JPH04212016A - Rotation number detector - Google Patents
Rotation number detectorInfo
- Publication number
- JPH04212016A JPH04212016A JP5708491A JP5708491A JPH04212016A JP H04212016 A JPH04212016 A JP H04212016A JP 5708491 A JP5708491 A JP 5708491A JP 5708491 A JP5708491 A JP 5708491A JP H04212016 A JPH04212016 A JP H04212016A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- permanent magnet
- bubble
- magnetic bubble
- rotating
- 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
- 239000011347 resin Substances 0.000 claims description 16
- 229920005989 resin Polymers 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 2
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 abstract description 22
- 230000004907 flux Effects 0.000 abstract description 13
- 230000005415 magnetization Effects 0.000 abstract description 9
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 abstract 2
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 230000005389 magnetism Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、回転電機や回転軸の
回転量を絶対値で検出する多回転絶対値検出器に用いる
回転数検出器に関し、特に磁気バブル素子を利用した回
転数検出器に関するものである。[Industrial Application Field] This invention relates to a rotation speed detector used in a multi-rotation absolute value detector that detects the amount of rotation of a rotating electric machine or a rotating shaft in absolute value, and in particular to a rotation speed detector using a magnetic bubble element. It is related to.
【０００２】0002
【従来の技術】従来より、回転軸の多回転角度を精度よ
く測定するために、１回転以内の回転角を測定する絶対
値エンコーダと、この絶対値エンコーダの回転数を検出
する回転数検出器とを組合せて測定する装置がある。[Prior Art] Conventionally, in order to accurately measure multiple rotation angles of a rotating shaft, an absolute value encoder that measures the rotation angle within one rotation and a rotation speed detector that detects the rotation speed of this absolute value encoder have been used. There is a device that measures this in combination.
【０００３】この回転数検出器として磁気バブル素子が
利用され、例えば特開昭６２−２６１０１６号公報及び
特開昭６３−２３５８１３号公報に示されるように、駆
動磁界の回転に応じて磁気バブルを順次転送し、その転
送パターン上の磁気バブル位置から回転軸の回転数を検
出するもので、磁気バブルの転送は電源が遮断されても
動作して回転数の検出を可能とする。[0003] A magnetic bubble element is used as this rotation speed detector, and as shown in, for example, Japanese Patent Application Laid-open No. 62-261016 and Japanese Patent Application Laid-Open No. 63-235813, a magnetic bubble element is used as the rotation speed detector. Transfer is performed sequentially, and the number of rotations of the rotating shaft is detected from the positions of magnetic bubbles on the transfer pattern. Magnetic bubble transfer operates even when the power is cut off, making it possible to detect the number of rotations.
【０００４】図８はこのような従来の多回転絶対値検出
器の一例の一部縦断面図、図９はその多回転計測部を示
す図８のＡ−Ａ線断面図である。図において、１は非磁
性材料からなる回転軸、２は１回転内の絶対値を検出す
る１回転内絶対値エンコーダ、３は多回転計測部、４は
回転軸１に固着され、Ｓ，Ｎ極が等間隔かつ交互に４極
着磁された回転永久磁石である。５は磁気バブル素子で
、図１０に示すように磁気バブルチップ６がＸコイル７
、Ｙコイル８で捲回され、角板状で両側面から、Ｓ，Ｎ
極に着磁されたバイアス永久磁石９，１０により挟まれ
ている。バイアス永久磁石９は磁気バブルチップ６側が
Ｎ極で、他方の側がＳ極、バイアス永久磁石１０は磁気
バブルチップ６側がＳ極、他方の側がＮ極に着磁されて
いる。FIG. 8 is a partial vertical cross-sectional view of an example of such a conventional multi-rotation absolute value detector, and FIG. 9 is a cross-sectional view taken along the line A--A in FIG. 8 showing the multi-rotation measuring section. In the figure, 1 is a rotating shaft made of non-magnetic material, 2 is an absolute value encoder within one rotation that detects the absolute value within one rotation, 3 is a multi-rotation measuring section, 4 is fixed to the rotating shaft 1, S, N It is a rotating permanent magnet with four poles magnetized at equal intervals and alternately. 5 is a magnetic bubble element, and as shown in FIG.
, is wound with a Y coil 8, is shaped like a square plate, and has S, N coils from both sides.
It is sandwiched between bias permanent magnets 9 and 10 which are polarized. The bias permanent magnet 9 has a north pole on the magnetic bubble chip 6 side and a south pole on the other side, and the bias permanent magnet 10 has an south pole on the magnetic bubble chip 6 side and a north pole on the other side.
【０００５】磁気バブルチップ６は、図１１に示すよう
に基板６ａ上に設けた転送パターン６ｂと、バブル発生
コイル６ｃ及び磁気抵抗素子からなるバブル検出器６ｄ
で構成されている。なお、６ｅは磁気バブルである。As shown in FIG. 11, the magnetic bubble chip 6 includes a transfer pattern 6b provided on a substrate 6a, and a bubble detector 6d consisting of a bubble generating coil 6c and a magnetoresistive element.
It consists of Note that 6e is a magnetic bubble.
【０００６】図８の１１は樹脂部で、磁気バブルチップ
６、Ｘコイル７、Ｙコイル８、バイアス永久磁石９，１
０を一体にモールド成形している。１２，１３は磁気遮
蔽材料で構成された磁気遮蔽カバー、１４は非磁性体材
料からなる磁気バブル素子５の支持枠である。Reference numeral 11 in FIG. 8 is a resin section, which includes a magnetic bubble chip 6, an X coil 7, a Y coil 8, and bias permanent magnets 9 and 1.
0 is integrally molded. 12 and 13 are magnetic shielding covers made of magnetic shielding material, and 14 is a support frame for the magnetic bubble element 5 made of nonmagnetic material.
【０００７】上記のように構成された多回転絶対値検出
器では、バイアス永久磁石９，１０による一方向磁界に
より、磁気バブルチップ６の磁化方向は一定となってい
る。ここで、バブル発生コイル６ｃに電流を流すと、こ
の部分に磁気バブル６ｅが発生する。この状態において
回転軸１が回転し、図１２のｆに示すように、回転永久
磁石４のＮ１極が磁気バブル素子５と対向してから、さ
らに４５度回転して同図ｇの位置になると、漏洩磁束は
それぞれ矢印で示すようになって磁気バブル素子５と鎖
交する。回転永久磁石４は４極なので、回転軸１の１回
転の間に、この漏洩磁束の鎖交により磁気バブル素子５
に印加される磁界の強さは図１３のように楕円形状に変
化し、これが２回繰り返される。ここで、図１２ｆの状
態は楕円の短軸方向、ｇの状態は長軸方向に相当する。
この楕円磁界により転送パターン６ｂが磁化され、磁気
バブル６ｅを吸引移動して楕円磁界の１回転につき磁気
バブル６ｅは１パターン転送される。従って、この場合
、回転軸１が１回転する間に磁気バブル６ｅは２パター
ン転送されることになる。即ち、回転永久磁石４は回転
軸１の回転により磁気バブル６ｅの駆動磁界を発生する
磁石である。In the multi-rotation absolute value detector configured as described above, the magnetization direction of the magnetic bubble chip 6 is kept constant by the unidirectional magnetic field generated by the bias permanent magnets 9 and 10. Here, when a current is passed through the bubble generating coil 6c, a magnetic bubble 6e is generated in this portion. In this state, the rotating shaft 1 rotates, and after the N1 pole of the rotating permanent magnet 4 faces the magnetic bubble element 5 as shown in f of FIG. , the leakage magnetic flux interlinks with the magnetic bubble element 5 as shown by the arrows. Since the rotating permanent magnet 4 has four poles, during one rotation of the rotating shaft 1, the magnetic bubble element 5 is
The strength of the magnetic field applied to the magnetic field changes in an elliptical shape as shown in FIG. 13, and this is repeated twice. Here, the state in FIG. 12f corresponds to the short axis direction of the ellipse, and the state in g corresponds to the long axis direction. The transfer pattern 6b is magnetized by this elliptical magnetic field, attracts and moves the magnetic bubbles 6e, and one pattern of the magnetic bubbles 6e is transferred per rotation of the elliptical magnetic field. Therefore, in this case, two patterns of magnetic bubbles 6e are transferred during one rotation of the rotating shaft 1. That is, the rotating permanent magnet 4 is a magnet that generates a driving magnetic field for the magnetic bubble 6e by the rotation of the rotating shaft 1.
【０００８】回転軸１の回転数を磁気バブル６ｅの転送
位置から検出するには、Ｘコイル７、Ｙコイル８に正弦
、余弦に変化する電流を流して回転磁界を発生させ、転
送パターン６ｂを磁化させて磁気バブル６ｅを戻す。
これがバブル検出器６ｄの位置まで戻ったときに生ずる
バブル検出器６ｄの出力電圧の変化を検出し、制御回路
（図示せず）により回転量が検出される。なお、磁気遮
蔽カバー１２，１３は外来磁気遮蔽のためのカバーとし
て、磁気バブル６ｅの正常な転送を保持するものである
。In order to detect the rotational speed of the rotating shaft 1 from the transfer position of the magnetic bubble 6e, a rotating magnetic field is generated by passing currents varying in sine and cosine through the X coil 7 and Y coil 8, and the transfer pattern 6b is detected. Magnetize and return the magnetic bubble 6e. When this returns to the position of the bubble detector 6d, a change in the output voltage of the bubble detector 6d is detected, and the amount of rotation is detected by a control circuit (not shown). Note that the magnetic shielding covers 12 and 13 serve as covers for shielding from external magnetic fields and maintain normal transfer of the magnetic bubbles 6e.
【０００９】[0009]
【発明が解決しようとする課題】従来の回転数検出器は
以上のように構成され、回転永久磁石の漏洩磁束による
楕円磁界を磁気バブル素子に印加しているため、転送パ
ターンの磁化が一定とならず、磁気バブルの転送の信頼
性が低い。また、回転永久磁石の漏洩磁束を受入れるた
めの磁気的な開口部が必要なため確実な磁気遮蔽が困難
で、磁気バブル素子には回転永久磁石による転送方向と
垂直な有害磁束や、回転軸等から侵入する外来磁束が鎖
交し、磁気バブルの安定保持や転送の信頼性が低い。。
さらに、磁気バブル素子にＸコイル、Ｙコイルが捲回さ
れているので、永久磁石と磁気バブル素子の距離が大き
くなり有効な磁界を大きくできず、製品化が困難であっ
た。[Problem to be Solved by the Invention] The conventional rotation speed detector is constructed as described above and applies an elliptical magnetic field due to the leakage magnetic flux of the rotating permanent magnet to the magnetic bubble element, so that the magnetization of the transfer pattern is constant. Therefore, the reliability of magnetic bubble transfer is low. In addition, reliable magnetic shielding is difficult because a magnetic opening is required to accept the leakage magnetic flux of the rotating permanent magnet, and the magnetic bubble element does not allow harmful magnetic flux perpendicular to the direction of transfer by the rotating permanent magnet, or the rotating shaft, etc. External magnetic flux entering from the magnetic bubbles is interlinked, making stable retention and transfer of magnetic bubbles unreliable. . Furthermore, since the X coil and Y coil are wound around the magnetic bubble element, the distance between the permanent magnet and the magnetic bubble element becomes large, making it impossible to increase the effective magnetic field, making it difficult to commercialize the device.
【００１０】この発明は上記のような課題を解決するた
めになされたもので、磁気バブル素子に円磁界を印加し
て転送パターンの磁化を一定とし、磁気バブルの転送の
信頼性を向上し、有害磁気遮蔽を確実に行なうとともに
有効磁界を大きくして、磁気バブルの安定保持と転送信
頼性とを高めた回転数検出器を得ることを目的とする。The present invention was made to solve the above-mentioned problems, and it improves the reliability of magnetic bubble transfer by applying a circular magnetic field to a magnetic bubble element to keep the magnetization of a transfer pattern constant. The object of the present invention is to obtain a rotation speed detector that securely shields harmful magnetic fields and increases the effective magnetic field, thereby stably holding magnetic bubbles and improving transmission reliability.
【００１１】[0011]
【課題を解決するための手段】この発明の第１発明に係
る回転数検出器は、磁気バブルを順次転送する転送パタ
ーンを有する磁気バブルチップ及び磁気バブルチップに
捲回され磁気バブルを駆動する回転磁界を発生する駆動
コイルを有する磁気バブル素子と、磁気バブルチップに
印加するバイアス磁界を発生するバイアス磁界用磁石と
、Ｓ極Ｎ極が少なくとも一対着磁されて回転体の回転軸
に固定され、回転軸の回転により磁気バブルの駆動磁界
を発生する回転永久磁石と、転送パターン上の磁気バブ
ルの位置に基づき回転軸の回転数を検出する検出手段と
を備えたものにおいて、それぞれの一端が磁気バブルチ
ップと同一平面上で、かつ、その周囲に対向して配置さ
れ、それぞれの他端が回転永久磁石と対向して配置され
て、回転永久磁石と磁気バブルチップとを結ぶ磁気回路
が形成され、この磁気回路を介して回転永久磁石が発生
した駆動磁界が磁気バブルに与えられる複数のヨークを
設けたものである。[Means for Solving the Problems] A rotation speed detector according to a first aspect of the present invention includes a magnetic bubble chip having a transfer pattern for sequentially transferring magnetic bubbles, and a rotation speed sensor wound around the magnetic bubble chip to drive the magnetic bubbles. A magnetic bubble element having a drive coil that generates a magnetic field, a bias magnetic field magnet that generates a bias magnetic field to be applied to the magnetic bubble chip, and at least one pair of south and north poles are magnetized and fixed to the rotating shaft of a rotating body, A rotating permanent magnet that generates a driving magnetic field for a magnetic bubble by rotation of a rotating shaft, and a detection means that detects the rotational speed of the rotating shaft based on the position of the magnetic bubble on the transfer pattern, one end of each of which is magnetically The magnetic bubble chip is disposed on the same plane as the bubble chip and facing around its periphery, and the other end of each is disposed facing the rotating permanent magnet to form a magnetic circuit connecting the rotating permanent magnet and the magnetic bubble chip. , a plurality of yokes are provided in which the driving magnetic field generated by the rotating permanent magnet is applied to the magnetic bubble via this magnetic circuit.
【００１２】この発明の第２発明に係る回転数検出器は
、磁気バブルを順次転送する転送パターンを有する磁気
バブルチップからなる磁気バブル素子及び磁気バブルチ
ップに印加するバイアス磁界を発生するバイアス磁界用
磁石と、Ｓ極Ｎ極が少なくとも一対着磁されて回転体の
回転軸に固定され、回転軸の回転により磁気バブルの駆
動磁界を発生する回転永久磁石と、転送パターン上の磁
気バブルの位置に基づき回転軸の回転数を検出する検出
手段とを備えたものにおいて、それぞれの一端が磁気バ
ブルチップと同一平面上で、かつ、その周囲に対向して
配置され、それぞれの他端が回転永久磁石と対向して配
置されて、回転永久磁石と磁気バブルチップとを結ぶ磁
気回路が形成され、この磁気回路を介して回転永久磁石
が発生した駆動磁界が磁気バブルに与えられる複数のヨ
ークと、この複数のヨークに設けられ、転送パターン上
の磁気バブルを駆動するための回転磁界を発生する磁気
バブル駆動用コイルとを設けたものである。A rotation speed detector according to a second aspect of the present invention includes a magnetic bubble element comprising a magnetic bubble chip having a transfer pattern for sequentially transferring magnetic bubbles, and a bias magnetic field for generating a bias magnetic field to be applied to the magnetic bubble chip. A magnet, a rotating permanent magnet having at least one pair of S and N poles magnetized and fixed to the rotating shaft of a rotating body, which generates a driving magnetic field for the magnetic bubble by rotation of the rotating shaft, and a rotating permanent magnet that is positioned at the position of the magnetic bubble on the transfer pattern. one end of each is arranged on the same plane as the magnetic bubble chip and facing around its periphery, and the other end of each is arranged with a rotating permanent magnet. A plurality of yokes are disposed facing each other to form a magnetic circuit connecting the rotating permanent magnet and the magnetic bubble chip, and a driving magnetic field generated by the rotating permanent magnet is applied to the magnetic bubble via this magnetic circuit. A magnetic bubble driving coil is provided on a plurality of yokes and generates a rotating magnetic field for driving magnetic bubbles on a transfer pattern.
【００１３】この発明の第３発明に係る回転数検出器は
、第１発明又は第２発明において、回転永久磁石をその
外周に円周方向に沿って交互に磁極を設けた磁石とした
ものである。[0013] A rotation speed detector according to a third aspect of the present invention is such that, in the first or second aspect, the rotating permanent magnet is a magnet in which magnetic poles are alternately provided along the circumferential direction on the outer periphery of the rotating permanent magnet. be.
【００１４】この発明の第４発明に係る回転数検出器は
、第１発明又は第２発明において、回転永久磁石を軸方
向に磁極を設けた磁石としたものである。[0014] A rotational speed detector according to a fourth aspect of the present invention is the rotational speed detector according to the first or second aspect, in which the rotating permanent magnet is a magnet having magnetic poles in the axial direction.
【００１５】この発明の第５発明に係る回転数検出器は
、第１発明、第２発明、第３発明又は第４発明において
、磁気バブル素子、バイアス磁界用磁石及び複数のヨー
クを樹脂で一体に成形したものである。[0015] The rotation speed detector according to the fifth invention of the present invention is the rotation speed detector according to the first invention, the second invention, the third invention, or the fourth invention, in which the magnetic bubble element, the bias magnetic field magnet, and the plurality of yokes are integrated with resin. It is molded into.
【００１６】この発明の第６発明に係る回転数検出器は
、第５発明において、樹脂モールド部を複数のヨークの
他端を除いて覆う磁気遮蔽カバーを設けたものである。A rotation speed detector according to a sixth aspect of the present invention is the rotation speed detector according to the fifth aspect, in which a magnetic shielding cover is provided that covers the resin molded portion except for the other ends of the plurality of yokes.
【００１７】[0017]
【作用】この発明の第１発明においては、回転永久磁石
と磁気バブルチップとの間にヨークを設けたので、回転
永久磁石の磁束が漏洩することなくヨークを通過し、磁
気バブルチップに効率よく印加され、転送パターンの磁
化を一定として信頼性を高める。[Operation] In the first aspect of the present invention, since the yoke is provided between the rotating permanent magnet and the magnetic bubble chip, the magnetic flux of the rotating permanent magnet passes through the yoke without leaking, and is efficiently attached to the magnetic bubble chip. The magnetization is applied to keep the magnetization of the transfer pattern constant and improve reliability.
【００１８】この発明の第２発明においては、回転永久
磁石と磁気バブルチップとの間に磁気バブルを駆動する
駆動コイルを持ったヨークを設けたので、磁気バブルチ
ップ側に駆動コイルが不要となり、磁気バブル素子を小
形化でき、回転永久磁石の磁束が漏洩することなくヨー
クを通過し、磁気バブルチップに効率よく印加され、転
送パターンの磁化を一定として信頼性を高める。[0018] In the second aspect of the present invention, since a yoke having a drive coil for driving the magnetic bubble is provided between the rotating permanent magnet and the magnetic bubble chip, there is no need for a drive coil on the magnetic bubble chip side. The magnetic bubble element can be miniaturized, the magnetic flux of the rotating permanent magnet passes through the yoke without leaking, is efficiently applied to the magnetic bubble chip, and the magnetization of the transfer pattern is kept constant to improve reliability.
【００１９】この発明の第３発明においては、回転永久
磁石の外周に円周方向に沿って磁極を設けたから、軸方
向の寸法を小さくできる。In the third aspect of the present invention, since the magnetic poles are provided along the circumferential direction on the outer periphery of the rotating permanent magnet, the axial dimension can be reduced.
【００２０】この発明の第４発明においては、回転永久
磁石の軸方向に磁極を設けたから、外径寸法を小さくで
きる。In the fourth aspect of the present invention, since the magnetic poles are provided in the axial direction of the rotating permanent magnet, the outer diameter size can be reduced.
【００２１】この発明の第５発明においては、磁気バブ
ル素子、バイアス磁界用磁石及び複数のヨークを樹脂で
一体成形してから、組立性が向上し、信頼性を高める。[0021] In the fifth aspect of the present invention, the magnetic bubble element, the bias magnetic field magnet, and the plurality of yokes are integrally molded from resin, thereby improving assembly efficiency and reliability.
【００２２】この発明の第６発明においては、樹脂モー
ルド部を磁気遮蔽カバーで覆ったので、外部からの有害
磁気を遮蔽し、磁気バブルの動作の信頼性が向上する。In the sixth aspect of the present invention, since the resin molded portion is covered with a magnetic shielding cover, harmful magnetism from the outside is shielded, and the reliability of the operation of the magnetic bubble is improved.
【００２３】[0023]
【実施例】図１はこの発明の第１実施例による多回転絶
対値検出器を示す要部断面図であり、図２はその回転永
久磁石と磁気バブル素子の配置関係を説明する説明図で
ある。Embodiment FIG. 1 is a cross-sectional view of a main part of a multi-rotation absolute value detector according to a first embodiment of the present invention, and FIG. 2 is an explanatory diagram illustrating the arrangement relationship between a rotating permanent magnet and a magnetic bubble element. be.
【００２４】なお、図中、従来例を示す図８、図９と同
一符号の部分はこれと同じなので説明を省略する。ここ
で、１５〜１８はヨークで、それぞれ一端１５ａ〜１８
ａは磁気バブルチップ６と同一平面上で、かつ、その四
隅に対向配置され、他端１５ｂ〜１８ｂは回転永久磁石
４の外周に対向して４５度の間隔で配置されている。２
０は樹脂モールド部で、磁気バブル素子５、バイアス永
久磁石９，１０及びヨーク１５〜１８を一体としてモー
ルド成形したものである。１９は磁気遮蔽カバーであり
、ヨークの一端１５ｂ〜１８ｂのみに開口部１９ａを有
している。この磁気遮蔽カバー１９で樹脂モールド部を
覆えば、有害磁気が確実に遮蔽される。磁気遮蔽カバー
１９を設ける場合は、上記の５，９，１０，１５〜１８
に磁気遮蔽カバーも加えて一緒にモールド成形してもよ
い。[0024] In the figure, the parts having the same reference numerals as those in FIGS. 8 and 9 showing the conventional example are the same, so the explanation will be omitted. Here, 15 to 18 are yokes, each having one end 15a to 18.
a is arranged on the same plane as the magnetic bubble chip 6 and facing its four corners, and the other ends 15b to 18b are arranged facing the outer periphery of the rotating permanent magnet 4 at intervals of 45 degrees. 2
Reference numeral 0 designates a resin molded portion in which the magnetic bubble element 5, bias permanent magnets 9 and 10, and yokes 15 to 18 are integrally molded. A magnetic shielding cover 19 has an opening 19a only at one end of the yoke 15b to 18b. By covering the resin molded portion with this magnetic shielding cover 19, harmful magnetism can be reliably shielded. When providing the magnetic shielding cover 19, the above 5, 9, 10, 15 to 18
A magnetic shielding cover may also be added and molded together.
【００２５】上記のように構成した回転数検出器におい
て、図３に示すように、回転永久磁石４が回転して、ａ
のように磁極Ｎ１とヨーク１５の他端１５ｂとが対向す
ると、ヨーク１７の他端１７ｂは磁極Ｓ１と対向する。
ここで、ヨーク１５の他端１５ｂはＳ極、ヨーク１７の
他端１７ｂはＮ極、ヨーク１５の一端１５ａはＮ極、ヨ
ーク１７の一端１７ａはＳ極に磁化され、回転永久磁石
４、ヨーク１５、磁気バブルチップ６、ヨーク１７の磁
気回路が形成される。このとき、他のヨーク１６，１８
は磁化されない。In the rotation speed detector constructed as described above, as shown in FIG. 3, the rotating permanent magnet 4 rotates and a
When the magnetic pole N1 and the other end 15b of the yoke 15 face each other, the other end 17b of the yoke 17 faces the magnetic pole S1. Here, the other end 15b of the yoke 15 is magnetized to the S pole, the other end 17b of the yoke 17 is magnetized to the N pole, the one end 15a of the yoke 15 is magnetized to the N pole, and the one end 17a of the yoke 17 is magnetized to the S pole. 15, a magnetic bubble chip 6, and a magnetic circuit of a yoke 17 are formed. At this time, the other yokes 16 and 18
is not magnetized.
【００２６】次いで、回転永久磁石４が４５度回転して
ｂの位置となるとヨーク１６，１８が磁化され、ヨーク
１６の他端１６ｂはＳ極、一端１６ａがＮ極、ヨーク１
８の他端１８ｂがＮ極、一端１８ａがＳ極に磁化され、
ヨーク１５，１８は磁化されない。従って磁気バブルチ
ップ６にはａの状態に対して磁束の向きは９０度ずれる
。以下同様に作用し、ｃの状態で１８０度、ｄの状態で
２７０度、ｅの状態で３６０度となり、元の状態に復帰
する。このとき、回転永久磁石４は１／２回転している
。従って、回転永久磁石４が１回転すると、磁気バブル
６ｅは転送パターン６ｂ上を２パターン移動する。Next, when the rotating permanent magnet 4 rotates 45 degrees to position b, the yokes 16 and 18 are magnetized, and the other end 16b of the yoke 16 is the S pole, the one end 16a is the N pole, and the yoke 1
The other end 18b of 8 is magnetized as a N pole, and the one end 18a is magnetized as an S pole,
Yokes 15, 18 are not magnetized. Therefore, the direction of the magnetic flux in the magnetic bubble chip 6 is shifted by 90 degrees from the state a. Thereafter, the same effect occurs, and the state becomes 180 degrees in the state c, 270 degrees in the state d, and 360 degrees in the state e, returning to the original state. At this time, the rotating permanent magnet 4 is rotating 1/2 rotation. Therefore, when the rotating permanent magnet 4 rotates once, the magnetic bubble 6e moves on the transfer pattern 6b in two patterns.
【００２７】以上の説明からわかるように、この第１実
施例は回転永久磁石４と磁気バブルチップ６とを結ぶ磁
気回路を成形するヨーク１５〜１８を設けたので、回転
永久磁石４の磁束をヨークを通して磁気バブルチップ６
に円磁界として印加することができ、転送パターンの磁
化を一定にして、バブル転送の信頼性を向上させること
ができる。As can be seen from the above explanation, this first embodiment is provided with yokes 15 to 18 that form a magnetic circuit connecting the rotating permanent magnet 4 and the magnetic bubble chip 6, so that the magnetic flux of the rotating permanent magnet 4 is reduced. Magnetic bubble chip 6 through the yoke
It is possible to apply a circular magnetic field to the bubble transfer, making it possible to keep the magnetization of the transfer pattern constant and improve the reliability of bubble transfer.
【００２８】さらに、磁気バブル素子、バイアス磁界用
磁石及びヨークを樹脂で一体にモールド成形して相互位
置関係のバラツキを減少させたので、これらの組立を不
要とし、取扱いが容易になる。また、ヨークの他端を除
き、樹脂モールド部を磁気遮蔽カバーで覆うことにより
、磁気バブル素子に対する有害磁気を確実に遮蔽したの
で、磁気バブルの安定保持と転送信頼性の向上が得られ
る。Furthermore, since the magnetic bubble element, the bias magnetic field magnet, and the yoke are integrally molded with resin to reduce variations in mutual positional relationship, there is no need to assemble them, making handling easier. In addition, by covering the resin molded part with a magnetic shielding cover except for the other end of the yoke, harmful magnetism to the magnetic bubble element is reliably shielded, so that stable retention of the magnetic bubble and improvement in transfer reliability can be achieved.
【００２９】図４はこの発明の第２実施例を示す要部断
面図で、回転永久磁石４の磁極を軸方向に設け、ヨーク
１５〜１８の他端１５ｂ〜１８ｂを回転永久磁石４の側
面に対向配置したものであるが、その作用効果は図１，
図２で示した第１実施例と同じである。この第２実施例
によれば、軸直角方向に寸法的余裕が得られるので、軸
方向の寸法が増加しても、外径寸法が制限される用途に
適用することができる。なお、この第２実施例では、回
転永久磁石４は、図２と同じ側から見たとき、Ｎ極の裏
がＳ極、Ｓ極の裏がＮ極となるように着磁されている。
第１実施例ではＮ極の裏もＮ極、Ｓ極の裏もＳ極となる
ように着磁されている。FIG. 4 is a sectional view of a main part showing a second embodiment of the present invention, in which the magnetic poles of the rotating permanent magnet 4 are provided in the axial direction, and the other ends 15b to 18b of the yokes 15 to 18 are connected to the side surface of the rotating permanent magnet 4. The functions and effects are shown in Figure 1.
This is the same as the first embodiment shown in FIG. According to the second embodiment, a dimensional margin can be obtained in the direction perpendicular to the axis, so that even if the dimension in the axial direction increases, it can be applied to applications where the outer diameter dimension is limited. In this second embodiment, the rotating permanent magnet 4 is magnetized so that the back side of the N pole becomes the S pole, and the back side of the S pole becomes the N pole, when viewed from the same side as in FIG. In the first embodiment, the magnets are magnetized so that the back side of the north pole becomes the north pole, and the back side of the south pole becomes the south pole.
【００３０】次に、図５はこの発明の第３実施例を示す
要部断面図、図６はその回転永久磁石と磁気バブル素子
の配置関係を説明する説明図である。図５及び図６にお
いて、図１及び図２と同一符号の部分は同一部分を示す
ので、説明を省略する。ここで、１５〜１８はコイル２
１〜２４を持つヨークで、それぞれ一端１５ａ〜１８ａ
は磁気バブルチップ６と同一平面上で、かつ、その四隅
に対向配置され、他端１５ｂ〜１８ｂは回転永久磁石４
の外周に対向して４５度の間隔で配置されている。Next, FIG. 5 is a sectional view of a main part showing a third embodiment of the present invention, and FIG. 6 is an explanatory diagram illustrating the arrangement relationship between a rotating permanent magnet and a magnetic bubble element. In FIGS. 5 and 6, parts with the same reference numerals as those in FIGS. 1 and 2 indicate the same parts, and therefore the description thereof will be omitted. Here, 15 to 18 are coil 2
Yoke with 1 to 24, each with one end 15a to 18a
are placed on the same plane as the magnetic bubble chip 6 and facing each other at its four corners, and the other ends 15b to 18b are connected to the rotating permanent magnets 4.
They are arranged at 45 degree intervals facing the outer periphery of the.
【００３１】上記のように構成した回転数検出器におい
て、回転永久磁石４が１回転すると、磁気バブル６ｅが
転送パターン６ｂ上を２パターン移動する動作は、第１
実施例と同じである。In the rotation speed detector configured as described above, when the rotating permanent magnet 4 rotates once, the magnetic bubble 6e moves in two patterns on the transfer pattern 6b.
It is the same as the example.
【００３２】回転軸１の回転数を磁気バブル６ｅの転送
位置から検出するには、永久磁石４の停止位置を１回転
内絶対値エンコーダ２で検出し、回転永久磁石４による
磁界と、コイル２１〜２４で作られる磁界の合成成分が
円形の回転磁界になるように、コイル駆動回路（図示せ
ず）によりコイル２１〜２４に正弦、余弦に変化する電
流を流して、転送パターン６ｂを磁化させて磁気バブル
６ｅを戻す。これがバブル検出器６ｄの位置まで戻った
時に生ずるバブル磁気バブル検出器６ｄの出力電圧の変
化を検出し、制御回路（図示せず）により回転量が検出
される。In order to detect the rotation speed of the rotating shaft 1 from the transfer position of the magnetic bubble 6e, the stop position of the permanent magnet 4 is detected by the one-rotation absolute value encoder 2, and the magnetic field by the rotating permanent magnet 4 and the coil 21 are detected. The transfer pattern 6b is magnetized by passing a current varying in sine and cosine through the coils 21 to 24 by a coil drive circuit (not shown) so that the composite component of the magnetic field created by the coils 21 to 24 becomes a circular rotating magnetic field. to return the magnetic bubble 6e. When the bubble returns to the position of the bubble detector 6d, a change in the output voltage of the bubble magnetic bubble detector 6d is detected, and the amount of rotation is detected by a control circuit (not shown).
【００３３】図７は、この発明の第４実施例を示す要部
断面図で、回転永久磁石４の磁極を軸方向に設け、ヨー
ク１５〜１８の他端１５ｂ〜１８ｂを回転永久磁石４の
側面に対向配置したものであるが、その作用効果は第１
〜第３実施例と同じである。FIG. 7 is a sectional view of a main part showing a fourth embodiment of the present invention, in which the magnetic poles of the rotating permanent magnet 4 are provided in the axial direction, and the other ends 15b to 18b of the yokes 15 to 18 are connected to the rotating permanent magnet 4. Although they are placed facing each other on the sides, their effects are the first.
- Same as the third embodiment.
【００３４】なお、上記実施例では、１回転内の絶対値
検出器を１回転内絶対値エンコーダによって行った場合
を示したが、これはレゾルバや誘導子レゾルバ等を用い
てもよく、さらに、１回転内絶対値検出器を用いずに回
転回数のみを検出する構成にしても、上記実施例と同様
の効果を奏する。In the above embodiment, the absolute value within one rotation is detected using an absolute value encoder within one rotation, but a resolver, an inductor resolver, etc. may also be used. Even if the configuration is such that only the number of rotations is detected without using the intra-rotation absolute value detector, the same effects as in the above embodiment can be obtained.
【００３５】[0035]
【発明の効果】この発明の第１発明は以上説明したとお
り、回転体の回転軸に固定され回転軸の回転により磁気
バブルの駆動磁界を発生する回転永久磁石と磁気バブル
チップとの間に磁気回路を形成する複数のヨークを設け
たので、回転永久磁石の磁束をヨークを通して磁気バブ
ルチップに円磁界として印加することができ、転送パタ
ーンの磁化を一定にして、バブル転送の信頼性を向上さ
せることができる。Effects of the Invention As explained above, the first aspect of the present invention is to create a magnetic bubble between the rotating permanent magnet, which is fixed to the rotating shaft of a rotating body and generates a driving magnetic field for magnetic bubbles by the rotation of the rotating shaft, and the magnetic bubble chip. With multiple yokes forming the circuit, the magnetic flux of the rotating permanent magnet can be applied as a circular magnetic field to the magnetic bubble chip through the yokes, making the magnetization of the transfer pattern constant and improving the reliability of bubble transfer. be able to.
【００３６】この発明の第２発明は以上説明したとおり
、回転体の回転軸に固定され回転軸の回転により磁気バ
ブルの駆動磁界を発生する回転永久磁石と磁気バブルチ
ップとの間に磁気回路を形成する複数のヨークを設け、
さらにヨークに転送パターン上の磁気バブルを駆動する
ための回転磁界を発生する磁気バブル駆動用コイルを設
けたので、回転永久磁石の磁束をヨークを通して磁気バ
ブル素子に円磁界として印加することができ、また、磁
気バブルチップに駆動コイルを捲回する必要がなく、磁
気バブル素子を小型化でき、ヨークと磁気バブルチップ
のギャップを小さくできるため印加磁界を強くすること
ができ、結果として、バブル転送の信頼性を向上させる
ことができる。As explained above, the second aspect of the present invention provides a magnetic circuit between a rotating permanent magnet that is fixed to the rotating shaft of a rotating body and generates a driving magnetic field for magnetic bubbles by rotation of the rotating shaft, and a magnetic bubble chip. A plurality of yokes are provided to form the
Furthermore, since the yoke is equipped with a magnetic bubble drive coil that generates a rotating magnetic field to drive the magnetic bubbles on the transfer pattern, the magnetic flux of the rotating permanent magnet can be applied as a circular magnetic field to the magnetic bubble element through the yoke. In addition, there is no need to wind a drive coil around the magnetic bubble chip, making it possible to downsize the magnetic bubble element and making the gap between the yoke and the magnetic bubble chip smaller, making it possible to strengthen the applied magnetic field. Reliability can be improved.
【００３７】この発明の第３発明は以上説明したとおり
、永久磁石の外周に円周方向に沿って磁極を設けたから
、第１発明又は第２発明の効果に加えて、外径寸法が増
加しても、軸方向の寸法が制限される用途に適用するこ
とができる効果がある。As explained above, in the third aspect of the present invention, since magnetic poles are provided along the circumferential direction on the outer periphery of the permanent magnet, in addition to the effects of the first or second invention, the outer diameter dimension is increased. However, it has the advantage that it can be applied to applications where the axial dimension is limited.
【００３８】この発明の第４発明は以上説明したとおり
、永久磁石の軸方向に磁極を設けたから、第１発明又は
第２発明の効果に加えて、軸方向の寸法が増加しても、
外径寸法が制限される用途に適用することができる効果
がある。As explained above, in the fourth aspect of the present invention, since the magnetic poles are provided in the axial direction of the permanent magnet, in addition to the effects of the first or second invention, even if the axial dimension increases,
This has the advantage that it can be applied to applications where the outer diameter is limited.
【００３９】この発明の第５発明は以上説明したとおり
、第１発明、第２発明、第３発明又は第４発明の効果に
加えて、磁気バブル素子、バイアス磁界用磁石及び複数
のヨークを樹脂で一体に成形したから、相互位置関係の
バラツキが減少し、これらを組立てる作業が不要となり
、取扱いが容易になる効果がある。As explained above, the fifth invention of the present invention, in addition to the effects of the first invention, second invention, third invention, or fourth invention, comprises a magnetic bubble element, a bias magnetic field magnet, and a plurality of yokes made of resin. Since they are integrally molded, variations in mutual positional relationship are reduced, there is no need to assemble them, and handling becomes easier.
【００４０】この発明の第６発明は以上説明したとおり
、樹脂モード部を磁気遮蔽カバーで覆ったから、第５発
明の効果に加えて、磁気バブル素子に対する有害磁気を
確実に遮蔽することができ、磁気バブルの安定保持と転
送信頼性の向上が得られる効果がある。As explained above, the sixth aspect of the present invention covers the resin mode section with a magnetic shielding cover, so in addition to the effects of the fifth aspect, it is possible to reliably shield the magnetic bubble element from harmful magnetism. This has the effect of stably holding magnetic bubbles and improving transfer reliability.
【図１】この発明の第１実施例を示す要部断面図である
。FIG. 1 is a sectional view of a main part showing a first embodiment of the present invention.
【図２】この発明の第１実施例の回転永久磁石と磁気バ
ブル素子の配置関係を説明する説明図である。FIG. 2 is an explanatory diagram illustrating the arrangement relationship between a rotating permanent magnet and a magnetic bubble element in the first embodiment of the present invention.
【図３】この発明の第１実施例における磁気バブル素子
方向と回転永久磁石の磁極との関係を示す説明図である
。FIG. 3 is an explanatory diagram showing the relationship between the direction of a magnetic bubble element and the magnetic poles of a rotating permanent magnet in the first embodiment of the present invention.
【図４】この発明の第２実施例を示す要部断面図である
。FIG. 4 is a sectional view of a main part showing a second embodiment of the invention.
【図５】この発明の第３実施例を示す要部断面図である
。FIG. 5 is a sectional view of a main part showing a third embodiment of the present invention.
【図６】この発明の第３実施例の回転永久磁石と磁気バ
ブル素子の配置関係を説明する説明図である。FIG. 6 is an explanatory diagram illustrating the arrangement relationship between a rotating permanent magnet and a magnetic bubble element according to a third embodiment of the present invention.
【図７】この発明の第４実施例を示す要部断面図である
。FIG. 7 is a sectional view of a main part showing a fourth embodiment of the invention.
【図８】従来の回転数検出器を用いた多回転絶対値検出
器の要部断面図である。FIG. 8 is a sectional view of a main part of a multi-rotation absolute value detector using a conventional rotation speed detector.
【図９】図８のＡ−Ａ線断面図である。9 is a cross-sectional view taken along the line AA in FIG. 8. FIG.
【図１０】Ｘコイル及びＹコイルの外観図である。FIG. 10 is an external view of an X coil and a Y coil.
【図１１】磁気バブルチップの平面図である。FIG. 11 is a plan view of a magnetic bubble chip.
【図１２】従来の回転永久磁石の漏洩磁束と磁気バブル
素子の位置関係を示す説明図である。FIG. 12 is an explanatory diagram showing the positional relationship between leakage magnetic flux of a conventional rotating permanent magnet and a magnetic bubble element.
【図１３】従来の磁気バブル素子に印加される磁界の強
さを示す説明図である。FIG. 13 is an explanatory diagram showing the strength of a magnetic field applied to a conventional magnetic bubble element.
１ 回転軸
２ １回転内絶対値エンコーダ
４ 回転永久磁石
５ 磁気バブル素子
６ 磁気バブルチップ
７ Ｘコイル（駆動コイル）
８ Ｙコイル（駆動コイル）
９，１０ バイアス永久磁石
１５，１６，１７，１８ ヨーク２０ 樹
脂モールド部1 Rotating shaft 2 Absolute value encoder within one rotation 4 Rotating permanent magnet 5 Magnetic bubble element 6 Magnetic bubble chip 7 X coil (driving coil) 8 Y coil (driving coil) 9, 10 Bias permanent magnet 15, 16, 17, 18 Yoke 20 Resin mold part
Claims (6)
ンを有する磁気バブルチップ及び前記磁気バブルチップ
に捲回され磁気バブルを駆動する回転磁界を発生する駆
動コイルを有する磁気バブル素子と、前記磁気バブルチ
ップに印加するバイアス磁界を発生するバイアス磁界用
磁石と、Ｓ極Ｎ極が少なくとも一対着磁されて回転体の
回転軸に固定され、前記回転軸の回転により前記磁気バ
ブルの駆動磁界を発生する回転永久磁石と、前記転送パ
ターン上の磁気バブルの位置に基づき前記回転軸の回転
数を検出する検出手段と、それぞれの一端が前記磁気バ
ブルチップと同一平面上で、かつ、その周囲に対向して
配置され、それぞれの他端が前記回転永久磁石と対向し
て配置されて、前記回転永久磁石と前記磁気バブルチッ
プとを結ぶ磁気回路が形成され、この磁気回路を介して
前記回転永久磁石が発生した駆動磁界が前記磁気バブル
に与えられ複数のヨークとを備えた回転数検出器。1. A magnetic bubble chip having a transfer pattern for sequentially transferring magnetic bubbles, a magnetic bubble element having a drive coil wound around the magnetic bubble chip and generating a rotating magnetic field for driving the magnetic bubbles, and the magnetic bubble chip. A bias magnetic field magnet that generates a bias magnetic field to be applied to the magnetic bubble, and at least one pair of S and N poles are magnetized and fixed to a rotating shaft of a rotating body, and rotation that generates a driving magnetic field for the magnetic bubble by rotation of the rotating shaft. a permanent magnet; a detection means for detecting the rotational speed of the rotation shaft based on the position of the magnetic bubble on the transfer pattern; and the other end of each is arranged to face the rotating permanent magnet to form a magnetic circuit connecting the rotating permanent magnet and the magnetic bubble chip, and the rotating permanent magnet is generated through this magnetic circuit. A rotation speed detector comprising a plurality of yokes in which a driving magnetic field is applied to the magnetic bubble.
ンを有する磁気バブルチップからなる磁気バブル素子及
び前記磁気バブルチップに印加するバイアス磁界を発生
するバイアス磁界用磁石を有する磁気バブル素子と、Ｓ
極Ｎ極が少なくとも一対着磁されて回転体の回転軸に固
定され、前記回転軸の回転により前記磁気バブルの駆動
磁界を発生する回転永久磁石と、前記転送パターン上の
磁気バブルの位置に基づき前記回転軸の回転数を検出す
る検出手段と、それぞれの一端が前記磁気バブルチップ
と同一平面上で、かつ、その周囲に対向して配置され、
それぞれの他端が前記回転永久磁石と対向して配置され
て、前記回転永久磁石と前記磁気バブルチップとを結ぶ
磁気回路が形成され、この磁気回路を介して前記回転永
久磁石が発生した駆動磁界が前記磁気バブルに与えられ
複数のヨークと、この複数のヨークに設けられ、転送パ
ターン上の磁気バブルを駆動するための回転磁界を発生
する磁気バブル駆動用コイルとを備えた回転数検出器。2. A magnetic bubble element comprising a magnetic bubble chip having a transfer pattern for sequentially transferring magnetic bubbles and a bias magnetic field magnet for generating a bias magnetic field to be applied to the magnetic bubble chip;
a rotating permanent magnet having at least one pair of north and north poles magnetized and fixed to a rotating shaft of a rotating body, and generating a driving magnetic field for the magnetic bubble by rotation of the rotating shaft; a detecting means for detecting the rotational speed of the rotating shaft, one end of each of which is disposed on the same plane as the magnetic bubble chip and facing the periphery thereof;
The other end of each is disposed to face the rotating permanent magnet to form a magnetic circuit connecting the rotating permanent magnet and the magnetic bubble chip, and the driving magnetic field generated by the rotating permanent magnet is transmitted through this magnetic circuit. A rotation speed detector comprising: a plurality of yokes, each of which is applied to the magnetic bubble, and a magnetic bubble driving coil, which is provided on the plurality of yokes and generates a rotating magnetic field for driving the magnetic bubble on the transfer pattern.
に沿って交互に磁極を設けたことを特徴とした請求項１
又は２記載の回転数検出器。[Claim 3] Claim 1, wherein the rotating permanent magnet is provided with magnetic poles alternately along the circumferential direction on its outer periphery.
Or the rotation speed detector described in 2.
たことを特徴とした請求項１又は２記載の回転数検出器
。4. The rotation speed detector according to claim 1, wherein the rotating permanent magnet is provided with magnetic poles in the axial direction.
及び複数のヨークを樹脂で一体に成形した樹脂モールド
部を設けたことを特徴とする請求項１，２，３又は４記
載の回転数検出器。5. The rotation speed detector according to claim 1, further comprising a resin molded portion in which the magnetic bubble element, the bias magnetic field magnet, and the plurality of yokes are integrally molded with resin. .
を除いて覆い、該樹脂モールド部を磁気遮蔽する磁気遮
蔽カバーを設けたことを特徴とする請求項５記載の回転
数検出器。6. The rotation speed detector according to claim 5, further comprising a magnetic shielding cover that covers the resin molded portion except for the other ends of the plurality of yokes and magnetically shields the resin molded portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5708491A JPH0754259B2 (en) | 1990-06-01 | 1991-03-20 | RPM detector |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2-141642 | 1990-06-01 | ||
| JP14164290 | 1990-06-01 | ||
| JP5708491A JPH0754259B2 (en) | 1990-06-01 | 1991-03-20 | RPM detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04212016A true JPH04212016A (en) | 1992-08-03 |
| JPH0754259B2 JPH0754259B2 (en) | 1995-06-07 |
Family
ID=26398092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5708491A Expired - Lifetime JPH0754259B2 (en) | 1990-06-01 | 1991-03-20 | RPM detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0754259B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006258741A (en) * | 2005-03-18 | 2006-09-28 | Denso Corp | Rotation angle detector |
| JP2007093418A (en) * | 2005-09-29 | 2007-04-12 | Nippon Soken Inc | Rotation angle detection device |
| CN115343501A (en) * | 2022-10-18 | 2022-11-15 | 四川新川航空仪器有限责任公司 | Variable magnetic flux type rotating speed sensor |
-
1991
- 1991-03-20 JP JP5708491A patent/JPH0754259B2/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006258741A (en) * | 2005-03-18 | 2006-09-28 | Denso Corp | Rotation angle detector |
| JP4720233B2 (en) * | 2005-03-18 | 2011-07-13 | 株式会社デンソー | Rotation angle detector |
| JP2007093418A (en) * | 2005-09-29 | 2007-04-12 | Nippon Soken Inc | Rotation angle detection device |
| JP4519750B2 (en) * | 2005-09-29 | 2010-08-04 | 株式会社日本自動車部品総合研究所 | Rotation angle detector |
| DE102006000492B4 (en) * | 2005-09-29 | 2020-10-22 | Denso Corporation | Rotation angle detection device |
| CN115343501A (en) * | 2022-10-18 | 2022-11-15 | 四川新川航空仪器有限责任公司 | Variable magnetic flux type rotating speed sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0754259B2 (en) | 1995-06-07 |
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