【発明の詳細な説明】〔産業上の利用分野〕本発明は、磁気ディスクを回転せしめる磁気ディスク装
置のスピンドルモータ構造に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a spindle motor structure for a magnetic disk device that rotates a magnetic disk.
本発明は磁気ディスク装置のスピンドルモータに於て、
ステータコイルの円周側にロータマグネットを配設しさ
らにロータマグネットが固定されるロータヨークに送風
機構を付設することにより、スピンドルモータを小型化
薄型化しさらにステータコイルの放熱状態を向上せしめ
信頼性を向上せしめるものである。The present invention provides a spindle motor for a magnetic disk device.
By arranging the rotor magnet on the circumferential side of the stator coil and adding a blower mechanism to the rotor yoke to which the rotor magnet is fixed, the spindle motor is made smaller and thinner, and the heat dissipation state of the stator coil is improved, improving reliability. It is something that forces you to do something.
従来の磁気ディスク装置では、第３図に示されるような
スピンドルモータ構造のものが多い。第３図は従来のス
ピンドルモータの要部断面図であり、ジャス′ト１１の
一端にはハブ２が固定され複数の磁気ディスク３がディ
スクスペーサ４を介してディスククランプ板５によって
７１プ２に装着され、シャフト１の他端にはロータヨー
ク６が固定されロータヨーク乙にはロータマグネット７
が固定されロータマグネット７の円周側に空隙を隔てて
ステータコア８が配設されステータコア８にはステータ
コイル９が巻装され、シャフト１は棚受１０で支承され
シール１１で防塵シールされ、軸受１０やシール１１や
ステータコアはハウジング１２に配役される。ロータマ
グネット７は半径方向に複数極に分割着磁されており、
磁気センサーによりロータマグネット７の位置検出を行
い複数のスロットを有するステータコア８に複数相に分
割巻線されたステータコイル９に順次通電することによ
り回転駆動力を発生し、シャフト１ならびに磁気ディス
ク３を回転せしめる。Many conventional magnetic disk drives have a spindle motor structure as shown in FIG. FIG. 3 is a sectional view of main parts of a conventional spindle motor, in which a hub 2 is fixed to one end of a just 11, and a plurality of magnetic disks 3 are connected to a disk 71 by a disk clamp plate 5 via a disk spacer 4. A rotor yoke 6 is fixed to the other end of the shaft 1, and a rotor magnet 7 is fixed to the rotor yoke B.
is fixed, and a stator core 8 is disposed on the circumferential side of the rotor magnet 7 with a gap in between, a stator coil 9 is wound around the stator core 8, the shaft 1 is supported by a shelf support 10, is dust-proof sealed with a seal 11, and a bearing 10, the seal 11, and the stator core are arranged in the housing 12. The rotor magnet 7 is divided and magnetized into multiple poles in the radial direction.
The position of the rotor magnet 7 is detected by a magnetic sensor, and a rotational driving force is generated by sequentially energizing the stator coil 9, which is divided into multiple phases and wound around the stator core 8 having a plurality of slots, to drive the shaft 1 and the magnetic disk 3. Let it rotate.
〔発明が解決しようとする問題点及び目的〕しかし、前
述の従来技術ではロータヨークの磁気ディスク装置に占
める肉厚が大きく磁気ディスク装置の小型化薄型化に適
さないばかりでなく、ロータヨークでステータコイルが
囲まれる配置になっており磁気ディスクの搭載枚数が増
しスピンドルモータの必要起動トルクが増してステータ
コイルに流す電流が増した場合ステータコイルの焼損の
危険性があジ、定常回転時でもステータコイル部分が他
の部分に比べ著しく温度が上昇し磁気ディスク装置内部
の温度分布が不均一になりオフトラックを生じてしまう
という問題を有する。そこで本発明はこのような問題点
を解決するもので、その目的とするところは、小型化薄
型化されイ言頼性を向上した磁気ディスク装置を提供す
るところにある。[Problems and objects to be solved by the invention] However, in the above-mentioned conventional technology, the rotor yoke occupies a large wall thickness in the magnetic disk device, which is not only unsuitable for miniaturizing and thinning the magnetic disk device, but also makes it difficult for the stator coil to be removed by the rotor yoke. As the number of magnetic disks mounted increases, the required starting torque of the spindle motor increases, and the current flowing through the stator coil increases.There is a risk of burnout of the stator coil.Even during steady rotation, the stator coil portion There is a problem in that the temperature of the magnetic disk device increases significantly compared to other parts, and the temperature distribution inside the magnetic disk device becomes uneven, resulting in off-track. SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and its purpose is to provide a magnetic disk device that is smaller and thinner and has improved reliability.
本発明のスピンドルモータは、複数極に分獲り着磁され
たロータマグネットと複数相に分割巻線されたステータ
コイルとの電気磁気的な作用により回転駆動力を発生し
、前記ロータマグネットと１司−シャフトに固定される
ノ・プにａ気記録媒体である磁気ディスクを複数枚搭載
し回転せしめる磁気ディスク装置のスピンドルモータに
於て、前記ステータコイルの巻装されるステータコアの
円周側ＩＪに空隙を隔てて前記ロータマグネットを配設
し、前記ロータマグネットはその円周でロータヨークに
固定され、前記ロータヨークに送風機能を付設したこと
を特徴とする。The spindle motor of the present invention generates a rotational driving force by electromagnetic action between a rotor magnet magnetized into multiple poles and a stator coil divided into multiple phases. In a spindle motor of a magnetic disk device in which a plurality of magnetic disks, which are a recording medium, are mounted on a knob fixed to a shaft and rotated, the IJ on the circumferential side of the stator core around which the stator coil is wound. The rotor magnet is arranged with a gap in between, the rotor magnet is fixed to the rotor yoke at its circumference, and the rotor yoke is provided with an air blowing function.
本発明の上記の構成によれば、回転部分の値組及び回転
占有体積を減少し、ステータコイルを回転部分の外部に
配置することができ、ロータヨーク等の回転部分にステ
ータコイルを冷却する機能を持たせることができる。According to the above configuration of the present invention, it is possible to reduce the value set and the rotational occupied volume of the rotating part, to arrange the stator coil outside the rotating part, and to provide the rotating part such as the rotor yoke with the function of cooling the stator coil. You can have it.
第１図は本発明の実施例に於るスピンドルモータの要部
断面図であり、各部の名称は第３図の従来例と同様であ
るから省略するが、構造上従来例と異なるのは、シャフ
ト１に固定されるロータヨーク６及びロータヨーク６に
固定されるロータマグネット７カζステータコイル９の
巻装されるステータコア８０円周側に空隙を隔てて配設
されているところである。ここでロータマグネット７は
従来のものよりも高性能なフェライトマグネットや希土
類等のマグネットを使用し十分な磁束を得ることが可能
になりロータマグネット７をステータコア８の円周側に
配設してもトルク特性は余り劣化せず、またステータコ
イル９に許される巻線スペースやステータコア８の磁路
断面積も十分小型化薄型化に対応可能である。しかもス
テータコア８の表面積は増加しているのでステータコイ
ル９の放熱に有利であり回転ロック時の焼損が防止でき
、大電流を流しても信頼性−失わない。さらに、第２図
のロータ概観図に示されるように、ロータマグネット７
の固定されるロータヨーク６に送風羽根１３を設けるこ
とにより、ロータヨーク６からステータコイル９へ通常
回転時送風され、ステータコイル９の温度上昇を押さえ
ると共にステータコイル９の発熱による磁気ディスク５
の温度上昇も押さえ温度分布を均一にすることが出来磁
気ディスク装置へ組み込まれたときのオフトラックも低
減できる。さらに、回転部分の直径が小さくナリ、磁気
ディスク装置にスピンドルモータが実装されたとｔのス
ピンドルモータ下部への回路部品の実装スペースが増大
する。さらに、スピンドルセータ単体での回転部分慣性
モーメントが小さくできるため、磁気ディスクの回転起
動停止時間も低減でき磁気ディスク装置の信頼性は向上
する。FIG. 1 is a sectional view of the main parts of a spindle motor according to an embodiment of the present invention, and the names of each part are omitted because they are the same as those of the conventional example shown in FIG. 3, but the differences in structure from the conventional example are as follows. A rotor yoke 6 fixed to the shaft 1 and seven rotor magnets fixed to the rotor yoke 6 are arranged on the circumferential side of a stator core 80 around which a stator coil 9 is wound, with a gap in between. Here, the rotor magnet 7 uses a ferrite magnet, rare earth magnet, etc., which has higher performance than conventional magnets, and it is possible to obtain sufficient magnetic flux. Even if the rotor magnet 7 is arranged on the circumferential side of the stator core 8 The torque characteristics do not deteriorate much, and the winding space allowed for the stator coil 9 and the magnetic path cross-sectional area of the stator core 8 can be sufficiently reduced in size and thickness. Moreover, since the surface area of the stator core 8 is increased, it is advantageous for heat dissipation of the stator coil 9, and burnout when the rotation is locked can be prevented, and reliability will not be lost even when a large current is applied. Furthermore, as shown in the rotor overview diagram of FIG. 2, the rotor magnet 7
By providing the air blowing blades 13 on the rotor yoke 6 to which the rotor yoke 6 is fixed, air is blown from the rotor yoke 6 to the stator coil 9 during normal rotation, suppressing the rise in temperature of the stator coil 9, and suppressing the increase in the temperature of the magnetic disk 5 due to the heat generated by the stator coil 9.
It is possible to suppress the temperature rise, make the temperature distribution uniform, and reduce off-track when incorporated into a magnetic disk device. Furthermore, when a spindle motor is mounted on a magnetic disk device because the diameter of the rotating portion is small, the mounting space for circuit components under the spindle motor increases. Furthermore, since the rotational partial moment of inertia of the spindle rotor alone can be reduced, the time for starting and stopping the rotation of the magnetic disk can be reduced, and the reliability of the magnetic disk device can be improved.
以上述べたように本発明によれば、磁気ディスク装にの
スピンドルモータ全小型化薄型化し、ステータコイルの
放熱状態全向上し温度上昇を低減し温度分布を均一化し
ロック時の焼損を防止し、十分な起動トルクを得る信頼
性の高いスピンドルモータを提供できるという効果を有
し、特に五５インチや５．２５インチの小型磁気ディス
ク装置に用いると効果は大きい。As described above, according to the present invention, the spindle motor of the magnetic disk drive is completely downsized and thinned, the heat dissipation state of the stator coil is completely improved, the temperature rise is reduced, the temperature distribution is made uniform, and burnout during locking is prevented. This has the effect of providing a highly reliable spindle motor that can obtain sufficient starting torque, and is particularly effective when used in small-sized magnetic disk drives of 55 inches and 5.25 inches.
第１図は本発明のスピンドルモータの一実施例を示す要
部断面図、第２図は送風機能の一実施例を示すロータ概
観図、第３図は従来のスピンドルモータの要部断面図。１・・・・・・シャフト２・・・・・・ハブ３・・・・・・磁気ディスク６・・・・・・ロータ、ヨーク７・・・・・・ロータマグネット８・・・・・・スｆ−タコア９・・・・・・ステータコイル１３・・・・・・送風羽根以 上出願人 セイコーエプソン株式会社他１名ｌ； ン（址 ７： ）クーｑり１°°
偏トユ： １＼１° ｇ： スそν９
づ１１３： 刃区我−ｒ′１スク り： １
后−１つイ】しｂ：Ｉ′１−ｃｉっ−クｂ二〇−９つ−１’７ ： ｒｌ−ｑ４イネ斗ｉ、３：Ｌ載羽１−０−１：３槁り礼）目第２図FIG. 1 is a sectional view of an essential part of a spindle motor according to an embodiment of the present invention, FIG. 2 is an overview of a rotor showing an embodiment of a blower function, and FIG. 3 is a sectional view of an essential part of a conventional spindle motor. 1...Shaft 2...Hub 3...Magnetic disk 6...Rotor, yoke 7...Rotor magnet 8...・Stator coil 13...Blower blade or more Applicant: Seiko Epson Corporation and 1 other person l;
Polarization: 1\1° g: Suso ν9
zu113: Blade Ward Ga-r'1 Skri: 1
Back - 1st I] Shib: I'1-ci-ku b 20-9th-1 '7: rl-q4 Ineto i, 3: L Zaiu 1- 0-1: 3 Kairei ) Figure 2
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26528485AJPS62125573A (en) | 1985-11-26 | 1985-11-26 | spindle motor |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26528485AJPS62125573A (en) | 1985-11-26 | 1985-11-26 | spindle motor |
| Publication Number | Publication Date |
|---|---|
| JPS62125573Atrue JPS62125573A (en) | 1987-06-06 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26528485APendingJPS62125573A (en) | 1985-11-26 | 1985-11-26 | spindle motor |
| Country | Link |
|---|---|
| JP (1) | JPS62125573A (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0869494A1 (en)* | 1997-04-01 | 1998-10-07 | Papst Licensing GmbH | Disk storage device with improved spindle torque and acceleration |
| EP0869495A1 (en)* | 1997-04-01 | 1998-10-07 | Papst Licensing GmbH | Disk storage device with improved spindle torque and acceleration |
| EP1505591A2 (en) | 1997-04-01 | 2005-02-09 | Papst Licensing GmbH & Co. KG | Disk storage device with improved spindle torque and acceleration |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0869494A1 (en)* | 1997-04-01 | 1998-10-07 | Papst Licensing GmbH | Disk storage device with improved spindle torque and acceleration |
| EP0869495A1 (en)* | 1997-04-01 | 1998-10-07 | Papst Licensing GmbH | Disk storage device with improved spindle torque and acceleration |
| WO1998044500A1 (en)* | 1997-04-01 | 1998-10-08 | Papst Licensing Gmbh | Disk storage device with improved spindle torque and acceleration |
| US5877916A (en)* | 1997-04-01 | 1999-03-02 | Papst; Georg F. | Disk storage device with stator-rotor positioning providing improved spindle torque and acceleration |
| US6005746A (en)* | 1997-04-01 | 1999-12-21 | Papst Licensing Gmbh & Co. Kg | Disk storage device with improved spindle torque and acceleration |
| EP1505591A2 (en) | 1997-04-01 | 2005-02-09 | Papst Licensing GmbH & Co. KG | Disk storage device with improved spindle torque and acceleration |
| EP1505591A3 (en)* | 1997-04-01 | 2005-03-02 | Papst Licensing GmbH & Co. KG | Disk storage device with improved spindle torque and acceleration |
| EP1881497A1 (en)* | 1997-04-01 | 2008-01-23 | Papst Licensing GmbH & Co. KG | Disk storage device with improved spindle torque and acceleration |
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