JPS6057309B2 - Coreless motor stator - Google Patents
Coreless motor statorInfo
- Publication number
- JPS6057309B2 JPS6057309B2 JP51092530A JP9253076A JPS6057309B2 JP S6057309 B2 JPS6057309 B2 JP S6057309B2 JP 51092530 A JP51092530 A JP 51092530A JP 9253076 A JP9253076 A JP 9253076A JP S6057309 B2 JPS6057309 B2 JP S6057309B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- notch
- coreless motor
- anisotropic magnet
- stator
- 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
Landscapes
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Dc Machiner (AREA)
Description
【発明の詳細な説明】
本発明は、ステータヨークと異方性磁石との結合を樹
脂の射出成形にて行なう如くしたコアレスモータの固定
子に関するものであり、その目的とするところは、樹脂
を射出成形する際の樹脂の射出出力によつて発生する異
方性磁石の割れを防止することにある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator for a coreless motor in which a stator yoke and an anisotropic magnet are coupled by resin injection molding. The objective is to prevent cracking of anisotropic magnets caused by the injection output of resin during injection molding.
従来のコアレスモータの固定子は、第５図に示すよう
に、円筒形の異方性磁石１’を使用し、この異方性磁石
１’、ステータヨーク２とを射出成形による樹脂３によ
つて結合したいた。As shown in FIG. 5, the stator of a conventional coreless motor uses a cylindrical anisotropic magnet 1', and the anisotropic magnet 1' and stator yoke 2 are made of resin 3 by injection molding. I wanted to combine them.
この際、樹脂３は異方性磁石１’の中央に設けた中空部
４に入るようにしているため、樹脂３の射出成形の際に
異方性磁石１’が割れるという欠点があつた。すなわち
、異方性磁石１’は磁極方向（Ｎ−Ｓ方向）に直角な方
向の引張強度が弱いため、樹脂３の内■ア１が第６図の
ように働くことによつて第６図のａ部にクラックが発生
し易いという欠点を有するものである。 本発明はかか
る点に鑑みてなされたもので、以 下実施例により詳細
に説明する。At this time, since the resin 3 was arranged to enter the hollow part 4 provided at the center of the anisotropic magnet 1', there was a drawback that the anisotropic magnet 1' was broken during injection molding of the resin 3. That is, since the anisotropic magnet 1' has a weak tensile strength in the direction perpendicular to the magnetic pole direction (N-S direction), the inner part of the resin 3 acts as shown in FIG. This has the disadvantage that cracks are likely to occur in the a part of the steel. The present invention has been made in view of this point, and will be explained in detail below using Examples.
第１図において、１は異方性磁石で、この異方性磁石
１の中央に中空部４を設けると共に外周の磁気中性点付
近に切欠５を設けておき、ステータヨーク２と結合する
ための樹脂３を射出成形する際に中空部４と切欠５に樹
脂３を配するようにする。In FIG. 1, 1 is an anisotropic magnet, which has a hollow part 4 in the center and a notch 5 near the magnetic neutral point on the outer periphery to connect it to the stator yoke 2. When injection molding the resin 3, the resin 3 is arranged in the hollow part 4 and the notch 5.
このため、射出成形の際、第２図のように内圧Ｆ、に対
して切欠５に外方から圧力が加わり、異方性磁石１の強
度の弱い方向の樹脂圧力のバランスがとれ、又、切欠５
を設けることによつて円筒形の磁石に比べてロータに与
える磁力の減少は第３図の斜線を記した部分のみで、き
わめて微少である。樹脂３は第４図のように異方性磁石
１の上面を囲むようにすれば、切欠５での樹脂３の剥離
を防止できる。 本発明は上述のように、異方性磁石の
中央に中空部を設けると共に外周の磁気中性点付近に切
欠を設け、前記中空部と切欠にステータヨークと結合す
る射出成形による樹脂を配したものであるか゜ら、樹脂
の射出成形の磁石の割れが防止できる上、高い射出圧が
可能となり、樹脂の充填不足、寸法不良が削減でき、し
かも異方性磁石の体積を小さくできるため異方性磁石の
材料費力梢１減でき、特に、異方性磁石の磁気中性点付
近に切欠を設けて樹脂でモールドしているため、磁力の
減少はきわめて微小である上、異方性磁石は中性点方向
への力に対して割れ易いが、この方向を樹脂でモールド
することにより割れにくくでき、更に、中空部での軸受
容積を大きくとれるため、軸受寿命が向上できるという
効果を奏するものである。Therefore, during injection molding, pressure is applied from the outside to the notch 5 against the internal pressure F as shown in FIG. 2, and the resin pressure in the direction where the anisotropic magnet 1 is weak is balanced. Notch 5
By providing this, the reduction in magnetic force applied to the rotor compared to a cylindrical magnet is only in the shaded area in FIG. 3, which is extremely small. By surrounding the upper surface of the anisotropic magnet 1 with the resin 3 as shown in FIG. 4, peeling of the resin 3 at the notch 5 can be prevented. As described above, the present invention provides a hollow part in the center of an anisotropic magnet, a notch in the vicinity of the magnetic neutral point on the outer periphery, and an injection molded resin that is bonded to the stator yoke is placed in the hollow part and the notch. In addition, it is possible to prevent cracking of magnets produced by resin injection molding, and it is also possible to use high injection pressure, which reduces insufficient resin filling and dimensional defects.Furthermore, it is possible to reduce the volume of anisotropic magnets, making it possible to use anisotropic magnets. In particular, since a notch is provided near the magnetic neutral point of the anisotropic magnet and it is molded with resin, the decrease in magnetic force is extremely small, and the anisotropic magnet It is easy to break when subjected to force in the direction of the neutral point, but by molding this direction with resin, it can be made more difficult to break.Furthermore, the bearing area in the hollow part can be increased, which has the effect of improving the bearing life. It is.
第１図Ａは本発明コアレスモータの固定子の一実施例の
上面図、第１図Ｂは同上の縦断面図、第２図は同上の樹
脂成形時の説明図、第３図は同上の特性図、第４図Ａは
本発明の他の実施例の上面図、第４図Ｂは同上の縦断面
図、第５図Ａは従来のコアレスモータの固定子の上面図
、第５図Ｂは同上の縦断面図、第６図は同上の樹脂成形
時の説明図である。
１は異方性磁石、２はステータヨーク、３は樹脂、４は
中空部、５は切欠を示す。FIG. 1A is a top view of an embodiment of the stator of the coreless motor of the present invention, FIG. 1B is a vertical cross-sectional view of the same, FIG. 2 is an explanatory diagram of the same when molded with the same resin, and FIG. Characteristic diagram, FIG. 4A is a top view of another embodiment of the present invention, FIG. 4B is a vertical sectional view of the same as above, FIG. 5A is a top view of a stator of a conventional coreless motor, and FIG. 5B is a longitudinal cross-sectional view of the same as above, and FIG. 6 is an explanatory view of the same during resin molding. 1 is an anisotropic magnet, 2 is a stator yoke, 3 is a resin, 4 is a hollow portion, and 5 is a notch.
Claims (1)
成形にて行なう如くしたコアレスモータの固定子におい
て、異方性磁石の中央に中空部を設けると共に外周の磁
気中性点付近に切欠を設け、前記中空部と切欠にステー
タヨークと結合する射出成形による樹脂を配したことを
特徴とするコアレスモータの固定子。1. In the stator of a coreless motor in which the stator yoke and anisotropic magnet are coupled by resin injection molding, a hollow part is provided in the center of the anisotropic magnet, and a notch is provided near the magnetic neutral point on the outer periphery. What is claimed is: 1. A stator for a coreless motor, characterized in that the hollow portion and the notch are provided with injection molded resin that is coupled to the stator yoke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51092530A JPS6057309B2 (en) | 1976-07-31 | 1976-07-31 | Coreless motor stator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51092530A JPS6057309B2 (en) | 1976-07-31 | 1976-07-31 | Coreless motor stator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5317913A JPS5317913A (en) | 1978-02-18 |
| JPS6057309B2 true JPS6057309B2 (en) | 1985-12-14 |
Family
ID=14056900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP51092530A Expired JPS6057309B2 (en) | 1976-07-31 | 1976-07-31 | Coreless motor stator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6057309B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56153967A (en) * | 1980-04-28 | 1981-11-28 | Hitachi Ltd | Coreless motor |
| JPS5926984Y2 (en) * | 1980-05-14 | 1984-08-06 | 昭和無線工業株式会社 | seesaw switch |
| FR2560686B1 (en) * | 1984-03-05 | 1986-11-07 | Rhone Poulenc Rech | MINERALIZATION APPARATUS FOR INDIVIDUAL AUTOMATIC PROCESSING OF SAMPLES OF PRODUCTS PLACED IN CONTAINERS |
| JPS63105478U (en) * | 1986-12-24 | 1988-07-08 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4992912U (en) * | 1972-12-01 | 1974-08-12 | ||
| JPS5936141Y2 (en) * | 1974-11-30 | 1984-10-05 | 松下電工株式会社 | coreless motor |
-
1976
- 1976-07-31 JP JP51092530A patent/JPS6057309B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5317913A (en) | 1978-02-18 |
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