JPH0140170Y2 - - Google Patents
Info
- Publication number
- JPH0140170Y2 JPH0140170Y2 JP15042983U JP15042983U JPH0140170Y2 JP H0140170 Y2 JPH0140170 Y2 JP H0140170Y2 JP 15042983 U JP15042983 U JP 15042983U JP 15042983 U JP15042983 U JP 15042983U JP H0140170 Y2 JPH0140170 Y2 JP H0140170Y2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic pole
- yig
- bit
- magnetic field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000005291 magnetic effect Effects 0.000 claims description 58
- 230000005284 excitation Effects 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 239000000696 magnetic material Substances 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 229910000889 permalloy Inorganic materials 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000002223 garnet Substances 0.000 description 1
- MTRJKZUDDJZTLA-UHFFFAOYSA-N iron yttrium Chemical compound [Fe].[Y] MTRJKZUDDJZTLA-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Description
【考案の詳細な説明】
この考案は、YIGフイルタ、YIG発振器等を総
称しているYIG装置において、YIG球に直流磁界
を印加するときに使用されるビツタ形電磁石に関
するものである。[Detailed description of the invention] This invention relates to a bit-type electromagnet used when applying a DC magnetic field to a YIG sphere in a YIG device, which collectively refers to a YIG filter, a YIG oscillator, etc.
YIG（YTTRIUM IRON GARNET）球を共
振素子とする共振器では、その共振周波数がYIG
球に印加する直流磁界に比例すすることが知られ
ている。したがつて、この直流磁界の強度を外部
から変化できるようにした電磁石を使用して中心
周波数を制御できる周波数可変帯域フイルタが構
成できる。 In a resonator that uses a YIG (YTTRIUM IRON GARNET) sphere as a resonant element, its resonant frequency is YIG
It is known that the magnetic field is proportional to the DC magnetic field applied to the sphere. Therefore, it is possible to construct a variable frequency band filter whose center frequency can be controlled using an electromagnet that allows the strength of the DC magnetic field to be changed externally.
従来、かゝるYIG球には、パーマロイ等の強磁
性体金属を磁極とし、外部を磁性体で包囲した、
いわゆるビツタ形電磁石の空気間隙にYIG球を配
置することによつて直流磁界を与えていた。 Conventionally, such YIG balls have magnetic poles made of ferromagnetic metal such as permalloy, and the outside is surrounded by magnetic material.
A DC magnetic field was applied by placing a YIG sphere in the air gap of a so-called bitta-type electromagnet.
第１図は従来のビツタ形電磁石の磁気構造を断
面図でしたもので、１及び２は中心に円柱状の磁
極部１ａ，２ａを設け、該磁極部１ａ，２ａを包
囲する底部１ｂ，２ｂ、及び外周部１ｃ，２ｃか
らら構成されているつぼ形の磁気部材、３は前記
磁気部材１，２を対向した時磁極部１ａ，２ａに
空気間隙ｇ（磁気ギヤツプ）が形成されるように
保持するスペーサ（磁性体）である。 Fig. 1 is a cross-sectional view of the magnetic structure of a conventional bit type electromagnet, and 1 and 2 are provided with cylindrical magnetic pole parts 1a and 2a at the center, and bottom parts 1b and 2b surrounding the magnetic pole parts 1a and 2a. , and a pot-shaped magnetic member 3 consisting of outer peripheral parts 1c and 2c, which is held so that an air gap g (magnetic gap) is formed between the magnetic pole parts 1a and 2a when the magnetic members 1 and 2 are opposed to each other. It is a spacer (magnetic material) that
４ａ，４ｂは前記磁気部材１，２を励磁するコ
イルであつて、このコイル４ａ，４ｂに流す電流
値によつて空気間隙ｇの直流磁界強度を可変とす
ることができる。なお、５は前記空気間隙ｇに配
置されているYIG球を示し、このYIG球５は、通
常、複数個が誘導結合され、かつ、同軸線６によ
つて外部の装置と結合されるものである。 Coils 4a and 4b excite the magnetic members 1 and 2, and the strength of the DC magnetic field in the air gap g can be made variable by changing the current value passed through the coils 4a and 4b. In addition, 5 indicates a YIG ball arranged in the air gap g, and this YIG ball 5 is usually a plurality of YIG balls 5 that are inductively coupled and connected to an external device by a coaxial line 6. be.
YIG装置に使用されるこのような電磁石は、外
部磁界の影響からのがれることができ、直流磁界
の強さも任意に変化させることができるが、
１ YIG装置は測定器、通信機等の内部に置かれ
るため、外形寸法が小さいこと、
２ 電磁石に印加する電流対共振周波数の直線性
がよいこと、
等の条件が要求される。 Such electromagnets used in YIG devices can escape from the influence of external magnetic fields and can arbitrarily change the strength of the DC magnetic field. Since the electromagnet is placed at
ところが、上述した第１図の構造の電磁石では
１の条件を満すため外形を小形にすると、２の条
件である電流対共振周波数の直線性の悪化、すな
わち、空気間隙ｇの直流磁界の強さと励磁電流が
直線的に変化しないという問題が発生する。 However, if the electromagnet with the structure shown in Fig. 1 is made smaller in size in order to satisfy condition 1, the linearity of the current vs. resonance frequency, which is condition 2, will deteriorate, that is, the strength of the DC magnetic field in the air gap g will decrease. In this case, a problem arises in that the excitation current does not change linearly.
このような問題は、特に磁気部材１，２の磁極
部１ａ，２ａの飽和によつて発生する。 Such a problem occurs particularly when the magnetic pole parts 1a and 2a of the magnetic members 1 and 2 become saturated.
第２図は磁極部１ａが中心線に平行に等しい大
きさＭで磁化されていると仮定した場合の反磁界
Hdの中心線上の分布を示している。外部磁界を
He（コイルによつて発生する磁界）、磁極部１ａ
内の磁界をHiとすると、Hi＝He＋Hdの関係か
ら反磁界Hdの絶対値の小さい部分、つまり第２
図で示すように磁極部１ａの根元の部分は僅かな
外部磁界で磁化Ｍの大きさになる。 Figure 2 shows the demagnetizing field when it is assumed that the magnetic pole part 1a is magnetized with an equal magnitude M parallel to the center line.
It shows the distribution of Hd on the center line. external magnetic field
He (magnetic field generated by the coil), magnetic pole part 1a
If the magnetic field in
As shown in the figure, the base portion of the magnetic pole portion 1a becomes magnetized to a magnitude M by a slight external magnetic field.
したがつて、磁極部１ａに均等な外部磁界He
をかけ、外部磁界Heを大きくして行くと、まず
根元の部分が飽和することになり、次に先端の部
分が飽和する。 Therefore, an equal external magnetic field He is applied to the magnetic pole part 1a.
When the external magnetic field He is increased, the root portion becomes saturated first, and then the tip portion becomes saturated.
そこで、ビツタ形電磁石の構造としては、第３
図に示すように磁極部１ａ，２ａが漸次根元の方
で広がつている構造のものが考えられる。 Therefore, the structure of the bit type electromagnet is
As shown in the figure, a structure in which the magnetic pole parts 1a and 2a gradually widen toward the base is considered.
しかし、このような磁気構造は、励磁用のコイ
ル４ａ，４ｂの形状が複雑となり、かつ、磁極部
１ａ，２ａをテーパ状に切削することも困難であ
るため製造上の難点がある。 However, such a magnetic structure has manufacturing difficulties because the excitation coils 4a and 4b have a complicated shape and it is also difficult to cut the magnetic pole parts 1a and 2a into a tapered shape.
この考案は、かゝる実状にかんがみてなされた
もので、磁極部が比較的容易に製作でき、かつ、
磁気飽和が起り難い構造としたビツタ形の電磁石
を提供するものである。 This idea was made in view of the actual situation, and the magnetic pole part can be manufactured relatively easily, and
The present invention provides a bit-shaped electromagnet having a structure in which magnetic saturation is unlikely to occur.
第４図はこの考案の一実施例を示すビツタ形電
磁石の断面図を示したもので、１０，２０は第１
図で説明したような磁極部１０ａ，２０ａ、底部
１０ｂ，２０ｂ、及び外周部１０ｃ，２０ｃから
なるつぼ形のパーマロイ等の磁気部材である。
又、３０は空気間隙ｇと同一寸法の厚みとなつて
いるスペーサ（磁性体）、４０ａ，４０ｂは励磁
用のコイルである。 FIG. 4 shows a cross-sectional view of a bit-type electromagnet showing an embodiment of this invention, and 10 and 20 are the first
It is a pot-shaped magnetic member made of permalloy or the like, which is composed of magnetic pole parts 10a, 20a, bottom parts 10b, 20b, and outer peripheral parts 10c, 20c as explained in the drawings.
Further, 30 is a spacer (magnetic material) having the same size and thickness as the air gap g, and 40a and 40b are excitation coils.
ところで、この考案では前記磁極部１０ａ，２
０ａの形状が図示したように根元部の半径r1と、
先端部の半径r2とが異なるように形成されてい
る。すなわち、r1＞r2となる段階的に変化する円
柱状に形成されている。 By the way, in this invention, the magnetic pole parts 10a, 2
As shown in the figure, the shape of 0a is the radius r 1 of the root part,
The radius r2 of the tip part is formed to be different. That is, it is formed into a cylindrical shape that changes stepwise such that r 1 > r 2 .
第５図はこの考案の磁極部１０ａ，２０ａにお
ける反磁界Hdの分布を示したものであつて、従
来（第２図）のものに比較して反磁界Hdの大き
さが均一化されていることがわかる。 Fig. 5 shows the distribution of the demagnetizing field Hd in the magnetic pole parts 10a and 20a of this invention, and the magnitude of the demagnetizing field Hd is made more uniform compared to the conventional one (Fig. 2). I understand that.
したがつて、このような形状で構成されている
ビツタ形電磁石では、局部的な磁気飽和を起し易
い部分が解消したことになるので、励磁電流と直
流磁界の強さが比例する範囲が広くなり、これを
YIG装置に利用すると、その共振周波数の可変範
囲が広くなり、かつ、ヒステリシス特性も小さく
なる。 Therefore, in the bit type electromagnet constructed in this way, the area where local magnetic saturation is likely to occur has been eliminated, so the range in which the excitation current and the strength of the DC magnetic field are proportional is wide. become this
When used in a YIG device, the variable range of the resonant frequency becomes wider and the hysteresis characteristic becomes smaller.
第６図はこの考案のビツタ形電磁石をYIG装置
に使用したときの励磁電流の変化と共振周波数の
変化を示す特性図で、横軸はコイル電流、縦軸は
コイル電流対共振周波数の理想的な比例関係に対
する実際の共振周波数のずれを、使用上限共振周
波数に対する比率で示したものである。 Figure 6 is a characteristic diagram showing changes in excitation current and resonant frequency when the bit-shaped electromagnet of this invention is used in a YIG device, where the horizontal axis is the coil current and the vertical axis is the ideal coil current vs. resonant frequency. The deviation of the actual resonant frequency with respect to the proportional relationship is expressed as a ratio to the upper limit resonant frequency that can be used.
そして、点線Ａ第４図に示した磁気部材、実線
Ｂが第１図（従来例）の磁気部材で励磁電流を印
加した場合を示す。 The dotted line A shows the magnetic member shown in FIG. 4, and the solid line B shows the magnetic member shown in FIG. 1 (conventional example) when an excitation current is applied.
この図から、この考案のものはコイル電流が増
加した場合も、周波数の変動が少ないことが分か
る。 From this figure, it can be seen that the device of this invention has little frequency fluctuation even when the coil current increases.
又、この考案における磁極部１０ａ，２０ａの
構造は、まず、半径r1で円柱状に切削し、次に磁
極部１０ａ，２０ａの先端部分を半径r2で切削す
れば形成でき、励磁用のコイル４０ａ，４０ｂも
通常のコイル形状となつているので製造上の難点
がない。なお、磁極部１０ａ，２０ａは多段階で
先端部が縮少する同心の円柱状としてもよい。 Furthermore, the structure of the magnetic pole parts 10a, 20a in this invention can be formed by first cutting a cylindrical shape with a radius r 1 , and then cutting the tip portions of the magnetic pole parts 10a, 20a with a radius r 2 . Since the coils 40a and 40b also have a normal coil shape, there are no manufacturing difficulties. In addition, the magnetic pole parts 10a and 20a may have a concentric cylindrical shape in which the tip ends are contracted in multiple stages.
以上説明したように、この考案のビツタ形電磁
石は、空気間隙に発生する直流磁界が励磁電流に
よつて広い範囲で直線的に変化するようになるの
で、特にYIGフイルタに利用した時中心周波数が
広い範囲で可変できるという利点がある。 As explained above, the bit-type electromagnet of this invention allows the DC magnetic field generated in the air gap to vary linearly over a wide range depending on the exciting current, so the center frequency can be adjusted especially when used in a YIG filter. It has the advantage of being variable over a wide range.
又、磁極の構造も簡単な円柱状であつて、その
切削も容易であり、作り易いという特徴がある。 In addition, the structure of the magnetic pole is a simple columnar shape, and it is easy to cut, making it easy to manufacture.
第１図は従来のビツタ形電磁石の断面図、第２
図は磁極部の磁化特性を示す説明図、第３図は磁
極部の構造をテーパ状にしたビツタ形電磁石の概
要図、第４図はこの考案のビツタ形電磁石の断面
図、第５図はこの考案のビツタ形電磁石における
磁極部の磁化特性を示す説明図、第６図はこの考
案のビツタ形電磁石を使用した時のYIG共振器の
周波数変化特性図である。
図中、１０，２０は磁気部材、１０ａ，２０ａ
は磁極部、１０ｂ，２０ｂは底部、１０ｃ，２０
ｃは外周部、３０はスペーサを示す。
Figure 1 is a cross-sectional view of a conventional bit type electromagnet, Figure 2
The figure is an explanatory diagram showing the magnetization characteristics of the magnetic pole part, Figure 3 is a schematic diagram of a bit-shaped electromagnet with a tapered magnetic pole part structure, Figure 4 is a cross-sectional view of the bit-shaped electromagnet of this invention, and Figure 5 is a diagram showing the magnetization characteristics of the magnetic pole part. An explanatory diagram showing the magnetization characteristics of the magnetic pole part in the bitta-type electromagnet of this invention, and FIG. 6 is a frequency change characteristic diagram of a YIG resonator when the bitta-type electromagnet of this invention is used. In the figure, 10, 20 are magnetic members, 10a, 20a
is the magnetic pole part, 10b, 20b is the bottom part, 10c, 20
c indicates the outer periphery, and 30 indicates a spacer.
Claims (1)
２個の磁気部材を対向し、前記磁極部に励磁用の
コイルが巻回されているビツタ形電磁石におい
て、前記磁極部の半径が前記対向する先端に向か
つて段階的に縮少し、かつ、同心の円柱状に形成
されていることを特徴とするビツタ形電磁石。 In a bit-shaped electromagnet in which two magnetic members each consisting of a magnetic pole part, a bottom part, and an outer peripheral part face each other, and an excitation coil is wound around the magnetic pole part, the radius of the magnetic pole part is the opposite tip. A bit-shaped electromagnet is characterized by being formed into a concentric cylindrical shape that gradually contracts as it approaches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15042983U JPS6059505U (en) | 1983-09-30 | 1983-09-30 | Bit type electromagnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15042983U JPS6059505U (en) | 1983-09-30 | 1983-09-30 | Bit type electromagnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6059505U JPS6059505U (en) | 1985-04-25 |
| JPH0140170Y2 true JPH0140170Y2 (en) | 1989-12-01 |
Family
ID=30333647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15042983U Granted JPS6059505U (en) | 1983-09-30 | 1983-09-30 | Bit type electromagnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6059505U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0831367B2 (en) * | 1989-09-13 | 1996-03-27 | 信越化学工業株式会社 | Magnetic circuit for magnetostatic wave device and magnetostatic wave device |
-
1983
- 1983-09-30 JP JP15042983U patent/JPS6059505U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6059505U (en) | 1985-04-25 |
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