JPH0439202B2 - - Google Patents
Info
- Publication number
- JPH0439202B2 JPH0439202B2 JP62136849A JP13684987A JPH0439202B2 JP H0439202 B2 JPH0439202 B2 JP H0439202B2 JP 62136849 A JP62136849 A JP 62136849A JP 13684987 A JP13684987 A JP 13684987A JP H0439202 B2 JPH0439202 B2 JP H0439202B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- hole
- ring
- porcelain
- electrodes
- 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
- 229910052573 porcelain Inorganic materials 0.000 claims description 19
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims 1
- 229910000679 solder Inorganic materials 0.000 description 9
- 238000005476 soldering Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
Landscapes
- Dc Machiner (AREA)
- Thermistors And Varistors (AREA)
- Motor Or Generator Current Collectors (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、小型モーターの火花消去用として
使用されるリング状バリスタに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ring-shaped varistor used for extinguishing sparks in small motors.
［従来の技術］
第７図で示すように、従来の一般的なバリスタ
は、チタン酸すトロンチウムを半導体化させたリ
ング状の焼結体からなる磁器１を用い、その表面
に互いに絶縁された複数の電極３を形成してな
る。磁器１は貫通孔２を有する円板、即ちリング
形を呈し、電極１３は上記貫通孔２を囲む主面に
複数に分割して形成される。[Prior Art] As shown in Fig. 7, a conventional general varistor uses a porcelain 1 made of a ring-shaped sintered body made of trontium titanate semiconductor, and has a porcelain 1 made of a ring-shaped sintered body made of semiconductor trontium titanate. A plurality of electrodes 3 are formed. The porcelain 1 is in the shape of a disk or ring having a through hole 2, and the electrode 13 is divided into a plurality of parts and formed on the main surface surrounding the through hole 2.
このリング状バリスタは、上記電極３にモータ
ーの整流子の電極を半田付けすることによつて、
モーターの電気子に装着される。これによつてブ
ラシから発生する火花を消去する。 This ring-shaped varistor is manufactured by soldering the motor commutator electrode to the electrode 3.
Attached to the armature of the motor. This eliminates sparks generated from the brush.
［発明が解決しようとする問題点］
しかし、上記従来のリング状バリスタでは、次
のような問題点があつた。[Problems to be Solved by the Invention] However, the above conventional ring-shaped varistor has the following problems.
先ず第一に、主面の電極３に半田付けする際、
磁器１が割れやすいという点である。これは、電
極３に加熱、溶融した半田を付着させると、半田
の保有する熱が電極３全体から磁器１の厚み方向
に伝熱される結果、その方向の温度分布が一時的
に急勾配となり、このとき発生する熱応力で磁器
１１が破損されるものと考えられる。 First of all, when soldering to the electrode 3 on the main surface,
The problem is that the porcelain 1 is easily broken. This is because when heated and molten solder is attached to the electrode 3, the heat held by the solder is transferred from the entire electrode 3 in the thickness direction of the porcelain 1, resulting in a temporary steep gradient in the temperature distribution in that direction. It is thought that the porcelain 11 is damaged by the thermal stress generated at this time.
第二に、半田付け工程に手数がかかるという点
である。即ち、小さいバリスタの電極３に半田付
けすることは、人手による作業はもちろんのこ
と、自動化の困難性が高く、省力化しにくい。 Second, the soldering process is time-consuming. That is, soldering the electrodes 3 of a small varistor is not only a manual operation but also highly difficult to automate, making it difficult to save labor.
この発明は、従来のリング状バリスタにおける
上記の問題点を解決することを目的とする。 The present invention aims to solve the above-mentioned problems with conventional ring-shaped varistors.
［問題を解決するための手段］
即ち、第１図〜第６図の符号を引用しながらこ
の発明の構成について説明すると、この発明によ
るリング状バリスタは、板状のバリスタ用磁器１
１の中央に形成された貫通孔１２の周面に、互い
に絶縁された複数の電極１４を形成したものであ
る。[Means for Solving the Problem] That is, the structure of the present invention will be explained while referring to the reference numerals shown in FIGS. 1 to 6.
A plurality of mutually insulated electrodes 14 are formed on the circumferential surface of a through hole 12 formed in the center of the electrode.
［作用］
この発明によるリング状バリスタは、貫通孔１
２の周壁に電極１４が形成されているため、小型
モーターの整流子をこの周面の電極１４に接続で
きる。この場合、半田付けに伴う加熱により、磁
器１１に加えられた熱は、貫通孔１２の内壁から
これより断面積の広い外周側へと放射状に伝達さ
れるため、外周側に伝熱されるに従つて熱が分解
され、急激な温度勾配が生じ難い。[Function] The ring-shaped varistor according to the present invention has through holes 1
Since the electrode 14 is formed on the peripheral wall of 2, a commutator of a small motor can be connected to the electrode 14 on this peripheral surface. In this case, the heat applied to the porcelain 11 due to the heating caused by soldering is radially transmitted from the inner wall of the through hole 12 to the outer circumferential side, which has a wider cross-sectional area. As a result, heat is decomposed and a sharp temperature gradient is less likely to occur.
また半田付けは、第２図で示すように、貫通孔
１２の中に整流子ｃの電極ｅを嵌め込み、ここに
直接半田付けできる。例えば、電極１４にクリー
ム半田を塗布し、貫通孔１２に整流子ｃの電極ｅ
を嵌め込んだ後、加熱、冷却するという手段で半
田付けが可能である。 Further, soldering can be performed by fitting the electrode e of the commutator c into the through hole 12 and directly soldering thereto, as shown in FIG. For example, apply cream solder to the electrode 14, and apply the electrode e of the commutator c to the through hole 12.
After fitting, soldering is possible by heating and cooling.
［実施例］
次に、図面を参照しながらこの発明の実施例に
ついて説明する。[Example] Next, an example of the present invention will be described with reference to the drawings.
先ず、第１図と第２図で示す実施例について説
明すると、バリスタ用の磁器１１は中央に貫通孔
１２を有する板状のもので、外周側の外形線は通
常円形である。上記貫通孔１２の内周には等間隔
で磁器１１の厚み方向に亙る溝１５が形成され、
その溝１５の間に導体膜からなる電極１４が形成
されている。この実施例の場合は電極としてＢ繼
Ｌ貫通孔１２内の電極１４のみが形成され、磁器
１１の他の面には電極が形成されていない。 First, the embodiment shown in FIGS. 1 and 2 will be described. The porcelain 11 for a varistor is plate-shaped with a through hole 12 in the center, and the outline of the outer periphery is usually circular. Grooves 15 extending in the thickness direction of the porcelain 11 are formed at equal intervals on the inner periphery of the through hole 12,
An electrode 14 made of a conductive film is formed between the grooves 15. In this embodiment, only the electrode 14 in the B-L through-hole 12 is formed as an electrode, and no electrode is formed on the other surfaces of the porcelain 11.
上記電極１４は、例えばロール転写法などの手
段で貫通孔１２の周面に導電ペーストを塗布し、
これを焼き付けて形成することが出来る。即ち、
導電ペーストを塗布した棒状のローラー（図示せ
ず）を貫通孔１２に挿入し、該ローラを回転させ
て貫通孔１２の内周に導電ペーストを塗布し、そ
の後これを焼き付けるという手段である。 The electrode 14 is formed by applying a conductive paste to the circumferential surface of the through hole 12 by, for example, a roll transfer method.
This can be formed by baking. That is,
This method involves inserting a rod-shaped roller (not shown) coated with conductive paste into the through hole 12, rotating the roller to apply the conductive paste to the inner periphery of the through hole 12, and then baking it.
このロール転写で電極を形成する際、上記溝１
５が複数の電極１４を互いに分離し、好ましい絶
縁状態を形成する。もちろん他の手段で電極１４
を形成することも可能であり、上記溝１５が形成
されていない場合は、レジスト等を用いて各電極
１４間の絶縁状態を形成することができる。 When forming electrodes by this roll transfer, the groove 1
5 separates the plurality of electrodes 14 from each other and creates a favorable insulation condition. Of course, the electrode 14 can be
If the groove 15 is not formed, it is possible to form an insulating state between each electrode 14 using a resist or the like.
このバリスタを小型モーターのローターに装着
する場合は、その整流子ｃの電極ｅを貫通孔１２
の周面に形成された上記電極１４に半田付けす
る。この場合、整流子ｃの電極を磁器１１の貫通
孔１２に嵌め込み、上記電極１４を直接整流子ｃ
側の電極ｅに半田付けするとよい。例えば、上記
電極１４に予め半田ペーストを塗布しておき、所
定の位置関係で貫通孔１２に整流子ｃを嵌め込ん
だ後、上記半田ペーストを加熱、冷却して半田付
けする。 When installing this varistor on the rotor of a small motor, connect the electrode e of the commutator c to the through hole 12.
It is soldered to the electrode 14 formed on the circumferential surface of. In this case, the electrodes of the commutator c are fitted into the through holes 12 of the porcelain 11, and the electrodes 14 are directly connected to the commutator c.
It is recommended to solder the electrode e on the side. For example, solder paste is applied to the electrodes 14 in advance, and after the commutator c is fitted into the through hole 12 in a predetermined positional relationship, the solder paste is heated and cooled to be soldered.
次に、第３図と第４図で示した実施例は、貫通
孔１２の周面に形成した上記電極１４の他に、こ
れらと連続する電極１３を磁器１１の一方の主面
に形成したものである。この場合、整流子ｃと接
続するための半田が貫通孔１２の周面に形成され
た電極１４にのみ付着し、主面側の電極１３に付
着しないよう、電極１３を半田レジスト膜１６で
覆うのが望ましい。この半田レジスト膜１６は、
第３図と第４図で示すように、必ずしも電極１３
のほぼ全面を覆う必要はなく、例えば第５図と第
６図で示すように、貫通孔１２の縁の部分にのみ
形成しても同様の効果が得られる。 Next, in the embodiment shown in FIGS. 3 and 4, in addition to the electrode 14 formed on the circumferential surface of the through hole 12, an electrode 13 continuous with these is formed on one main surface of the porcelain 11. It is something. In this case, the electrodes 13 are covered with a solder resist film 16 so that the solder for connecting with the commutator c adheres only to the electrodes 14 formed on the peripheral surface of the through hole 12 and does not adhere to the electrodes 13 on the main surface side. is desirable. This solder resist film 16 is
As shown in FIGS. 3 and 4, the electrode 13
It is not necessary to cover almost the entire surface of the through hole 12, and the same effect can be obtained by forming it only on the edge of the through hole 12, as shown in FIGS. 5 and 6, for example.
［発明の効果］
以上説明した通り、この発明によれば、半田付
けの際に磁器１１の内部に急な温度勾配が生じ難
く、熱応力による割れの発生を低減できる。ま
た、整流子ｃの電極ｅとの接続も、貫通孔１２に
該電極ｅを嵌め込んで直接半田付けができるた
め、小型モーターの電気子への組み付けも容易と
なる。これにより、自動化による省力化が容易に
実現できる。[Effects of the Invention] As described above, according to the present invention, a steep temperature gradient is unlikely to occur inside the porcelain 11 during soldering, and the occurrence of cracks due to thermal stress can be reduced. Furthermore, since the electrode e of the commutator c can be directly connected to the electrode e by fitting the electrode e into the through hole 12 and being directly soldered, it is easy to assemble the commutator c to the armature of the small motor. This makes it easy to save labor through automation.
第１図はこの発明の実施例を示すリング状バリ
スタの斜視図、第２図は第１図のＡ−Ａ線断面
図、第３図は他の実施例を示すリング状バリスタ
の斜視図、第４図は第３図のＢ−Ｂ線断面図、第
５図は他の実施例を示すリング状バリスタの斜視
図、第６図は第５図のＣ−Ｃ線断面図、第７図は
リング状バリスタの従来例を示す斜視図である。
１１……磁器、１２……磁器の貫通孔、１３，
１４……バリスタの電極、１５……磁器の溝、ｃ
……モーターの整流子、ｅ……整流子の電極。
FIG. 1 is a perspective view of a ring-shaped varistor showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 3 is a perspective view of a ring-shaped varistor showing another embodiment. 4 is a sectional view taken along line B-B in FIG. 3, FIG. 5 is a perspective view of a ring-shaped varistor showing another embodiment, FIG. 6 is a sectional view taken along line C-C in FIG. 5, and FIG. 1 is a perspective view showing a conventional example of a ring-shaped varistor. 11...Porcelain, 12...Porcelain through hole, 13,
14... Varistor electrode, 15... Porcelain groove, c
... Commutator of the motor, e... Commutator electrode.
Claims (1)
磁器１１に複数の電極１３を設けたリング状バリ
スタにおいて、上記貫通孔１２の周面に互いに絶
縁された複数の電極１４を形成したことを特徴と
するリング状バリスタ。 ２ 磁器１１に形成された電極が、その貫通孔の
周面に形成された電極１４のみからなる特許請求
の範囲第１項記載のリング状バリスタ。 ３ 貫通孔１２に形成された電極１４が磁器１１
の主面に形成された電極１３と連続する導体から
なる特許請求の範囲第１項記載のリング状バリス
タ。 ４ 貫通孔がその周壁に等間隔毎の縦方向の溝１
５を有するものからなる特許請求の範囲第１項〜
第３項のいずれかに記載のリング状バリスタ。[Claims] 1. In a ring-shaped varistor in which a plurality of electrodes 13 are provided on a plate-shaped varistor porcelain 11 having a through-hole 12 in the center, a plurality of electrodes 14 insulated from each other are provided on the circumferential surface of the through-hole 12. A ring-shaped varistor characterized by forming. 2. The ring-shaped varistor according to claim 1, in which the electrode formed on the porcelain 11 consists only of the electrode 14 formed on the circumferential surface of the through hole. 3 The electrode 14 formed in the through hole 12 is made of porcelain 11
A ring-shaped varistor according to claim 1, comprising a conductor continuous with the electrode 13 formed on the main surface of the ring-shaped varistor. 4 The through hole has vertical grooves 1 at equal intervals on its peripheral wall.
Claims 1 to 5 consist of:
The ring-shaped varistor according to any one of Item 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62136849A JPS63301503A (en) | 1987-05-30 | 1987-05-30 | Ring type varister and usage thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62136849A JPS63301503A (en) | 1987-05-30 | 1987-05-30 | Ring type varister and usage thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63301503A JPS63301503A (en) | 1988-12-08 |
| JPH0439202B2 true JPH0439202B2 (en) | 1992-06-26 |
Family
ID=15184941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62136849A Granted JPS63301503A (en) | 1987-05-30 | 1987-05-30 | Ring type varister and usage thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63301503A (en) |
-
1987
- 1987-05-30 JP JP62136849A patent/JPS63301503A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63301503A (en) | 1988-12-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
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| EXPY | Cancellation because of completion of term |