fig. 3 is a schematic diagram illustrating the influence of the external magnetic field of the vertical magnetic core on the air core inductance.
Fig. 4 is a diagram illustrating near field leakage of a hollow inductor in the prior art.
Fig. 5 is a schematic diagram of near-field leakage of equivalent loop current of an air-core inductor around the circumference of a circular ring in the prior art.
Fig. 6 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 7 is a schematic diagram of a first embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a second embodiment of the present invention.
Fig. 9 is a schematic diagram of a second embodiment of the present invention.
Fig. 10 is a schematic structural diagram of a third embodiment of the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings and the embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The first embodiment.
As shown in fig. 6, the present embodiment provides a toroidal coil structure for magnetic core parameter measurement, which includes a toroidal magnetic core and a winding, where the winding includes a first portion wound around a radial cross section of a magnetic ring and a second portion wound by one turn along a circumferential direction of the magnetic ring.
In this embodiment, the magnetic core is a non-ferromagnetic material, a magnetic powder core, or a hollow core that does not contain a ferromagnetic component. Wherein, when the magnetic core is made of non-ferromagnetic material without ferromagnetic component or is hollow, the toroidal coil is an air core inductor.
In the embodiment, a single wire or a plurality of parallel wire groups are adopted for the second part which is wound back for one circle along the circumferential direction of the magnetic ring; the plurality of parallel lead groups are uniformly distributed on the inner diameter, the outer diameter, the upper surface and the lower surface of the magnetic ring.
In the embodiment, a single circle of copper foil or a plurality of circles of parallel copper foil groups are adopted for the second part which is wound back for one circle along the circumferential direction of the magnetic ring; the multiple circles of parallel copper foil groups are uniformly distributed on the inner diameter, the outer diameter, the upper surface and the lower surface of the magnetic ring.
By adopting the toroidal coil sample for magnetic core parameter measurement of the embodiment, the magnetic field leakage of the sample and the influence of an external magnetic field on the sample can be effectively eliminated.
The principle analysis is as follows:
the toroidal air core inductor with current flowing through it is schematically shown in fig. 7 (a), and the current i on each turn of winding can be divided into radial current components iRAnd a tangential current component iHOne of the turns of the winding current is amplified as shown in (b) of fig. 7. The sum of the tangential current components of each turn constitutes a clockwise or counterclockwise current (the reference direction for the sum of the tangential current components in fig. 7 is counterclockwise) around the circumference of the magnetic core, and this current turn will cause leakage of the magnetic field. That is, the winding current of the actually wound toroidal inductor can be divided into two parts, namely, each turn in the radial direction of the winding and one turn in the circumference of the winding. After the hollow inductance winding is fully wound by one layer, the hollow inductance winding is wound by one circle along the magnetic coreThe flow reference direction is exactly opposite to the tangential current component circular current reference direction, and the two directions cancel each other. Therefore, the air core inductor structure wound by one turn can effectively reduce the near field leakage of the air core inductor. In addition, it can be proved that, as long as the winding is uniformly and densely wound, the total induced electromotive force of the external magnetic field on each radial turn is zero, and the induced electromotive force on the turn around the ring is offset with the induced electromotive force of the turn around the ring, so that the interference of the external magnetic field on the annular inductance coil is eliminated.
For the test sample by the double winding method, the same treatment is carried out after the two windings are wound in parallel.
Example two.
As shown in fig. 8, the toroidal coil structure for magnetic core parameter measurement provided in this embodiment includes a toroidal magnetic core and a winding, where the winding includes a first portion wound around a radial cross section of a magnetic ring in a forward direction and a second portion wound around the radial cross section of the magnetic ring in a reverse direction; the number of turns of the first portion is equal to that of the second portion.
In the present embodiment, the magnetic core is a non-ferromagnetic material, a magnetic powder core, or a hollow core that does not contain a ferromagnetic component. Wherein, when the magnetic core is made of non-ferromagnetic material without ferromagnetic component or is hollow, the toroidal coil is an air core inductor.
By adopting the toroidal coil sample for magnetic core parameter measurement of the embodiment, the magnetic field leakage of the sample and the influence of an external magnetic field on the sample can be effectively eliminated.
The principle is as follows:
the structure of the air core inductor wound with a layer in the reverse direction of current flow is shown in fig. 9, and the structure diagram of the forward one turn and the reverse one turn inside the dashed line box in (a) of fig. 9 is enlarged as shown in (b) of fig. 9. The forward one-turn current i can be divided into radial current components iR1And a tangential current component iH1And a reverse one-turn current i can also be divided into radial current components iR2And a tangential current component iH2. Tangential current component i of main current source of air core inductor near field leakageH1And iH2The opposite directions are close in magnitude, which cancel each other out. Therefore, the air core inductor structure wound by one layer in the opposite direction can effectively reduce the near field leakage of the annular air core inductor。
Example three.
Since the number of winding turns is increased in the above embodiment, which results in an increase in parasitic capacitance, in order to eliminate the parasitic capacitance, the embodiment provides a toroidal coil structure for magnetic core parameter measurement, as shown in fig. 10, including a toroidal magnetic core, a winding, and a ring of short-circuit turns arranged along the outer circumference of the magnetic ring.
In this embodiment, the shorting turn may be grounded to the input terminal of the toroid.
Since the shorted turns are shorted closed, the closed loop voltage is zero. According to the electromagnetic induction law, the alternating current magnetic flux passing through the closed area is zero, so that the magnetic field leakage of the coil can be effectively eliminated, and meanwhile, the interference of an external magnetic field on the annular sample can be effectively shielded. The short circuit turn can be arranged along the outer ring of the ring by adopting a copper foil with a wider width, and can also be arranged by adopting a short circuit lead (one turn or a plurality of turns), but the copper foil can increase the distributed capacitance of the coil due to larger area, and the short circuit lead has small influence on the distributed capacitance due to small area. In order to further reduce the influence of electric field induction, the short-circuit ring can be connected with the ground of the input end of the inductor.
By adopting the toroidal coil for magnetic core parameter measurement of the embodiment, parasitic capacitance can be eliminated.
Example four.
The toroidal coil structure for magnetic core parameter measurement provided by this implementation is realized based on the first implementation example, and includes a toroidal magnetic core and a winding, where the winding includes a first portion wound around a radial cross section of a magnetic ring and a second portion wound back by one turn in a circumferential direction of the magnetic ring, and further includes a short-circuit turn arranged along an outer circumference of the magnetic ring.
In this embodiment, the magnetic core is a non-ferromagnetic material, a magnetic powder core, or a hollow core that does not contain a ferromagnetic component.
In the embodiment, a single wire or a plurality of parallel wire groups are adopted for the second part which is wound back for one circle along the circumferential direction of the magnetic ring; the plurality of parallel lead groups are uniformly distributed on the inner diameter, the outer diameter, the upper surface and the lower surface of the magnetic ring.
In the embodiment, a single circle of copper foil or a plurality of circles of parallel copper foil groups are adopted for the second part which is wound back for one circle along the circumferential direction of the magnetic ring; the multiple circles of parallel copper foil groups are uniformly distributed on the inner diameter, the outer diameter, the upper surface and the lower surface of the magnetic ring.
In this embodiment, the shorting turn may be grounded to the input terminal of the toroid.
Example five.
The toroidal coil structure for magnetic core parameter measurement provided by the embodiment is realized based on the second embodiment, and comprises a toroidal magnetic core and a winding, wherein the winding comprises a first part wound around the radial section of a magnetic ring in a forward direction and a second part wound around the radial section of the magnetic ring in a reverse direction; the first part and the second part have the same number of turns, and the magnetic ring further comprises a circle of short-circuit turns arranged along the outer circumference of the magnetic ring.
In this embodiment, the magnetic core is a non-ferromagnetic material, a magnetic powder core, or a hollow core that does not contain a ferromagnetic component.
In this embodiment, the shorting turn may be grounded to the input terminal of the toroid.
By adopting the toroidal coils for magnetic core parameter measurement of the fourth embodiment and the fifth embodiment, the increase of parasitic capacitance due to the increase of the number of turns can be further reduced on the basis of reducing the self leakage flux.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (4)
1. A ring-shaped coil structure for measuring magnetic core parameters is characterized by comprising a ring-shaped magnetic core and a winding, wherein the winding comprises a first part wound around the radial section of a magnetic ring and a second part wound back for one circle along the circumferential direction of the magnetic ring;
wherein the magnetic core is made of non-ferromagnetic material, magnetic powder core or hollow core without ferromagnetic component.
2. A toroidal coil construction for parametric measurement of magnetic cores as claimed in claim 1, wherein a single conductor or a plurality of parallel conductor sets are used for the second part of the turn in the circumferential direction of the magnetic loop; the plurality of parallel lead groups are uniformly distributed on the inner diameter, the outer diameter, the upper surface and the lower surface of the magnetic ring.
3. The toroidal coil structure for magnetic core parameter measurement as claimed in claim 1, wherein the second portion of one turn in the circumferential direction of the magnetic ring is made of a single copper foil or a plurality of parallel copper foil groups; the multiple circles of parallel copper foil groups are uniformly distributed on the inner diameter, the outer diameter, the upper surface and the lower surface of the magnetic ring.
4. A toroidal coil structure for magnetic core parameter measurement as claimed in any of claims 1 to 3, further comprising a ring of short-circuited turns arranged along the outer circumference of the magnetic ring.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020870485.0U CN213069016U (en) | 2020-05-22 | 2020-05-22 | Annular coil structure for magnetic core parameter measurement |
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| CN202020870485.0U CN213069016U (en) | 2020-05-22 | 2020-05-22 | Annular coil structure for magnetic core parameter measurement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111458571A (en) * | 2020-05-22 | 2020-07-28 | 福州大学 | Toroidal coil for magnetic core parameter measurement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111458571A (en) * | 2020-05-22 | 2020-07-28 | 福州大学 | Toroidal coil for magnetic core parameter measurement |
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Granted publication date: 20210427 |