CN210325400U - Circular cross section magnetic ring and theta type circular cross section magnetic ring inductor - Google Patents
Circular cross section magnetic ring and theta type circular cross section magnetic ring inductor Download PDFInfo
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- CN210325400U CN210325400U CN201920745391.8U CN201920745391U CN210325400U CN 210325400 U CN210325400 U CN 210325400U CN 201920745391 U CN201920745391 U CN 201920745391U CN 210325400 U CN210325400 U CN 210325400U
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 201
- 238000004804 winding Methods 0.000 claims abstract description 108
- 229910001289 Manganese-zinc ferrite Inorganic materials 0.000 claims description 5
- JIYIUPFAJUGHNL-UHFFFAOYSA-N [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] JIYIUPFAJUGHNL-UHFFFAOYSA-N 0.000 claims description 4
- 239000000696 magnetic material Substances 0.000 claims description 4
- 239000006247 magnetic powder Substances 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 229910000702 sendust Inorganic materials 0.000 claims description 3
- 230000005294 ferromagnetic effect Effects 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 229910000859 α-Fe Inorganic materials 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 99
- 239000010949 copper Substances 0.000 abstract description 65
- 229910052802 copper Inorganic materials 0.000 abstract description 41
- 230000003071 parasitic effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000035699 permeability Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- VAWNDNOTGRTLLU-UHFFFAOYSA-N iron molybdenum nickel Chemical compound [Fe].[Ni].[Mo] VAWNDNOTGRTLLU-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Abstract
The utility model provides a magnetic ring with a circular cross section, wherein a small segment of circular arc is cut off from the inner circle and the outer circle of the magnetic ring, and the cross section of the magnetic ring is a nearly circular shape formed by two short strings on the outer circle and the inner circle of the magnetic ring and two long circular arcs on two sides of the short strings; compared with the inductor adopting the traditional magnetic ring with the rectangular cross section, the inductor adopting the magnetic ring with the circular cross section can save the copper consumption by more than 22 percent for the inductor adopting the circular copper wire horizontal winding, and can save the copper consumption by more than 36 percent for the inductor adopting the flat copper wire vertical winding. The magnetic ring is provided with two slots in the inner circle, and the theta-shaped circular cross section magnetic ring of the magnetic bridge is embedded in the slots, so that the magnetic ring is suitable for winding a common mode inductor with parasitic differential mode inductance in an alternating current power supply EMC filter.
Description
Technical Field
The utility model relates to a technical field of the used magnetic ring product of toroidal inductor especially relates to a save consumptive material and can effectively reduce manufacturing cost's circular cross section magnetic ring.
Background
In a wide range of fields such as network communication, automatic control, electric power drive, transportation, computers, solar energy, and wind power generation, power converters (switching power supplies, uninterruptible power supplies, variable frequency power supplies, and the like) in various electronic devices and apparatuses used therein, various kinds of toroidal inductors are used in large quantities, such as: common mode inductors and differential mode inductors in EMC filters that suppress conducted electromagnetic interference, ac filter inductors that suppress harmonic currents to improve current waveforms, inductors in power factor correction circuits, dc filter inductors that reduce dc voltage ripples, and so forth.
When various toroidal inductors are manufactured, the traditional magnetic ring with the rectangular cross section is adopted at present, the mode not only ensures that the copper consumption of a winding is higher, but also has relatively complex manufacturing process, and can not meet the production requirements of high efficiency and low cost. How to better save consumables and man-hours, improve efficiency and reduce cost, expand market application range, and enable inductor products to realize important economic and environmental protection values is an important research subject of technicians in the field.
SUMMERY OF THE UTILITY MODEL
For overcoming the problem that prior art exists, the utility model provides a novel cross section is circular shape magnetic ring, replaces traditional cross section to be the magnetic ring of rectangle to improve all kinds of toroidal inductor's production efficiency, but and save the quantity of copper product. The manufacturing cost of the inductor is reduced, and the inductor has important environmental protection value.
In order to achieve the above object, an embodiment of the present invention provides a magnetic ring having a circular cross section as shown in fig. 1A (front view) and fig. 1B (half-sectional side view). Because of the limitation of the mold for pressing the magnetic ring and the process requirements, it is difficult to manufacture the magnetic ring with a full circular cross section, and actually, a small section of circular arc is cut off from the inner circle and the outer circle of the magnetic ring, and the shape of the cross section (the shaded part in fig. 1B) is a nearly circular shape formed by two short chords on the outer circle and the inner circle of the magnetic ring and two long circular arcs on two sides of the short chord.
According to different functions of various annular inductors, the material of the magnetic ring with the circular cross section can be selected from various soft magnetic materials, such as: ferrite magnetic rings, ferromagnetic powder magnetic rings, sendust magnetic powder magnetic rings, iron-nickel-molybdenum magnetic powder magnetic rings, and the like.
Preferably, the surface of the magnetic ring is sprayed with an epoxy resin insulating layer.
The magnetic ring with the circular cross section can also be provided with two grooves on the inner circle, and forms a theta-shaped magnetic core with magnetic sheets (called magnetic bridges) embedded in the grooves.
As shown in fig. 2, a magnetic bridge 201 is disposed in a slot 202 of a magnetic ring with a circular cross section, and two symmetrical common mode windings (L-L 'and N-N') are wound on both sides of the magnetic bridge, and a θ -type magnetic ring and the wound common mode windings constitute a Differential mode-common mode composite inductor (DCCC) for a single-phase alternating current EMC filter.
As shown in fig. 3, a magnetic bridge 301 is disposed in a slot 302 of a magnetic ring with a circular cross section, one side of the magnetic bridge is wound with Three phase windings (a-a ', B-B', C-C '), and the other side of the magnetic bridge is wound with a neutral winding (N-N'), a θ -type magnetic ring and the wound Four windings, so as to form a Three-phase Four-wire common-mode Differential-mode inductor (TFCDC) for a Three-phase Four-wire ac EMC filter.
The characteristics of DCCC and TFCDC are: they have both a large common-mode inductance value (L)CM) Also, a large differential-mode inductance value (L) is parasiticDM) Therefore, in the EMC filter composed of DCCC and TFCDC, the differential mode inductor is not needed any more, but still has good filtering performance (high insertion loss in common mode and differential mode, low level of conducted electromagnetic interference), and is small in size, light in weight, low in loss and low in cost.
Preferably, the material of the theta-shaped magnetic ring adopts the relative permeability muiManganese zinc ferrite of more than or equal to 7000.
Preferably, the surface of the theta-shaped magnetic ring is sprayed with an epoxy resin insulating layer.
For further understanding of the features and technical content of the present invention, please refer to the following detailed open-cut open-seam drawings and detailed description of the present invention. However, the drawings and detailed description are to be regarded as illustrative in nature and not as restrictive.
Drawings
Fig. 1A and fig. 1B are a front view and a half-sectional side view of a magnetic ring with a circular cross section according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a DCCC employing a magnetic ring with a theta-shaped circular cross section.
Fig. 3 is a schematic diagram of TFCDC using a magnetic ring of circular cross section of type θ.
Fig. 4 is a cross-sectional view of a circular cross-section magnetic loop circular copper wire level wound winding inductor.
Fig. 5 is a cross-sectional view of a square cross-section magnetic loop round copper wire level wound winding inductor.
Fig. 6 is a cross-sectional view of a circular cross-section magnetic loop flat copper wire edgewise winding inductor.
Fig. 7 is a cross-sectional view of a square cross-section magnetic loop flat copper wire edgewise winding inductor.
Fig. 8A and 8B are front and full sectional side views of a theta-type circular cross-section magnet ring for manufacturing a DCCC.
Fig. 9A and 9B are front and full sectional side views of a theta-type circular cross-section magnetic ring for manufacturing the TFCDC.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the embodiments of the present invention and the accompanying drawings. In the description, for the convenience of calculation and analysis, the nearly circular cross section of the magnetic ring is regarded as a full circular cross section, and the circumference of the coil inner circle is regarded as the length of the coil copper wire, so that the error is not large and can be ignored.
FIG. 4 is a cross-sectional view of a magnetic ring round copper wire level wound winding inductor of circular cross-section with the shaded portion being the magnetic core and the diameter of the circular cross-section of the magnetic core being D; the circle outside the magnetic core is one circle of the winding of the round copper wire, the length l of the circle of the copper wire1＝πD。
FIG. 5 is a cross-sectional view of a magnetic ring round copper wire parallel winding inductor with a square cross-section, in which the shaded portion is a magnetic core, and the side length of the square cross-section of the magnetic core is A; the square frame outside the magnetic core is one circle of the winding of the round copper wire, and the length l of the circle of the copper wire is one circle2＝4A。
Effective magnetic path length l of magnetic ring with circular cross section and magnetic ring with square cross sectione(about the average of the inner and outer circumferences of the magnetic ring) and the cross-sectional area S are equal, and the magnetic permeability is determined by the relative magnetic permeability muiThe same magnetic material is used, so that the inductance AL (AL ═ μ) of the two magnetic rings0μiS/le) Are equal. When the number of coils N of the windings is the same, the inductance L (L ═ ALN) of the two magnetic-ring inductors2) Are also equal. Now, the lengths of one circle of the round copper wire windings of the two magnetic loop inductors are compared, and the magnetic loop inductor with the square cross section is selected to be compared with the magnetic loop inductor with the circular cross section, because the perimeter of the square is the shortest in the rectangular graphs with the same area.
The side length of the square cross section of the magnetic ring is as follows: a. the
The area of the square cross section of the magnetic ring is as follows: a is2
Circle copper wire winding circle of square cross section magnetic ring inductor circle is length: l2＝4A
The area of the circular cross section of the magnetic ring is as follows:
the diameter of the circular cross section of the magnetic ring is as follows:
circle cross section magnetic ring inductor circle copper wire winding circle length of circle is:
l1＝πD
＝3.544A
the ratio of one circle length of two kinds of inductor round copper wire windings is:
l1/l2＝3.544A/4A
＝0.886
l1＝0.886l2。
therefore, when the magnetic ring with the circular cross section is adopted to replace the magnetic ring with the square cross section, the length l of one winding round copper wire of the magnetic ring inductor with the circular cross sectionCu1(≈Nl1) Length l of one winding round copper wire of square cross section magnetic ring inductorCu2(≈Nl2) The ratio ofCu1/lCu20.886. Copper consumption (weight of copper wire) W of round copper wire winding and volume S of copper wireCulCuIn direct proportion, the specific gravity of the copper material is gammaCu，W＝γCuSCulCu. When the cross-sectional area S of the round copper wire of the two inductor windingsCuThe same amount of copper used for the winding and the length l of the copper wireCuIn direct proportion, the copper amount W of the magnetic loop inductor winding with the circular cross section can be saved by about 11.4 percent. Considering that the cross section of the existing magnetic ring is mostly rectangular with unequal length and width, and the copper wire of the inductor winding can not be wound to be tightly attached to the surface of the magnetic ring, the length of the circular copper wire winding is actually one circle
Therefore, when the magnetic ring with the circular cross section is adopted to replace the traditional magnetic ring with the rectangular cross section, the usage amount of the circular copper wire of the inductor winding can be saved by more than 12%.
Resistance R of inductor windingCuLength l of copper wireCuProportional to the cross-sectional area S of the copper wireCuInversely proportional, let the resistivity of the copper material be ρCu，RCu＝ρCulCu/SCu. Because the cross-sectional areas of the copper wires are the same, when the magnetic ring with the circular cross section is adopted to replace the traditional magnetic ring with the rectangular cross section, the resistance R of the inductor winding isCuCan reduce more than 12 percent, and correspondingly, the copper consumption p of the inductor windingCu＝I2RCuThe operating current of the inductor (I in the formula) is reduced by more than 12%.
When the magnetic ring with the circular cross section is adopted to replace the magnetic ring with the square cross section, if the copper consumption of the inductor winding is selected to be kept unchanged, namely the resistance (R) of the inductor winding is kept unchangedCu1＝RCu2) The cross-sectional area of a round copper wire of the circular cross-section magnetic ring inductor winding is reduced proportionally, and the copper consumption of the winding can be further saved.
Resistance of circular cross section magnetic loop inductor winding: rCu1＝ρCulCu1/SCu1
Resistance of the square cross section magnetic loop inductor winding: rCu2＝ρCulCu2/SCu2
Keeping the resistance of the inductor winding constant, i.e.: rhoCulCu1/SCu1＝ρCulCu2/SCu2
The ratio of the cross-sectional areas of the copper wires of the two inductor windings is: sCu1/SCu2＝lCu1/lCu2＝0.886
SCu1＝0.886SCu2
The ratio of the copper used for the two inductor windings is: w1/W2＝γCuSCu1lCu1/γCuSCu2lCu2
＝0.886×0.886
＝0.785
W1＝0.785W2。
Therefore, when the magnetic ring with the circular cross section is adopted to replace the magnetic ring with the square cross section and the inductance value and the copper consumption of the inductor winding are kept unchanged, the copper amount W of the inductor winding of the magnetic ring with the circular cross section is used1Copper volume W for square cross section magnetic loop inductor winding278.5%, i.e. the amount of copper used in the winding can be saved by about 21.5%. Considering that the cross section of the existing magnetic ring is mostly rectangular with unequal length and width, the copper wire of the inductor winding can not be wound to be tightly attached to the surface of the magnetic ring, and the length of the winding copper wire is actually larger than that of the inductor winding copper wire of the magnetic ring with the square cross section, therefore, when the magnetic ring with the circular cross section is adopted to replace the traditional magnetic ring with the rectangular cross section, the using amount of the circular copper wire of the inductor winding can be saved by over 22 percent.
FIG. 6 is a cross-sectional view of a magnetic ring flat copper wire edgewise winding inductor of circular cross-section with the shaded portion being the magnetic core and the diameter of the circular cross-section of the magnetic core being D; the circle outside the magnetic core is a circle of the edgewise winding of the rectangular copper wire, the length l of the rectangular copper wire1＝πD。
FIG. 7 is a cross-sectional view of a magnetic ring flat copper wire vertically wound winding inductor with a square cross-section, in which the shaded portion is a magnetic core, and the side length of the square cross-section of the magnetic core is A; the circle outside the magnetic core is a circle of the edgewise winding of the flat copper wire, and the diameter of the inner circle of the circle (namely the diagonal of the square) is
Length of coil flat copper wire
Effective magnetic path length l of magnetic ring with circular cross section and magnetic ring with square cross sectione(about the average of the inner and outer circumferences of the magnetic ring) and the cross-sectional area S are equal, and the magnetic permeability is determined by the relative magnetic permeability muiOf the same magnetic material, as described above, when the winding is woundThe coil numbers N are the same, and inductance coefficients AL (AL ═ mu) of the two coil loops are the same0μiS/le) And inductance L (L ═ ALN) of the inductor2) Are equal. The lengths of the two magnetic loop inductor flat copper wire windings in a vertical winding circle are compared.
The side length of the square cross section of the magnetic ring is as follows: a. the
The area of the square cross section of the magnetic ring is as follows: a is2
Circle's length is for square cross section magnetic ring inductor rectangular copper wire winding: l2＝4.443A
The area of the circular cross section of the magnetic ring is as follows:
the diameter of the circular cross section of the magnetic ring is as follows:
circle cross section magnetic ring inductor rectangular copper wire winding circle's length is:
l1＝πD
＝3.544A
the ratio of one circle length of two kinds of inductor rectangular copper wire windings is:
l1/l2＝3.544A/4.443A
＝0.798
l1＝0.798l2。
therefore, when the magnetic ring with the circular cross section is adopted to replace the magnetic ring with the square cross section, the length (l) of one winding flat copper wire of the magnetic ring inductor with the circular cross section is equal to that of the winding flat copper wireCu1≈Nl1) Length of one winding flat copper wire for a magnetic loop inductor with square cross sectionCu2≈Nl2) 79.8% of; the copper consumption (weight of copper wire) of the flat copper wire winding is in direct proportion to the volume of the copper wire, and the cross-sectional area S of the copper wireCuMeanwhile, the copper consumption of the winding is in direct proportion to the length of the copper wire, so that the copper consumption of the winding can be saved by about 20 percent.
Taking into account the existing magnet ringThe cross section is mostly rectangular with unequal length of long and wide sides, and the circular ring-shaped inductor winding can not be wound to make four corners (which can damage insulation) tightly attached to the magnetic ring, and actually the length l of a ring of the flat copper wire winding2The usage amount of the flat copper wire of the inductor winding can be saved by more than 20% when the magnetic ring with the circular cross section is adopted to replace the traditional magnetic ring with the rectangular cross section.
When the magnetic ring with the circular cross section is adopted to replace the magnetic ring with the square cross section, if the copper consumption of the inductor winding is selected to be kept unchanged, namely the resistance (R) of the inductor winding is kept unchangedCu1＝RCu2) The cross-sectional area of the flat copper wire of the circular cross-section magnetic ring inductor winding is reduced proportionally, and the copper consumption of the winding can be further saved.
Keeping the resistance of the inductor winding constant, i.e.: rhoCulCu1/SCu1＝ρCulCu2/SCu2
The ratio of the cross-sectional areas of the copper wires of the two inductor windings is: sCu1/SCu2＝lCu1/lCu2＝0.798
SCu1＝0.798SCu2
The ratio of the copper amount used by the two inductor windings is as follows: w1/W2＝γCuSCu1lCu1/γCuSCu2lCu2
＝0.798×0.798
＝0.637
W1＝0.637W2。
Therefore, when the magnetic ring with the circular cross section is adopted to replace the magnetic ring with the square cross section and the copper consumption of the inductor winding is kept unchanged, the copper amount W of the inductor winding of the magnetic ring with the circular cross section is used1Copper volume W for square cross section magnetic loop inductor winding263.7%, namely, the usage of the winding flat copper wire can be saved by about 36%. Considering that the cross section of the existing magnetic ring is mostly rectangular with different lengths of long and wide sides, and the circular ring-shaped inductor winding can not be wound to form four corners (which can damage insulation) tightly attached to the magnetic ring, the length of the winding copper wire is actually larger than that of the square cross section magnetic ring inductor winding copper wireThe length of the inductor winding is reduced by over 36% when the magnetic ring with the circular cross section is used for replacing the traditional magnetic ring with the rectangular cross section.
The embodiment of the utility model has the advantages that:
when various toroidal inductors are adopted, the utility model provides a circular cross section magnetic ring replaces traditional rectangular cross section magnetic ring, at the effective magnetic path length l of magnetic ringeEqual to the cross-sectional area S of the magnetic circuit, same material, same inductance AL value, same coil number N of the inductor winding and equal inductance L, and maintains copper consumption pCuUnder the unchangeable prerequisite, can bring following beneficial effect:
1. compared with the round copper wire horizontal winding inductor adopting the magnetic ring with the rectangular cross section, the round copper wire horizontal winding inductor adopting the magnetic ring with the circular cross section can save the copper consumption of the winding by more than 22 percent.
2. Compared with the flat copper wire vertically-wound winding inductor adopting the magnetic ring with the rectangular cross section, the flat copper wire vertically-wound winding inductor adopting the magnetic ring with the circular cross section can save the copper consumption of the winding by more than 36 percent.
3. Compared with the flat copper wire vertical winding inductor adopting the magnetic ring with the rectangular cross section, the flat copper wire vertical winding inductor adopting the magnetic ring with the circular cross section has the advantages that the flat copper wire can be tightly attached to the surface of the magnetic ring to wind the winding, so that the winding process of the winding is simplified, the magnetic core and winding integrated inductor is convenient to install, and the working time cost is saved.
4. Comparing fig. 6 and fig. 7, it can be seen that the outer diameter and height of the edgewise winding inductor of flat copper wire with circular cross section magnetic ring are small, so that the volume is small compared with the edgewise winding inductor of flat copper wire with rectangular cross section magnetic ring.
The inductors DCCC and TFCDC wound by the magnetic ring with the theta-shaped circular cross section have the following beneficial effects besides the beneficial effects described in the first step: DCCC and TFCDC not only have large common-mode inductance value (L)CM) And also parasitic with large differential-mode inductance (L)DM) Therefore, in the single-phase EMC filter composed of DCCC and the three-phase EMC filter composed of TFCDCIn the four-wire EMC filter, a differential mode inductor is not needed any more, but the four-wire EMC filter still has good filtering performance (high common mode and differential mode insertion loss and low conducted electromagnetic interference level), and is small in size, light in weight, low in loss and low in cost.
Fig. 8A and 8B are examples of a design of a magnetic ring with a θ -shaped circular cross section according to an embodiment of the present invention. As shown, the outer diameter D of the magnetic ringo60mm, inner diameter D of the magnet ringiThe diameter D of the circular cross section of the magnetic ring is 16.5mm, and the length multiplied by the width multiplied by the thickness of the magnetic bridge is 39.8 multiplied by 16.5 multiplied by 2.5 mm. The magnetic ring and the magnetic bridge are made of mui7000 + -30% high permeability manganese zinc ferrite. After two common mode windings (L-L 'and N-N') are wound around the θ -type core, a differential mode-common mode composite inductor (abbreviated as DCCC) for a single-phase ac EMC filter is manufactured as shown in fig. 2.
Fig. 9A and 9B are examples of the design of a magnetic ring with a θ -shaped circular cross section according to another embodiment of the present invention. As shown, the outer diameter D of the magnetic ringo100mm, inner diameter D of the magnet ringi48mm, the diameter D of the circular cross section of the magnetic ring is 28mm, and the length multiplied by the width multiplied by the thickness of the magnetic bridge is 49.8 multiplied by 28 multiplied by 3.4 mm. The magnetic ring and the magnetic bridge are made of mui7000 + -30% high permeability manganese zinc ferrite. After three phase wire windings (A-A ', B-B', C-C ') and a neutral wire winding (N-N') are wound on the theta-shaped magnetic core, a three-phase four-wire common mode-differential mode inductor (TFCDC for short) for the three-phase four-wire alternating current EMC filter is manufactured as shown in FIG. 3.
The above is the detailed description of the present invention, and does not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. A circular cross section magnetic ring which is characterized in that: the cross section of the magnetic ring is composed of two short chords on the excircle and the inner circle of the magnetic ring and two long arcs on two sides of the short chords.
2. A circular cross-section magnet ring as claimed in claim 1, wherein: and an epoxy resin insulating layer is sprayed on the surface of the magnetic ring.
3. A circular cross-section magnet ring as claimed in claim 1, wherein: the magnetic ring is made of different soft magnetic materials according to different functions of various toroidal inductors, and is made into a ferrite magnetic ring, a ferromagnetic powder magnetic ring, a sendust magnetic powder magnetic ring or a sendust magnetic powder magnetic ring.
4. A magnetic ring inductor with a theta-shaped circular cross section is characterized in that: a differential-mode and common-mode composite inductor for a single-phase alternating current EMC filter comprising a magnetic ring of circular cross section as claimed in claim 1 or 2, and having two slots in radial direction of the magnetic ring, magnetic sheets called magnetic bridges being embedded, and two symmetrical common-mode windings L-L 'and N-N' being wound on the magnetic ring on both sides of the magnetic bridge.
5. The magnetic loop inductor with the theta-shaped circular cross section as claimed in claim 4, wherein: the magnetic ring is made of manganese zinc ferrite with the relative magnetic conductivity mu i more than or equal to 7000.
6. A magnetic ring inductor with a theta-shaped circular cross section is characterized in that: the three-phase four-wire common mode-difference inductor for the three-phase four-wire alternating current EMC filter is formed by the steps of forming a magnetic ring with a circular cross section as claimed in claim 1 or 2, forming two slots on one side of the magnetic ring, embedding magnetic sheets called a magnetic bridge, winding three phase wire windings A-A ', B-B' and C-C 'on one side of a long circular arc and winding a center wire winding N-N' on one side of a short circular arc on two sides of the magnetic ring on the two sides of the magnetic bridge.
7. The magnetic loop inductor with the theta-shaped circular cross section as claimed in claim 6, wherein: the magnetic ring is made of manganese zinc ferrite with the relative magnetic conductivity mu i more than or equal to 7000.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920745391.8U CN210325400U (en) | 2019-05-23 | 2019-05-23 | Circular cross section magnetic ring and theta type circular cross section magnetic ring inductor |
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|---|---|---|---|
| CN201920745391.8U CN210325400U (en) | 2019-05-23 | 2019-05-23 | Circular cross section magnetic ring and theta type circular cross section magnetic ring inductor |
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| CN201920745391.8U Active CN210325400U (en) | 2019-05-23 | 2019-05-23 | Circular cross section magnetic ring and theta type circular cross section magnetic ring inductor |
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