JPH02179256A - Speed detector - Google Patents
Speed detectorInfo
- Publication number
- JPH02179256A JPH02179256A JP63333024A JP33302488A JPH02179256A JP H02179256 A JPH02179256 A JP H02179256A JP 63333024 A JP63333024 A JP 63333024A JP 33302488 A JP33302488 A JP 33302488A JP H02179256 A JPH02179256 A JP H02179256A
- Authority
- JP
- Japan
- Prior art keywords
- voice coil
- speed detection
- speed
- coil
- bar magnet
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 39
- 230000004907 flux Effects 0.000 claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 10
- 230000008878 coupling Effects 0.000 claims abstract description 6
- 238000010168 coupling process Methods 0.000 claims abstract description 6
- 238000005859 coupling reaction Methods 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims description 49
- 229920006395 saturated elastomer Polymers 0.000 abstract description 3
- 230000009471 action Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
Description
【発明の詳細な説明】
〔概 要〕
ボイスコイルモータのアクセス制御に使用される速度検
出装置に関し、
速度検出装置の小型化を行うと共に、ボイスコイルによ
る相互インダクタンスの影響を受けない速度検出装置の
提供を目的とし、
平行する２本の鉄心を有する閉磁路の一方の鉄心に棒磁
石をその長手方向に併設すると共に、当該棒磁石は前記
鉄心に流れる磁束を飽和させるだけの磁束密度を有し、
当該棒磁石を含む鉄心と、前記棒磁石を含まない鉄心と
の何れか一方に速度検出コイルを可動線輪状に巻回し、
他方にボイスコイルモータを構成するためのボイスコイ
ルを巻回し、前記速度検出コイルと前記ボイスコイルと
が前記鉄心に対して一体的に平行移動できる連結機構を
設け、前記ボイスコイルで駆動される速度に対応して前
記速度検出コイルに発生する電圧により速度を検出する
ように構成する。[Detailed Description of the Invention] [Summary] Regarding a speed detection device used for access control of a voice coil motor, the present invention aims to reduce the size of the speed detection device and to develop a speed detection device that is not affected by mutual inductance due to the voice coil. For the purpose of providing a closed magnetic circuit having two parallel cores, a bar magnet is installed along the longitudinal direction of one core of the closed magnetic circuit, and the bar magnet has a magnetic flux density sufficient to saturate the magnetic flux flowing through the core. ,
Winding a speed detection coil in a movable ring shape around either the iron core including the bar magnet or the iron core not including the bar magnet,
A voice coil for configuring a voice coil motor is wound on the other side, and a coupling mechanism is provided that allows the speed detection coil and the voice coil to integrally move parallel to the iron core, and the speed driven by the voice coil is determined. The speed is detected by a voltage generated in the speed detection coil in response to the speed detection coil.
本発明は、ボイスコイルモータ（Ｖｏｉｃｅ Ｃｏｉ１
Ｍｏｔｏｒ以下ＶＣＭと略称する）のアクセス制御に使
用される速度検出装置に関する。The present invention provides a voice coil motor (Voice Coi1).
The present invention relates to a speed detection device used for access control of Motor (hereinafter abbreviated as VCM).
近年、光デイスク装置等の高速アクセスへの要求に伴い
、ＶＣＭ制御が重要な位置を占めている。In recent years, with the demand for high-speed access for optical disk devices and the like, VCM control has assumed an important position.
さらに光デイスク装置の場合は、ＶＣＭが速度センサを
有し、この出力をＶＣＭのフィードバック制御に利用す
ることにより高速かつ高性能な制御が実現できる。Further, in the case of an optical disk device, the VCM has a speed sensor, and by using the output of this sensor for feedback control of the VCM, high-speed and high-performance control can be realized.
また、光デイスク装置の小型化への要求に伴い、速度検
出装置及びＶＣＭ装置の小型化も必要とされている。今
までは、ＶＣＭ装置とは別に速度検出用の磁気回路を作
り速度を検出していた。しかし、小型化に伴いスペース
を有効に利用する必要があり、そのために一つの磁気回
路をＶＣＭ及び速度検出用に使用する工夫が望まれてい
る。Additionally, with the demand for smaller optical disk devices, there is also a need for smaller speed detection devices and VCM devices. Until now, a magnetic circuit for speed detection was made separately from the VCM device to detect speed. However, with miniaturization, it is necessary to use space effectively, and for this reason, it is desired to use one magnetic circuit for VCM and speed detection.
〔従来の技術〕
第３図は従来の速度検出装置の要部断面図を示す。図に
おいて、１は閉磁路であって互いに平行する鉄心１ａと
鉄心１ｂとを有する。２は棒磁石であって閉磁路ｌに所
要の磁束密度を与えている。３はＶＣＭであってボイス
コイル４が鉄心１ｂに可動線輪状に巻回されている。５
は閉磁路であってボイスコイル４が作る磁束の影響を受
けない場所に配置されている。５ａと５ｂは互いに平行
する鉄心、６は棒磁石であって閉磁路５に所要の磁束密
度を与えている。７は速度検出コイルであって、鉄心５
ｂに可動線輪状に巻回されている。８はボイスコイル４
と速度検出コイル７とが鉄心１ｂ、５ｂに対して一体的
に平行移動できるように連結する連結機構であって、非
磁性体の部材で形成され、これを支持する可撓機構につ
いては記載を省略している。[Prior Art] FIG. 3 shows a sectional view of essential parts of a conventional speed detection device. In the figure, reference numeral 1 denotes a closed magnetic circuit having an iron core 1a and an iron core 1b that are parallel to each other. 2 is a bar magnet that provides the required magnetic flux density to the closed magnetic path l. 3 is a VCM in which a voice coil 4 is wound around an iron core 1b in the form of a movable ring. 5
is a closed magnetic path and is placed in a place that is not affected by the magnetic flux produced by the voice coil 4. 5a and 5b are iron cores parallel to each other, and 6 is a bar magnet, which provides the closed magnetic path 5 with a required magnetic flux density. 7 is a speed detection coil, and the iron core 5
b is wound in a movable ring shape. 8 is voice coil 4
A connecting mechanism that connects the speed detecting coil 7 and the speed detecting coil 7 so that they can integrally move parallel to the iron cores 1b and 5b, and is made of a non-magnetic material, and the flexible mechanism that supports this is not described. It is omitted.
ＶＣＭ３の機能は、ボイスコイル４に流す電流を制御す
ることにより所望の速度が得られることは周知の通りで
ある。この時、速度検出コイル７はボイスコイル４と一
体的に連動するからその速度に対応して速度検出コイル
７に電圧が発生し、速度検出ができる。しかしながら、
この速度検出装置は２個の閉磁路を利用するため小型化
ができない欠点がある。As is well known, the function of the VCM 3 is to obtain a desired speed by controlling the current flowing through the voice coil 4. At this time, since the speed detection coil 7 is integrally linked with the voice coil 4, a voltage is generated in the speed detection coil 7 corresponding to the speed, and speed can be detected. however,
This speed detection device has the disadvantage that it cannot be miniaturized because it uses two closed magnetic circuits.
第４図は、従来の閉磁路１個の速度検出装置の要部断面
図を示す。この例は第３図の欠点を解消するために考案
された機構であって、同一部位には同じ符号を付してい
る。鉄心１ｂに互いに隣接したボイスコイル４゛と速度
検出コイル７°を可動線輪状に巻回したものである。こ
の方法により小型化は可能となるが、同じ鉄心１ｂに隣
接して２つのコイルがあるため相互インダクタンスによ
り、ボイスコイル４“を流れる電流によって速度検出コ
イル７゛に電圧が誘起してしまい、この誘起電圧が速度
による起電力に加算されたものを検出することになり、
正確な速度検出にならない欠点がある。FIG. 4 shows a sectional view of a main part of a conventional speed detection device with one closed magnetic circuit. This example is a mechanism devised to eliminate the drawbacks shown in FIG. 3, and the same parts are given the same reference numerals. A voice coil 4' and a speed detection coil 7' adjacent to each other are wound around an iron core 1b in a movable ring shape. Although miniaturization is possible with this method, since there are two coils adjacent to the same iron core 1b, a voltage is induced in the speed detection coil 7' by the current flowing through the voice coil 4' due to mutual inductance. The induced voltage added to the electromotive force due to speed is detected,
There is a drawback that accurate speed detection is not possible.
従って、ＶＣＭ装置の小型化に伴う速度検出装置の小型
化が十分にできず、小型化しようとするとＶＣＭと速度
検出装置との間隔が小さくなり、ボイスコイルからの相
互インダクタンスの影響を大きく受けるという問題が生
じてきた。Therefore, as the VCM device becomes smaller, the speed detection device cannot be made smaller enough, and if miniaturization is attempted, the distance between the VCM and the speed detection device becomes smaller, and the effect of mutual inductance from the voice coil becomes large. A problem has arisen.
本発明は、上記従来の問題点に鑑みて創作されたもので
、速度検出装置の小型化を行うと共に、ボイスコイルに
よる相互インダクタンスの影響を受けない速度検出装置
の提供を目的とする。The present invention was created in view of the above conventional problems, and aims to reduce the size of a speed detection device and provide a speed detection device that is not affected by mutual inductance due to a voice coil.
第１図は、本発明の構造を示す要部断面図である。平行
する２本の鉄心１ａ、Ｉｂを有する閉磁路１の一方の鉄
心１ａに棒磁石２をその長手方向に併設すると共に、当
該棒磁石２は前記鉄心１ａ、 １ｂに流れる磁束を飽和
させるだけの磁束密度を有し、当該棒磁石２を含む鉄心
１ａと、前記棒磁石２を含まない鉄心１ｂとの何れか一
方に速度検出コイル７を可動線輪状に巻回し、他方にボ
イスコイルモータ３を構成するためのボイスコイル（４
）を巻回し、前記速度検出コイル７と前記ボイスコイル
４とが前記鉄心１ａ、 １ｂに対して一体的に平行移動
できる連結機構９を設け、前記ボイスコイル４で駆動さ
れる速度に対応して前記速度検出コイル７に発生する電
圧により速度を検出するように構成する。FIG. 1 is a sectional view of a main part showing the structure of the present invention. A bar magnet 2 is installed in the longitudinal direction of one of the iron cores 1a of a closed magnetic circuit 1 having two parallel iron cores 1a and Ib, and the bar magnet 2 is arranged so as to saturate the magnetic flux flowing through the iron cores 1a and 1b. A speed detection coil 7 is wound in a movable ring shape around one of the iron core 1a which has a magnetic flux density and includes the bar magnet 2, and the iron core 1b which does not include the bar magnet 2, and the voice coil motor 3 is wound around the other. Voice coils (4
), and a coupling mechanism 9 is provided that allows the speed detection coil 7 and the voice coil 4 to integrally move in parallel with the iron cores 1a and 1b, and The configuration is such that the speed is detected by the voltage generated in the speed detection coil 7.
ボイスコイル４に電流が流れると、この電流に対応して
磁束Ｂが発生する。閉磁路１の鉄心１ａ。When a current flows through the voice coil 4, a magnetic flux B is generated in response to this current. Iron core 1a of closed magnetic path 1.
Ｉｂは棒磁石２によりその磁束密度が飽和しているため
磁束Ｂは鉄心を通ることができず、破線で示すように鉄
心の外側を流れる。磁束Ｂは速度検出コイルに鎖交しな
いように両コイルの間隔が設定されているため相互イン
ダクタンスは小さくなり、第２図に示すように速度検出
コイル８に発生する相互インダクタンスＭによる誘起電
圧Ｅｓは小さくなる。従って、速度に対応した誤差の少
ない電圧を検出することができる。Since the magnetic flux density of Ib is saturated by the bar magnet 2, the magnetic flux B cannot pass through the iron core and flows outside the iron core as shown by the broken line. Since the distance between the two coils is set so that the magnetic flux B does not interlink with the speed detection coil, the mutual inductance becomes small, and the induced voltage Es due to the mutual inductance M generated in the speed detection coil 8 is as shown in FIG. becomes smaller. Therefore, it is possible to detect a voltage with little error corresponding to the speed.
以下本発明の実施例を図面によって詳述する。 Embodiments of the present invention will be described in detail below with reference to the drawings.
なお、構成、動作の説明を理解し易くするために全図を
通じて同一部分には同一符号を付してその重複説明を省
略する。Note that, in order to make the explanation of the configuration and operation easier to understand, the same parts are given the same reference numerals throughout all the figures, and repeated explanation thereof will be omitted.
第１図は本発明の構造を示す要部断面図である。FIG. 1 is a sectional view of a main part showing the structure of the present invention.
図において、ＶＣＭ３を構成するボイスコイル４は鉄心
１ｂに巻回され、速度検出コイル７は棒磁石２を含む鉄
心１ａに可動線輪状に巻回されている。In the figure, a voice coil 4 constituting a VCM 3 is wound around an iron core 1b, and a speed detection coil 7 is wound around an iron core 1a including a bar magnet 2 in a movable ring shape.
両コイルの位置はその巻回する磁心を反対にしても効果
は同じである。棒磁石２は鉄心１ａ、 １ｂに流れる磁
束を飽和させるだけの磁束密度を有するものが用いられ
る。The effect is the same even if the positions of both coils are opposite to the magnetic cores around which they are wound. The bar magnet 2 used has a magnetic flux density sufficient to saturate the magnetic flux flowing through the iron cores 1a and 1b.
９はボイスコイル４と速度検出コイル７とが閉磁路１を
構成する平行した鉄心１ａと１ｂに対して一体的に平行
移動できるように連結する連結機構であって、非磁性体
の部材で形成され、これを支持する可撓機構については
記載を省略している。Reference numeral 9 denotes a connecting mechanism that connects the voice coil 4 and the speed detection coil 7 so that they can move integrally in parallel to the parallel iron cores 1a and 1b forming the closed magnetic path 1, and is made of a non-magnetic material. The description of the flexible mechanism that supports this is omitted.
破線で示すＢはボイスコイル４に電流が流れた時に、こ
の電流に対応して発生する磁束の通路を示したもので、
閉磁路１の鉄心１ａ、 １ｂは棒磁石２によりその磁束
密度が飽和しているため、磁束Ｂは鉄心を通ることがで
きず、破線で示すように鉄心の外側を流れる。この磁束
Ｂが速度検出コイル７と鎖交しないように予め両コイル
の間隔が設定されている。具体的な閉磁路ｌの外側寸法
の一例としては５０ｍｍ Ｘ １５ｍｍに形成すること
ができた。The broken line B indicates the path of the magnetic flux generated in response to the current flowing through the voice coil 4.
Since the magnetic flux density of the iron cores 1a and 1b of the closed magnetic path 1 is saturated by the bar magnet 2, the magnetic flux B cannot pass through the iron core and flows outside the iron core as shown by the broken line. The interval between both coils is set in advance so that this magnetic flux B does not interlink with the speed detection coil 7. As a specific example of the outer dimensions of the closed magnetic path l, it was possible to form it to 50 mm x 15 mm.
ボイスコイル４に流れる電流を制御することによりＶＣ
Ｍ３としての作用が行われ、所望の制御速度が得られる
。速度検出コイル７はボイスコイル４と一体的に平行移
動するからその速度に対応する電圧が得られる。By controlling the current flowing through the voice coil 4, the VC
The action as M3 is performed, and the desired control speed is obtained. Since the speed detection coil 7 moves in parallel with the voice coil 4, a voltage corresponding to the speed can be obtained.
第２図は相互インダクタンスと速度検出コイルの出力電
圧の特性図を示す。ボイスコイル４と速度検出コイル７
との相互インダクタンスをＭ、速度検出コイル７の相互
インダクタンスＭに対応する出力電圧をＥｓ、ボイスコ
イル４に流れる電流をＩν、時間をｔとすると、
Ｍｘｄ■Ｖ／ｄｔ＝Ｅｓ・・・・■
なる関係があり、特性図に示すように相互インダクタン
スＭが小さくなる程遠度検出コイル７の相互インダクタ
ンスＭに対応する出力電圧Ｅｓは小さくなる。即ち、誤
差成分が小さくなり、速度検出コイル７の出力は速度だ
けに対応する電圧となり、正確に速度が検出できる。FIG. 2 shows a characteristic diagram of the mutual inductance and the output voltage of the speed detection coil. Voice coil 4 and speed detection coil 7
If the mutual inductance with the speed detection coil 7 is M, the output voltage corresponding to the mutual inductance M of the speed detection coil 7 is Es, the current flowing through the voice coil 4 is Iν, and the time is t, then Mxd■V/dt=Es...■ As shown in the characteristic diagram, as the mutual inductance M becomes smaller, the output voltage Es corresponding to the mutual inductance M of the distance detection coil 7 becomes smaller. That is, the error component becomes small, the output of the speed detection coil 7 becomes a voltage corresponding only to the speed, and the speed can be detected accurately.
以上の説明から明らかなように本発明によれば、速度検
出装置は小型化でき、ＶＣＭの速度のみを有効に検出で
きるので、高性能なＶＣＭのフィードバック制御に寄与
するところが大きいという効果がある。As is clear from the above description, according to the present invention, the speed detection device can be miniaturized and only the speed of the VCM can be effectively detected, which has the effect of greatly contributing to high-performance feedback control of the VCM.
第１図は本発明の構造を示す要部断面図、第２図は相互
インダクタンスと速度検出コイルの出力電圧の特性図、
第３図は従来の速度検出装置の要部断面図、第４図は従
来の閉磁路１個の速度検出装置の要部断面図を示す。
第１図において、■は閉磁路、１ａと１ｂは鉄心、２は
棒磁石、３はＶＣＭ、４はボイスコイル、７は速度検出
コイル、９は連結機構をそれぞれ示す。
用シーイ〉ダクタシス Ｍ
序臼ユインダクタシス乙述例し突出フィルの出力電后切
将・ｐ主圓第３図Fig. 1 is a sectional view of the main part showing the structure of the present invention, Fig. 2 is a characteristic diagram of mutual inductance and the output voltage of the speed detection coil, Fig. 3 is a sectional view of the main part of the conventional speed detection device, and Fig. 4 1 shows a sectional view of a main part of a conventional speed detection device with one closed magnetic path. In FIG. 1, ■ is a closed magnetic circuit, 1a and 1b are iron cores, 2 is a bar magnet, 3 is a VCM, 4 is a voice coil, 7 is a speed detection coil, and 9 is a coupling mechanism. For example, the output of the protruding fill is shown in Fig. 3.
Claims (1)
）の一方の鉄心（１ａ）に棒磁石（２）をその長手方向
に併設すると共に、当該棒磁石（２）は前記鉄心（１ａ
、１ｂ）に流れる磁束を飽和させるだけの磁束密度を有
し、当該棒磁石（２）を含む鉄心（１ａ）と、前記棒磁
石（２）を含まない鉄心（１ｂ）との何れか一方に速度
検出コイル（７）を可動線輪状に巻回し、他方にボイス
コイルモータ（３）を構成するためのボイスコイル（４
）を巻回し、前記速度検出コイル（７）と前記ボイスコ
イル（４）とが前記鉄心（１ａ、１ｂ）に対して一体的
に平行移動できる連結機構（９）を設け、前記ボイスコ
イル（４）で駆動される速度に対応して前記速度検出コ
イル（７）に発生する電圧により速度を検出することを
特徴とする速度検出装置。A closed magnetic circuit (1) with two parallel iron cores (1a, 1b)
), a bar magnet (2) is provided along the longitudinal direction of one of the iron cores (1a), and the bar magnet (2) is attached to one of the iron cores (1a).
, 1b) and has a magnetic flux density sufficient to saturate the magnetic flux flowing through the bar magnet (2), either the iron core (1a) containing the bar magnet (2) or the iron core (1b) not containing the bar magnet (2). A speed detection coil (7) is wound in a movable ring shape, and a voice coil (4) for forming a voice coil motor (3) is wound on the other side.
) is wound, and a coupling mechanism (9) is provided that allows the speed detection coil (7) and the voice coil (4) to integrally move parallel to the iron core (1a, 1b), and the voice coil (4) ) A speed detection device detects speed by a voltage generated in the speed detection coil (7) corresponding to the speed driven by the speed detection coil (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63333024A JP2560466B2 (en) | 1988-12-27 | 1988-12-27 | Speed detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63333024A JP2560466B2 (en) | 1988-12-27 | 1988-12-27 | Speed detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02179256A true JPH02179256A (en) | 1990-07-12 |
| JP2560466B2 JP2560466B2 (en) | 1996-12-04 |
Family
ID=18261425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63333024A Expired - Lifetime JP2560466B2 (en) | 1988-12-27 | 1988-12-27 | Speed detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2560466B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR960701503A (en) * | 1993-02-13 | 1996-02-24 | 랄프 홀거 베렌스·페터 뢰저 | DC / DC converter |
-
1988
- 1988-12-27 JP JP63333024A patent/JP2560466B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR960701503A (en) * | 1993-02-13 | 1996-02-24 | 랄프 홀거 베렌스·페터 뢰저 | DC / DC converter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2560466B2 (en) | 1996-12-04 |
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