CN113534023A - Non-annular magnetic core nondestructive testing method and device - Google Patents
Non-annular magnetic core nondestructive testing method and device Download PDFInfo
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- 238000009659 non-destructive testing Methods 0.000 title claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 178
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- 238000012360 testing method Methods 0.000 claims description 19
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
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Abstract
The specification relates to the technical field of magnetic materials, in particular to a non-annular magnetic core nondestructive testing method and device. The method comprises the following steps: acquiring the set magnetic property and the set size of a magnetic core to be detected; selecting a U-shaped detection device with first magnetic performance and a first structure according to the set magnetic performance and the set size; carrying the magnetic core to be detected to the U-shaped detection device through the two column parts, and adjusting the relative position between the magnetic core to be detected and the two column parts, 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; and winding a first lead on the first part to be detected, and respectively connecting two ends of the first lead to corresponding ports of a magnetic property detector so that the magnetic property detector can detect the magnetic property of the magnetic core to be detected.
Description
Technical Field
The specification relates to the technical field of magnetic materials, in particular to a non-annular magnetic core nondestructive testing method and device.
Background
The magnetic core is an important magnetic core device, has wide application and is an important component of various electronic equipment. The performance of the magnetic core directly or indirectly affects the functionality of the electronic device. Therefore, before the magnetic core is put into use, it is necessary to detect the magnetic properties thereof.
For detecting the magnetic performance of the magnetic core, a complete magnetic loop is required to be formed. With a conventional toroidal core, it constitutes itself a complete closed magnetic loop. Therefore, the magnetic core can be directly wound with wires, and the detection can be directly carried out through a detection instrument. However, the magnetic cores have various shapes due to their various fields of application. In addition to toroidal cores, there are also block-shaped, etc. non-toroidal cores. The non-toroidal core itself is not a closed magnetic loop and is difficult to directly wind upon for detection.
At present, in order to detect the magnetic performance of the 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 to operate and long in time consumption. In addition, in the batch production of actual products, only a small number of samples can be sampled to carry out statistical detection on a large number of magnetic cores, so that errors easily exist in the consistency of the magnetic properties of the batch products.
Disclosure of Invention
The embodiment of the specification provides a non-annular magnetic core nondestructive testing method and device, which can perform nondestructive testing on a non-annular magnetic core, so that the coverage detection on a large batch of magnetic cores can be realized.
In a first aspect, an embodiment of the present specification provides a non-annular magnetic core nondestructive testing method, including the following steps:
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 first magnetic performance and a first structure according to the set magnetic performance and the set size; wherein the first magnetic property is higher than the set magnetic property; the first structure enables the contact area between the magnetic core to be detected and each of the two column parts to be larger than the effective sectional area of the magnetic core to be detected when the magnetic core to be detected is carried on the U-shaped detection device through the two column parts of the U-shaped detection device, the sectional area of any position of each column part of the two column parts to be larger than the effective sectional area of the magnetic core to be detected, the sectional area of any position of a yoke part of the U-shaped detection device to be larger than the effective sectional area of the magnetic core to be detected, and the yoke part is a part between the two column parts in the U-shaped detection device;
carrying the magnetic core to be detected to the U-shaped detection device through the two column parts, and adjusting the relative position between the magnetic core to be detected and the two column parts, 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;
and winding a first lead on the first part to be detected, and respectively connecting two ends of the first lead to corresponding ports of a magnetic property detector so that the magnetic property detector can detect the magnetic property 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 the magnetic core to be detected. In some embodiments, the U-shaped detection device may be made of ferrite or nanocrystal material. In one example of these embodiments, the U-shaped detection means may be composed of 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 magnetic core to be detected is embodied as a strip-shaped magnetic core. In some embodiments, the U-shaped detection device is used for detecting magnetic properties such as permeability, loss and the like of the magnetic core to be detected.
In the solution provided in the embodiment of the present specification, the U-shaped detection device is combined with an unconventional annular, especially, bar-shaped magnetic core to form a closed magnetic loop, and the U-shaped detection device is used as a magnetic short-circuit portion, and both the magnetic permeability and the cross-sectional area of the U-shaped detection device are greater than the index of the magnetic core, so that the loss of the magnetic short-circuit portion can be ignored compared with the magnetic core, and the purpose of testing the magnetic properties of the magnetic core, such as the loss and the magnetic permeability, is achieved.
In some embodiments, the first portion to be detected is a portion of the magnetic core to be detected between the two pillar portions, or the first portion to be detected is a yoke portion of the U-shaped detecting device.
In some embodiments, a first interval is provided between an end surface of a first column part of the two column parts and a first local part, the thickness of the first interval is 0.01mm-2mm, and the first local part is a part of the magnetic core to be detected, which is opposite to the end surface 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 surface of a first column part of the two column parts is provided with a first groove for accommodating a first local part, wherein the first local part is a part of the magnetic core to be detected, which is opposite to the end surface of the first column part; the depth of the first groove is not larger than the height of the first local part, wherein the height direction of the first local part is vertical to the end surface of the first column part; the gap between the part of the first part, which is positioned in the first groove, and the inner side edge of the first groove is less than 0.2 mm.
Through setting up the recess, when the magnetic property of detecting the magnetic core, be convenient for place the magnetic core on 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 specification provide a non-toroidal core nondestructive testing method, including the following steps:
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 part and a second U-shaped detection part which are arranged separately; 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; 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;
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 located between the first column part and the third column part, a second part of the magnetic core to be detected is located between the second column part and the fourth column part, and the first part and the second part are two opposite end parts of the magnetic core to be detected; the sum of the contact area between the first local part and the first column part and the contact area between the first local 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 local part and the second column part and the contact area between the second local part and the fourth column part is larger than the effective contact area of the magnetic core to be detected;
winding a first lead on a first part to be detected, and respectively connecting two ends of the first lead to corresponding ports of a magnetic property detector so that the magnetic property detector can detect the magnetic property of the magnetic core to be detected; wherein the content of the first and second substances,
the first portion to be detected is a portion, between the first column portion and the third column portion, of the magnetic core to be detected.
The first U-shaped detection part and the second U-shaped detection part are both made of high-permeability and low-loss magnetic core materials, 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 nanocrystal. In one example of these embodiments, the first U-shaped sensing part and the second U-shaped sensing part 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 magnetic core to be detected is embodied as a strip-shaped magnetic core. In some embodiments, the U-shaped detection device is used for detecting magnetic properties such as permeability, loss and the like of the magnetic core to be detected.
In some embodiments, the magnetic property detector may be a B-H tester (SY-8218/SY-8219), a DC overlay test station (SY-961/SY-960), a wide temperature range oven scanning system (SY-330), or the like.
In the solution provided in the embodiment of the present specification, the detection device is combined with an unconventional annular, especially, bar-shaped magnetic core to form a closed magnetic loop, and the detection device is used as a magnetic short-circuit portion, and both the magnetic permeability and the cross-sectional area of the detection device are greater than the indexes of the magnetic core, so that the loss of the magnetic short-circuit portion can be ignored compared with the magnetic core, and the purpose of testing the magnetic properties of the magnetic core, such as loss, magnetic permeability and the like, is achieved. And two U-shaped detection parts are adopted, the image of the magnetic core caused by the length difference of the magnetic circuit is reduced, the uniformity of the magnetic circuit in the magnetic circuit is higher, and the error of a detection result is smaller.
In some embodiments, the first post portion has a first spacing from the first portion; and/or a first spacing is provided between the third pillar part and the first part; and/or a first interval is arranged between the second column part and the second local part; and/or a first interval is arranged between the fourth pillar part and the second local part; wherein the first interval is an air gap or a sheet insulator, and the thickness of the first interval is 0.01mm-2 mm.
In some embodiments, an end surface of the first pillar portion is provided with a first groove for accommodating the first partial portion; the depth of the first groove is not larger than the height of the first local part, wherein the height direction of the first local part is vertical to the end surface of the first column part; the gap between the part of the first part, which is positioned in the first groove, and the inner side edge of the first groove is less than 0.2 mm; and/or the end surface of the second column part is provided with a second groove for accommodating the second part; the depth of the second groove is not greater than the height of the second local part, wherein the height direction of the second local part is perpendicular to the end surface 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 less than 0.2 mm; and/or the end surface 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 local part, wherein the height direction of the first local part is vertical to the end surface of the third column part; the gap between the part of the first part, which is positioned in the third groove, and the inner side edge of the first groove is less than 0.2 mm; and/or the end surface 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 local part, wherein the height direction of the second local part is vertical to the end surface of the fourth pillar part; the gap between the part of the second part, which is arranged in the fourth groove, and the inner side edge of the fourth groove is less than 0.2 mm.
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, the present specification provides a magnetic core detection apparatus for nondestructive testing of magnetic properties of a non-annular magnetic core, where the magnetic core detection apparatus is a U-shaped magnetic core detection apparatus with a first magnetic property, and the first magnetic property is higher than a set magnetic property of the non-annular magnetic core;
the U-shaped detection device comprises: two limbs and a yoke portion between the two limbs; wherein a cross-sectional area at any one of each of the two legs and a cross-sectional area at any one of the yoke portions is greater than an effective cross-sectional area of the non-toroidal core;
the two column parts are used for carrying the non-annular magnetic core, and when the two column parts carry the non-annular magnetic core, the contact area between the non-annular magnetic core and each column part of the two column parts is larger than the effective sectional area of the non-annular magnetic core.
In some embodiments, an end face of a first pillar portion of the two pillar portions is provided with a sheet-like insulator having a thickness of 0.01mm to 2 mm.
In some embodiments, an end surface of a first column part of the two column parts is provided with a first groove for accommodating a first part, wherein the first part is a part of the non-annular magnetic core opposite to the end surface of the first column part when the two column parts carry the non-annular magnetic core;
the depth of the first groove is not larger than the height of the first local part, wherein the height direction of the first local part is vertical to the end surface 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 less than 0.2 mm.
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, the present specification provides a magnetic core detection apparatus for nondestructive testing of magnetic properties of a non-annular magnetic core, where the magnetic core detection apparatus is a U-shaped magnetic core detection apparatus with a first magnetic property, and the first magnetic property is higher than a set magnetic property of the non-annular magnetic core;
the detection device comprises a first U-shaped detection part and a second U-shaped detection part 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 the content of the first and second substances,
in the use state of the detection device, the first column part and the third column part are oppositely arranged, and the second column part and the fourth column part are oppositely arranged; 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 end parts of the non-annular magnetic core; wherein a sum of a contact area between the first part and the first pillar portion plus a contact area between the first part and the third pillar portion is greater than an effective cross-sectional area of the non-toroidal core, and a sum of a contact area between the second part and the second pillar portion plus a contact area between the second part and the fourth pillar portion is greater than an effective contact area of the non-toroidal core.
In some embodiments, an end face of the first pillar portion is provided with a sheet-like insulator; and/or a sheet insulator is arranged on the end face of the second column part; and/or a sheet-shaped insulator is arranged on the end surface of the third column part; and/or a sheet-shaped insulator is arranged on the end surface of the fourth column part; wherein the thickness of the sheet-like insulator is 0.01mm-2 mm.
In some embodiments, an end surface of the first pillar portion is provided with a first groove for accommodating the first partial portion; the depth of the first groove is not larger than the height of the first local part, wherein the height direction of the first local part is vertical to the end surface of the first column part; the gap between the part of the first part, which is positioned in the first groove, and the inner side edge of the first groove is less than 0.2 mm; and/or the presence of a gas in the gas,
the end surface of the second column part is provided with a second groove for accommodating the second part; the depth of the second groove is not greater than the height of the second local part, wherein the height direction of the second local part is perpendicular to the end surface 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 less than 0.2 mm; and/or the presence of a gas in the gas,
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 local part, wherein the height direction of the first local part is vertical to the end surface of the third column part; the gap between the part of the first part, which is positioned in the third groove, and the inner side edge of the first groove is less than 0.2 mm; and/or the presence of a gas in the gas,
the end surface 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 local part, wherein the height direction of the second local part is vertical to the end surface of the fourth pillar part; the gap between the part of the second part, which is arranged in the fourth groove, and the inner side edge of the fourth groove is less than 0.2 mm.
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 tested can be used for testing only by being placed on the testing device, the non-annular magnetic core nondestructive testing method and device are suitable for rapid and continuous testing of the non-annular magnetic core, the magnetic core does not need to be carved, and large-scale testing can be carried out on the magnetic core.
Drawings
FIG. 1 shows the contact area of a magnetic core to be tested with a testing device;
FIG. 2 shows the effective cross-sectional area of the core to be tested;
FIG. 3 illustrates a cross-sectional area of a mast portion and a cross-sectional area of a yoke portion of the detection apparatus;
FIG. 4A shows a schematic diagram of a core winding to be tested;
FIG. 4B shows a magnetic circuit simulation of the core winding to be tested;
fig. 4C shows a simulation diagram of the magnetic circuit of the winding on the core to be detected with a space between the detecting device and the core to be detected;
FIG. 5A shows a schematic view of a yoke winding of the detection device;
FIG. 5B is a view showing a simulation of a magnetic circuit of a yoke winding of the detecting unit;
FIG. 6A shows an assembled schematic for testing magnetic properties of a magnetic core using a double U-shaped test device;
FIG. 6B shows an exploded view of the magnetic properties of a magnetic core using a double U-shaped detector assembly;
fig. 7 shows a simulation diagram of a magnetic circuit for detecting the performance of a magnetic core using a double U-shaped detection device.
Detailed Description
The technical solution in the embodiments of the present invention will be described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present disclosure, and not all embodiments.
In the embodiment of the specification, a detection tool is prepared by using a high-permeability and low-loss magnetic material to detect the non-annular magnetic core. Wherein, detect frock also can be called and detect dressAnd a magnetic short-circuit component. The magnetic core material can be ferrite, nanocrystalline material, and the like. Wherein ferrite is a composite oxide composed of iron oxide and one or more other metal oxides (e.g. BaO.6Fe2O 3, MnO. Fe)2O3·ZnO·Fe2O3Etc.). In the embodiments of the present specification, the ferrite used may be a soft magnetic ferrite. In one embodiment, the ferrite used is specifically manganese zinc ferrite.
The detection device may be combined with an unconventional toroidal core (e.g., a bar-and-block core) to form a closed magnetic loop. The designed detection device has the magnetic permeability larger than the set magnetic permeability of the magnetic core to be detected, and the sectional area of any position in 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 of the magnetic permeability of the core to be detected, and the sectional area of the detection device and the contact area of the detection device and the core to be detected are both larger than the effective sectional area Ae of the 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 U-shaped detection device may also be referred to as a U-shaped detection device. Among them, yokes may also be referred to as iron yokes. The height of the two side column parts is consistent. Wherein, the sectional areas of the iron yoke part and the column part are both larger than the effective sectional area of the magnetic core. The U-shaped structural groove portion, i.e., the iron yoke portion, may be used for winding. During detection, the non-annular magnetic core is placed on the end faces of the two column portions, the wire is wound on the magnetic core to be detected or the iron yoke portion of the detection device, the two ends of the wire are connected to the corresponding connectors of the detection instrument, and the magnetic properties of the non-annular magnetic core, such as magnetic permeability, loss and the like, can be directly detected through the detection instrument.
In the embodiments of the present description, suitable detection instruments include a B-H tester (SY-8218/SY-8219), a DC superposition test stand (SY-961/SY-960), a wide temperature range oven scanning system (SY-330), and the like.
In the embodiment, the detection device meeting the above requirements can be selected or prepared according to the magnetic property (such as permeability) and size of the magnetic core to be detected.
Next, in various embodiments, specific schemes for detecting magnetic properties of the magnetic core are provided.
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 manufacture a U-shaped detection device with a magnetic permeability of more than 3000U and a size of 80mm x 50mm x 40 mm. As shown in FIG. 3, the U-shaped groove has a dimension of 30mm by 10 mm. Namely, the length of the inner side of the U-shaped groove is 30mm and the height thereof is 10mm
Referring to fig. 1 and 2, the magnetic core to be tested is placed on a U-shaped testing device. Wherein part 1 of the magnetic core is placed on one column part of the U-shaped detection device and part 2 of the magnetic core is placed on the other column part of the U-shaped detection device. The contact area of the local portion 1 and the corresponding pillar portion, and the contact area of the local portion 2 and the corresponding pillar portion may be collectively referred to as a contact area SA 1-2.
The contact area SA1-2 of the magnetic core and each column part of the U-shaped detection device is larger than the effective cross-sectional area SA1-1 of the magnetic core. Namely SA 1-2: SA1-1 > 1. And theoretically, the larger the ratio of SA 1-2: SA1-1, the better.
Where 30 in fig. 1 denotes the distance between part 1 and part 2. R20 in fig. 1 indicates a partial 1-side end surface. In fig. 2, 40 denotes the width of the core middle portion, and 20 denotes the thickness of the core middle portion.
Referring to fig. 3, the magnetic path passing area of the U-shaped detecting device, i.e. the cross-sectional area SF1-1 of the iron yoke portion and the cross-sectional area SF1-2 of the column portion of the U-shaped detecting device, are both larger than the effective cross-sectional area SA1-1 of the magnetic core to be detected.
In fig. 3, 50 denotes the width of the U-shaped detecting device, 40 denotes the height of the U-shaped detecting device, and 80 denotes 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, a wire may be wound on the core to be detected, and a wire may be wound specifically at a position between the part 1 and the part 2. The wires are then connected to the respective interfaces of the detection instrument for detection of the magnetic properties. The magnetic circuit simulation diagram in this example is shown in fig. 4B. The specific detection results will be specifically described in the following table, and will not be described herein again.
As can be seen from the magnetic circuit simulation diagram shown in fig. 4B, the magnetic induction lines are dense in the column end face of the U-shaped detector. This indicates that the magnetic circuit has low uniformity, which is caused by the characteristic that the magnetic lines of force tend to be the shortest path, and the phenomenon of local magnetic induction saturation is easy to occur, which affects the detection result of the magnetic performance of the magnetic core.
In one example of this embodiment, referring to FIG. 5A, the wire may be wound around the yoke of the U-shaped detection device and then connected to the corresponding interface of the detection instrument for detection of the magnetic properties. The magnetic circuit simulation diagram in this example is shown in fig. 5B. The specific detection results will be specifically described in the following table, and will not be described herein again.
In this example, the yoke portion of the detection device is wound, so that when different magnetic cores are detected, the magnetic cores do not need to be repeatedly wound, detection operation is further simplified, and detection efficiency is improved.
In one example of the present embodiment, in order to cope with the above, a space is provided between the core to be inspected and the end surface of the columnar portion of the U-shaped detection device. Specifically, a space is provided between the local portion 1 and the end surface of the corresponding pillar portion, and a space is provided between the local portion 2 and the end surface of the corresponding pillar portion. The thickness of the space is 0.01mm to 2mm, preferably 0.1 mm.
In one illustrative example, the spacing may be an air gap.
In one illustrative example, the space may be a sheet-like insulator, such as an insulating paper, an insulating sheet, or the like. In one example, a sheet-like insulator may be interposed between the local portion 1 and the end surface of the corresponding pillar portion, or a sheet-like insulator may be interposed between the local portion 2 and the end surface of the corresponding pillar portion. In one example, a sheet-like insulator is provided on an end surface of a column portion of the U-shaped detection device. When the magnetic core to be detected is placed on the U-shaped detection device, the local parts 1 and 2 can be directly contacted with the sheet-shaped insulators on the end faces of the corresponding column parts, but not directly contacted with the end faces of the column parts.
Therefore, the whole magnetic loop of the U-shaped detection device is more uniform, and the accuracy of the magnetic property detection result is improved.
In one example of the present embodiment, a groove matching the shape of the local portion 1 may be provided in the end surface of the pillar portion of the U-shaped detection device at a position for bearing the local portion 1. Illustratively, the depth of the groove is not more than 1/2 local 1 height, and when local 1 is placed in the groove, the gap between the edge of local 1 and the inner edge of the groove is less than 0.2mm, thereby ensuring that the deviation of the magnetic core placement position is less than 0.2 mm. Wherein, the height direction of the local 1 is the direction perpendicular to the bottom of the groove when the local 1 is located in the groove.
At the position for bearing the part 2 in the end surface of the column part of the U-shaped detection device, a groove matching the shape of the part 2 may be provided. Illustratively, the depth of the recess is not greater than 1/2, the height of the part 2, and when the part 2 is placed in the recess, the gap between the edge of the part 2 and the inner edge of the recess is less than 0.2mm, so as to ensure that the deviation of the placement position of the magnetic core is less than 0.2 mm. Wherein, the height direction of the local part 1 is the direction perpendicular to the bottom of the groove when the local part 2 is positioned in the groove.
In this embodiment, a U-shaped detection device may be employed to detect the magnetic properties of the core. When detecting, only need with the magnetic core place to U type detection device on can, be fit for quick continuous test. Particularly, the magnetic core performance can be more conveniently detected in a winding mode of a yoke part of the detection device.
Example 2, a double U-shaped detection device detects the magnetic properties of a non-toroidal core.
The magnetic core can be detected by using a U-shaped detection device A and a U-shaped detection device B. For the U-shaped detection device a and the U-shaped detection device B, reference may be specifically made to the description of embodiment 1, and details are not described herein again. In embodiment 2, the two U-shaped detection devices are referred to as detection devices, that is, the detection devices are composed of a U-shaped detection device a and a U-shaped detection device B. The U-shaped detection device A can be called a U-shaped detection part A, and the U-shaped detection device B can be called a U-shaped detection part B.
Referring to fig. 6A and 6B, when the magnetic core is detected, the open ends of the U-shaped detection device a and the U-shaped detection device B are oppositely arranged, and the magnetic core to be detected is placed between the U-shaped detection device a and the U-shaped detection device B. Specifically, the local portion 1 of the magnetic core may be placed between the column portion a1 of the U-shaped detecting device a and the column portion B1 of the U-shaped detecting device B, and the local portion 2 of the magnetic core may be placed between the column portion a2 of the U-shaped detecting device a and the column portion B2 of the U-shaped detecting device B. Then, a wire is wound between the part 1 and the part 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. The magnetic circuit simulation diagram in this example is shown in fig. 7.
The sum of the contact area between local 1 and pillar a1 and the contact area between local 1 and pillar B1 is contact area SA 1-2. The sum of the contact area of local 2 and pillar a2 and the contact area of local 2 and pillar B2 is contact area SA 1-2'.
Contact areas SA1-2 and SA 1-2' are both larger than the effective cross-sectional area SA1-1 of the magnetic core. Namely SA 1-2: SA1-1 > 1, and SA 1-2': SA1-1 > 1. In addition, theoretically, the larger the ratio of SA1-2 to SA1-1 and the ratio of SA 1-2' to SA1-1, the better.
The magnetic path 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 both 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 both larger than the effective sectional area SA1-1 of the magnetic core to be detected.
The scheme of embodiment 2 adopts two ferrite frocks, and the 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 littleer.
In one example of the present embodiment, at the position for bearing the local 1 in the end surface of the pillar portion a1 and the pillar portion B1, a groove matching the shape of the local 1 may be provided. Illustratively, the depth of the groove is not more than 1/2 local 1 height, and when local 1 is placed in the groove, the gap between the edge of local 1 and the inner edge of the groove is less than 0.2mm, thereby ensuring that the deviation of the magnetic core placement position is less than 0.2 mm. Wherein, the height direction of the local 1 is the direction perpendicular to the bottom of the groove when the local 1 is located in the groove.
In one example of the present embodiment, at the position for bearing the local 2 in the end surface of the pillar portion a2 and the pillar portion B2, a groove matching the shape of the local 2 may be provided. Illustratively, the depth of the recess is no greater than 1/2 part 1 height, and part 2 is placed in the recess with a gap of less than 0.2mm from the edge of part 1 to the inner edge of the recess, thereby ensuring a core placement deviation of < 0.2 mm. Wherein, the height direction of the local part 1 is the direction perpendicular to the bottom of the groove when the local 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 core to be inspected and the end surface of the columnar portion of the U-shaped detection device. Specifically, a space is provided between local portion 1 and the end face of pillar a1, between local portion 1 and pillar B1, between local portion 2 and the end face of pillar a2, and between local portion 2 and pillar B2. The thickness of the space is 0.01mm to 2mm, preferably 0.1 mm.
In one illustrative example, the spacing may be an air gap.
In one illustrative example, the space may be a sheet-like insulator, such as an insulating paper, an insulating sheet, or the like. In one example, a sheet-like insulator may be interposed between the local portion 2 and the end surface of the corresponding pillar portion, or between the local portion 2 and the end surface of the corresponding pillar portion. In one example, a sheet-like insulator is provided on end surfaces of post a1, post a2, post B1, and post B2. When the magnetic core to be detected is placed on the U-shaped detection device, the local parts 1 and 2 can be directly contacted with the sheet-shaped insulators on the end faces of the corresponding column parts, but not directly contacted with the end faces of the column parts.
Therefore, the whole magnetic loop of the U-shaped detection device is more uniform, and the accuracy of the magnetic property detection result is improved.
Next, in examples 3 to 6, the magnetic permeability and the loss of the magnetic core were measured in accordance with the schemes shown in table 1. Wherein a block-shaped magnetic core having a magnetic permeability of 60u is pressed using the same metal powder material, and heat-treated. And selecting a plurality of block-shaped magnetic cores to carve magnetic rings for detection as a comparison example. Wherein, the material of the block-shaped magnetic core is 95 materials of ferrite. The dimensions of the block-shaped magnetic core are: 80mm long, 50mm wide and 40mm high. The test conditions in each example shown in Table 1 were 20KHz and 50 mT. In the embodiments shown in table 1, the U-shaped detection device has a recess and a sheet-like insulator on the end surface of the column.
TABLE 1
Next, in examples 7 to 10, the magnetic permeability and the loss of the magnetic core were measured in accordance with the schemes shown in table 2. Wherein a block-shaped magnetic core having a magnetic permeability of 70u was pressed using the same metal powder material, and heat-treated. And selecting a plurality of block-shaped magnetic cores to carve magnetic rings for detection as a comparison example. Wherein, the material of the block-shaped magnetic core is 95 materials of ferrite. The dimensions of the block-shaped magnetic core are: 80mm long, 50mm wide and 40mm high. The test conditions in each example shown in Table 2 were 20KHz and 50 mT. In addition, in the embodiments shown in table 2, the end surface of the post portion of the U-shaped detection device is provided with a groove and a sheet-like insulator.
TABLE 2
Next, in examples 11 to 12, the difference in magnetic properties of the magnetic cores before and after polishing was tested in accordance with the protocol shown in Table 3. Wherein a block-shaped magnetic core having a magnetic permeability of 70u was pressed using the same metal powder material, and heat-treated. And selecting a plurality of block-shaped magnetic cores to carve magnetic rings for detection as a comparison example. Wherein, the material of the block-shaped magnetic core is 95 materials of ferrite. The dimensions of the block-shaped magnetic core are: 80mm long, 50mm wide and 40mm high. The test conditions in each example shown in Table 3 were 20KHz and 50 mT. In addition, in the embodiments shown in table 3, the end surface of the post portion of the U-shaped detection device is provided with a groove and a sheet-like insulator. The polishing tool is a polishing cloth and a polishing abrasive.
TABLE 3
Next, in examples 13 to 20, the influence of the pressure on the magnetic properties of the magnetic core was tested in accordance with the protocol shown in Table 4. Wherein, the pressure is set to be 50N, 100N, 200N and 500N, and gravity pressure is applied right above the non-magnetic material weight. Wherein a block-shaped magnetic core having a magnetic permeability of 70u was pressed using the same metal powder material, and heat-treated. And selecting a plurality of block-shaped magnetic cores to carve magnetic rings for detection as a comparison example. Wherein, the material of the block-shaped magnetic core is 95 materials of ferrite. The dimensions of the block-shaped magnetic core are: 80mm long, 50mm wide and 40mm high. The test conditions in each example shown in Table 4 were 20KHz and 50 mT. In the embodiments shown in table 4, the U-shaped detection device has a recess and a sheet-like insulator on the end surface of the column portion.
TABLE 4
It is to be understood that the various numerical references referred to in the embodiments of the present specification are merely for descriptive convenience and are not intended to limit the scope of the embodiments of the present specification.
Claims (13)
1. A nondestructive testing method for a non-annular magnetic core is characterized by comprising the following steps:
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 first magnetic performance and a first structure according to the set magnetic performance and the set size; wherein the first magnetic property is higher than the set magnetic property; the first structure enables the contact area between the magnetic core to be detected and each of the two column parts to be larger than the effective sectional area of the magnetic core to be detected when the magnetic core to be detected is carried on the U-shaped detection device through the two column parts of the U-shaped detection device, the sectional area of any position of each column part of the two column parts to be larger than the effective sectional area of the magnetic core to be detected, the sectional area of any position of a yoke part of the U-shaped detection device to be larger than the effective sectional area of the magnetic core to be detected, and the yoke part is a part between the two column parts in the U-shaped detection device;
carrying the magnetic core to be detected to the U-shaped detection device through the two column parts, and adjusting the relative position between the magnetic core to be detected and the two column parts, 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;
and winding a first lead on the first part to be detected, and respectively connecting two ends of the first lead to corresponding ports of a magnetic property detector so that the magnetic property detector can detect the magnetic property of the magnetic core to be detected.
2. The detection method according to claim 1,
the first part to be detected is a part of the magnetic core to be detected, which is positioned 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 interval is provided between an end surface of a first column part of the two column parts and a first local part, the thickness of the first interval is 0.01mm-2mm, and the first local part is a part of the magnetic core to be detected, which is opposite to the end surface of the first column part;
the first gap is an air gap or a sheet insulator.
4. The detection method according to claim 1, wherein an end surface of a first column part of the two column parts 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 surface of the first column part;
the depth of the first groove is not larger than the height of the first local part, wherein the height direction of the first local part is vertical to the end surface of the first column part;
the gap between the part of the first part, which is positioned in the first groove, and the inner side edge of the first groove is less than 0.2 mm.
5. A nondestructive testing method for a non-annular magnetic core is characterized by comprising the following steps:
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 part and a second U-shaped detection part which are arranged separately; 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; 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;
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 located between the first column part and the third column part, a second part of the magnetic core to be detected is located between the second column part and the fourth column part, and the first part and the second part are two opposite end parts of the magnetic core to be detected; the sum of the contact area between the first local part and the first column part and the contact area between the first local 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 local part and the second column part and the contact area between the second local part and the fourth column part is larger than the effective contact area of the magnetic core to be detected;
winding a first lead on a first part to be detected, and respectively connecting two ends of the first lead to corresponding ports of a magnetic property detector so that the magnetic property detector can detect the magnetic property of the magnetic core to be detected; wherein the content of the first and second substances,
the first portion to be detected is a portion, between the first column portion and the third column portion, of the magnetic core to be detected.
6. The detection method according to claim 5, wherein the first pillar portion has a first interval from the first part; and/or the presence of a gas in the gas,
a first spacing is provided between the third pillar portion and the first part; and/or the presence of a gas in the gas,
a first interval is formed between the second column part and the second local part; and/or the presence of a gas in the gas,
the fourth pillar portion and the second local portion have a first interval therebetween;
wherein the first interval is an air gap or a sheet insulator, and the thickness of the first interval is 0.01mm-2 mm.
7. The detection method according to claim 5, wherein an end surface 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 local part, wherein the height direction of the first local part is vertical to the end surface of the first column part; the gap between the part of the first part, which is positioned in the first groove, and the inner side edge of the first groove is less than 0.2 mm; and/or the presence of a gas in the gas,
the end surface of the second column part is provided with a second groove for accommodating the second part; the depth of the second groove is not greater than the height of the second local part, wherein the height direction of the second local part is perpendicular to the end surface 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 less than 0.2 mm; and/or the presence of a gas in the gas,
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 local part, wherein the height direction of the first local part is vertical to the end surface of the third column part; the gap between the part of the first part, which is positioned in the third groove, and the inner side edge of the first groove is less than 0.2 mm; and/or the presence of a gas in the gas,
the end surface 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 local part, wherein the height direction of the second local part is vertical to the end surface of the fourth pillar part; the gap between the part of the second part, which is arranged in the fourth groove, and the inner side edge of the fourth groove is less than 0.2 mm.
8. A magnetic core detection device for nondestructively detecting the magnetic property of a non-annular magnetic core is characterized in that the magnetic core detection device is a U-shaped detection device with first magnetic property, and the first magnetic property is higher than the set magnetic property of the non-annular magnetic core;
the U-shaped detection device comprises: two limbs and a yoke portion between the two limbs; wherein a cross-sectional area at any one of each of the two legs and a cross-sectional area at any one of the yoke portions is greater than an effective cross-sectional area of the non-toroidal core;
the two column parts are used for carrying the non-annular magnetic core, and when the two column parts carry the non-annular magnetic core, the contact area between the non-annular magnetic core and each column part of the two column parts is larger than the effective sectional area of the non-annular magnetic core.
9. The apparatus according to claim 8, wherein an end surface of a first pillar portion of the two pillar portions is provided with a sheet-like insulator having a thickness of 0.01mm to 2 mm.
10. The magnetic core detection device according to claim 8, wherein an end surface of a first column part of the two column parts is provided with a first groove for accommodating a first part, the first part being a part of the non-annular magnetic core that is opposite to the end surface of the first column part when the two column parts carry the non-annular magnetic core;
the depth of the first groove is not larger than the height of the first local part, wherein the height direction of the first local part is vertical to the end surface 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 less than 0.2 mm.
11. A magnetic core detection device for nondestructively detecting the magnetic property of a non-annular magnetic core is characterized in that the magnetic core detection device is a U-shaped detection device with first magnetic property, and the first magnetic property is higher than the set magnetic property of the non-annular magnetic core;
the detection device comprises a first U-shaped detection part and a second U-shaped detection part 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 the content of the first and second substances,
in the use state of the detection device, the first column part and the third column part are oppositely arranged, and the second column part and the fourth column part are oppositely arranged; 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 end parts of the non-annular magnetic core; wherein a sum of a contact area between the first part and the first pillar portion plus a contact area between the first part and the third pillar portion is greater than an effective cross-sectional area of the non-toroidal core, and a sum of a contact area between the second part and the second pillar portion plus a contact area between the second part and the fourth pillar portion is greater than an effective contact area of the non-toroidal core.
12. The magnetic core testing device according to claim 11, wherein an end face of the first pillar portion is provided with a sheet-like insulator; and/or a sheet insulator is arranged on the end face of the second column part; and/or a sheet-shaped insulator is arranged on the end surface of the third column part; and/or a sheet-shaped insulator is arranged on the end surface of the fourth column part;
wherein the thickness of the sheet-like insulator is 0.01mm-2 mm.
13. The magnetic core detection device according to claim 11, wherein an end surface of the first pillar portion is provided with a first recess for receiving the first portion; the depth of the first groove is not larger than the height of the first local part, wherein the height direction of the first local part is vertical to the end surface of the first column part; the gap between the part of the first part, which is positioned in the first groove, and the inner side edge of the first groove is less than 0.2 mm; and/or the presence of a gas in the gas,
the end surface of the second column part is provided with a second groove for accommodating the second part; the depth of the second groove is not greater than the height of the second local part, wherein the height direction of the second local part is perpendicular to the end surface 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 less than 0.2 mm; and/or the presence of a gas in the gas,
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 local part, wherein the height direction of the first local part is vertical to the end surface of the third column part; the gap between the part of the first part, which is positioned in the third groove, and the inner side edge of the first groove is less than 0.2 mm; and/or the presence of a gas in the gas,
the end surface 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 local part, wherein the height direction of the second local part is vertical to the end surface of the fourth pillar part; the gap between the part of the second part, which is arranged in the fourth groove, and the inner side edge of the fourth groove is less than 0.2 mm.
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