CN113534023B - Nondestructive testing method and device for non-annular magnetic core - Google Patents
Nondestructive testing method and device for non-annular magnetic core Download PDFInfo
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- CN113534023B CN113534023B CN202110697851.6A CN202110697851A CN113534023B CN 113534023 B CN113534023 B CN 113534023B CN 202110697851 A CN202110697851 A CN 202110697851A CN 113534023 B CN113534023 B CN 113534023B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
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Abstract
The specification relates to the technical field of magnetic materials, in particular to a nondestructive testing method and device for a non-annular magnetic core. The method comprises the following steps: acquiring set magnetic performance and set size of a magnetic core to be detected; selecting a U-shaped detection device with a first magnetic property and a first structure according to the set magnetic property and the set size; the magnetic core to be detected is carried to the U-shaped detection device through the two column parts, and the relative positions of the magnetic core to be detected and the two column parts are adjusted, so that the contact area between each column part of the two column parts and the magnetic core to be detected is larger than the effective sectional area of the magnetic core to be detected; winding a first wire on a first part to be detected, and connecting two ends of the first wire to corresponding ports of a magnetic performance detector respectively, so that the magnetic performance detector can detect the magnetic performance of the magnetic core to be detected.
Description
Technical Field
The specification relates to the technical field of magnetic materials, in particular to a nondestructive testing method and device for a non-annular magnetic core.
Background
The magnetic core is an important magnetic core device, has wide application, and is an important component part of various electronic equipment. The performance of the magnetic core directly or indirectly affects the functionality of the electronic device. Therefore, the magnetic properties of the core need to be detected before the core is put into use.
For detecting the magnetic performance of the magnetic core, a complete magnetic loop is required to be formed. For conventional toroidal cores, they already constitute a complete closed magnetic circuit. Therefore, the magnetic core can be directly wound, and the detection can be directly carried out through a detection instrument. However, the magnetic core has various shapes due to various application fields of the magnetic core. Besides toroidal cores, there are also non-toroidal cores such as block-shaped ones. The non-toroidal core itself is not a closed magnetic loop and is difficult to directly wind on to detect.
Currently, in order to detect the magnetic performance of a non-annular magnetic core, the non-annular magnetic core needs to be engraved into an annular magnetic core, and then the magnetic performance of the annular magnetic core needs to be detected. The scheme is complex in operation and long in time consumption. In the mass production of actual products, only a small number of samples can be subjected to spot inspection to statistically detect a large number of magnetic cores, so that the consistency of magnetic properties of the mass products is easy to have errors.
Disclosure of Invention
The embodiment of the specification provides a nondestructive testing method and device for a non-annular magnetic core, which can perform nondestructive testing on the non-annular magnetic core, so that coverage detection on a large number of magnetic cores can be realized.
In a first aspect, embodiments of the present disclosure provide a non-toroidal core nondestructive testing method, including the steps of:
Acquiring set magnetic performance and set size of a magnetic core to be detected, wherein the shape of the magnetic core to be detected is non-annular;
Selecting a U-shaped detection device with a first magnetic property and a first structure according to the set magnetic property and the set size; wherein the first magnetic property is higher than the set magnetic property; the first structure is such that when the magnetic core to be detected is mounted on the U-shaped detection device through two column portions of the U-shaped detection device, a contact area between the magnetic core to be detected and each of the two column portions is larger than an effective cross-sectional area of the magnetic core to be detected, and the first structure is such that a cross-sectional area of any one of the two column portions is larger than an effective cross-sectional area of the magnetic core to be detected, and a cross-sectional area of any one of yoke portions of the U-shaped detection device is larger than an effective cross-sectional area of the magnetic core to be detected, the yoke portions being portions of the U-shaped detection device between the two column portions;
The magnetic core to be detected is carried to the U-shaped detection device through the two column parts, and the relative positions of the magnetic core to be detected and the two column parts are adjusted, so that the contact area between each column part of the two column parts and the magnetic core to be detected is larger than the effective sectional area of the magnetic core to be detected;
winding a first wire on a first part to be detected, and connecting two ends of the first wire to corresponding ports of a magnetic performance detector respectively, so that the magnetic performance detector can detect the magnetic performance of the magnetic core to be detected.
The U-shaped detection device is made of a magnetic core material with high magnetic permeability and low loss, so that the U-shaped detection device can be used as a magnetic short circuit component in the detection process of a magnetic core to be detected. In some embodiments, the U-shaped detection device may be made of ferrite or nanocrystalline materials. In one example of these embodiments, the U-shaped detection means may be constituted by a soft magnetic ferrite. In one example of this example, the U-shaped detection device may be specifically composed of manganese zinc ferrite. In some embodiments, the core to be tested is embodied as a strip core. In some embodiments, the U-shaped detection device is used for detecting magnetic properties such as magnetic permeability, loss and the like of the magnetic core to be detected.
In the scheme provided by the embodiment of the specification, the U-shaped detection device is combined with a non-conventional annular magnetic core, especially a strip-shaped magnetic core to form a closed magnetic loop, and the U-shaped detection device is used as a magnetic short circuit part, wherein the magnetic permeability and the sectional area of the U-shaped detection device are larger than the indexes of the magnetic core, so that the loss of the magnetic short circuit part can be ignored compared with the magnetic core, and the purpose of testing the magnetic properties such as the loss, the magnetic permeability and the like of the magnetic core is achieved.
In some embodiments, the first part to be detected is a part of the magnetic core to be detected between the two column parts, or the first part to be detected is a yoke part of the U-shaped detection device.
In some embodiments, a first space is arranged between the end face of a first column part of the two column parts and a first part, the thickness of the first space is 0.01-2 mm, and the first part is a part of the magnetic core to be detected, which is opposite to the end face of the first column part; the first gap is an air gap or a sheet insulator.
Through setting up first interval for the whole magnetic circuit of magnetic circuit is more even, has improved the degree of accuracy of testing result.
In some embodiments, an end face of a first pillar portion of the two pillar portions is provided with a first groove for accommodating a first part, and the first part is a part of the magnetic core to be detected, which is opposite to the end face of the first pillar portion; the depth of the first groove is not larger than the height of the first part, wherein the height direction of the first part is perpendicular to the end face of the first column part; the gap between the part of the first part, which is placed in the first groove, and the inner side edge of the first groove is smaller than 0.2mm.
Through setting up the recess, when detecting the magnetic property of magnetic core, be convenient for place the magnetic core on the U type detection device.
In some embodiments, the first magnetic property and the set magnetic property are magnetic permeability, and the first magnetic property is greater than 50 times the set magnetic property.
In a second aspect, embodiments of the present disclosure provide a non-toroidal core nondestructive testing method, including the steps of:
Acquiring set magnetic performance and set size of a magnetic core to be detected, wherein the shape of the magnetic core to be detected is non-annular;
Selecting a detection device with first magnetic property according to the set magnetic property and the set size, wherein the detection device comprises a first U-shaped detection component and a second U-shaped detection component which are arranged in a split manner; the first U-shaped detection device is provided with a first column part and a second column part, and the second U-shaped detection device is provided with a third column part and a fourth column part; wherein, in a use state of the detection device, the first column part and the third column part are arranged oppositely, and the second column part and the fourth column part are arranged oppositely;
Placing the magnetic core to be detected between the first U-shaped detection component and the second U-shaped detection component, wherein a first part of the magnetic core to be detected is positioned between the first column part and the third column part, a second part of the magnetic core to be detected is positioned between the second column part and the fourth column part, and the first part and the second part are opposite two ends in the magnetic core to be detected; wherein the sum of the contact area between the first part and the first column part plus the contact area between the first part and the third column part is larger than the effective sectional area of the magnetic core to be detected, and the sum of the contact area between the second part and the second column part plus the contact area between the second part and the fourth column part is larger than the effective contact area of the magnetic core to be detected;
Winding a first wire on a first part to be detected, and respectively connecting two ends of the first wire to corresponding ports of a magnetic performance detector so that the magnetic performance detector can detect the magnetic performance of the magnetic core to be detected; wherein,
The first part to be detected is a part of the magnetic core to be detected, which is positioned between the first column part and the third column part.
The first U-shaped detection part and the second U-shaped detection part are made of magnetic core materials with high magnetic permeability and low loss, so that the first U-shaped detection part and the second U-shaped detection part can be used as magnetic short circuit parts in the detection process of the magnetic core to be detected. In some embodiments, the first U-shaped detection member and the second U-shaped detection member may be made of ferrite or nanocrystalline materials. In one example of these embodiments, the first U-shaped detection member and the second U-shaped detection member may be composed of soft magnetic ferrite. In one example of this example, the first U-shaped detection member and the second U-shaped detection member may be specifically composed of manganese zinc ferrite. In some embodiments, the core to be tested is embodied as a strip core. In some embodiments, the U-shaped detection device is used for detecting magnetic properties such as magnetic permeability, loss and the like of the magnetic core to be detected.
In some embodiments, the magnetic performance detector may be a B-H tester (SY-8218/SY-8219), a DC stack test bench (SY-961/SY-960), a wide temperature range oven scanning system (SY-330), and so forth.
In the scheme provided by the embodiment of the specification, the detection device is combined with the unconventional annular magnetic core, especially the strip-shaped magnetic core to form a closed magnetic loop, and the magnetic conductivity and the cross section area of the detection device are larger than the indexes of the magnetic core as the magnetic short circuit part, so that the loss of the magnetic short circuit part is negligible compared with the magnetic core, and the purpose of testing the magnetic properties such as the loss, the magnetic conductivity and the like of the magnetic core is achieved. And moreover, by adopting two U-shaped detection parts, the image of the magnetic path length difference on the magnetic core is reduced, so that the magnetic path uniformity in a magnetic loop is higher, and the error of a detection result is smaller.
In some embodiments, the first post and the first section have a first spacing therebetween; and/or, the third pillar portion and the first portion have a first space therebetween; and/or, a first interval is arranged between the second column part and the second part; and/or, the fourth pillar portion and the second portion have a first spacing therebetween; the first interval is an air gap or a sheet insulator, and the thickness of the first interval is 0.01-2 mm.
In some embodiments, an end face of the first post is provided with a first recess for receiving the first part; the depth of the first groove is not larger than the height of the first part, wherein the height direction of the first part is perpendicular to the end face of the first column part; the gap between the part of the first part which is arranged in the first groove and the inner side edge of the first groove is smaller than 0.2mm; and/or the end face of the second column part is provided with a second groove for accommodating the second part; the depth of the second groove is not larger than the height of the second part, wherein the height direction of the second part is perpendicular to the end face of the second column part; the gap between the part of the second part which is arranged in the second groove and the inner side edge of the second groove is smaller than 0.2mm; and/or the end face of the third column part is provided with a third groove for accommodating the first part; the depth of the third groove is not larger than the height of the first part, wherein the height direction of the first part is perpendicular to the end face of the third column part; the gap between the part of the first part, which is placed in the third groove, and the inner side edge of the first groove is smaller than 0.2mm; and/or the end face of the fourth column part is provided with a fourth groove for accommodating the second part; the depth of the fourth groove is not larger than the height of the second part, wherein the height direction of the second part is perpendicular to the end face of the fourth column part; the gap between the part of the second part placed in the fourth groove and the inner side edge of the fourth groove is smaller than 0.2mm.
In some embodiments, the first magnetic property and the set magnetic property are magnetic permeability, and the first magnetic property is greater than 50 times the set magnetic property.
In a third aspect, embodiments of the present disclosure provide a magnetic core detection apparatus for non-destructive testing of magnetic properties of a non-toroidal magnetic core, where the magnetic core detection apparatus is a first magnetic property U-shaped detection apparatus, and the first magnetic property is higher than a set magnetic property of the non-toroidal magnetic core;
The U-shaped detection device comprises: two column parts and a yoke part between the two column parts; wherein a cross-sectional area of any one of the two leg portions and a cross-sectional area of any one of the yoke portions are larger than an effective cross-sectional area of the non-toroidal core;
the two leg portions are used for carrying the non-annular magnetic core, and when the two leg portions carry the non-annular magnetic core, the contact area between the non-annular magnetic core and each of the two leg portions is larger than the effective sectional area of the non-annular magnetic core.
In some embodiments, an end face of a first of the two posts is provided with a sheet insulator having a thickness of 0.01mm-2mm.
In some embodiments, an end face of a first pillar portion of the two pillar portions is provided with a first groove for accommodating a first portion, the first portion being a portion of the non-annular magnetic core opposite to the end face of the first pillar portion when the two pillar portions carry the non-annular magnetic core;
The depth of the first groove is not larger than the height of the first part, wherein the height direction of the first part is perpendicular to the end face of the first column part;
When the two column parts carry the non-annular magnetic core, the gap between the part of the first part which is arranged in the first groove and the inner side edge of the first groove is smaller than 0.2mm.
In some embodiments, the first magnetic property and the set magnetic property are magnetic permeability, and the first magnetic property is greater than 50 times the set magnetic property.
In a fourth aspect, embodiments of the present disclosure provide a magnetic core detection apparatus for non-destructive testing of magnetic properties of a non-toroidal magnetic core, where the magnetic core detection apparatus is a first magnetic property U-shaped detection apparatus, and the first magnetic property is higher than a set magnetic property of the non-toroidal magnetic core;
The detection device comprises a first U-shaped detection component and a second U-shaped detection component which are arranged in a split mode; the first U-shaped detection device is provided with a first column part and a second column part, and the second U-shaped detection device is provided with a third column part and a fourth column part; wherein,
In the use state of the detection device, the first column part and the third column part are arranged oppositely, and the second column part and the fourth column part are arranged oppositely; a first part of the non-annular magnetic core is positioned between the first column part and the third column part, a second part of the non-annular magnetic core is positioned between the second column part and the fourth column part, and the first part and the second part are two opposite ends in the non-annular magnetic core; wherein the sum of the contact area between the first part and the first column part plus the contact area between the first part and the third column part is larger than the effective cross-sectional area of the non-annular magnetic core, and the sum of the contact area between the second part and the second column part plus the contact area between the second part and the fourth column part is larger than the effective contact area of the non-annular magnetic core.
In some embodiments, an end face of the first pillar portion is provided with a sheet insulator; and/or, the end face of the second column part is provided with a sheet insulator; and/or the end face of the third column part is provided with a sheet insulator; and/or, the end face of the fourth column part is provided with a sheet insulator; wherein the thickness of the sheet insulator is 0.01mm-2mm.
In some embodiments, an end face of the first post is provided with a first recess for receiving the first part; the depth of the first groove is not larger than the height of the first part, wherein the height direction of the first part is perpendicular to the end face of the first column part; the gap between the part of the first part which is arranged in the first groove and the inner side edge of the first groove is smaller than 0.2mm; and/or the number of the groups of groups,
The end face of the second column part is provided with a second groove for accommodating the second part; the depth of the second groove is not larger than the height of the second part, wherein the height direction of the second part is perpendicular to the end face of the second column part; the gap between the part of the second part which is arranged in the second groove and the inner side edge of the second groove is smaller than 0.2mm; and/or the number of the groups of groups,
The end face of the third column part is provided with a third groove for accommodating the first part; the depth of the third groove is not larger than the height of the first part, wherein the height direction of the first part is perpendicular to the end face of the third column part; the gap between the part of the first part, which is placed in the third groove, and the inner side edge of the first groove is smaller than 0.2mm; and/or the number of the groups of groups,
The end face of the fourth column part is provided with a fourth groove for accommodating the second part; the depth of the fourth groove is not larger than the height of the second part, wherein the height direction of the second part is perpendicular to the end face of the fourth column part; the gap between the part of the second part placed in the fourth groove and the inner side edge of the fourth groove is smaller than 0.2mm.
In some embodiments, the first magnetic property and the set magnetic property are magnetic permeability, and the first magnetic property is greater than 50 times the set magnetic property.
Through the non-annular magnetic core nondestructive testing method and device provided by the embodiment of the specification, the magnetic core to be detected can be used for detection by being placed on the detection device, the method and device are suitable for rapid continuous testing of the non-annular magnetic core, and the magnetic core is not required to be engraved, so that the magnetic core can be detected on a large scale.
Drawings
Fig. 1 shows the contact area of a core to be tested with a test device;
FIG. 2 shows the effective cross-sectional area of a magnetic core to be inspected;
FIG. 3 shows a cross-sectional area of a column portion and a cross-sectional area of a yoke portion of the detection device;
FIG. 4A shows a schematic diagram of a core wire to be tested;
FIG. 4B shows a magnetic circuit simulation of a core winding to be inspected;
fig. 4C shows a magnetic circuit simulation of a winding on a core to be inspected with a space between the inspection device and the core to be inspected;
FIG. 5A shows a schematic diagram of a test device yoke wire;
FIG. 5B shows a magnetic circuit simulation of a yoke winding of the detection device;
FIG. 6A shows an assembled schematic diagram of the use of a dual U-shaped detection device to detect magnetic properties of a magnetic core;
FIG. 6B shows an exploded view of detecting magnetic properties of a magnetic core using a dual U-shaped detection device;
Fig. 7 shows a magnetic circuit simulation of detecting the performance of a magnetic core using a double U-shaped detection device.
Detailed Description
The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present specification.
In the embodiment of the specification, the detection tool is prepared by using a magnetic material with high magnetic permeability and low loss so as to detect the non-annular magnetic core. The detection tool can also be called a detection device and a magnetic short-circuit component. The magnetic core material may be ferrite, nanocrystalline material, or the like. Wherein ferrite refers to a composite oxide (such as BaO.6Fe2O3, mnO.Fe 2O3·ZnO·Fe2O3, etc.) composed of iron oxide and one or more other metal oxides. In the embodiment of the present specification, the ferrite used may be a soft magnetic ferrite. In one embodiment, the ferrite used is in particular manganese zinc ferrite.
The detection device may be combined with a non-conventional toroidal core (e.g., a bar-shaped core) to form a closed magnetic loop. The magnetic permeability of the designed detection device is larger than the set magnetic permeability of the magnetic core to be detected, and the sectional area of any position of the detection device is larger than the effective sectional area Ae of the magnetic core to be detected, so that the loss of the detection device is negligible compared with the loss of the magnetic core to be detected, and the purpose of detecting the loss of the non-annular magnetic core can be achieved. In some embodiments, the magnetic permeability of the detection device is more than 50 times that of the magnetic core to be detected, and the cross-sectional area of the detection device and the contact area of the detection device and the magnetic core to be detected are both larger than the effective cross-sectional area Ae of the magnetic core to be detected.
The detection device is designed into a U-shaped structure and comprises a yoke part and column parts positioned on two sides of the yoke part. The detection device of the U-shaped structure can also be called a U-shaped detection device. The yoke may also be referred to as an iron yoke. The heights of the two side column parts are consistent. Wherein, the cross section area of iron yoke portion and post portion is greater than the effective cross section area of magnetic core. The U-shaped structure groove portion, i.e., the iron yoke portion, can be used for winding. During detection, the non-annular magnetic core is placed on the end faces of the two column parts, the magnetic core to be detected or the iron yoke part of the detection device is wound, two ends of the wire are connected to corresponding joints of the detection instrument, and the magnetic properties such as magnetic permeability, loss and the like of the non-annular magnetic core can be directly detected through the detection instrument.
In the embodiments of the present specification, suitable detection instruments include a B-H tester (SY-8218/SY-8219), a DC stack tester (SY-961/SY-960), a wide temperature range incubator-scanning system (SY-330), and the like.
In the implementation of the solution, the detection device meeting the above requirements may be selected or prepared according to the magnetic properties (such as permeability) and dimensions of the core to be detected.
Next, in various embodiments, embodiments of magnetic core magnetic properties are detected.
In example 1, a single U-shaped detection device detects the magnetic properties of a non-toroidal core.
Referring to FIG. 3, a 95 material ferrite magnet can be selected to prepare a U-shaped detection device with magnetic permeability larger than 3000U and size 80mm to 50mm to 40 mm. As shown in FIG. 3, the U-shaped groove has a dimension of 30 mm.about.10 mm. Namely the length of the inner side of the U-shaped groove is 30mm, and the height is 10mm
Referring to fig. 1 and 2, a magnetic core to be detected is placed on a U-shaped detection device. Wherein, part 1 of magnetic core is placed on one post portion of U type detection device, and part 2 of magnetic core is placed on another post portion of U type detection device. The contact area of the part 1 and the corresponding pillar portion, and the contact area of the part 2 and the corresponding pillar portion may be collectively referred to as a contact area SA1-2.
Wherein, the contact area SA1-2 of each column part of the magnetic core and the U-shaped detection device is larger than the effective sectional area SA1-1 of the magnetic core. Namely SA 1-2:SA 1-1 > 1. And, theoretically, the larger the ratio of SA 1-2:SA 1-1, the better.
Wherein 30 in fig. 1 indicates the distance between part 1 and part 2. R20 in fig. 1 represents an end face on the local 1 side. 40 in fig. 2 represents the width of the core middle portion, and 20 represents the thickness of the core middle portion.
Referring to fig. 3, the magnetic path passing area of the U-shaped detecting device, that is, the sectional area SF1-1 of the yoke portion and the sectional area SF1-2 of the pillar portion of the U-shaped detecting device are both larger than the effective sectional area SA1-1 of the magnetic core to be detected.
Wherein 50 in fig. 3 represents the width of the U-shaped detecting device, 40 represents the height of the U-shaped detecting device, and 80 represents the length of the U-shaped detecting device.
In one example of this embodiment, referring to fig. 4A, after the core to be detected is placed on the U-shaped detection device, the core to be detected may be wound, and may specifically be wound at a position between the part 1 and the part 2. The wires are then connected to corresponding interfaces of the detection instrument for detection of magnetic properties. Wherein the magnetic circuit simulation diagram in this example is shown in fig. 4B. The specific detection result will be specifically described in the following table, and will not be described herein.
As can be seen from the magnetic circuit simulation diagram shown in fig. 4B, the magnetic induction lines are denser in the column end face memory part of the U-shaped detection device. This shows that the magnetic circuit uniformity is low, which is caused by the characteristic that magnetic force lines tend to have shortest paths, so that the phenomenon of local magnetic induction saturation easily occurs, and the detection result of the magnetic performance of the magnetic core is affected.
In one example of this embodiment, referring to fig. 5A, the yoke of the U-shaped test device may be wound and then the wire connected to the corresponding interface of the test instrument for testing magnetic properties. Wherein the magnetic circuit simulation diagram in this example is shown in fig. 5B. The specific detection result will be specifically described in the following table, and will not be described herein.
In this example, the yoke of the detection device is wound, so that the winding on the magnetic cores is not required to be repeated when different magnetic cores are detected, the detection operation is further simplified, and the detection efficiency is improved.
In one example of the present embodiment, in order to cope with the above, a space is provided between the side core to be inspected and the end face of the pillar portion of the U-shaped detection device. Specifically, a space is provided between the part 1 and the end face of the corresponding pillar portion, and a space is provided between the part 2 and the end face of the corresponding pillar portion. The thickness of the gap is 0.01mm-2mm, preferably 0.1mm.
In one illustrative example, the gap may be an air gap.
In one illustrative example, the space may be a sheet insulator, such as insulating paper, insulating sheet, or the like. In one example, the sheet-like insulator may be padded between the part 1 and the end face of the corresponding pillar portion, or may be padded between the part 2 and the end face of the corresponding pillar portion. In one example, a sheet insulator is provided on the end face of the pillar portion of the U-shaped detection device. When the core to be inspected is placed on the U-shaped inspection device, the parts 1 and 2 may be in direct contact with the sheet-like insulators on the end faces of the respective posts, instead of being in direct contact with the end faces of the posts.
Therefore, the whole magnetic loop of the U-shaped detection device is more uniform, and the accuracy of the magnetic performance detection result is improved.
In one example of the present embodiment, a groove matching the shape of the part 1 may be provided in the end face of the pillar portion of the U-shaped detection device at a position for carrying the part 1. Illustratively, the depth of the groove is not greater than 1/2 of the height of the part 1, and when the part 1 is placed in the groove, the gap between the edge of the part 1 and the inner side edge of the groove is smaller than 0.2mm, so that the deviation of the placement position of the magnetic core is less than 0.2mm. The height direction of the part 1 refers to the direction perpendicular to the bottom of the groove when the part 1 is positioned in the groove.
A groove matching the shape of the part 2 may be provided in the end face of the pillar part of the U-shaped detection device at a position for carrying the part 2. Illustratively, the depth of the groove is not greater than 1/2 of the height of the part 2, and when the part 2 is placed in the groove, the gap between the edge of the part 2 and the inner side edge of the groove is smaller than 0.2mm, so that the deviation of the placement position of the magnetic core is smaller than 0.2mm. The height direction of the part 1 refers to the direction perpendicular to the bottom of the groove when the part 2 is positioned in the groove.
In this embodiment, a U-shaped detection device may be used to detect the magnetic properties of the core. When in detection, only the magnetic core is required to be placed on the U-shaped detection device, and the device is suitable for rapid continuous testing. In particular, the magnetic core performance can be detected more conveniently in a mode of winding the yoke part of the detection device.
In example 2, the double U-shaped detection device detects the magnetic properties of the non-toroidal core.
The magnetic core may be detected using a U-shaped detection device a and a U-shaped detection device B. The description of embodiment 1 may be referred to for the U-shaped detection device a and the U-shaped detection device B, and will not be repeated here. In example 2, the two U-shaped detection devices are referred to as detection devices, i.e., the detection device is composed of a U-shaped detection device a and a U-shaped detection device B. The U-shaped detecting device a may be referred to as a U-shaped detecting member a, and the U-shaped detecting device B may be referred to as a U-shaped detecting member B.
Referring to fig. 6A and 6B, when detecting the magnetic core, the open ends of the U-shaped detecting device a and the U-shaped detecting device B are arranged opposite to each other, and the magnetic core to be detected is placed between the U-shaped detecting device a and the U-shaped detecting device B. Specifically, the part 1 of the magnetic core may be placed between the pillar portion A1 of the U-shaped detection device a and the pillar portion B1 of the U-shaped detection device B, and the part 2 of the magnetic core may be placed between the pillar portion A2 of the U-shaped detection device a and the pillar portion B2 of the U-shaped detection device B. Then, a wire is wound between the parts 1 and 2 in the magnetic core, and then the wire is connected to a corresponding interface of a detection instrument to perform detection of magnetic properties. Wherein a magnetic circuit simulation diagram in this example is shown in fig. 7.
Wherein, the sum of the contact area of the part 1 and the column part A1 and the contact area of the part 1 and the column part B1 is the contact area SA1-2. The sum of the contact area of the part 2 and the pillar portion A2 plus the contact area of the part 2 and the pillar portion B2 is the contact area SA1-2'.
The contact areas SA1-2 and SA1-2' are both larger than the effective cross-sectional area SA1-1 of the core. Namely SA 1-2:SA 1-1 > 1, and SA 1-2':SA 1-1 > 1. And, in theory, the larger the ratio of SA 1-2:SA 1-1 and the ratio of SA 1-2':SA 1-1, the better.
The magnetic circuit passing area of the detection device, namely the sectional area of the iron yoke part and the sectional area of the column part of the U-shaped detection device A are larger than the effective sectional area SA1-1 of the magnetic core to be detected, and the sectional area of the iron yoke part and the sectional area of the column part of the U-shaped detection device B are larger than the effective sectional area SA1-1 of the magnetic core to be detected.
The scheme of embodiment 2 adopts two ferrite frock, and ferrite has shared the influence of magnetic circuit length difference to the magnetic core, and the magnetic circuit degree of consistency is higher, and detection effect error is less.
In one example of the present embodiment, grooves matching the shape of the part 1 may be provided at positions for carrying the part 1 in the end faces of the pillar part A1 and the pillar part B1. Illustratively, the depth of the groove is not greater than 1/2 of the height of the part 1, and when the part 1 is placed in the groove, the gap between the edge of the part 1 and the inner side edge of the groove is smaller than 0.2mm, so that the deviation of the placement position of the magnetic core is less than 0.2mm. The height direction of the part 1 refers to the direction perpendicular to the bottom of the groove when the part 1 is positioned in the groove.
In one example of the present embodiment, grooves matching the shape of the portions 2 may be provided at positions for carrying the portions 2 in the end faces of the pillar portions A2 and B2. Illustratively, the depth of the groove is not greater than 1/2 of the height of the part 1, and when the part 2 is placed in the groove, the gap between the edge of the part 1 and the inner side edge of the groove is smaller than 0.2mm, so that the deviation of the placement position of the magnetic core is smaller than 0.2mm. The height direction of the part 1 refers to the direction perpendicular to the bottom of the groove when the part 2 is positioned in the groove.
In one example of the present embodiment, in order to cope with the above, a space is provided between the side core to be inspected and the end face of the pillar portion of the U-shaped detection device. Specifically, a space is provided between the part 1 and the end face of the pillar portion A1, and between the part 1 and the pillar portion B1, and a space is provided between the part 2 and the end face of the pillar portion A2, and between the part 2 and the pillar portion B2. The thickness of the gap is 0.01mm-2mm, preferably 0.1mm.
In one illustrative example, the gap may be an air gap.
In one illustrative example, the space may be a sheet insulator, such as insulating paper, insulating sheet, or the like. In one example, the sheet-like insulator may be padded between the part 2 and the end face of the corresponding pillar portion, or may be padded between the part 2 and the end face of the corresponding pillar portion. In one example, sheet insulators are provided on end surfaces of the column portions A1, A2, B1, and B2. When the core to be inspected is placed on the U-shaped inspection device, the parts 1 and 2 may be in direct contact with the sheet-like insulators on the end faces of the respective posts, instead of being in direct contact with the end faces of the posts.
Therefore, the whole magnetic loop of the U-shaped detection device is more uniform, and the accuracy of the magnetic performance detection result is improved.
Next, in examples 3 to 6, magnetic permeability and loss of the magnetic core were tested according to the schemes shown in table 1. Wherein, the same metal powder material is adopted to press a block-shaped magnetic core with the magnetic permeability of 60u, and the heat treatment is carried out. And a plurality of block-shaped magnetic cores are engraved to form magnetic rings for detection to serve as a comparison example. Wherein, the material of the block-shaped magnetic core is 95 ferrite. The size of the block-shaped magnetic core is as follows: 80mm long, 50mm wide and 40mm high. The test conditions in each of the examples shown in Table 1 were 20KHz, 50mT. In addition, the end face of the column part of the U-shaped detection device in each embodiment shown in Table 1 is provided with a groove and a sheet insulator.
TABLE 1
Next, in examples 7 to 10, magnetic permeability and loss of the magnetic core were tested according to the schemes shown in table 2. Wherein, the same metal powder material is adopted to press a block-shaped magnetic core with the magnetic permeability of 70u, and the heat treatment is carried out. And a plurality of block-shaped magnetic cores are engraved to form magnetic rings for detection to serve as a comparison example. Wherein, the material of the block-shaped magnetic core is 95 ferrite. The size of the block-shaped magnetic core is as follows: 80mm long, 50mm wide and 40mm high. The test conditions in each of the examples shown in Table 2 were 20KHz, 50mT. In addition, the end face of the column part of the U-shaped detection device in each embodiment shown in Table 2 is provided with a groove and a sheet insulator.
TABLE 2
Next, in examples 11 to 12, the magnetic properties of the cores before and after polishing were tested for differences according to the protocols shown in table 3. Wherein, the same metal powder material is adopted to press a block-shaped magnetic core with the magnetic permeability of 70u, and the heat treatment is carried out. And a plurality of block-shaped magnetic cores are engraved to form magnetic rings for detection to serve as a comparison example. Wherein, the material of the block-shaped magnetic core is 95 ferrite. The size of the block-shaped magnetic core is as follows: 80mm long, 50mm wide and 40mm high. The test conditions in each of the examples shown in Table 3 were 20KHz, 50mT. In addition, the end face of the column part of the U-shaped detection device in each embodiment shown in Table 3 is provided with a groove and a sheet insulator. The polishing tool is a polishing cloth and a polishing abrasive.
TABLE 3 Table 3
Next, in examples 13 to 20, the magnetic properties of the cores were affected by the test pressure according to the protocol shown in table 4. Wherein, the pressure is set to 50N, 100N, 200N and 500N, and gravity pressure is applied right above the nonmagnetic material weight. Wherein, the same metal powder material is adopted to press a block-shaped magnetic core with the magnetic permeability of 70u, and the heat treatment is carried out. And a plurality of block-shaped magnetic cores are engraved to form magnetic rings for detection to serve as a comparison example. Wherein, the material of the block-shaped magnetic core is 95 ferrite. The size of the block-shaped magnetic core is as follows: 80mm long, 50mm wide and 40mm high. The test conditions in each of the examples shown in Table 4 were 20KHz, 50mT. In addition, the end face of the column part of the U-shaped detection device in each embodiment shown in Table 4 is provided with a groove and a sheet insulator.
TABLE 4 Table 4
It will be appreciated that the various numerical numbers referred to in the embodiments of the present specification are merely for ease of description and are not intended to limit the scope of the embodiments of the present specification.
Claims (13)
1. The nondestructive testing method for the non-annular magnetic core is characterized by comprising the following steps of:
Acquiring set magnetic performance and set size of a magnetic core to be detected, wherein the shape of the magnetic core to be detected is non-annular;
Selecting a U-shaped detection device with a first magnetic property and a first structure according to the set magnetic property and the set size; wherein the first magnetic property is higher than the set magnetic property; the first structure is such that when the magnetic core to be detected is mounted on the U-shaped detection device through two column portions of the U-shaped detection device, a contact area between the magnetic core to be detected and each of the two column portions is larger than an effective cross-sectional area of the magnetic core to be detected, and the first structure is such that a cross-sectional area of any one of the two column portions is larger than an effective cross-sectional area of the magnetic core to be detected, and a cross-sectional area of any one of yoke portions of the U-shaped detection device is larger than an effective cross-sectional area of the magnetic core to be detected, the yoke portions being portions of the U-shaped detection device between the two column portions; the first magnetic property comprises a first magnetic permeability, the set magnetic property comprises a second magnetic permeability, and the first magnetic permeability is more than 50 times of the second magnetic permeability;
The magnetic core to be detected is carried to the U-shaped detection device through the two column parts, and the relative positions of the magnetic core to be detected and the two column parts are adjusted, so that the contact area between each column part of the two column parts and the magnetic core to be detected is larger than the effective sectional area of the magnetic core to be detected;
winding a first wire on a first part to be detected, and connecting two ends of the first wire to corresponding ports of a magnetic performance detector respectively, so that the magnetic performance detector can detect the magnetic performance of the magnetic core to be detected.
2. The method according to claim 1, wherein,
The first part to be detected is a part of the magnetic core to be detected between the two column parts, or
The first part to be detected is a yoke part of the U-shaped detection device.
3. The detection method according to claim 1, wherein a first space is provided between an end face of a first pillar portion of the two pillar portions and a first part, the thickness of the first space is 0.01mm-2mm, and the first part is a part of the magnetic core to be detected, which is opposite to the end face of the first pillar portion;
The first gap is an air gap or a sheet insulator.
4. The detection method according to claim 1, wherein an end face of a first pillar portion of the two pillar portions is provided with a first groove for accommodating a first part, the first part being a part of the core to be detected opposite to the end face of the first pillar portion;
The depth of the first groove is not larger than the height of the first part, wherein the height direction of the first part is perpendicular to the end face of the first column part;
The gap between the part of the first part, which is placed in the first groove, and the inner side edge of the first groove is smaller than 0.2mm.
5. The nondestructive testing method for the non-annular magnetic core is characterized by comprising the following steps of:
Acquiring set magnetic performance and set size of a magnetic core to be detected, wherein the shape of the magnetic core to be detected is non-annular;
Selecting a detection device with first magnetic property according to the set magnetic property and the set size, wherein the detection device comprises a first U-shaped detection component and a second U-shaped detection component which are arranged in a split manner; the first U-shaped detection component is provided with a first column part and a second column part, and the second U-shaped detection component is provided with a third column part and a fourth column part; wherein, in a use state of the detection device, the first column part and the third column part are arranged oppositely, and the second column part and the fourth column part are arranged oppositely;
Placing the magnetic core to be detected between the first U-shaped detection component and the second U-shaped detection component, wherein a first part of the magnetic core to be detected is positioned between the first column part and the third column part, a second part of the magnetic core to be detected is positioned between the second column part and the fourth column part, and the first part and the second part are opposite two ends in the magnetic core to be detected; wherein the sum of the contact area between the first part and the first column part plus the contact area between the first part and the third column part is larger than the effective sectional area of the magnetic core to be detected, and the sum of the contact area between the second part and the second column part plus the contact area between the second part and the fourth column part is larger than the effective contact area of the magnetic core to be detected;
Winding a first wire on a first part to be detected, and respectively connecting two ends of the first wire to corresponding ports of a magnetic performance detector so that the magnetic performance detector can detect the magnetic performance of the magnetic core to be detected; wherein,
The first part to be detected is a part of the magnetic core to be detected, which is positioned between the first column part and the third column part.
6. The method of detecting according to claim 5, wherein the first pillar portion and the first portion have a first space therebetween; and/or the number of the groups of groups,
A first space is arranged between the third column part and the first part; and/or the number of the groups of groups,
A first interval is arranged between the second column part and the second part; and/or the number of the groups of groups,
A first space is arranged between the fourth column part and the second part;
The first interval is an air gap or a sheet insulator, and the thickness of the first interval is 0.01-2 mm.
7. The detection method according to claim 5, wherein an end face of the first pillar portion is provided with a first groove for accommodating the first part; the depth of the first groove is not larger than the height of the first part, wherein the height direction of the first part is perpendicular to the end face of the first column part; the gap between the part of the first part which is arranged in the first groove and the inner side edge of the first groove is smaller than 0.2m m; and/or the number of the groups of groups,
The end face of the second column part is provided with a second groove for accommodating the second part; the depth of the second groove is not larger than the height of the second part, wherein the height direction of the second part is perpendicular to the end face of the second column part; the gap between the part of the second part which is arranged in the second groove and the inner side edge of the second groove is smaller than 0.2m m; and/or the number of the groups of groups,
The end face of the third column part is provided with a third groove for accommodating the first part; the depth of the third groove is not larger than the height of the first part, wherein the height direction of the first part is perpendicular to the end face of the third column part; the gap between the part of the first part, which is placed in the third groove, and the inner side edge of the first groove is smaller than 0.2m m; and/or the number of the groups of groups,
The end face of the fourth column part is provided with a fourth groove for accommodating the second part; the depth of the fourth groove is not larger than the height of the second part, wherein the height direction of the second part is perpendicular to the end face of the fourth column part; the gap between the part of the second part placed in the fourth groove and the inner side edge of the fourth groove is smaller than 0.2mm.
8. The magnetic core detection device is used for nondestructively detecting the magnetic performance of the non-annular magnetic core, and is characterized by being a first magnetic performance U-shaped detection device, wherein the first magnetic performance is higher than the set magnetic performance of the non-annular magnetic core; the first magnetic property comprises a first magnetic permeability, the set magnetic property comprises a second magnetic permeability, and the first magnetic permeability is more than 50 times of the second magnetic permeability;
The U-shaped detection device comprises: two column parts and a yoke part between the two column parts; wherein a cross-sectional area of any one of the two leg portions and a cross-sectional area of any one of the yoke portions are larger than an effective cross-sectional area of the non-toroidal core;
the two leg portions are used for carrying the non-annular magnetic core, and when the two leg portions carry the non-annular magnetic core, the contact area between the non-annular magnetic core and each of the two leg portions is larger than the effective sectional area of the non-annular magnetic core.
9. The magnetic core detection apparatus according to claim 8, wherein an end face of a first one of the two leg portions is provided with a sheet-like insulator having a thickness of 0.01mm to 2mm.
10. The magnetic core detection apparatus according to claim 8, wherein an end face of a first one of the two leg portions is provided with a first recess for accommodating a first part, which is a portion of the non-annular magnetic core that is opposite to the end face of the first leg portion when the non-annular magnetic core is mounted on the two leg portions;
The depth of the first groove is not larger than the height of the first part, wherein the height direction of the first part is perpendicular to the end face of the first column part;
When the two column parts carry the non-annular magnetic core, the gap between the part of the first part which is arranged in the first groove and the inner side edge of the first groove is smaller than 0.2mm.
11. The magnetic core detection device is used for nondestructively detecting the magnetic performance of the non-annular magnetic core, and is characterized by being a first magnetic performance U-shaped detection device, wherein the first magnetic performance is higher than the set magnetic performance of the non-annular magnetic core;
The detection device comprises a first U-shaped detection component and a second U-shaped detection component which are arranged in a split mode; the first U-shaped detection component is provided with a first column part and a second column part, and the second U-shaped detection component is provided with a third column part and a fourth column part; wherein,
In the use state of the detection device, the first column part and the third column part are arranged oppositely, and the second column part and the fourth column part are arranged oppositely; a first part of the non-annular magnetic core is positioned between the first column part and the third column part, a second part of the non-annular magnetic core is positioned between the second column part and the fourth column part, and the first part and the second part are two opposite ends in the non-annular magnetic core; wherein the sum of the contact area between the first part and the first column part plus the contact area between the first part and the third column part is larger than the effective cross-sectional area of the non-annular magnetic core, and the sum of the contact area between the second part and the second column part plus the contact area between the second part and the fourth column part is larger than the effective contact area of the non-annular magnetic core.
12. The magnetic core detection apparatus according to claim 11, wherein an end face of the first pillar portion is provided with a sheet-like insulator; and/or, the end face of the second column part is provided with a sheet insulator; and/or the end face of the third column part is provided with a sheet insulator; and/or, the end face of the fourth column part is provided with a sheet insulator;
Wherein the thickness of the sheet insulator is 0.01mm-2mm.
13. The magnetic core detection apparatus according to claim 11, wherein an end face of the first pillar portion is provided with a first recess for accommodating the first part; the depth of the first groove is not larger than the height of the first part, wherein the height direction of the first part is perpendicular to the end face of the first column part; the gap between the part of the first part which is arranged in the first groove and the inner side edge of the first groove is smaller than 0.2m m; and/or the number of the groups of groups,
The end face of the second column part is provided with a second groove for accommodating the second part; the depth of the second groove is not larger than the height of the second part, wherein the height direction of the second part is perpendicular to the end face of the second column part; the gap between the part of the second part which is arranged in the second groove and the inner side edge of the second groove is smaller than 0.2m m; and/or the number of the groups of groups,
The end face of the third column part is provided with a third groove for accommodating the first part; the depth of the third groove is not larger than the height of the first part, wherein the height direction of the first part is perpendicular to the end face of the third column part; the gap between the part of the first part, which is placed in the third groove, and the inner side edge of the first groove is smaller than 0.2m m; and/or the number of the groups of groups,
The end face of the fourth column part is provided with a fourth groove for accommodating the second part; the depth of the fourth groove is not larger than the height of the second part, wherein the height direction of the second part is perpendicular to the end face of the fourth column part; the gap between the part of the second part placed in the fourth groove and the inner side edge of the fourth groove is smaller than 0.2mm.
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