JPH09145305A - Angle detector - Google Patents
Angle detectorInfo
- Publication number
- JPH09145305A JPH09145305A JP31023495A JP31023495A JPH09145305A JP H09145305 A JPH09145305 A JP H09145305A JP 31023495 A JP31023495 A JP 31023495A JP 31023495 A JP31023495 A JP 31023495A JP H09145305 A JPH09145305 A JP H09145305A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- core
- magnetic pole
- piece
- pole piece
- 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
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
(57)【要約】
【課題】 コスト上昇を最小限に抑えながらも高感度お
よび高精度の角度検出ができる角度検出装置を提供す
る。
【解決手段】 同一線上に配設した磁極片１ａ、１ｂ、
１ｃを有するコア１を設けると共に、コア１の磁極片１
ｂに対向する第１の部分２２ａをコア１の磁極片１ｃに
対向する第２の部分２２ｂに対して磁極片１ａ、１ｂ、
１ｃの配設方向と直角方向にずらしたクランク形状の磁
性体片２２を設け、コア１を固定し、磁性体片２２をコ
ア１の各磁極片１ａ、１ｂ、１ｃ配設方向に対して直角
方向に回転自在とした。
(57) An object of the present invention is to provide an angle detection device capable of highly sensitive and highly accurate angle detection while suppressing an increase in cost to a minimum. SOLUTION: The magnetic pole pieces 1a, 1b are arranged on the same line.
1c is provided, and the pole piece 1 of the core 1 is provided.
The first portion 22a facing the magnetic pole piece 1a, 1b, and the second portion 22b facing the magnetic pole piece 1c of the core 1,
1c is provided at right angles to the arrangement direction of the crank, the core 1 is fixed, and the magnetic piece 22 is perpendicular to the magnetic pole pieces 1a, 1b, 1c of the core 1. Can be rotated in any direction.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、角度検出装置に関
する。TECHNICAL FIELD The present invention relates to an angle detection device.
【０００２】[0002]
【従来の技術】従来の角度検出装置として例えば実願昭
４９−８３１２８号公報に示されたものがある。図５は
当該公報に示された従来の角度検出装置の構成を示す図
であり、この図において、１は磁極片１ａ、１ｂ、１ｃ
を有するＥ型のコア、２は磁極片１ａに巻回されると共
に交流電源が供給される励磁コイル、３、４はそれぞれ
磁極片１ａ、１ｃに巻回され、差動出力を発生する検出
コイルである。５は磁極片１ａ、１ｂ、１ｃの配列方向
と同一方向に位置するように配置された回転軸であり、
角度検出対象である例えばペンモータに接続される。６
は回転軸５に取り付けられた円柱状鉄心であり、コア１
の磁極片１ａ、１ｂ、１ｃと対向する外周面の両端辺６
ａ、６ｂが互いに平行で且つ弦巻形状（図６も参照）に
形成されている。2. Description of the Related Art As a conventional angle detecting device, for example, there is one disclosed in Japanese Utility Model Application No. 49-83128. FIG. 5 is a diagram showing a configuration of a conventional angle detecting device shown in the publication, in which 1 is a pole piece 1a, 1b, 1c.
E-shaped core having 2 is an exciting coil which is wound around the magnetic pole piece 1a and is supplied with AC power, and 3 and 4 are detection coils which are wound around the magnetic pole pieces 1a and 1c, respectively, to generate a differential output. Is. Reference numeral 5 is a rotary shaft arranged so as to be positioned in the same direction as the arrangement direction of the magnetic pole pieces 1a, 1b, 1c,
It is connected to, for example, a pen motor that is an angle detection target. 6
Is a cylindrical iron core attached to the rotating shaft 5, and the core 1
End sides 6 of the outer peripheral surface facing the magnetic pole pieces 1a, 1b, 1c of
a and 6b are parallel to each other and are formed in a string shape (see also FIG. 6).
【０００３】コア１の磁極片１ａ、１ｂ、１ｃと円柱状
鉄心６との位置関係は図７に示すようになり、円柱状鉄
心６を展開することで平行四辺形となり、その端辺６ａ
または６ｂに相当する上辺７ａまたは７ｂが回転中心８
に対してθの角度になる。なお、この角度θが所謂弦巻
角である。The positional relationship between the pole pieces 1a, 1b, 1c of the core 1 and the cylindrical iron core 6 is as shown in FIG. 7, and when the cylindrical iron core 6 is expanded, it becomes a parallelogram, and its end side 6a.
Or the upper side 7a or 7b corresponding to 6b is the center of rotation 8
Is an angle of θ with respect to. The angle θ is a so-called wrap angle.
【０００４】動作としては、円柱状鉄心６をペンモータ
等の回転体と共に回転させると、固定されたコア側から
見た円柱状鉄心６は、その回転角に正比例して上方また
は下方へ移動することになる。そして、円柱状鉄心６が
上方へ移動した場合には円柱状鉄心６と磁極辺１ｂとが
重なる部分の面積は増大して行き、円柱状鉄心６と磁極
辺１ｃとが重なる部分の面積が減少して行く。即ち、円
柱状鉄心６と磁極辺１ｂとの間の磁気抵抗が減少して行
き、円柱状鉄心６と磁極辺１ｃとの間の磁気抵抗が増加
して行く。逆に、円柱状鉄心６が下方へ移動した場合に
は上記現象が反対になる。而して、検出コイル３および
４の出力に基づく差動の出力電圧は弦巻形状端辺６ａ、
６ｂの不連続部分が検出コイル３および４を巻回した磁
極片１ｂ、１ｃと対向するまで略一様に変化する。その
様子は図８の直線９のようになる。なお、弦巻角θを大
きくするにしたがって出力特性は図８の直線１０、１１
のようになる。In operation, when the cylindrical iron core 6 is rotated together with a rotating body such as a pen motor, the cylindrical iron core 6 viewed from the fixed core side moves upward or downward in direct proportion to the rotation angle. become. When the cylindrical core 6 moves upward, the area where the cylindrical core 6 and the magnetic pole side 1b overlap increases, and the area where the cylindrical core 6 and the magnetic pole side 1c overlap decreases. To go. That is, the magnetic resistance between the cylindrical iron core 6 and the magnetic pole side 1b decreases, and the magnetic resistance between the cylindrical iron core 6 and the magnetic pole side 1c increases. On the contrary, when the cylindrical core 6 moves downward, the above phenomenon is reversed. Thus, the differential output voltage based on the outputs of the detection coils 3 and 4 is the winding-shaped end side 6a,
The discontinuous portion 6b changes substantially uniformly until it faces the magnetic pole pieces 1b and 1c around which the detection coils 3 and 4 are wound. The situation is as shown by the straight line 9 in FIG. It should be noted that as the winding angle θ is increased, the output characteristics are shown by the straight lines 10 and 11 in FIG.
become that way.
【０００５】[0005]
【発明が解決しようとする課題】ところで、上述した従
来の角度検出装置にあっては、回転角の変化をコア１の
両端辺６ａ、６ｂの上下方向の移動量に変えるようにし
ているので、回転角の変化に対する上下方向の移動量が
小さいことから広範囲の角度検出ができるという利点を
有している。しかしながら、上下方向の移動量が小さい
ことから、コア１の両端辺６ａ、６ｂの加工精度を高め
なければ高精度且つ高感度が得られないので、コスト的
にみて高いものになってしまう。By the way, in the above-mentioned conventional angle detecting device, since the change of the rotation angle is changed to the moving amount of the both ends 6a, 6b of the core 1 in the vertical direction, Since the vertical movement amount is small with respect to the change in the rotation angle, there is an advantage that the angle can be detected in a wide range. However, since the amount of movement in the vertical direction is small, high precision and high sensitivity cannot be obtained unless the processing precision of both end sides 6a, 6b of the core 1 is increased, which is high in terms of cost.
【０００６】例えば、今、図８の直線９で示す出力特性
となる弦巻角がθである場合に、コア１の両端辺６ａ、
６ｂの平行がとれなければ直線１１で示す出力特性にな
ってしまう。また、コア１の両端辺６ａ、６ｂの平行が
とれていても、図９に示すようにこれらの辺の加工精度
が悪ければ図１０に示すようにノイズが発生してしま
う。このように、高感度および高精度で角度検出を可能
にするためにコア１の両端辺６ａ、６ｂの加工精度を高
くしなければならず、このためコスト高になってしまう
という問題点があった。For example, when the winding angle having the output characteristic shown by the straight line 9 in FIG. 8 is θ, both end sides 6a of the core 1 are
If the parallelism of 6b cannot be obtained, the output characteristic shown by the straight line 11 will be obtained. Further, even if both ends 6a and 6b of the core 1 are parallel to each other, noise is generated as shown in FIG. 10 if the processing accuracy of these sides is poor as shown in FIG. As described above, in order to enable angle detection with high sensitivity and high accuracy, it is necessary to increase the processing accuracy of both end sides 6a and 6b of the core 1, which causes a problem of cost increase. It was
【０００７】そこで本発明は、コスト上昇を最小限に抑
えながらも高感度および高精度の角度検出ができる角度
検出装置を提供することを目的としている。[0007] Therefore, an object of the present invention is to provide an angle detecting device capable of detecting an angle with high sensitivity and accuracy while suppressing an increase in cost to a minimum.
【０００８】[0008]
【課題を解決するための手段】請求項１の発明は、励磁
コイルが巻回された少なくとも一つの磁極片及び該磁極
片を挟んで互いに平行になるように配置され、それぞれ
に検出コイルが巻回された二つの磁極片が設けられたコ
アと、このコアの検出コイルが巻回された一方の磁極片
に対向する第１の部分を検出コアが巻回された他方の磁
極片に対向する第２の部分に対して前記各磁極片の配設
方向と直角方向にずらしたクランク形状の磁性体片と、
を備えるものである。According to a first aspect of the invention, at least one magnetic pole piece around which an exciting coil is wound, and the magnetic pole piece are arranged so as to be parallel to each other, and a detection coil is wound around each of the magnetic pole pieces. A core provided with two wound magnetic pole pieces and a first portion of the core facing the one magnetic pole piece around which the detection coil is wound face the other magnetic pole piece around which the detection core is wound. A crank-shaped magnetic piece that is displaced relative to the second portion in a direction perpendicular to the direction in which the magnetic pole pieces are arranged;
It is provided with.
【０００９】この構成によれば、例えばコアを固定し、
磁性体片をコアの各磁極片の配設方向に対して直角方向
に回転できるようにして、該磁性体片を、その第１の部
分が検出コイルが巻回された一方の磁極片から遠ざか
り、第２の部分が検出コイルが巻回された他方の磁極片
に近付く方向に移動させると、その第１の部分と一方の
磁極片との重なる部分の面積が減少して行き、これによ
ってこの間の磁気抵抗が増加して行く。これに対して、
磁性体片の第２の部分と他方の磁極片との重なる部分の
面積が増加して行き、これによってこの間の磁気抵抗が
減少して行く。而して、二つの検出コイルの出力に基づ
く差動の出力電圧は、磁性体片の第１の部分と一方の磁
極片との重なる部分が無くなるまで一様に変化する。According to this structure, for example, the core is fixed,
The magnetic piece is made to be rotatable in the direction perpendicular to the direction in which the magnetic pole pieces of the core are arranged, and the magnetic piece is moved away from the magnetic pole piece having the first portion wound around the detection coil. , When the second portion is moved in a direction of approaching the other magnetic pole piece around which the detection coil is wound, the area of the overlapping portion of the first magnetic pole piece and the one magnetic pole piece decreases, which causes Reluctance increases. On the contrary,
The area of the portion where the second portion of the magnetic piece overlaps with the other magnetic pole piece increases, and as a result, the magnetic resistance between them increases. Thus, the differential output voltage based on the outputs of the two detection coils changes uniformly until there is no overlapping portion between the first portion of the magnetic piece and one magnetic pole piece.
【００１０】逆に、磁性体片を、その第１の部分が一方
の磁極片から近付き、第２の部分が他方の磁極片から遠
ざかる方向に移動させると、その第１の部分と一方の磁
極片との重なる部分の面積が増加して行き、これによっ
てこの間の磁気抵抗が減少して行く。これに対して、磁
性体片の第２の部分と他方の磁極片との重なる部分の面
積が減少して行き、これによってこの間の磁気抵抗が増
加して行く。而して、二つの検出コイルの出力に基づく
差動の出力電圧は、磁性体片の第２の部分と他方の磁極
片との重なる部分が無くなるまで一様に変化する。した
がって、回転自在とした方の角度の変化に対する磁束の
変化、即ちコアの中央の磁極片と両側の一方の磁極片と
の間に形成される磁路および中央の磁極片と両側の他方
の磁極片との間に形成される磁路の各々における磁束の
変化に対応することから、回転角を高感度で検出するこ
とができ、また磁性体片のコアに対する直角方向の辺の
加工精度が多少悪くてもノイズは殆ど発生しない。On the contrary, when the magnetic piece is moved in such a direction that the first portion of the magnetic piece approaches one of the magnetic pole pieces and the second portion of the magnetic piece moves away from the other magnetic pole piece, the first portion and one magnetic pole are moved. The area of the overlapping portion with the piece increases, and thereby the magnetic resistance between the areas decreases. On the other hand, the area of the portion where the second portion of the magnetic piece and the other magnetic pole piece overlap with each other decreases, which increases the magnetic resistance in the meantime. Thus, the differential output voltage based on the outputs of the two detection coils changes uniformly until there is no overlapping portion between the second portion of the magnetic piece and the other magnetic pole piece. Therefore, the change in the magnetic flux with respect to the change in the rotatable angle, that is, the magnetic path formed between the magnetic pole piece in the center of the core and one of the magnetic pole pieces on both sides, and the magnetic pole piece in the center and the other magnetic pole on both sides. Since it corresponds to the change of magnetic flux in each magnetic path formed between the magnetic piece and the piece, the rotation angle can be detected with high sensitivity, and the machining accuracy of the side of the magnetic piece in the direction perpendicular to the core may be slightly different. Even if it is bad, there is almost no noise.
【００１１】[0011]
【発明の実施の形態】以下、図面を参照して本発明の角
度検出装置の実施例について説明する。 Ａ．角度検出装置の構成 図１は本発明に係る角度検出装置の一実施例の構成を示
す図である。なお、この図において、前述した図５と共
通する部分には同一の符号と付してその説明を省略す
る。図１において、Ｅ型のコア１の磁極片１ａに巻回さ
れた励磁コイル２には励磁回路２０から数ｋＨｚの交流
電圧が印加される。コア１の磁極片１ｂに巻回された検
出コイル３の巻き終わり側の端が接地されており、巻き
初め側の端が差動増幅器２１の非反転入力端に接続され
ている。同様にコア１の磁極片１ｃに巻回された検出コ
イル４の巻き終わり側の端が接地されており、巻き初め
側の端が差動増幅器２１の非反転入力端に接続されてい
る。ここで、コア１の各磁極片１ａ、１ｂ、１ｃは、こ
の図に示すように同一線上に配置されており、また互い
に平行になっている。この場合、特に磁極片１ｂと１ｃ
とが互いに平行になっていることが必須の条件である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an angle detecting device of the present invention will be described below with reference to the drawings. A. Configuration of Angle Detection Device FIG. 1 is a diagram showing the configuration of an embodiment of the angle detection device according to the present invention. In this figure, parts common to those in FIG. 5 described above are designated by the same reference numerals, and description thereof will be omitted. In FIG. 1, an exciting circuit 20 applies an alternating voltage of several kHz to an exciting coil 2 wound around a magnetic pole piece 1a of an E-shaped core 1. The end of the detection coil 3 wound around the magnetic pole piece 1b of the core 1 on the winding end side is grounded, and the end on the winding start side is connected to the non-inverting input end of the differential amplifier 21. Similarly, the end on the winding end side of the detection coil 4 wound around the magnetic pole piece 1c of the core 1 is grounded, and the end on the winding start side is connected to the non-inverting input end of the differential amplifier 21. Here, the magnetic pole pieces 1a, 1b, 1c of the core 1 are arranged on the same line as shown in this figure and are parallel to each other. In this case, especially the pole pieces 1b and 1c
It is essential that and are parallel to each other.
【００１２】一方、コア１に対向する位置には図示のよ
うに第１の部分２２ａが第２の部分２２ｂに対して水平
方向にずれたクランク形状の磁性体片２２が配置されて
いる。なお、この実施例ではコア１が固定されていて、
磁性体片２２がコア１に対して直角方向に回転自在にな
っているものとする。コア１と磁性体片２２の形状の関
係は図２に示すようにコア１の磁極片１ａ、１ｂ、１ｃ
の横方向の長さをＬ2 、Ｌ1 、Ｌ3 とし、磁性体片２２
の第１および第２の部分２２ａ、２２ｂの横方向の長さ
をＬ4 とすると、 Ｌ4 ≧Ｌ2 、Ｌ1 、Ｌ3 となり、また、コア１の磁極片１ｂ、１ｃの横方向の長
は、 Ｌ1 ＝Ｌ3 となる。また、コア１の磁極片１ｂ、１ｃの縦方向の長
さをＬ5 、Ｌ6 とすると、 Ｌ5 ＝Ｌ6 となる。On the other hand, a crank-shaped magnetic material piece 22 in which the first portion 22a is horizontally displaced from the second portion 22b is arranged at a position facing the core 1 as shown in the figure. In this embodiment, the core 1 is fixed,
It is assumed that the magnetic piece 22 is rotatable in the direction perpendicular to the core 1. As shown in FIG. 2, the relationship between the shapes of the core 1 and the magnetic pieces 22 is the magnetic pole pieces 1a, 1b, 1c of the core 1.
Let L 2 , L 1 and L 3 be horizontal lengths of the magnetic piece 22.
Let L 4 be the lateral lengths of the first and second portions 22a and 22b of the above, then L 4 ≧ L 2 , L 1 and L 3 , and the lateral lengths of the pole pieces 1b and 1c of the core 1 The length is L 1 = L 3 . Further, when the pole piece 1b of the core 1, the longitudinal 1c length and L 5, L 6, the L 5 = L 6.
【００１３】Ｂ．角度検出装置の動作 次に、図３を参照しながら上記構成による角度検出装置
の動作について説明する。この図は、磁性体片２２の第
１の部分２２ａの図面右側の辺Ｅａと第２の部分２２ｂ
の図面左側の辺Ｅｂとがコア１の磁極片１ｂ、１ｃの中
央部分に来ている状態を示している。この状態では、磁
性体片２２の第１の部分２２ａとコア１の磁極片１ｂと
が重なる部分の面積Ｓｂと、磁性体片２２の第２の部分
２２ｂとコア１の磁極片１ｃとが重なる部分の面積Ｓｃ
とが同じになっているので、コア１の磁極片１ａと１ｂ
との間の磁気抵抗と、磁極片１ａと１ｃとの間の磁気抵
抗が等しくなっている。B. Operation of Angle Detection Device Next, the operation of the angle detection device having the above configuration will be described with reference to FIG. This figure shows the side Ea of the first portion 22a of the magnetic piece 22 on the right side of the drawing and the second portion 22b.
The side Eb on the left side of the drawing of FIG. 2A is located at the center of the magnetic pole pieces 1b and 1c of the core 1. In this state, the area Sb of the portion where the first portion 22a of the magnetic piece 22 and the magnetic pole piece 1b of the core 1 overlap with each other, and the second portion 22b of the magnetic piece 22 overlaps with the magnetic pole piece 1c of the core 1. Area of part Sc
Are the same, so the pole pieces 1a and 1b of the core 1
And the magnetic resistance between the magnetic pole pieces 1a and 1c are equal.
【００１４】さて、この状態から、例えば磁性体片２２
を矢印Ｄａ方向へ移動させて行くと、磁性体片２２の第
１の部分２２ａとコア１の磁極片１ｂとが重なる部分の
面積Ｓｂが減少して行く一方、磁性体片２２の第２の部
分２２ｂとコア１の磁極片１ｃとが重なる部分の面積Ｓ
ｃが増加して行く。この状態を磁気的に見れば、コア１
の磁極片１ａと磁極片１ｂとの間の磁気抵抗が増加して
行き、磁極片１ａと磁極片ｃｂとの間の磁気抵抗が減少
して行くことになる。この場合、磁気抵抗が増加する
と、コア１の磁極片１ａと磁極片１ｂまたは１ｃとの間
で形成される磁路を流れる磁束が減少して誘起電圧が減
少する。他方、磁気抵抗が減少すると、コア１の磁極片
１ａと磁極片１ｂまたは１ｃとの間で形成される磁路を
流れる磁束が増加して誘起電圧が増加する。From this state, for example, the magnetic piece 22
Is moved in the direction of arrow Da, the area Sb of the portion where the first portion 22a of the magnetic piece 22 and the magnetic pole piece 1b of the core 1 overlap decreases, while the second area of the magnetic piece 22 decreases. Area S of the portion where the portion 22b and the pole piece 1c of the core 1 overlap
c increases. If this state is seen magnetically, core 1
The magnetic resistance between the magnetic pole piece 1a and the magnetic pole piece 1b increases, and the magnetic resistance between the magnetic pole piece 1a and the magnetic pole piece cb decreases. In this case, when the magnetic resistance increases, the magnetic flux flowing in the magnetic path formed between the magnetic pole piece 1a of the core 1 and the magnetic pole piece 1b or 1c decreases, and the induced voltage decreases. On the other hand, when the magnetic resistance decreases, the magnetic flux flowing in the magnetic path formed between the magnetic pole piece 1a of the core 1 and the magnetic pole piece 1b or 1c increases, and the induced voltage increases.
【００１５】一方、最初の状態から、磁性体片２２を矢
印Ｄｂ方向へ移動させて行くと、磁性体片２２の第１の
部分２２ａとコア１の磁極片１ｂとが重なる部分の面積
Ｓｂが増加して行く一方、磁性体片２２の第２の部分２
２ｂとコア１の磁極片１ｃとが重なる部分の面積Ｓｃが
減少して行く。この状態を磁気的に見れば、コア１の磁
極片１ａと磁極片１ｂとの間の磁気抵抗が減少して行
き、磁極片１ａと磁極片ｃｂとの間の磁気抵抗が増加し
て行くことになる。而して、検出コイル３および４の出
力に基づく差動の出力電圧は磁性体片２２の第１の部分
２２ａの辺Ｅａがコア１の磁極片１ｂから外れるまで、
または第２の部分２２ｂの辺Ｅｂがコア１の磁極片１ｃ
から外れるまで一様に変化する。On the other hand, when the magnetic piece 22 is moved in the direction of the arrow Db from the initial state, the area Sb of the portion where the first portion 22a of the magnetic piece 22 and the magnetic pole piece 1b of the core 1 overlap with each other becomes smaller. While increasing, the second portion 2 of the magnetic piece 22
The area Sc of the portion where 2b and the magnetic pole piece 1c of the core 1 overlap decreases. From a magnetic point of view, the magnetic resistance between the magnetic pole pieces 1a and 1b of the core 1 decreases and the magnetic resistance between the magnetic pole pieces 1a and cb increases. become. Thus, the differential output voltage based on the outputs of the detection coils 3 and 4 is applied until the side Ea of the first portion 22a of the magnetic piece 22 is separated from the magnetic pole piece 1b of the core 1.
Alternatively, the side Eb of the second portion 22b is the pole piece 1c of the core 1.
It changes uniformly until it comes off.
【００１６】図４はその様子を示す出力特性図であり、
例えば磁性体片２２の第１の部分２２ａの辺Ｅａがコア
１の磁極片１ｂの辺（図３の符号Ｅｃで示す辺）と一致
した位置Ｐ1 にある場合には出力が最大になり、その位
置から磁性体辺２２が矢印Ｄａ方向へ移動して行くと、
それに応じて出力電圧が減少して行く。そして、磁性体
片２２が図３に示すような位置Ｐ2 に来ると、出力はゼ
ロになる。その後、矢印Ｄａへ磁性体辺２２が移動して
行き、磁性体片２２の第２の部分２２ｂの辺Ｅｂがコア
１の磁極片１ｃの辺（図３の符号Ｅｄで示す辺）と一致
した位置Ｐ3 に来ると、出力は負の最大になる。この位
置Ｐ1 から位置Ｐ3 までの間が検出範囲となる。FIG. 4 is an output characteristic diagram showing the situation.
For example, when the side Ea of the first portion 22a of the magnetic piece 22 is at the position P 1 which coincides with the side of the magnetic pole piece 1b of the core 1 (the side indicated by the reference symbol Ec in FIG. 3), the output becomes maximum, When the magnetic material side 22 moves from that position in the direction of the arrow Da,
The output voltage decreases accordingly. When the magnetic piece 22 reaches the position P 2 as shown in FIG. 3, the output becomes zero. After that, the magnetic body side 22 moves toward the arrow Da, and the side Eb of the second portion 22b of the magnetic body piece 22 coincides with the side of the magnetic pole piece 1c of the core 1 (the side indicated by reference numeral Ed in FIG. 3). At position P 3 , the output has a negative maximum. The detection range is from the position P 1 to the position P 3 .
【００１７】このようにこの実施例では、同一線上に配
設した磁極片１ａ、１ｂ、１ｃを有するコア１を設ける
と共に、コア１の磁極片１ｂに対向する第１の部分２２
ａをコア１の磁極片１ｃに対向する第２の部分２２ｂに
対して磁極片１ａ、１ｂ、１ｃの配設方向と直角方向に
ずらしたクランク形状の磁性体片２２を設け、コア１を
固定し、磁性体片２２をコア１の各磁極片１ａ、１ｂ、
１ｃ配設方向に対して直角方向に回転できるようにした
ので、磁性体片２２の角度の変化に対する磁束の変化
（即ちコア１の磁極片１ａと磁極片１ｂとの間に形成さ
れる磁路および磁極片１ａと磁極片１ｃとの間に形成さ
れる磁路の各々における磁束の変化）に対応することか
ら、角度の変化を高感度で検出することができ、また磁
性体片２２のコア１に対する直角方向の辺の加工精度が
多少悪くてもノイズは殆ど発生しない。したがって、コ
スト上昇を最小限に抑えながらも高感度および高精度の
角度検出ができる角度検出装置が得られる。As described above, in this embodiment, the core 1 having the magnetic pole pieces 1a, 1b, 1c arranged on the same line is provided, and the first portion 22 of the core 1 facing the magnetic pole piece 1b is provided.
A crank-shaped magnetic material piece 22 is provided in which a is displaced in a direction perpendicular to the arrangement direction of the magnetic pole pieces 1a, 1b, 1c with respect to the second portion 22b facing the magnetic pole piece 1c of the core 1, and the core 1 is fixed. Then, the magnetic piece 22 is connected to the magnetic pole pieces 1a, 1b of the core 1,
Since it can rotate in the direction perpendicular to the disposition direction of 1c, the change of the magnetic flux with respect to the change of the angle of the magnetic piece 22 (that is, the magnetic path formed between the magnetic pole piece 1a and the magnetic pole piece 1b of the core 1). And changes in the magnetic flux in each of the magnetic paths formed between the magnetic pole pieces 1a and 1c), the angle change can be detected with high sensitivity, and the core of the magnetic material piece 22 can be detected. Even if the processing accuracy of the side in the direction perpendicular to 1 is somewhat poor, noise hardly occurs. Therefore, it is possible to obtain the angle detection device capable of detecting the angle with high sensitivity and high accuracy while suppressing the cost increase to the minimum.
【００１８】なお、上記実施例では、コア１を固定して
磁性体片２２を回転自在としたが、逆であっても勿論構
わない。また、上記実施例では、コア１の形状をＥ型と
したが、各磁極片１ａ、１ｂ、１ｃが各々の独立したも
のであっても構わない。例えば、カセットテープレコー
ダに使用されている磁気ヘッドのような形状を成したも
のを同一線上に配設するようにしてもよい。この場合、
検出側の磁極片は互いに平行にしなければならないこと
は言うまでもない。また、上記実施例では、磁性体片２
２を図に示すようなクランク形状としたが、必ずしもこ
のような形状にする必要はなく、要は第１の部分２２ａ
と第２の部分２２ｂが磁極片１ａ、１ｂ、１ｃの配設方
向に対して直角方向にずれていればよいので全体の形状
は任意である。また、上記実施例では、角度検出するよ
うにしたが、コア１に対して磁性体片２２を平行移動さ
せるようにすれば変位の検出も勿論可能である。Although the core 1 is fixed and the magnetic piece 22 is rotatable in the above embodiment, the magnetic pieces 22 may be reversed, of course. Further, in the above embodiment, the shape of the core 1 is E, but the magnetic pole pieces 1a, 1b, 1c may be independent. For example, a magnetic head used in a cassette tape recorder may be arranged on the same line. in this case,
It goes without saying that the pole pieces on the detection side must be parallel to each other. Further, in the above embodiment, the magnetic piece 2
Although 2 has a crank shape as shown in the drawing, it does not necessarily have to be such a shape, and the point is that the first portion 22a is essential.
Since the second portion 22b only needs to be displaced in the direction perpendicular to the direction in which the magnetic pole pieces 1a, 1b, 1c are arranged, the overall shape is arbitrary. Further, in the above-described embodiment, the angle is detected, but the displacement can of course be detected by moving the magnetic piece 22 in parallel with the core 1.
【００１９】[0019]
【発明の効果】以上説明したように請求項１に記載の角
度検出装置によれば、励磁コイルを巻回させた磁極片を
挟んで両側に互いに平行に検出コイルを巻回させた二つ
の磁極片を配設したコアと、検出コイルを巻回させた二
つの磁極片のうちの一方に対向する第１の部分を磁極片
の他方に対向する第２の部分に対して各磁極片の配設方
向と直角方向にずらしたクランク形状の磁性体片とを備
え、コアまたは磁性体片のいずれか一方を固定し、他方
を回転自在としたので、回転自在とした方の角度の変化
に対する磁束の変化、即ちコアの中央の磁極片と両側の
一方の磁極片との間に形成される磁路および中央の磁極
片と両側の他方の磁極片との間に形成される磁路の各々
における磁束の変化に対応することから、回転角を高感
度で検出することができ、また磁性体片のコアに対する
直角方向の辺の加工精度が多少悪くてもノイズは殆ど発
生しない。As described above, according to the angle detecting device of the first aspect, the two magnetic poles having the detection coil wound in parallel with each other with the magnetic pole piece wound with the exciting coil interposed therebetween. Of the magnetic pole pieces with respect to the second portion facing the other of the magnetic pole pieces, and the first portion facing one of the two magnetic pole pieces wound with the detection coil. It has a crank-shaped magnetic material piece that is displaced in the direction perpendicular to the installation direction, and either the core or the magnetic material piece is fixed and the other is rotatable, so the magnetic flux with respect to the change in the angle of the rotatable one. In the magnetic path formed between the magnetic pole piece in the center of the core and one of the magnetic pole pieces on both sides of the core and in the magnetic path formed between the magnetic pole piece in the center and the other magnetic pole pieces on both sides. Detects rotation angle with high sensitivity because it responds to changes in magnetic flux Can, also noise hardly occurs even if somewhat poor machining accuracy of the direction perpendicular sides relative to the core of the magnetic body pieces.
【図１】本発明に係る角度検出装置の一実施例の構成を
示す斜視図である。FIG. 1 is a perspective view showing a configuration of an embodiment of an angle detection device according to the present invention.
【図２】同実施例の角度検出装置の各部の寸法を示す図
である。FIG. 2 is a diagram showing dimensions of each part of the angle detection device of the embodiment.
【図３】同実施例の角度検出装置の動作を説明するため
の図である。FIG. 3 is a view for explaining the operation of the angle detection device of the same embodiment.
【図４】同実施例の角度検出装置の出力特性を示す図で
ある。FIG. 4 is a diagram showing output characteristics of the angle detection device of the same embodiment.
【図５】従来の角度検出装置の構成を示す図である。FIG. 5 is a diagram showing a configuration of a conventional angle detection device.
【図６】従来の角度検出装置の円柱状鉄心の図４に示す
方向とは反対側の方向より見た図である。FIG. 6 is a view of a cylindrical iron core of a conventional angle detection device as seen from a direction opposite to the direction shown in FIG.
【図７】従来の角度検出装置のコアと円柱状鉄心との位
置関係を示す概念図である。FIG. 7 is a conceptual diagram showing a positional relationship between a core and a cylindrical iron core of a conventional angle detection device.
【図８】従来の角度検出装置の出力特性を示す図であ
る。FIG. 8 is a diagram showing output characteristics of a conventional angle detection device.
【図９】従来の角度検出装置の問題点を説明するための
図である。FIG. 9 is a diagram for explaining a problem of a conventional angle detection device.
【図１０】従来の角度検出装置の問題点を説明するため
の図である。FIG. 10 is a diagram for explaining a problem of the conventional angle detection device.
１ コア １ａ、１ｂ、１ｃ 磁極片 ２ 励磁コイル ３、４ 検出コイル ２０ 励磁回路 ２１ 差動増幅回路 ２２ 磁性体片 ２２ａ 磁性体の第１の部分 ２２ｂ 磁性体の第２の部分 DESCRIPTION OF SYMBOLS 1 core 1a, 1b, 1c magnetic pole piece 2 excitation coil 3, 4 detection coil 20 excitation circuit 21 differential amplification circuit 22 magnetic material piece 22a first portion of magnetic material 22b second portion of magnetic material
Claims (1)
の磁極片及び該磁極片を挟んで互いに平行になるように
配置され、それぞれに検出コイルが巻回された二つの磁
極片が設けられたコアと、 このコアの検出コイルが巻回された一方の磁極片に対向
する第１の部分を検出コアが巻回された他方の磁極片に
対向する第２の部分に対して前記各磁極片の配設方向と
直角方向にずらしたクランク形状の磁性体片と、を備え
たことを特徴とする角度検出装置。1. An at least one magnetic pole piece around which an exciting coil is wound, and two magnetic pole pieces around which a detection coil is wound are arranged so as to be parallel to each other with the magnetic pole piece sandwiched therebetween. The core and a first portion of the core facing the one magnetic pole piece around which the detection coil is wound, and a second portion of the core facing the other magnetic pole piece around which the detection core is wound. And a crank-shaped magnetic piece that is displaced in a direction perpendicular to the direction in which the angle is arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31023495A JP3358074B2 (en) | 1995-11-29 | 1995-11-29 | Angle detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31023495A JP3358074B2 (en) | 1995-11-29 | 1995-11-29 | Angle detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09145305A true JPH09145305A (en) | 1997-06-06 |
| JP3358074B2 JP3358074B2 (en) | 2002-12-16 |
Family
ID=18002804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31023495A Expired - Fee Related JP3358074B2 (en) | 1995-11-29 | 1995-11-29 | Angle detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3358074B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11185919A (en) * | 1997-12-25 | 1999-07-09 | Alps Electric Co Ltd | Rotary connector with angle detection function |
| JP2011247592A (en) * | 2010-05-21 | 2011-12-08 | Tamagawa Seiki Co Ltd | Linear sensor |
| JP2012032199A (en) * | 2010-07-29 | 2012-02-16 | Tamagawa Seiki Co Ltd | Rotary sensor |
| JP2012042273A (en) * | 2010-08-17 | 2012-03-01 | Tamagawa Seiki Co Ltd | Multiple redundant type linear sensor |
| WO2018230244A1 (en) * | 2017-06-16 | 2018-12-20 | 株式会社デンソー | Position sensor |
| WO2021024390A1 (en) * | 2019-08-06 | 2021-02-11 | 三菱電機株式会社 | Displacement sensor, motor, and actuator |
-
1995
- 1995-11-29 JP JP31023495A patent/JP3358074B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11185919A (en) * | 1997-12-25 | 1999-07-09 | Alps Electric Co Ltd | Rotary connector with angle detection function |
| JP2011247592A (en) * | 2010-05-21 | 2011-12-08 | Tamagawa Seiki Co Ltd | Linear sensor |
| JP2012032199A (en) * | 2010-07-29 | 2012-02-16 | Tamagawa Seiki Co Ltd | Rotary sensor |
| JP2012042273A (en) * | 2010-08-17 | 2012-03-01 | Tamagawa Seiki Co Ltd | Multiple redundant type linear sensor |
| WO2018230244A1 (en) * | 2017-06-16 | 2018-12-20 | 株式会社デンソー | Position sensor |
| JP2019002835A (en) * | 2017-06-16 | 2019-01-10 | 株式会社デンソー | Position sensor |
| CN110741231A (en) * | 2017-06-16 | 2020-01-31 | 株式会社电装 | position sensor |
| US11099034B2 (en) | 2017-06-16 | 2021-08-24 | Denso Corporation | Position sensor |
| CN110741231B (en) * | 2017-06-16 | 2022-04-01 | 株式会社电装 | Position sensor |
| WO2021024390A1 (en) * | 2019-08-06 | 2021-02-11 | 三菱電機株式会社 | Displacement sensor, motor, and actuator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3358074B2 (en) | 2002-12-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4292967B2 (en) | Magnetostrictive torque sensor | |
| JP2012225921A (en) | Current sensor with magnetic core | |
| JPH07139905A (en) | Rotary angle sensor | |
| JP3041342B2 (en) | Magnetic bearing device | |
| EP0435232B1 (en) | Inductance-type displacement sensor having resistance to external magnetic fields | |
| JPH1198784A (en) | Concentric control device for non-coaxial induction motor | |
| JPH09145305A (en) | Angle detector | |
| JPH0530716A (en) | Rotor axial displacement detector in induction motor | |
| KR0153451B1 (en) | Magnetic bearing device | |
| JP2588034B2 (en) | Inductance displacement sensor | |
| JPH0612492Y2 (en) | Displacement converter | |
| JP2641485B2 (en) | Inductance type displacement sensor device | |
| JP3066892B2 (en) | Angle detector | |
| JPH0129521Y2 (en) | ||
| JP2578140Y2 (en) | Pickup sensor | |
| JPH07139966A (en) | Magnetic encoder | |
| TWM657104U (en) | Motor rotor position sensor | |
| JPS63107849U (en) | ||
| JPH03277963A (en) | Magnetic flaw detecting apparatus | |
| JPH01260332A (en) | magnetostrictive torque sensor | |
| JPH048728B2 (en) | ||
| JPH076709U (en) | Variable reluctance resolver | |
| JPH08114515A (en) | Magnetostriction type torque sensor | |
| JP3132598B2 (en) | Phase detector | |
| JPH0344508A (en) | Magnetic detector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20020903 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081011 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091011 Year of fee payment: 7 |
|
| LAPS | Cancellation because of no payment of annual fees |