JPH0465627B2 - - Google Patents
Info
- Publication number
- JPH0465627B2 JPH0465627B2 JP58092396A JP9239683A JPH0465627B2 JP H0465627 B2 JPH0465627 B2 JP H0465627B2 JP 58092396 A JP58092396 A JP 58092396A JP 9239683 A JP9239683 A JP 9239683A JP H0465627 B2 JPH0465627 B2 JP H0465627B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- wedge
- powder
- aramid fibers
- volume
- 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 - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/48—Fastening of windings on the stator or rotor structure in slots
- H02K3/487—Slot-closing devices
- H02K3/493—Slot-closing devices magnetic
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、発電機、電動機等の回転機に用いら
れる磁性楔に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a magnetic wedge used in rotating machines such as generators and electric motors.
発電機、電動機等、回転機の導体（巻線）がお
さめられている鉄心のスロツトには導体をスロツ
ト内に固定する目的で楔が用いられている。この
楔に比透磁率（真空の透磁率＝１）が数十以下の
強磁性体を用いて鉄心のスロツト部分とテイース
部分の磁界不均一に起因する損失を減少させるこ
とを目的とした磁性楔が従来から用いられてき
た。この例を図を用いて説明する。第１図は磁性
楔を用いた誘導電動機の電機子の部分図である。
電磁鋼板の積層鉄心である電機鉄心１には図では
省略されている回転子側（内側）にテイーズ２と
スロツト８が設けられており、スロツト内には、
導体（巻線４）が鉄心との間の絶縁フイルム６ぜ
絶縁されて納められている。そしてスロツトの開
口部は磁性楔５が挿入されてスロツト内の導体を
固定している。
A wedge is used in the slot of an iron core in which the conductor (winding) of a rotating machine such as a generator or electric motor is housed in order to secure the conductor within the slot. This wedge is made of a ferromagnetic material with a relative magnetic permeability (vacuum permeability = 1) of several tens or less, and is designed to reduce the loss caused by magnetic field inhomogeneity between the slot and teeth portions of the core. has traditionally been used. This example will be explained using figures. FIG. 1 is a partial diagram of an armature of an induction motor using a magnetic wedge.
The electric machine core 1, which is a laminated core made of electromagnetic steel sheets, is provided with teeth 2 and slots 8 on the rotor side (inside), which are not shown in the figure.
The conductor (winding 4) is housed insulated from the iron core by an insulating film 6. A magnetic wedge 5 is inserted into the opening of the slot to fix the conductor within the slot.
この磁性楔は電磁気的に大きな力が加わる導体
をスロツト内に固定するため、板厚0.3〜0.5mmの
電磁鋼板を積層した鉄心のスロツトに挿入され
る。この際、電磁鋼板１枚毎に生ずるわずかな段
差、スロツト寸法のバラツキを吸収したうえで楔
に必要とされる強度を維持できることが要求され
る。つまり磁性楔は大きな変形限界と強度を両立
させたうえで所望の比透磁率、磁束密度などの磁
気特性を満足する必要がある。 This magnetic wedge is inserted into a slot in an iron core made of laminated electromagnetic steel sheets with a thickness of 0.3 to 0.5 mm in order to fix a conductor to which a large electromagnetic force is applied within the slot. At this time, it is required that the strength required for the wedge can be maintained while absorbing slight differences in level and variations in slot dimensions that occur from one electromagnetic steel sheet to another. In other words, the magnetic wedge needs to have both a large deformation limit and strength, and also satisfy desired magnetic properties such as relative magnetic permeability and magnetic flux density.
しかしながら従来の磁性楔には所望の磁気特性
を得る目的で鉄粉を樹脂で結合した材料が用いら
れてきたが、この材料から成る磁性楔は大きな強
度が得られないという欠点があり、また変形限界
も大きくとれなかつた。一方、この磁性楔材料に
さらにガラス繊維で強化した材料が、鉄粉と樹脂
のみの楔材料により強度の大きい磁性楔として用
いられているが、変形限界に対する効果は余りみ
られなかつた。 However, conventional magnetic wedges have been made of materials in which iron powder is bonded with resin in order to obtain the desired magnetic properties, but magnetic wedges made of this material have the disadvantage of not being able to obtain great strength and are deformable. I couldn't set too many limits. On the other hand, a material made by further reinforcing this magnetic wedge material with glass fiber has been used as a magnetic wedge with greater strength than a wedge material made only of iron powder and resin, but this has not had much of an effect on the deformation limit.
本発明の目的は強度が、ガラス繊維で強化した
磁性楔と同様に大きく、かつはるかに大きな変形
限界と破壊じん性値をもつ磁性楔を提供するもの
である。
It is an object of the present invention to provide a magnetic wedge which has a strength similar to that of glass fiber reinforced magnetic wedges, but which has much greater deformation limits and fracture toughness values.
本発明の磁性楔はアラミド繊維を体積比で２〜
20％含み、残部が金属磁性粉末および絶縁性結着
剤からなるものであり、前記結着剤で前記磁性粉
末と繊維とを結合したものである。なお楔への成
形は射出成形または型を用いた圧縮成形により行
い、必要に応じて熱処理を施す。アラミド繊維の
含有量を体積比で２〜20％としたのは２％未満に
なると、強度増加の効果が少くなり、一方、20％
を越えると楔の中に含まれる繊維量が多くなるた
め楔への成形が工業的に困難になつてくるためで
ある。
The magnetic wedge of the present invention contains aramid fibers at a volume ratio of 2 to 2.
20%, and the remainder consists of a metal magnetic powder and an insulating binder, and the binder binds the magnetic powder and fibers. The molding into a wedge is performed by injection molding or compression molding using a mold, and heat treatment is performed as necessary. The content of aramid fiber was set at 2% to 20% by volume, but when it becomes less than 2%, the effect of increasing strength decreases;
This is because, if the fiber content exceeds this amount, the amount of fiber contained in the wedge will increase, making it industrially difficult to form the wedge into a wedge.
また金属磁性粉末とは、鉄粉、Fe−Si合金粉、
Fe−Ni合金粉、Fe−Al合金粉、Fe−Si−Al合金
粉などの強磁性合金の粉末であり、これらの磁性
粉末１種類または２種類以上を混合して用いる。
ただし、これらの磁性粉末の粒子の平均径は大き
くなりすぎると粒子内渦電流による鉄損が増加
し、また楔としての表面粗度等の面から200μｍ
以下であることが望ましい。 Metal magnetic powders include iron powder, Fe-Si alloy powder,
It is a powder of a ferromagnetic alloy such as Fe-Ni alloy powder, Fe-Al alloy powder, Fe-Si-Al alloy powder, etc., and one type or a mixture of two or more of these magnetic powders is used.
However, if the average diameter of the particles of these magnetic powders becomes too large, iron loss due to intraparticle eddy current will increase, and from the viewpoint of surface roughness as a wedge, etc.
The following is desirable.
また、絶縁性結着剤としては、一般に絶縁性の
樹脂例えば熱硬化性の樹脂であるエポキシ樹脂、
熱可塑性樹脂であるポリアミド樹脂、ポリイミド
樹脂、ポリエステステル樹脂、ポリカーボネート
樹脂などが挙げられる。なおこの結着剤は実用
上、体積比で５％以上、好ましくは10％以上とす
ることが望ましく、又上記アラミド繊維との合計
量を体積比で20〜50％とする事が好ましい。 In addition, as the insulating binder, insulating resins such as epoxy resins, which are thermosetting resins,
Examples include thermoplastic resins such as polyamide resin, polyimide resin, polyester resin, and polycarbonate resin. In practice, it is desirable for this binder to have a volume ratio of 5% or more, preferably 10% or more, and the total amount together with the aramid fibers is preferably 20 to 50% by volume.
なお、比透磁率、磁束密度の値を制御する目的
で、非強磁性体の無機化合物粉末粒子で磁性粉を
一部置換しても良い。この無機化合物粉末とはた
とえばSiO2、ガラスビーズ、Al2O3、CaCO3、マ
イカ粉などである。 Incidentally, for the purpose of controlling the values of relative magnetic permeability and magnetic flux density, part of the magnetic powder may be replaced with non-ferromagnetic inorganic compound powder particles. Examples of the inorganic compound powder include SiO 2 , glass beads, Al 2 O 3 , CaCO 3 , and mica powder.
本発明により、従来の磁性楔に比べ破壊までの
変形が極めて大きく、じん性値も大きく、かつ強
度がガラス繊維で強化した磁性楔と同等以上であ
る磁性楔が得られる。
According to the present invention, a magnetic wedge can be obtained which has extremely large deformation before breaking compared to conventional magnetic wedges, has a large toughness value, and has a strength equivalent to or higher than that of a magnetic wedge reinforced with glass fiber.
この磁性楔は変形が大きくとれ、強度も十分で
あるためスロツトへ挿入する際の寸法のバラツキ
に起因する鉄心テイースと楔間との面圧の差が極
めて小さく、導体を固定する効果にバラツキが出
ないことと同時に挿入時の楔の破壊が極めて少い
という利点もある。 This magnetic wedge is highly deformable and has sufficient strength, so the difference in surface pressure between the core teeth and the wedge due to variations in dimensions when inserted into the slot is extremely small, and there is no variation in the effect of fixing the conductor. In addition to not coming out, there is also the advantage that there is very little damage to the wedge during insertion.
金属磁性粉末として平均粒子径105μｍ〜74μｍ
の鉄粉を用い、結着剤の樹脂としては半硬化状態
にあるエポキシ樹脂粉末を用い、アラミド繊維と
しては、繊維直径10μｍのものを用い、これらを
混合、金型を用いて圧縮成形の後熱処理を施して
エポキシ樹脂を硬化させて磁性楔を製作した。
Average particle size as metal magnetic powder: 105μm to 74μm
iron powder, semi-hardened epoxy resin powder was used as the binder resin, and aramid fibers with a fiber diameter of 10 μm were mixed, and after compression molding using a mold. A magnetic wedge was fabricated by applying heat treatment to harden the epoxy resin.
第２図にはアスペクト比300のアラミド繊維を
体積比で10％入れた場合の磁性楔について鉄粉の
体積％を横軸にとりその磁性楔の最大比透磁率を
示した。縦軸は最大比透磁率の値を示す。このよ
うに鉄粉の体積％が80％以下で磁性楔に使用する
場合に適当な比透磁率が得られている。 Figure 2 shows the maximum relative magnetic permeability of a magnetic wedge in which 10% by volume of aramid fibers with an aspect ratio of 300 are contained, with the horizontal axis representing the volume % of iron powder. The vertical axis indicates the maximum relative permeability value. In this way, when the volume percent of iron powder is 80% or less, an appropriate relative magnetic permeability is obtained when used in a magnetic wedge.
第３図には体積％でアスペクト比300のアラミ
ド繊維が10％、鉄粉が60％、樹脂が80％から成る
磁性楔の負荷荷重を縦軸に、変形量を横軸にとつ
た機械的特性を曲線１１に示す。比較のため、ア
ラミド繊維の全部をガラス繊維、カーボン繊維、
ボロン繊維、ポリアミド繊維で置き換えた磁性楔
の特性をそれぞれ曲線１２１，１２２，１２３，
１２４に、また、アラミド繊維を用いず結着剤と
してエポキシ樹脂を体積比で40％とした磁性楔の
特性を曲線１３に示す。なお×印の点１４はいず
れも破断した点であり、第３図の曲線１１，１２
は前記曲線１３を基準にした相対値で示す。この
実施例と比較例から明白なように本発明の磁性楔
な大きな変形限界を持つと同時に強度も大きい。 Figure 3 shows the mechanical properties of a magnetic wedge made of 10% aramid fibers with an aspect ratio of 300, 60% iron powder, and 80% resin, with the vertical axis representing the load and the horizontal axis representing the amount of deformation. The characteristics are shown in curve 11. For comparison, all aramid fibers are glass fiber, carbon fiber,
Curves 121, 122, 123 show the characteristics of magnetic wedges replaced with boron fiber and polyamide fiber, respectively.
124, and curve 13 shows the characteristics of a magnetic wedge in which no aramid fibers were used and the volume ratio of epoxy resin was 40% as a binder. Note that the points 14 marked with an x mark are all broken points, and the curves 11 and 12 in FIG.
is expressed as a relative value based on the curve 13. As is clear from these Examples and Comparative Examples, the magnetic wedge of the present invention has a large deformation limit and also has high strength.
第４図には体積比で鉄粉60％、エポキシ樹脂80
％、アラミド繊維10％から成る磁性楔においてア
ラミド繊維のアスペクト比を150から1500まで変
化させたときの特性を示す。横軸はアスペクト
比、縦軸はアラミド繊維を用いエポキシ樹脂を体
積比で40％とした磁性楔の破壊じん性値を１（基
準値）としたときの破壊じん性値を相対値で示
す。この結果から明らかな如くアスペクト比150
以上のアラミド繊維を用いた本発明の磁性楔は樹
脂と鉄粉だけの楔の５倍以上の破壊じん性値を持
つ。 Figure 4 shows the volume ratio of 60% iron powder and 80% epoxy resin.
%, shows the characteristics when the aspect ratio of the aramid fibers is varied from 150 to 1500 in a magnetic wedge made of 10% aramid fibers. The horizontal axis shows the aspect ratio, and the vertical axis shows the relative fracture toughness value when the fracture toughness value of a magnetic wedge made of aramid fiber and 40% epoxy resin by volume is set to 1 (reference value). As is clear from this result, the aspect ratio is 150.
The magnetic wedge of the present invention using the aramid fibers described above has a fracture toughness value five times or more that of a wedge made only of resin and iron powder.
第５図には、体積比で鉄粉を60％とし、残部を
エポキシ樹脂とアスペクト比300のアラミド繊維
とした磁性楔において、アラミド繊維の量（体積
％）を変えたときの特性を示す。横軸はアラミド
繊維の体積％、縦軸はアラミド繊維量０％のとき
の破壊じん性値を１（基準値）としたときの破壊
じん性値を相対値で示している。この結果から明
らかな如く、アラミド繊維が２％以上の本発明の
磁性楔は樹脂と鉄粉だけの楔の５倍以上の破壊じ
ん性値を持つている。 Figure 5 shows the characteristics when the amount (volume %) of aramid fibers is varied in a magnetic wedge in which iron powder is 60% by volume and the remainder is epoxy resin and aramid fibers with an aspect ratio of 300. The horizontal axis shows the volume % of the aramid fibers, and the vertical axis shows the fracture toughness value as a relative value when the fracture toughness value when the amount of aramid fiber is 0% is set to 1 (reference value). As is clear from these results, the magnetic wedge of the present invention containing 2% or more of aramid fibers has a fracture toughness value that is 5 times or more that of a wedge made only of resin and iron powder.
次に平均粒径74μｍ〜63μｍのFe−１％Si磁性
合金粉と、直径10μｍのアラミド繊維、および結
着剤としてのポリアミド樹脂を用いて磁性楔を製
作し、その特性をとつたが、結果は前記実施例と
同様であつた。なお前述実施例におけるアラミド
繊維としてはデユポン社製ケプラー（商品名）を
用いた。 Next, we fabricated a magnetic wedge using Fe-1%Si magnetic alloy powder with an average particle size of 74 μm to 63 μm, aramid fibers with a diameter of 10 μm, and polyamide resin as a binder, and measured its characteristics. was the same as in the previous example. In the above examples, Kepler (trade name) manufactured by DuPont was used as the aramid fiber.
第１図は磁性楔を用いた誘導電導機の電機子の
部分構成図を示す図、第２図乃至第５図は本発明
に係る磁性楔の特性例を示す曲線図。
１……積層鉄心、２……テイース、３……スロ
ツト、４……導体（巻線）、５……磁性楔。
FIG. 1 is a diagram showing a partial configuration of an armature of an induction machine using a magnetic wedge, and FIGS. 2 to 5 are curve diagrams showing characteristic examples of the magnetic wedge according to the present invention. 1... Laminated iron core, 2... Teeth, 3... Slot, 4... Conductor (winding), 5... Magnetic wedge.
Claims (1)
が金属磁性粉末および絶縁性結着剤からなり、前
記アラミド繊維の長さと直径との比（アスペクト
比）が150以上である事を特徴とする磁性楔。1 Containing 2 to 20% aramid fiber by volume, the remainder consisting of metal magnetic powder and insulating binder, and having a length-to-diameter ratio (aspect ratio) of the aramid fibers of 150 or more. magnetic wedge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9239683A JPS59220039A (en) | 1983-05-27 | 1983-05-27 | Magnetic wedge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9239683A JPS59220039A (en) | 1983-05-27 | 1983-05-27 | Magnetic wedge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59220039A JPS59220039A (en) | 1984-12-11 |
| JPH0465627B2 true JPH0465627B2 (en) | 1992-10-20 |
Family
ID=14053251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9239683A Granted JPS59220039A (en) | 1983-05-27 | 1983-05-27 | Magnetic wedge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59220039A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5258681A (en) * | 1990-06-29 | 1993-11-02 | Kabushiki Kaisha Toshiba | Magnetic slot wedges for dynamo-electric machines |
| KR101506236B1 (en) * | 2013-09-11 | 2015-03-27 | 국방과학연구소 | Polyurethane/aramid composite impregnated with magnetorheological fluid and methods the same |
| US11183898B2 (en) * | 2016-07-08 | 2021-11-23 | Hitachi Industrial Equipment Systems Co., Ltd. | Rotary electric machine and manufacturing method for rotary electric machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5111109A (en) * | 1974-07-18 | 1976-01-29 | Tokyo Shibaura Electric Co | JISEI KUSABI |
-
1983
- 1983-05-27 JP JP9239683A patent/JPS59220039A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59220039A (en) | 1984-12-11 |
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