JPH0199464A - Permanent magnet bonded structure in rotary electric machine - Google Patents
Permanent magnet bonded structure in rotary electric machineInfo
- Publication number
- JPH0199464A JPH0199464A JP25789287A JP25789287A JPH0199464A JP H0199464 A JPH0199464 A JP H0199464A JP 25789287 A JP25789287 A JP 25789287A JP 25789287 A JP25789287 A JP 25789287A JP H0199464 A JPH0199464 A JP H0199464A
- Authority
- JP
- Japan
- Prior art keywords
- adhesive
- permanent magnet
- yoke
- hard
- soft
- 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.)
- Granted
Links
- 239000000853 adhesive Substances 0.000 claims abstract description 56
- 230000001070 adhesive effect Effects 0.000 claims abstract description 55
- 230000002093 peripheral effect Effects 0.000 claims abstract description 15
- 239000010410 layer Substances 0.000 claims description 12
- 239000012790 adhesive layer Substances 0.000 claims description 3
- 239000007858 starting material Substances 0.000 abstract description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 abstract description 2
- 229920002689 polyvinyl acetate Polymers 0.000 abstract 1
- 239000011118 polyvinyl acetate Substances 0.000 abstract 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 235000004035 Cryptotaenia japonica Nutrition 0.000 description 1
- 244000146493 Cryptotaenia japonica Species 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- -1 polyaromatic Chemical group 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Landscapes
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Dc Machiner (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ヨーク内周面に永久磁石を一体的に取付けて
なる回転電機における永久磁石の接着構造に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a permanent magnet bonding structure in a rotating electric machine in which a permanent magnet is integrally attached to the inner peripheral surface of a yoke.
〔従来技術及び発明が解決しようとする問題点〕一般に
、この種回転電機においては、ヨーク内周面に永久磁石
を接着剤によって、一体的に取付けている。しかるに、
このものでは前記ヨークと永久磁石の線膨張率が異なる
ため、スタータモータやワイパモータの如く温度変化の
激しい厳しい熱環境の下で使用されると、ヨークの膨張
、収縮により永久磁石の接着面に応力が集中してクラッ
クが発生してしまうという欠点がある。そこで従来、特
開昭６１−２８５０４１号公報に示す如く、永久磁石の
接着面の全面に軟質の樹脂剤からなる層を形してクラッ
ク発生を防止する試みもあるが、この場合、永久磁石は
硬質接着剤によって直接では軟質の樹脂層を介した間接
的な接着となってしまい、このため接着力に劣り、さら
には永久磁石のヨークに対する一体剛性化が果し得ない
という欠点があり問題となる。[Prior Art and Problems to be Solved by the Invention] Generally, in this type of rotating electric machine, permanent magnets are integrally attached to the inner peripheral surface of the yoke with an adhesive. However,
In this product, the yoke and the permanent magnet have different coefficients of linear expansion, so when used in a harsh thermal environment with rapid temperature changes, such as in a starter motor or wiper motor, the expansion and contraction of the yoke causes stress on the adhesive surface of the permanent magnet. There is a disadvantage that cracks occur due to concentration of Therefore, as shown in Japanese Patent Application Laid-Open No. 61-285041, there has been an attempt to prevent cracks by forming a layer of soft resin over the entire adhesive surface of the permanent magnet, but in this case, the permanent magnet Direct adhesion with a hard adhesive results in indirect adhesion via a soft resin layer, which results in poor adhesion, and furthermore, there is a problem in that it is impossible to achieve integral rigidity with the permanent magnet yoke. Become.
本発明は、上記の如き実情に鑑みこれらの欠点を一掃す
ることができる回転電機における永久磁石の接着構造を
提供することを目的として創案されたものであって、円
筒状のヨーク内周面に永久磁石を接着してなる回転電機
において、前記永久磁石のヨークへの接着層は、永久磁
石の周方向に対し、永久磁石とヨークとが硬質接着剤を
もって直接接着される硬質部層と、軟質接着剤を介在す
る可撓部層とを設けたことを特徴とするものである。In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing an adhesive structure for permanent magnets in a rotating electrical machine that can eliminate these drawbacks. In a rotating electric machine in which permanent magnets are bonded, the adhesive layer of the permanent magnet to the yoke is composed of a hard layer in which the permanent magnet and the yoke are directly bonded with a hard adhesive, and a soft layer in the circumferential direction of the permanent magnet. It is characterized by providing a flexible portion layer with an adhesive interposed therebetween.
そして本発明は、この構成によって、ヨークの膨張、収
縮によるクラックの発生を確実に防止し、これと同時に
永久磁石のヨークに対する一体剛性化も果し得るように
したものである。With this configuration, the present invention reliably prevents the occurrence of cracks due to expansion and contraction of the yoke, and at the same time, it is possible to achieve integral rigidity of the permanent magnet with the yoke.
次に、本発明の実施例を図面に基づいて説明する。図面
において、１は例えば自動車等に取付けられるスタータ
用のモータであって、該モータ１は、外殻を形成する円
筒形のヨーク２に、後述する永久磁石３、ロータ４、刷
子５等を内装して構成されている。Next, embodiments of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a starter motor installed in, for example, an automobile, and the motor 1 includes a cylindrical yoke 2 forming an outer shell, and a permanent magnet 3, a rotor 4, a brush 5, etc., which will be described later, inside. It is configured as follows.
前記永久磁石３は、ヨーク２の内周面２ａに一体的に固
着されるものであるが、本発明では、フェノール系、ア
クリル系、エポキシ系、ポリアロマティック系、変成ア
クリル樹脂等の硬質接着剤６と、酢酸ビニル系、ゴム系
、ポリビニルアルコール系、アクリル系等の可撓性を有
する軟質接着剤７とを用いて接着している。即ち、第２
図に示す第一実施例のものは、永久磁石３の外周面（接
着面）３ａにおける四周縁部に軟質接着剤７が塗布され
ており、さらにこの軟質接着剤７の塗布部と軟質接着剤
７が塗布されない中央部を含む永久磁石３の外周面３ａ
全体が硬質接着剤６によってヨーク２内周面２ａに接着
されている。これにより永久磁石３の外周面３ａは、中
央部が硬質接着剤６でヨーク２の内周面２ａに直接接着
され、四周縁部が軟質接着剤７及び硬質接着剤６を介し
てヨーク２の内周面２ａに接着されるようになっている
。尚、軟質接着剤７の層の厚さは約５０μｍ以下で、硬
質接着剤６ａの層と合わせた層の厚さは約０．１ｍｍで
ある。The permanent magnet 3 is integrally fixed to the inner circumferential surface 2a of the yoke 2, but in the present invention, a hard adhesive such as phenolic, acrylic, epoxy, polyaromatic, modified acrylic resin, etc. is used. adhesive 6 and a flexible soft adhesive 7 such as vinyl acetate, rubber, polyvinyl alcohol, or acrylic. That is, the second
In the first embodiment shown in the figure, a soft adhesive 7 is applied to the four peripheral edges of the outer circumferential surface (adhesive surface) 3a of the permanent magnet 3, and the soft adhesive 7 is The outer circumferential surface 3a of the permanent magnet 3 including the central part where 7 is not applied
The entire body is bonded to the inner circumferential surface 2a of the yoke 2 with a hard adhesive 6. As a result, the outer circumferential surface 3a of the permanent magnet 3 is directly bonded to the inner circumferential surface 2a of the yoke 2 at the center with the hard adhesive 6, and the four circumferential edges are bonded to the inner circumferential surface 2a of the yoke 2 via the soft adhesive 7 and the hard adhesive 6. It is adapted to be adhered to the inner circumferential surface 2a. The thickness of the layer of soft adhesive 7 is about 50 μm or less, and the thickness of the layer combined with the layer of hard adhesive 6a is about 0.1 mm.
前記硬質、軟質の再接着剤６．７による永久磁石３の接
着手順は次の様になっている。まず、永久磁石３の外周
面３ａの四周縁部に軟質接着剤７を塗布して充分養生さ
せる。次に、硬質接着剤６を、外周面３ａの中央部には
直接塗布し、四周縁部にはすでに養生した軟質接着剤７
に重ねるように塗布する。そして、永久磁石３をヨーク
２に貼り合わせた後、硬質接着剤６を加熱等により養生
硬化させて接着が完了する。The procedure for bonding the permanent magnet 3 using the hard and soft re-adhesives 6.7 is as follows. First, the soft adhesive 7 is applied to the four peripheral edges of the outer circumferential surface 3a of the permanent magnet 3 and sufficiently cured. Next, hard adhesive 6 is applied directly to the center of the outer circumferential surface 3a, and soft adhesive 7, which has already been cured, is applied to the four peripheral edges.
Apply in layers. After the permanent magnet 3 is bonded to the yoke 2, the hard adhesive 6 is cured by heating or the like to complete the bonding.
叙述の如く構成された本発明の実施例において、永久磁
石３はヨーク２に一体的に接着されるが、その外周面３
ａ全面が硬質接着剤６によって接着されるのではなく、
外周面３ａの四周縁部は軟質接着剤７を介してヨーク２
内周面に接着されている。従って、永久磁石３の外周面
３ａの周方向の接着域が小さくなって、線膨張率の相違
に基づく周方向の応力集中が自由度の高い軟質接着剤７
によって吸収分散されることになり、この結果永久磁石
３にクラックが入ってしまうことを効果的に防止できる
。しかもこのものにおいて、永久磁石３は、硬質接着剤
６によるヨーク２への直接的接着もあるため、ヨーク２
に対する一体剛性化も果し得て、高信頼化に支障をきた
すことがない。In the embodiment of the present invention constructed as described above, the permanent magnet 3 is integrally bonded to the yoke 2, but the outer peripheral surface 3
a The entire surface is not glued with the hard adhesive 6,
The four peripheral edges of the outer peripheral surface 3a are attached to the yoke 2 via a soft adhesive 7.
It is glued to the inner circumferential surface. Therefore, the adhesive area in the circumferential direction of the outer circumferential surface 3a of the permanent magnet 3 becomes small, and the soft adhesive 7 has a high degree of freedom in stress concentration in the circumferential direction based on the difference in coefficient of linear expansion.
As a result, cracks in the permanent magnet 3 can be effectively prevented. Moreover, in this device, the permanent magnet 3 is directly attached to the yoke 2 using a hard adhesive 6, so the yoke 2
It is also possible to achieve integral rigidity for the parts, without interfering with high reliability.
しかも実施例において、硬質接着剤６と軟質接着剤７と
は周方向左右対称状に設けられているので、線膨張の相
違に基づいた応力集中を左右両側で対称的に吸収分散で
きることとなり、従ってクラック発生の防止効果がより
一層高まることになる。Moreover, in the embodiment, since the hard adhesive 6 and the soft adhesive 7 are provided symmetrically in the circumferential direction, stress concentration based on the difference in linear expansion can be absorbed and dispersed symmetrically on both the left and right sides. The effect of preventing crack generation will be further enhanced.
尚、本発明は、前記実施例に限定されないことは勿論で
あって、要は永久磁石３の外周面の一部を軟質接着剤７
を介してヨーク２に接着するようにしたものであればよ
いものであるから、例えば第３図〜第６図に示す様なも
のであってもよい。It should be noted that the present invention is of course not limited to the above-mentioned embodiments, and the point is that a part of the outer peripheral surface of the permanent magnet 3 is bonded with the soft adhesive 7.
Any material that can be bonded to the yoke 2 via the yoke 2 may be used, and may be, for example, those shown in FIGS. 3 to 6.
即ち、第３図のものは、永久磁石３の外周面３ａにおけ
る両開側部に軟質接着剤７が塗布されているもので、永
久磁石３の軸方向長さが短い場合には前記実施例のよう
に軟質接着剤７を四周縁部に塗布しなくてもこのもので
充分な応力吸収ができる。第４図のもは、軟質接着剤７
を硬質接着剤６の層と同程度の厚さに塗布したもので、
応力の吸収性が高いものである。第５図のものは、永久
磁石３の外周面３ａにおける中央部に軟質接着剤を塗布
したもので、永久磁石３の両開側部が収縮する力に対し
、歪の中心を内径へ移動させて吸収することができる。That is, the one in FIG. 3 has a soft adhesive 7 applied to both open sides of the outer circumferential surface 3a of the permanent magnet 3, and when the axial length of the permanent magnet 3 is short, the above-mentioned embodiment This material can sufficiently absorb stress without applying the soft adhesive 7 to the four peripheral parts as shown in FIG. The one in Figure 4 is soft adhesive 7.
is applied to the same thickness as the layer of hard adhesive 6,
It has high stress absorption properties. The one in Figure 5 has a soft adhesive applied to the center of the outer circumferential surface 3a of the permanent magnet 3, so that the center of strain is moved toward the inner diameter in response to the force that causes the both open sides of the permanent magnet 3 to contract. can be absorbed.
第６図のものは、第５図のものの変形で、第４図のもの
と同様の利点を有する。The one in FIG. 6 is a modification of the one in FIG. 5 and has the same advantages as the one in FIG. 4.
以上要するに、本発明は叙述の如く構成されたものであ
るから、線膨張率の相違によりヨークと永久磁石との接
着面に応力集中があったとしても、その応力は、軟質接
着剤層による弾性変形によって、吸収分散されることと
なり、この結果永久磁石接着面のクラック発生が効果的
に防止されることになる。しかもこのものにおいて、永
久磁石はヨークとの間で硬質接着剤によって直接的に接
着されて一体剛性化されているので、クラック防止が確
実に計れるものでありながら、永久磁石がヨークと一体
化した信顛性の高いものにできることなる。In summary, since the present invention is constructed as described above, even if stress is concentrated on the adhesive surface between the yoke and the permanent magnet due to the difference in coefficient of linear expansion, the stress is absorbed by the elasticity of the soft adhesive layer. The deformation results in absorption and dispersion, and as a result, the generation of cracks on the adhesive surface of the permanent magnet is effectively prevented. Moreover, in this product, the permanent magnet is directly bonded to the yoke using a hard adhesive to make it integrally rigid, so while crack prevention can be reliably measured, the permanent magnet is integrated with the yoke. What you can do is make it highly reliable.
図面は、本発明に係る回転電機における永久磁石の接着
構造の実施例を示したものであって、第１図はモータの
断面側面図、第２図Ａ、 Ｂはそれぞれ要部を示す平面
図、縦断面図、第３図Ａ、Ｂ。
第４図Ａ、 Ｂ、第５図Ａ、 Ｂ、第６図Ａ、 Ｂはそ
れぞれ他の実施例を示す要部の平面図、縦断面図である
。
図中、ｌはモータ、２はヨーク、３は永久磁石、６は硬
質接着剤、７は軟質接着剤である。
特許出願人 株式会社三ツ葉電機製作所第３図The drawings show an embodiment of the adhesive structure for permanent magnets in a rotating electric machine according to the present invention, in which FIG. 1 is a cross-sectional side view of the motor, and FIGS. 2A and 2B are plan views showing the main parts, respectively. , longitudinal section, Figures 3A and B. FIGS. 4A and 4B, 5A and 5B, and 6A and 6B are plan views and vertical sectional views of main parts showing other embodiments, respectively. In the figure, l is a motor, 2 is a yoke, 3 is a permanent magnet, 6 is a hard adhesive, and 7 is a soft adhesive. Patent applicant Mitsuba Electric Manufacturing Co., Ltd. Figure 3
Claims (1)
機において、前記永久磁石のヨークへの接着層は、永久
磁石の周方向に対し、永久磁石とヨークとが硬質接着剤
をもって直接接着される硬質部層と、軟質接着剤を介在
する可撓部層とを設けたことを特徴とする回転電機にお
ける永久磁石の接着構造。In a rotating electrical machine in which a permanent magnet is bonded to the inner peripheral surface of a cylindrical yoke, the adhesive layer of the permanent magnet to the yoke is formed by directly bonding the permanent magnet and the yoke with a hard adhesive in the circumferential direction of the permanent magnet. 1. An adhesive structure for permanent magnets in a rotating electric machine, characterized in that a hard part layer is provided with a soft adhesive, and a flexible part layer is provided with a soft adhesive interposed therebetween.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62257892A JPH0667160B2 (en) | 1987-10-13 | 1987-10-13 | Rotating electric machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62257892A JPH0667160B2 (en) | 1987-10-13 | 1987-10-13 | Rotating electric machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0199464A true JPH0199464A (en) | 1989-04-18 |
| JPH0667160B2 JPH0667160B2 (en) | 1994-08-24 |
Family
ID=17312636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62257892A Expired - Fee Related JPH0667160B2 (en) | 1987-10-13 | 1987-10-13 | Rotating electric machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0667160B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4990876A (en) * | 1989-09-15 | 1991-02-05 | Eastman Kodak Company | Magnetic brush, inner core therefor, and method for making such core |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53118713A (en) * | 1977-03-28 | 1978-10-17 | Ina Sankyo Kk | Method of fixing magnet body in compact motor |
| JPS56101365A (en) * | 1980-01-18 | 1981-08-13 | Hitachi Ltd | Small motor |
| JPS58139888U (en) * | 1982-03-15 | 1983-09-20 | 三菱電機株式会社 | DC machine field device |
-
1987
- 1987-10-13 JP JP62257892A patent/JPH0667160B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53118713A (en) * | 1977-03-28 | 1978-10-17 | Ina Sankyo Kk | Method of fixing magnet body in compact motor |
| JPS56101365A (en) * | 1980-01-18 | 1981-08-13 | Hitachi Ltd | Small motor |
| JPS58139888U (en) * | 1982-03-15 | 1983-09-20 | 三菱電機株式会社 | DC machine field device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4990876A (en) * | 1989-09-15 | 1991-02-05 | Eastman Kodak Company | Magnetic brush, inner core therefor, and method for making such core |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0667160B2 (en) | 1994-08-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |