JPH03277156A - Outer rotor type spindle motor - Google Patents
Outer rotor type spindle motorInfo
- Publication number
- JPH03277156A JPH03277156A JP7431190A JP7431190A JPH03277156A JP H03277156 A JPH03277156 A JP H03277156A JP 7431190 A JP7431190 A JP 7431190A JP 7431190 A JP7431190 A JP 7431190A JP H03277156 A JPH03277156 A JP H03277156A
- Authority
- JP
- Japan
- Prior art keywords
- stator
- bracket
- fixed
- groove
- spindle
- 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.)
- Pending
Links
- 239000011553 magnetic fluid Substances 0.000 claims abstract description 10
- 239000000696 magnetic material Substances 0.000 claims abstract description 5
- 230000000694 effects Effects 0.000 description 8
- 238000003801 milling Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Brushless Motors (AREA)
- Motor Or Generator Frames (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、磁気ディスク又は光ディスク等の記録媒体
を直結する外側回転子形スピンドルモータに関し、特に
軸固定式のものにおいて、固定子リードを外部に引出す
のに適したものに係る。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an outer rotor type spindle motor that directly connects a recording medium such as a magnetic disk or an optical disk. Pertains to items suitable for withdrawal.
外側回転子形スピンドルモータには軸固定式のものと軸
回転式のものとがある。前者のもので固定子の両側に一
対の軸受を配置するものは１、固定子リードを固定軸の
中を通して外部に引出す構造となる。There are two types of outer rotor type spindle motors: those with a fixed shaft and those with a rotating shaft. The former type, in which a pair of bearings are arranged on both sides of the stator, has a structure in which the stator lead is passed through the fixed shaft and pulled out to the outside.
第３図は従来例の断面図、第４図は第３図の■■断面図
である。FIG. 3 is a cross-sectional view of the conventional example, and FIG. 4 is a cross-sectional view of FIG.
図において外側回転子形スピンドルモータは、ブラケッ
ト１の一方側にねじ部２で固定軸３をねし結合し、この
固定軸３に固定子４とこの固定子４の両側に配置した一
対の軸受５ａ、５ｂとを固定する。この一対の軸受５ａ
、５ｂで支承されハブ６と軸箱７とからなる回転子８の
内側に回転子磁石９を固定し、この回転子磁石９を前記
固定子４の外側に配置して構成される。In the figure, the outer rotor type spindle motor has a fixed shaft 3 screwed onto one side of a bracket 1 through a threaded portion 2, and a stator 4 and a pair of bearings arranged on both sides of the stator 4. 5a and 5b are fixed. This pair of bearings 5a
, 5b, a rotor magnet 9 is fixed to the inside of a rotor 8 consisting of a hub 6 and an axle box 7, and this rotor magnet 9 is arranged outside the stator 4.
前記軸受５ａ、５ｂの外側には磁性流体シール１０ａ、
１０ｂが設けられ、ハブ６に取付けられる図示しない記
録媒体にグリース、フェス等の有害物質が付着するのを
防ぐ。A magnetic fluid seal 10a is provided on the outside of the bearings 5a and 5b,
10b is provided to prevent harmful substances such as grease and festival tape from adhering to a recording medium (not shown) attached to the hub 6.
そして固定軸３に中心穴１１と横穴１２を連通して、固
定子リード１３を外部へ引出す。Then, the center hole 11 and the side hole 12 are communicated with the fixed shaft 3, and the stator lead 13 is drawn out to the outside.
前記の従来例は、呼び寸法３．５インチの磁気ディスク
を５枚、ハブに取付けるものでいえば、ハブ直径は２５
Φ、ねじ部はＭ６、固定子リードの被覆の外径は０．６
Φであり、その本数は図示しないホール素子等のための
リードを含めれば３〜８本となる。In the conventional example described above, five magnetic disks with a nominal size of 3.5 inches are attached to a hub, and the hub diameter is 25.
Φ, the threaded part is M6, the outer diameter of the stator lead coating is 0.6
Φ, and the number is 3 to 8, including leads for Hall elements (not shown).
このような構造と寸法の外側回転子形スピンドルモータ
には次の問題がある。An outer rotor type spindle motor having such a structure and dimensions has the following problems.
（１）細長い中心穴の加工が困難である。(1) Machining a long and narrow center hole is difficult.
（２）中心穴に細くて数の多い固定子リード等を通す作
業が困難である。(2) It is difficult to pass a large number of thin stator leads through the center hole.
（３）中心穴の内周面が粗く、横穴との角もあって固定
子リードを痛める。(3) The inner peripheral surface of the center hole is rough and has corners with the side holes, which can damage the stator leads.
（４）ねし結合によるブラケットと固定軸との直角度が
正確でなく、記録装置全体の精度が低下して記録ミス、
記録密度の低下につながる。(4) The perpendicularity between the bracket and the fixed shaft due to the threaded connection is not accurate, reducing the accuracy of the entire recording device and causing recording errors.
This leads to a decrease in recording density.
この発明の目的は、固定子リードの引出構造と引出し作
業とが簡単で、被覆を痛めることがなく、ブラケットに
対して固定軸が、したがってハブが直角にできる外側回
転子形スピンドルモータを提供することにある。An object of the present invention is to provide an outer rotor type spindle motor in which the stator lead pull-out structure and pull-out operation are simple, the sheathing is not damaged, and the fixed shaft and therefore the hub can be made perpendicular to the bracket. There is a particular thing.
この発明１の外側回転子形スピンドルモータは、ブラケ
ットの一方側に固定した固定軸に、固定子とこの固定子
の両側に配置した一対の軸受とを固定し、この一対の軸
受で支承される回転子の内側に前記固定子を配置してな
る外側回転子形スピンドルモータにおいて、
前記固定軸の外周に前記ブラケット側軸端から前記固定
子に至る軸方向の溝を形成し、この溝に固定子リードを
埋設し、
前記ブラケット側の前記軸受の前記ブラケット側の位置
に磁性材からなるスリーブを前記固定軸に嵌着し、前記
スリーブと前記回転子との間に磁性流体シールを設ける
ものである。In the outer rotor type spindle motor of this invention 1, a stator and a pair of bearings arranged on both sides of the stator are fixed to a fixed shaft fixed to one side of a bracket, and the motor is supported by the pair of bearings. In an outer rotor type spindle motor in which the stator is arranged inside a rotor, an axial groove is formed on the outer periphery of the fixed shaft extending from the bracket side shaft end to the stator, and the stator is fixed in this groove. A child lead is embedded, a sleeve made of a magnetic material is fitted to the fixed shaft at a position on the bracket side of the bearing on the bracket side, and a magnetic fluid seal is provided between the sleeve and the rotor. be.
発明２の外側回転子形スピンドルモータは、発明１にお
いて、
前記固定軸と前記ブラケットとをねじ結合し、このブラ
ケットを前記スリーブに軸方向に当接させるものである
。The outer rotor type spindle motor according to a second aspect of the present invention is the one according to the first aspect, in which the fixed shaft and the bracket are screwed together, and the bracket is brought into contact with the sleeve in the axial direction.
発明３の外側回転子形スピンドルモータは、発明１又は
２において、
前記溝の幅は前記固定軸の軸心側より外周が狭いもので
ある。The outer rotor type spindle motor according to a third aspect of the present invention is the outer rotor type spindle motor according to the first or second aspect, wherein the width of the groove is narrower on the outer periphery than on the axial center side of the fixed shaft.
発明１においては、固定子リード、必要によりホール素
子等のリードは固定軸の外周の溝に埋めるように押し入
れて軸端へ引出すので、引出作業が楽になり、必要によ
り、溝の内面の平滑化作業も簡単である。従来の穴加工
はロングドリル等を使うが、溝ではエンドミル又はフラ
イス加工となり、仕上りもよく、結果も観察できる。In invention 1, the stator lead and, if necessary, the lead of the Hall element, etc. are pushed into the groove on the outer periphery of the fixed shaft and pulled out to the end of the shaft, making the pulling out work easier and, if necessary, smoothing the inner surface of the groove. It is also easy to work with. Conventional hole machining uses a long drill, etc., but for grooves, end milling or milling is used, and the finish is good and the results can be observed.
スピンドルモータに必要な磁性流体シールは、外周に開
く溝に対しスリーブを嵌着させて満足なシール作用を保
つとともに、溝の中の固定子リードを囲んで保護する作
用も兼ねる。The magnetic fluid seal required for a spindle motor not only maintains a satisfactory sealing effect by fitting a sleeve into a groove that opens on the outer periphery, but also serves to surround and protect the stator leads within the groove.
発明２においては、発明１の作用に加えて、固定軸とブ
ラケットとがねし結合するにもかかわらず、ブラケット
はスリーブに軸方向に当接するから、固定軸に対して直
角度が正確に保てる。スリーブの内・外径と端面との直
角度は容易に正確に出せるからである。In invention 2, in addition to the effect of invention 1, even though the fixed shaft and the bracket are jointed with each other, the bracket contacts the sleeve in the axial direction, so that the perpendicularity to the fixed shaft can be accurately maintained. . This is because the perpendicularity between the inner and outer diameters of the sleeve and the end surface can be easily and accurately determined.
発明３においては、発明１又は２の作用に加えて、溝の
外周の幅はリード線が一本人る程度のものとして順次リ
ードを入れることができ、固定軸の断面２次モーメント
が大きくなって固定軸根本の剛性が向上し、直角度がよ
り正確になる。In invention 3, in addition to the effects of invention 1 or 2, the width of the outer periphery of the groove is set to the extent that one lead wire can be inserted, and the leads can be sequentially inserted, and the second moment of area of the fixed shaft increases. The rigidity of the fixed shaft base is improved and the perpendicularity is more accurate.
第１図は実施例の断面図、第２図は第１図の■■断面図
である。従来例と同一符号を付けるものはおよそ同一機
能を持ち、以下では説明を省（こともある。FIG. 1 is a cross-sectional view of the embodiment, and FIG. 2 is a cross-sectional view of FIG. Items with the same reference numerals as those in the conventional example have approximately the same functions, and their explanations may be omitted below.
図において、ブラケット１の一方側にねじ部２で固定軸
２３をねし結合し、この固定軸２３に固定子４とこの固
定子４の両側に配置した一対の軸受５ａ、５ｂとを固定
する。この一対の軸受５ａ。In the figure, a fixed shaft 23 is threadedly coupled to one side of the bracket 1 with a threaded portion 2, and a stator 4 and a pair of bearings 5a and 5b arranged on both sides of the stator 4 are fixed to this fixed shaft 23. . This pair of bearings 5a.
５ｂで支承されハブ６と軸箱７とからなる回転子８の内
側に回転子磁石９を固定し、この回転子磁石９を前記固
定子４の外側に配置する。そして前記軸受５ａ、５ｂの
外側に磁性流体シール１Ｏａ１０ｂを設けて外側回転子
形スピンドルモータが構成される。ここまでの構造はお
よそ従来例と同一である。A rotor magnet 9 is fixed inside a rotor 8 which is supported by a rotor 5b and is made up of a hub 6 and an axle box 7, and this rotor magnet 9 is arranged outside the stator 4. A magnetic fluid seal 1Oa10b is provided on the outside of the bearings 5a, 5b to form an outer rotor type spindle motor. The structure up to this point is approximately the same as the conventional example.
実施例の特徴的な構造として、前記固定軸２３の外周に
、ブラケット側軸端から固定子４に至る軸方向の溝２１
が形成され、固定子リード１３が埋め込まれて外部に引
出される。この溝２１は固定軸の軸心側の幅Ｗ２より外
周における幅Ｗ、が狭くなっていて、ＷＩは固定子リー
ド１３の太さより少し大きくする。もっとも溝２１は単
純なコ字状をなしてフライス又はエンドミルに通した形
としてもよい。As a characteristic structure of the embodiment, an axial groove 21 is formed on the outer periphery of the fixed shaft 23 extending from the shaft end on the bracket side to the stator 4.
is formed, and the stator leads 13 are embedded and pulled out. The width W of this groove 21 at the outer periphery is narrower than the width W2 on the axis side of the fixed shaft, and WI is made slightly larger than the thickness of the stator lead 13. However, the groove 21 may have a simple U-shape and be passed through a milling cutter or an end mill.
前記固定軸２３には、ブラケット１側の軸受５ａのブラ
ケット側の位置に磁性材からなるスリーブ２２が嵌め込
まれ、回転子８の軸箱７に設けられる前記磁性流体シー
ル１０ａとともに磁性シールを形成し、あわせて開いた
溝の中の固定子リード１３等を保護する。A sleeve 22 made of a magnetic material is fitted into the fixed shaft 23 at a position on the bracket side of the bearing 5a on the bracket 1 side, and forms a magnetic seal together with the magnetic fluid seal 10a provided in the axle box 7 of the rotor 8. At the same time, the stator leads 13 and the like in the open groove are protected.
またスリーブ２２は内・外周、特に内周と端面との直角
度が研削等で正確に保たれ、固定軸２３にねじ部２でね
し結合するブラケット１がスリーブ２２に軸方向に当接
する。ねし部２に多少の隙間があってもこの当接により
ブラケット１は固定軸２３と正確に直角度を保つ。同時
にねし結合の軸方向ストッパとなり、軸方向寸法決定と
ねじの緩みがなくなる。Further, the inner and outer circumferences of the sleeve 22, especially the perpendicularity between the inner circumference and the end face, are maintained accurately by grinding or the like, and the bracket 1, which is threadedly connected to the fixed shaft 23 through the threaded portion 2, abuts on the sleeve 22 in the axial direction. Even if there is some gap in the threaded portion 2, the bracket 1 maintains an accurate perpendicularity to the fixed shaft 23 due to this contact. At the same time, it serves as an axial stopper for threaded connections, eliminating axial dimension determination and loosening of screws.
もし軸受５ａのサイズを変えないで固定軸２３に直接に
段差を設ければ、ねじ部２の寸法はますます小さく、弱
くなり、固定子リードの引出しもむづかしくなり、固定
軸の根本の剛性が低下して破損の危険も生じる。If a step is provided directly on the fixed shaft 23 without changing the size of the bearing 5a, the dimensions of the threaded portion 2 will become smaller and weaker, making it difficult to pull out the stator lead, and the root of the fixed shaft will become smaller and weaker. Rigidity decreases and there is a risk of breakage.
この発明群の軸固定式の外側回転子形スピンドルモータ
は、
・固定軸の外周に、ブラケット側軸端から固定子に至る
軸方向の溝を形成し、この溝を介して固定子リードを外
部に引き出し、
前記ブラケット側の軸受のブラケット側の位置に磁性材
からなるスリーブを固定軸に嵌着し、前記スリーブと前
記回転子との間に磁性流体シールを設けるようにしたの
で、
固定子リードを引出すための構造は溝となって簡単であ
り、引出し作業も１本づつ埋込むようにして容易でリー
ドの痛みもなくなるという効果があり、スリーブは溝の
中の固定子リードを囲んで保護すると同時に、磁性流体
シールの一部を兼ねるという効果がある。The shaft-fixed outer rotor type spindle motor of this invention group has the following features: - An axial groove is formed on the outer periphery of the fixed shaft, extending from the shaft end on the bracket side to the stator, and the stator lead is connected to the outside through this groove. A sleeve made of a magnetic material is fitted onto the fixed shaft at a position on the bracket side of the bearing on the bracket side, and a magnetic fluid seal is provided between the sleeve and the rotor, so that the stator lead The structure for pulling out the stator leads is simple as it is a groove, and the pulling out work is easy as it is buried one by one, and there is no damage to the leads.The sleeve surrounds and protects the stator leads in the groove, and at the same time , which has the effect of also serving as a part of the magnetic fluid seal.
発明２は更に、ねじ結合する固定軸とブラケットの直角
度をスリーブが確保する効果があり、軸受サイズを上げ
たり、ねじ部を細くて弱いものにすることがないという
効果がある。Invention 2 further has the effect that the sleeve ensures the perpendicularity between the fixed shaft and the bracket to be screwed together, and there is no need to increase the bearing size or make the threaded portion thin and weak.
発明３は更に、溝の外周部の幅は固定子リードの埋込み
に充分確保されたうえで固定軸の断面２次モーメントが
大きく、弱くなりがちな固定軸の根本の剛性が高いとい
う効果がある。Invention 3 further has the effect that the width of the outer periphery of the groove is sufficient for embedding the stator lead, and the second moment of area of the fixed shaft is large, and the rigidity of the base of the fixed shaft, which tends to be weak, is high. .
第１図は実施例の断面図、第２図は第１図の■■断面図
であり、第３図は従来例の断面図、第４図は第３図のＩ
Ｖ−ＩＶ断面図である。
１・・・ブラケット、２・・・ねじ部、３．２３・・・
固定軸、４・・・固定子、５ａ、５ｂ・・・軸受、８・
・・回転子、１０ａ、１０ｂ・・・磁性流体シール、１
１・・・中心穴、１３・・・固定子リード、２１・・・
溝、２２・・・スリーブ。
第
１
図
第
図
第
図Fig. 1 is a sectional view of the embodiment, Fig. 2 is a sectional view of Fig. 1, Fig. 3 is a sectional view of the conventional example, and Fig. 4 is a sectional view of I of Fig. 3.
It is a V-IV sectional view. 1...Bracket, 2...Threaded part, 3.23...
Fixed shaft, 4... Stator, 5a, 5b... Bearing, 8...
...Rotor, 10a, 10b...Magnetic fluid seal, 1
1... Center hole, 13... Stator lead, 21...
Groove, 22...sleeve. Figure 1 Figure 1 Figure 1
Claims (1)
この固定子の両側に配置した一対の軸受とを固定し、こ
の一対の軸受で支承される回転子の内側に前記固定子を
配置してなる外側回転子形スピンドルモータにおいて、 前記固定軸の外周に前記ブラケット側軸端から前記固定
子に至る軸方向の溝を形成し、この溝に固定子リードを
埋設し、 前記ブラケット側の前記軸受の前記ブラケット側の位置
に磁性材からなるスリーブを前記固定軸に嵌着し、前記
スリーブと前記回転子との間に磁性流体シールを設ける
ことを特徴とする外側回転子形スピンドルモータ。 ２）請求項１記載の外側回転子形スピンドルモータにお
いて、 前記固定軸と前記ブラケットとをねじ結合し、このブラ
ケットを前記スリーブに軸方向に当接させることを特徴
とする外側回転子形スピンドルモータ。 ３）請求項１又は２記載の外側回転子形スピンドルモー
タにおいて、 前記溝の幅は前記固定軸の軸心側より外周が狭いことを
特徴とする外側回転子形スピンドルモータ。[Claims] 1) A stator and a pair of bearings arranged on both sides of the stator are fixed to a fixed shaft fixed to one side of the bracket, and the inner side of the rotor supported by the pair of bearings is fixed to a fixed shaft fixed to one side of the bracket. In an outer rotor type spindle motor in which the stator is arranged in an outer rotor type spindle motor, an axial groove is formed on the outer periphery of the fixed shaft extending from the bracket side shaft end to the stator, and a stator lead is embedded in this groove. and a sleeve made of a magnetic material is fitted onto the fixed shaft at a position on the bracket side of the bearing on the bracket side, and a magnetic fluid seal is provided between the sleeve and the rotor. Rotor type spindle motor. 2) The outer rotor type spindle motor according to claim 1, wherein the fixed shaft and the bracket are screwed together, and the bracket is brought into contact with the sleeve in the axial direction. . 3) The outer rotor type spindle motor according to claim 1 or 2, wherein the width of the groove is narrower on the outer periphery than on the axial center side of the fixed shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7431190A JPH03277156A (en) | 1990-03-23 | 1990-03-23 | Outer rotor type spindle motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7431190A JPH03277156A (en) | 1990-03-23 | 1990-03-23 | Outer rotor type spindle motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03277156A true JPH03277156A (en) | 1991-12-09 |
Family
ID=13543455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7431190A Pending JPH03277156A (en) | 1990-03-23 | 1990-03-23 | Outer rotor type spindle motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03277156A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001086703A (en) * | 2000-07-31 | 2001-03-30 | Hitachi Ltd | Spindle motor |
| US11945264B2 (en) | 2018-05-10 | 2024-04-02 | Bridgestone Corporation | Tire wear prediction system, tire wear prediction program, tire wear prediction method and data structure |
-
1990
- 1990-03-23 JP JP7431190A patent/JPH03277156A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001086703A (en) * | 2000-07-31 | 2001-03-30 | Hitachi Ltd | Spindle motor |
| US11945264B2 (en) | 2018-05-10 | 2024-04-02 | Bridgestone Corporation | Tire wear prediction system, tire wear prediction program, tire wear prediction method and data structure |
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