JP4634662B2 - Non-contact transmission coupler - Google Patents

Non-contact transmission coupler Download PDF

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Publication number
JP4634662B2
JP4634662B2 JP2001209347A JP2001209347A JP4634662B2 JP 4634662 B2 JP4634662 B2 JP 4634662B2 JP 2001209347 A JP2001209347 A JP 2001209347A JP 2001209347 A JP2001209347 A JP 2001209347A JP 4634662 B2 JP4634662 B2 JP 4634662B2
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Prior art keywords
magnetic
core
non
transmission coupler
annular groove
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JP2001209347A
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JP2003022921A (en
Inventor
文昭 中尾
幹雄 北岡
浩 坂本
克夫 山田
良夫 松尾
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Fdk株式会社
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Priority to JP2001209347A priority Critical patent/JP4634662B2/en
Priority claimed from US10/467,871 external-priority patent/US7218196B2/en
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic coupling type non-contact transmission coupler, for example, to a technique effective when used for non-contact power supply and charging to an electric vehicle or an electric device.
[0002]
[Prior art]
Magnetic coupling-type non-contact transmission couplers are provided as means for non-contact power supply and charging to electric vehicles, electric bicycles, and other electric devices. As shown in FIG. 5, the non-contact transmission coupler can be configured using a disk-shaped magnetic core 1 ′ having an annular groove for winding.
[0003]
FIG. 5 shows a configuration example of a conventional non-contact transmission coupler. In the same figure, (A) is a broken perspective view of the magnetic core 1 ′, (B) is a plan view thereof, (C) is a sectional view of a non-contact transmission coupler using the core 1 ′, and (D) is an equivalent thereof. Each circuit diagram is shown. In the figure, magnetic cores 1 'and 1' are integrally formed in a disk shape using a ferrite magnetic material or the like. An annular groove 12 for winding the coils L1 and L2 is formed on one surface of the disk-shaped magnetic core 1 ', and a U-shaped open magnetic path is formed around the annular groove 12. ing. The inner side of the annular groove 12 forms a circular table-shaped middle leg portion 11 to form one magnetic pole surface of the U-shaped open magnetic path, and the outer side forms an annular outer leg portion 13 to form the U-shaped open magnetism. The other pole face of the path is formed.
[0004]
In the non-contact transmission coupler, the magnetic pole surfaces of a pair of magnetic cores 1 'and 1' wound with coils L1 and L2 are placed close to each other so that each of the cores 1 'and 1' is opened. The paths are coupled to each other with a gap (space magnetic path) interposed therebetween to form an annular closed magnetic path B. And by this closed magnetic circuit B, alternating current (high frequency) electric power can be transmitted from the coil L1 of one core 1 'to the coil L2 of the other core 1'. In this case, one core 1 'and the coil L1 function corresponding to the primary side of the transformer, and the other core 1' and the coil L2 function corresponding to the secondary side thereof (see Japanese Patent Application Laid-Open No. 2000-2000). 150273).
[0005]
In order to increase the power transmission efficiency in the above-described contactless transmission coupler, it is necessary to close the magnetic coupling between the primary side and the secondary side. That is, it is necessary to secure a magnetic coupling coefficient as high as possible between the primary and secondary. Therefore, conventionally, the magnetic coupling between the cores 1 ′ and 1 ′ has been maximized by increasing the area (magnetic pole area) of the portion serving as the magnetic pole of the core 1 ′ as much as possible. This is because the larger the opposing magnetic pole areas, the closer the magnetic coupling. For this reason, the cores 1 'and 1' are formed so as to have a solid magnetic pole area as large as possible as well as a solid integrated structure with no gaps (so-called solid structure).
[0006]
[Problems to be solved by the invention]
The conventional non-contact transmission coupler described above is configured to optimize the magnetic coupling state when the positions of both the primary and secondary cores 1 'and 1' are accurately superimposed. No particular consideration has been given to the reduction in coupling coefficient that occurs when misalignment (lateral misalignment) occurs in alignment. For this reason, when feeding and charging an electric vehicle or the like using the coupler without contact, it is necessary to accurately align both the primary and secondary cores 1 ′ and 1 ′. However, this significantly impairs the usability of the contactless transmission coupler. In order to perform the above alignment accurately, it is conceivable to use a dedicated positioning coupling device. However, this makes it easier to use than a normal contact connector, and the advantages of a non-contact transmission coupler Will be lost.
[0007]
The present invention has been made in view of the above problems, and an object thereof is to improve usability by providing a margin for core alignment between the primary side and the secondary side of the non-contact transmission coupler. .
[0008]
[Means for Solving the Problems]
The present invention provides the following solutions. In other words, a pair of disk-shaped magnetic cores having an annular groove for coil winding on one side are opposed to each other so that the surfaces on the annular groove side face each other, thereby magnetically coupling the coil of one core to the coil of the other core. A non-contact transmission coupler configured to perform power transmission according to claim 1, wherein a difference between a diameter of a middle foot portion located inside the annular groove and a width of the annular groove is within ± 20%. To do.
[0009]
Further, in the above means, if the difference between the magnetic pole area formed by the middle foot portion and the magnetic pole area formed by the annular outer foot portion located outside the annular groove is within ± 20%, Good magnetic path balance can be obtained and core loss can be minimized.
[0010]
The magnetic core may be a disk-shaped integrated magnetic core, or may be formed by a plurality of divided cores so as to form a disk-shaped outline as a whole. Further, when the magnetic core is formed by a plurality of divided cores so as to form a disk-like outline as a whole, a fan-shaped gap can be placed between the divided cores. With the fan-shaped gap, the core can be reduced, and the effect of maintaining a high magnetic coupling coefficient at the time of displacement can be obtained.
[0011]
The magnetic core can be formed of a ferrite magnetic material. Further, by chamfering the non-opposing corner portion of the magnetic core, the core can be further reduced in weight, and breakage at the edge portion of the core can be made difficult to occur.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of a contactless transmission coupler according to the present invention. In the same figure, (A) is a broken perspective view of the magnetic core 1, (B) is a plan view thereof, (C) is a sectional view of a non-contact transmission coupler using the core 1, and (D) is an equivalent circuit diagram thereof. Respectively.
[0013]
The coupler shown in the figure is basically the same as the above-described conventional one, in which the magnetic pole surfaces of a pair of magnetic cores 1 and 1 wound with coils L1 and L2 are placed close to each other. . The open magnetic paths formed by the cores 1 and 1 are coupled to each other with a gap (space magnetic path) therebetween, thereby forming an annular closed magnetic path. And by this closed magnetic circuit, the alternating current (high frequency) electric power is transmitted from the coil L1 of one core 1 to the coil L2 of the other core 1.
[0014]
The magnetic core 1 is integrally formed in a disk shape using a ferrite magnetic material or the like. An annular groove 12 for winding the coils L1 and L2 is formed on one surface of the disk-shaped magnetic core 1, and a U-shaped open magnetic path is formed around the annular groove 12. Yes. The inner side of the annular groove 12 forms a circular table-shaped middle leg portion 11 to form one magnetic pole surface of the U-shaped open magnetic path, and the outer side forms an annular outer leg portion 13 to form the U-shaped open magnetism. The other pole face of the path is formed.
[0015]
Here, the coupler of the embodiment shown in FIG. 1 is configured such that the diameter a of the middle foot portion 11 and the width b of the annular groove 12 are substantially equal. Conventionally, because of increasing the magnetic coupling coefficient when the primary and secondary cores are opposed to each other, the annular groove that does not form the magnetic pole face can ensure only the necessary width as a coil winding space, Therefore, although the width b is considerably smaller than the diameter a of the middle foot portion (a> b), in the embodiment shown in FIG. 1, the width b of the annular groove 12 is substantially the same as the diameter a of the middle foot portion 11. It is a dimension (a = b). That is, in the non-contact transmission coupler of the present invention, the annular groove width b of the core 1 is relatively greatly increased as compared with the conventional one.
[0016]
If the width b of the annular groove 12 is relatively large, the diameter a of the middle foot portion 11 is relatively small, so that the magnetic pole area of the core 1 is reduced. This reduction in the magnetic pole area has been conventionally thought to reduce the primary / secondary magnetic coupling coefficient. However, according to the present inventors, the annular groove width b and the midfoot diameter a are substantially equal. It is found that the magnetic coupling coefficient does not decrease so much at the same place, and even if a positional deviation occurs between the cores 1 and 1 on the primary side and the secondary side, the decrease in the magnetic coupling coefficient due to the positional deviation can be reduced. did. That is, by making the annular groove width b and the midfoot diameter a of the core 1 substantially equal, the core alignment between the primary side and the secondary side of the non-contact transmission coupler can be given a margin width to improve usability. it can.
[0017]
FIG. 2 shows the change state of the magnetic coupling coefficient with respect to the positional deviation of the cores 1 and 1 for each core shape. As shown in the figure, the conventional contactless transmission coupler in which the annular groove width b of the core 1 is formed narrower than the midfoot diameter a is obtained when the positions of the primary / secondary cores are accurately overlapped. Although a relatively high magnetic coupling coefficient can be obtained, if a deviation occurs in the alignment, the magnetic coupling coefficient rapidly decreases due to the deviation. On the other hand, the non-contact transmission coupler according to the present invention in which the annular groove width b of the core is formed to be substantially the same as the midfoot diameter a can reduce the magnetic coupling coefficient due to the deviation even if the cores 1 and 1 are misaligned. The decline is relatively slow. Thereby, even if some misalignment occurs in the alignment of the cores 1 and 1, it is possible to obtain a magnetic coupling state that does not hinder practical use and to perform non-contact power transmission with high efficiency.
[0018]
As shown in FIG. 2, the change state of the magnetic coupling coefficient with respect to the positional deviation is optimized when the core midfoot diameter a and the annular groove width b are substantially equal (a = b). It has been found that a positional deviation allowable width that does not impede practical use can be obtained until the relationship between a and the annular groove width b is a = b ± 20%.
[0019]
As the reason why the above-described effect, that is, the positional deviation allowable width is obtained, for example, as shown in FIG. 3, the middle foot portion 11 of one core 1 out of the pair of cores 1 and 1 opposed to each other is displaced. When it comes to the position which straddles the annular groove 12 of the other core 1 by (h), as shown by the arrow in the figure, the magnetic flux B from the middle foot part 11 of one core 1 This is probably because a closed magnetic path is formed so as to return from the outer foot portion 13 through the middle foot portion 11 to the middle foot portion 11 of one core 1. In order to form such a closed magnetic path, a dimensional relationship in which the middle foot portion 11 of one core 1 straddles the annular groove 12 of the other core 1, that is, the middle foot diameter a and the annular groove width b. The core shape is optimal so that is substantially the same.
[0020]
Furthermore, in the non-contact transmission coupler of the embodiment shown in FIG. 1, in addition to the above-described configuration, the magnetic pole area (S1) formed by the middle foot portion 11 of the core 1 and the magnetic pole area formed by the annular outer foot portion 13 (S2) is configured to be substantially equal. That is, the area S1 on the upper end surface of the middle foot portion 11 and the area S2 on the upper end surface of the outer foot portion 13 are made substantially equal (S1 = S2). Thereby, the cross-sectional area of the annular closed magnetic path formed by both the primary and secondary cores 1 and 1 is equalized over the entire magnetic path length, and the change in the magnetic flux distribution in the closed magnetic path can be reduced. That is, it is possible to obtain a good magnetic path balance with small variations in magnetic flux density in the closed magnetic path. It is known that the core loss increases in proportion to about 2.4 power of the magnetic flux density. Therefore, if a good magnetic path balance state can be obtained, the core loss can be reduced. Furthermore, in the case of the above-described core shape (a = b ± 20%), the ratio occupied by the annular groove 12 can be increased as compared with the conventional one. Therefore, the effect of reducing the core 1 can also be obtained.
[0021]
In order to make the area S1 of the middle foot 11 equal to the area S2 of the outer foot 14, the outer diameter D of the core 1 and the diameter a of the middle foot 11 may be determined as follows.
That is, when the diameter a of the middle foot portion 11 is equal to the width b of the annular groove 12 (a = b), the area S1 of the middle foot portion 11 and the area S2 of the outer foot portion 13 are expressed by the following equations (1) (2 ).
[0022]
S1 = (a / 2) 2 · π (1)
S2 = {(D / 2) 2 − (3a / 2) 2 } · π (2)
In order to make S1 = S2 by the above formulas (1) and (2), a for D may be determined as follows.
a 2/4 = D 2 / 4-9a 2/4
10a = D 2
a 2 = D 2/10
if a = b, a and b, respectively, may be set such that the square root of D 2/10. The above formulas (1) and (2) are conditions for obtaining the optimum state. In fact, even if an error of up to ± 20% is allowed for the numerical values given from the above formulas (1) and (2), It has been found that almost the same effect can be obtained.
[0023]
In the coupler according to the above-described embodiment, a disk-shaped integrated magnetic core is used. However, in the present invention, as shown in FIG.
[0024]
FIG. 4 shows another embodiment of a contactless transmission coupler according to the present invention. In the non-contact transmission coupler of this embodiment, as shown in (A), (B), and (C) of the figure, the magnetic cores 1 and 1 on the primary side and the secondary side are respectively fan-shaped (opening = 60 degrees). The core members 1A, 1B, and 1C are formed, and fan-shaped gaps (g = 60 degrees) having the same shape as the core members are interposed between the core members 1A, 1B, and 1C. Each core member 1A, 1B, 1C is formed with a partial annular groove 12 'on one side surface so as to form a U-shaped open magnetic path.
[0025]
The primary-side core members 1A, 1B, and 1C and the secondary-side core members 1A, 1B, and 1C are closely opposed to each other on the open magnetic surface side to form an annular closed magnetic circuit B, thereby forming the primary coil L1. And a non-contact transmission coupler that performs alternating current (high frequency) power transmission between the secondary coil L2. In this case, both the primary side and secondary side core members 1A-1A, 1B-1B, and 1C-1C are magnetically coupled in pairs, thereby being shown in (D) or (E) of FIG. Such a transformer equivalent circuit is formed.
[0026]
In this manner, the magnetic cores 1 and 1 on the primary side and the secondary side are divided and formed, and a gap (g) that forms a spatial magnetic path (magnetic path formed in the space) between the divided formation portions. A non-contact transmission coupler with a gap interposed therebetween is formed. This non-contact transmission coupler can reduce the weight of the cores 1 and 1 by the fan-shaped gap (g = 60 degrees).
[0027]
The non-opposing corner portions of the core members 1A, 1B, and 1C are chamfered in advance. Reference numeral 3 indicates the chamfered portion. By forming the chamfered portion 3, the cores 1 and 1 are further reduced in weight, and breakage at the edge portion of the core is less likely to occur. Ferrite magnetic bodies manufactured by pressure molding and firing are mainly used for the core members, but since these ferrite magnetic bodies are generally brittle, the edge of the core member is likely to break during manufacture, transportation or assembly. However, the chamfered portion 3 is also effective in preventing breakage. Furthermore, large ferrite cores are difficult to uniformly apply pressure during pressure molding and have manufacturing difficulties such that cracks are likely to occur during firing. The problem can be solved by forming in a divided manner.
[0028]
In addition, when the primary and secondary magnetic cores 1 and 1 are divided and formed, the magnetic coupling between the primary core 1 and the secondary core 1 is performed from the upper, lower, left, and right directions. The effective facing area of the cores 1 and 1 between the primary side and the secondary side is enlarged, and the effective facing area is maintained even in the case of positional deviation. That is, even if the area where the core portions directly face each other due to the misalignment of the core is reduced, the magnetic coupling between the primary side and the secondary side can be favorably maintained. As a result, the non-contact transmission coupler can be reduced in weight while ensuring its performance, and the positioning of the primary side and the secondary side of the non-contact transmission coupler is further increased to further improve the usability. Can be improved.
[0029]
As described above, the disk-shaped magnetic cores 1 and 1 according to the present invention also include a core in which a plurality of core members 1A, 1B, and 1C are formed so as to form a disk-shaped outline as a whole while leaving a gap g.
[0030]
As mentioned above, although this invention was demonstrated based on the Example, this invention can have various embodiment besides the above. The present invention can also be used as a signal transmission coupler in addition to a power transmission coupler.
[0031]
【The invention's effect】
In the present invention, a pair of disk-shaped magnetic cores having an annular groove for coil winding on one side face each other so that the surfaces on the annular groove side face each other, so that the coil of one core is changed to the coil of the other core. A non-contact transmission coupler configured to perform power transmission by magnetic coupling, wherein the diameter of the middle foot located inside the annular groove is substantially the same as the width of the annular groove, so that non-contact Usability can be improved by providing a margin for core alignment between the primary side and the secondary side of the transmission coupler.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of a contactless transmission coupler according to the present invention.
FIG. 2 is a characteristic diagram showing a change state of a magnetic coupling coefficient with respect to a core position shift.
FIG. 3 is a diagram showing a magnetic coupling state when a positional deviation occurs.
FIG. 4 is a diagram showing another embodiment of a contactless transmission coupler according to the present invention.
FIG. 5 is a diagram illustrating a configuration example of a conventional non-contact transmission coupler.
[Explanation of symbols]
1 Magnetic core (present invention)
1 'Magnetic core (conventional)
1A, 1B, 1C Split core member 11 Middle foot portion 12 Annular groove 12 ′ Partial annular groove 13 Outer foot portion L1 Primary coil L2 Secondary coil 3 Chamfered portion a Middle foot diameter b Annular groove width D Core outer diameter B Magnetic path g Gap h between core members Misalignment

Claims (7)

  1. Power by magnetic coupling from one core coil to the other core coil by facing a pair of disk-shaped magnetic cores having an annular groove for coil winding on one side so that the surface on the annular groove side faces each other A non-contact transmission coupler configured to perform transmission, wherein a difference between a diameter of a middle foot portion located inside the annular groove and a width of the annular groove is within ± 20%. Contact transmission coupler.
  2. The contactless transmission coupler according to claim 1, wherein a difference between a magnetic pole area formed by the middle foot portion and a magnetic pole area formed by the outer foot portion is within ± 20%.
  3. 3. The non-contact transmission coupler according to claim 1, wherein the magnetic core is a disc-shaped integrated magnetic core.
  4. 3. The non-contact transmission coupler according to claim 1, wherein the magnetic core is formed by a plurality of divided cores so as to form a disk-like outer shape as a whole.
  5. The invention according to any one of claims 1 , 2, and 4 , wherein the magnetic core is formed by a plurality of divided cores so as to form a disk-shaped outline as a whole, and a fan-shaped gap is provided between the divided cores. A non-contact transmission coupler characterized by the above.
  6. Non-contact transmission coupler as in one of claims 1 to 5, wherein the magnetic core is characterized in that it is formed of a ferrite magnetic material.
  7. Non-contact transmission coupler as in one of claims 1 to 6, the non-opposing side corner portion of the magnetic core, characterized in that it is chamfered.
JP2001209347A 2001-07-10 2001-07-10 Non-contact transmission coupler Active JP4634662B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2001209347A JP4634662B2 (en) 2001-07-10 2001-07-10 Non-contact transmission coupler
US10/467,871 US7218196B2 (en) 2001-02-14 2002-02-14 Noncontact coupler
PCT/JP2002/001257 WO2002065493A1 (en) 2001-02-14 2002-02-14 Noncontact coupler

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JP4634662B2 true JP4634662B2 (en) 2011-02-23

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2584010C1 (en) * 2014-12-30 2016-05-20 Открытое акционерное общество "Авангард" Induction rotating transformer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6399511A (en) * 1986-06-17 1988-04-30 Tokyo Keiki Co Ltd Magnetic inductive coupling device
JPH0231405A (en) * 1988-07-21 1990-02-01 Kawasaki Heavy Ind Ltd Electric connector
JPH11136869A (en) * 1997-10-27 1999-05-21 Harness Syst Tech Res Ltd Electric vehicle charging connector
JP2000150273A (en) * 1998-11-05 2000-05-30 Densei Lambda Kk Transformer for non-contact power supply

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6399511A (en) * 1986-06-17 1988-04-30 Tokyo Keiki Co Ltd Magnetic inductive coupling device
JPH0231405A (en) * 1988-07-21 1990-02-01 Kawasaki Heavy Ind Ltd Electric connector
JPH11136869A (en) * 1997-10-27 1999-05-21 Harness Syst Tech Res Ltd Electric vehicle charging connector
JP2000150273A (en) * 1998-11-05 2000-05-30 Densei Lambda Kk Transformer for non-contact power supply

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