JP2007263585A - Rotation angle detector - Google Patents

Rotation angle detector Download PDF

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Publication number
JP2007263585A
JP2007263585A JP2006085368A JP2006085368A JP2007263585A JP 2007263585 A JP2007263585 A JP 2007263585A JP 2006085368 A JP2006085368 A JP 2006085368A JP 2006085368 A JP2006085368 A JP 2006085368A JP 2007263585 A JP2007263585 A JP 2007263585A
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Prior art keywords
magnetic
magnet
rotation angle
detection means
axial direction
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Takashi Kawashima
貴 川嶋
Kenji Takeda
武田　　憲司
Shinji Hatanaka
真二 畑中
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Denso Corp
Soken Inc
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Denso Corp
Nippon Soken Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation angle detector that is less likely to be affected by external magnetic field, and that is capable of increasing the magnetic field density, imparted from a magnet to the first and second magnetic sensors. <P>SOLUTION: The first and second magnetic sensors 3, 4 are arranged along an axial direction of the magnet 2, and the magnet 2 is magnetically attracted axially to direct a magnetic force line along the axial direction, and generates a sine curve magnetic field, in response to a rotation angle of the magnet 2, with respect to the first and second magnetic sensors 3, 4. The underface of the magnet 2 is covered with a yoke 5, comprising a disk made of a magnetic substance. Since the yoke 5 effects the magnetic shielding function on the underface of the magnet 2, the external magnetic field will not reach the first and second magnetic sensors 3, 4, even if the external magnetic field is supplied from the underface of the magnet 2. A magnetic efficiency is enhanced in the underface side of the magnet 2 by the yoke 5, the magnetic density imparted from the magnet 2 to the first and second magnetic sensors 3, 4 is also enhanced as a result thereof, angle detection errors are thereby restrained to be small, and robustness is thereby enhanced also. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、２つの部材（例えば、回転部材と非回転部材）の相対回転角度を非接触で検出する回転角度検出装置に関する。   The present invention relates to a rotation angle detection device that detects a relative rotation angle between two members (for example, a rotation member and a non-rotation member) in a non-contact manner.

（従来技術）
２つの部材の相対回転角度を非接触で検出する回転角度検出装置として、図１（ａ）、（ａ’）に示す技術が知られている（例えば、特許文献１参照）。
この特許文献１に開示される回転角度検出装置は、図１（ａ）、（ａ’）に示すように、円盤形状を呈する磁石２（外周縁の軸心とシャフト１の回転軸とが略一致し、回転軸に対して垂直方向の一方から他方に向けて磁力線が向くように着磁された磁石）と、この磁石２の外縁近傍に配置されて磁石２から放出される磁力線に応じた出力を発生する磁気検出手段とを備える。
磁気検出手段は、磁石２から与えられる磁気変化を検出する第１磁気センサ３と、第１磁気センサ３に対して９０°位相のズレた磁気変化を検出する第２磁気センサ４とで構成される。 (Conventional technology)
As a rotation angle detection device that detects the relative rotation angle of two members in a non-contact manner, a technique shown in FIGS. 1A and 1A is known (for example, see Patent Document 1).
As shown in FIGS. 1 (a) and 1 (a '), the rotation angle detection device disclosed in Patent Document 1 includes a magnet 2 having a disk shape (the axial center of the outer peripheral edge and the rotation axis of the shaft 1 are substantially the same). The magnets are magnetized so that the magnetic lines of force are directed from one side to the other in the direction perpendicular to the rotation axis), and are arranged in the vicinity of the outer edge of the magnet 2 and correspond to the magnetic lines of force emitted from the magnet 2 Magnetic detection means for generating an output.
The magnetic detection means includes a first magnetic sensor 3 that detects a magnetic change applied from the magnet 2, and a second magnetic sensor 4 that detects a magnetic change that is 90 ° out of phase with the first magnetic sensor 3. The

２つの部材が相対回転すると、図２（ａ）に示すように、第１、第２磁気センサ３、４がｓｉｎカーブ（正弦曲線）とｃｏｓカーブ（余弦曲線）を出力する。そして、角度演算装置（マイクロコンピュータ）によって、２つのセンサ出力を逆三角関数演算で１８０°間隔の右上がりの直線特性に変換し｛図６（ｂ）参照｝、各右上がりの直線特性を繋ぎ合わせることで、０°〜３６０°の回転角度出力｛図６（ｃ）参照｝が得られる。   When the two members rotate relative to each other, as shown in FIG. 2A, the first and second magnetic sensors 3 and 4 output a sin curve (sine curve) and a cos curve (cosine curve). Then, the angle sensor (microcomputer) converts the output of the two sensors into a straight line characteristic with 180 ° intervals by inverse trigonometric function calculation (see FIG. 6B), and connects the straight line characteristics with each right line. By combining them, a rotation angle output {see FIG. 6C} of 0 ° to 360 ° is obtained.

（従来技術の問題点）
特許文献１に開示される回転角度検出装置はシールド機能を有していない。このため、外部磁場がある環境下においては、外部から与えられる印加磁束が直接、第１、第２磁気センサ３、４のセンサ出力に重畳することになり、外部磁場の影響によって回転角度検出装置の角度検出誤差が大きくなってしまう。
具体的には、図３（ａ）に示すように、第１磁気センサ３の周辺部に軸方向へ向かう外部磁場（図中、上向き矢印Ｘ参照）を所定量（例えば、１０ｍＴ）印加すると、第１磁気センサ３のセンサ出力が印加磁場分（１０ｍＴ）変化してしまう。即ち、図４（ａ）に示すように、第１磁気センサ３のセンサ出力が実線Ａから、外部磁場が与えられたことによって実線Ａ’に変化してしまう。この結果、図４（ｃ）の左側（従来技術のデータ）に示すように、第１磁気センサ３の出力変動量α’が大きくなり、角度検出誤差β’が大きくなってしまう。 (Problems of conventional technology)
The rotation angle detection device disclosed in Patent Document 1 does not have a shield function. For this reason, in an environment with an external magnetic field, an externally applied magnetic flux is directly superimposed on the sensor outputs of the first and second magnetic sensors 3 and 4, and the rotation angle detecting device is affected by the external magnetic field. This increases the angle detection error.
Specifically, as shown in FIG. 3A, when a predetermined amount (for example, 10 mT) of an external magnetic field (see the upward arrow X in the figure) directed in the axial direction is applied to the periphery of the first magnetic sensor 3, The sensor output of the first magnetic sensor 3 changes by the applied magnetic field (10 mT). That is, as shown in FIG. 4A, the sensor output of the first magnetic sensor 3 changes from a solid line A to a solid line A ′ when an external magnetic field is applied. As a result, as shown on the left side of FIG. 4C (prior art data), the output fluctuation amount α ′ of the first magnetic sensor 3 increases, and the angle detection error β ′ increases.

上記の不具合を回避するために、図１（ｂ）に示すように、磁石２の軸方向の一方の面（磁気検出手段とは異なる側の面）に磁性体製のヨーク５を設けて、シールド機能を追加することが考えられる。
しかるに、特許文献１に開示される磁石２の片面にヨーク５を設けると、回転軸に対して垂直方向に着磁された磁石２の磁束の多くがヨーク５を流れることになる。その結果、第１、第２磁気センサ３、４に与えられる磁束が減少し、第１、第２磁気センサ３、４のセンサ出力が小さくなり、結果的にセンサ出力の振幅が小さくなってしまう。 In order to avoid the above problem, as shown in FIG. 1B, a magnetic yoke 5 is provided on one axial surface of the magnet 2 (a surface different from the magnetic detection means). It is possible to add a shield function.
However, when the yoke 5 is provided on one surface of the magnet 2 disclosed in Patent Document 1, most of the magnetic flux of the magnet 2 magnetized in the direction perpendicular to the rotation axis flows through the yoke 5. As a result, the magnetic flux applied to the first and second magnetic sensors 3 and 4 is reduced, the sensor outputs of the first and second magnetic sensors 3 and 4 are reduced, and the amplitude of the sensor output is consequently reduced. .

具体的には、図２（ｂ）に示すように、第１、第２磁気センサ３、４のセンサ出力は、ヨーク５を設けない場合が実線Ａ、Ｂに示す出力振幅であるのに対し、ヨーク５を設けることにより実線Ａ’、Ｂ’に示すように出力振幅が小さくなる。
このように、シールド機能の追加のために磁石２にヨーク５を設けると、センサ出力の振幅が小さくなることで、センサ出力のＳＮ比（歪率）が悪化することになり、角度検出誤差の増大およびロバスト性の悪化を招く。
特開２００３−７５１０８号公報 Specifically, as shown in FIG. 2B, the sensor outputs of the first and second magnetic sensors 3 and 4 are output amplitudes indicated by solid lines A and B when the yoke 5 is not provided. By providing the yoke 5, the output amplitude becomes small as shown by solid lines A ′ and B ′.
As described above, when the yoke 5 is provided in the magnet 2 for the addition of the shield function, the SN ratio (distortion rate) of the sensor output is deteriorated due to a decrease in the amplitude of the sensor output. Increases and deteriorates robustness.
JP 2003-75108 A

本発明は、上記問題点に鑑みてなされたものであり、その目的は、外部磁場の影響を受け難く、且つ磁石から磁気検出手段に与えられる磁束密度の増加を図ることのできる回転角度検出装置の提供にある。   The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a rotation angle detection device that is not easily affected by an external magnetic field and that can increase the magnetic flux density applied from the magnet to the magnetic detection means. Is in the provision of.

［請求項１の手段］
回転角度検出装置の磁石は、磁気検出手段が配置される面とは逆の面に磁性体製のヨークを備える。このため、磁石の反磁気検出手段側から外部磁場が与えられても、外部磁場がヨークで遮断されるため、磁気検出手段は外部磁場の影響を受け難い。
また、磁石は、軸方向に磁力線が向くように軸方向着磁されて、軸方向へ磁力線を生じさせるものであるため、磁石の反磁気検出手段側に設けたヨークによって、磁石の反磁気検出手段側の磁気効率が高められ、磁石の磁気損失が小さく抑えられる。この結果、従来技術とは逆に、ヨークを設けたことにより、磁気検出手段に与えられる磁束密度が増加する。このように、磁気検出手段に与えられる磁束密度が増加することにより、角度検出誤差を抑えることが可能となるとともに、ロバスト性が向上する。
即ち、請求項１の回転角度検出装置は、外部磁場の影響を受け難く、且つ回転角度の検出性能を高めることができる。 [Means of claim 1]
The magnet of the rotation angle detection device includes a yoke made of a magnetic material on the surface opposite to the surface on which the magnetic detection means is arranged. For this reason, even if an external magnetic field is applied from the diamagnetic detection means side of the magnet, the external magnetic field is blocked by the yoke, so that the magnetic detection means is hardly affected by the external magnetic field.
In addition, since the magnet is magnetized in the axial direction so that the magnetic field lines are directed in the axial direction, the magnetic field lines are generated in the axial direction. The magnetic efficiency on the means side is increased, and the magnetic loss of the magnet is kept small. As a result, contrary to the prior art, the provision of the yoke increases the magnetic flux density applied to the magnetic detection means. As described above, by increasing the magnetic flux density applied to the magnetic detection means, it becomes possible to suppress the angle detection error and improve the robustness.
In other words, the rotation angle detection device according to the first aspect is hardly affected by the external magnetic field and can improve the rotation angle detection performance.

［請求項２の手段］
ヨークは、磁石の反磁気検出手段側の全面を覆うものである。
このため、磁石の反磁気検出手段側から与えられる外部磁場が、ヨークによって確実に遮断される。 [Means of claim 2]
The yoke covers the entire surface of the magnet on the diamagnetic detection means side.
For this reason, the external magnetic field given from the diamagnetism detecting means side of the magnet is surely cut off by the yoke.

［請求項３の手段］
磁気検出手段は、磁気変化を検出する第１磁気センサと、第１磁気センサに対して９０°位相のズレた磁気変化を検出する第２磁気センサとを具備するものであり、回転角度検出装置は、第１、第２磁気センサの検出した磁気変化により、相対回転する２つの部材（一方および他方）の相対回転角度を求めるものである。
このように、位相が９０°ズレた第１、第２磁気センサを用いることにより、回転角度検出装置の検出する回転角度の範囲を広くすることができる。即ち、検出範囲を広くすることができる。 [Means of claim 3]
The magnetic detection means includes a first magnetic sensor that detects a magnetic change, and a second magnetic sensor that detects a magnetic change that is 90 ° out of phase with the first magnetic sensor. Is to obtain the relative rotation angle of two members (one and the other) that rotate relative to each other based on the magnetic change detected by the first and second magnetic sensors.
Thus, by using the first and second magnetic sensors whose phases are shifted by 90 °, the range of the rotation angle detected by the rotation angle detection device can be widened. That is, the detection range can be widened.

［請求項４の手段］
回転角度検出装置は、磁石と軸方向に隙間を隔て対向配置されるとともに、磁石との対向面が磁石と逆磁極で、磁石と一体に回転する第２磁石を備えるものであり、磁気検出手段は、磁石と第２磁石との軸方向の間に配置されるものである。
これにより、磁石と第２磁石の間の磁束密度が高まり、磁気検出手段に与えられる磁束密度が増加する。そして、磁気検出手段に与えられる磁束密度が増加することにより、角度検出誤差を抑えることが可能となるとともに、ロバスト性が向上する。 [Means of claim 4]
The rotation angle detection device includes a second magnet that is disposed opposite to the magnet with a gap in the axial direction, and that has a surface facing the magnet that is opposite to the magnet and rotates integrally with the magnet. Are arranged between the magnet and the second magnet in the axial direction.
Thereby, the magnetic flux density between a magnet and a 2nd magnet increases, and the magnetic flux density given to a magnetic detection means increases. Further, an increase in the magnetic flux density applied to the magnetic detection means makes it possible to suppress angle detection errors and improve robustness.

［請求項５の手段］
第２磁石は、磁気検出手段が配置される面とは逆の面に磁性体製の第２ヨークを備える。このため、第２磁石の反磁気検出手段側から外部磁場が与えられても、外部磁場が第２ヨークで遮断されるため、磁気検出手段は外部磁場の影響を受け難い。
また、第２磁石は、軸方向に磁力線が向くように軸方向着磁されるものであるため、第２ヨークによって、第２磁石の反磁気検出手段側の磁気効率が高められ、第２磁石の磁気損失が小さく抑えられる。これにより、磁気検出手段の配置部位における磁束密度を更に高めることができる。
即ち、請求項５の手段は、外部磁場の影響を極めて小さくすることができるとともに、磁気検出手段に与えられる磁束密度が大きく増加することになり、角度検出誤差を抑えることが可能となるとともに、ロバスト性が向上する。 [Means of claim 5]
The second magnet includes a second yoke made of a magnetic material on a surface opposite to the surface on which the magnetic detection means is disposed. For this reason, even if an external magnetic field is applied from the diamagnetic detection means side of the second magnet, the external magnetic field is blocked by the second yoke, so that the magnetic detection means is hardly affected by the external magnetic field.
Further, since the second magnet is magnetized in the axial direction so that the magnetic lines of force are directed in the axial direction, the second yoke increases the magnetic efficiency of the second magnet on the diamagnetic detection means side, and the second magnet The magnetic loss can be kept small. Thereby, the magnetic flux density in the arrangement | positioning site | part of a magnetic detection means can be raised further.
That is, the means of claim 5 can extremely reduce the influence of the external magnetic field, greatly increases the magnetic flux density applied to the magnetic detection means, and can suppress the angle detection error. Robustness is improved.

［請求項６の手段］
磁石は、回転軸に対して垂直方向に平面を成す円盤形状を呈し、磁気検出手段に対して磁石が１回転することにより、磁気検出手段に１つのサイン曲線磁場を与えるものである。 [Means of claim 6]
The magnet has a disk shape that forms a plane in a direction perpendicular to the rotation axis, and gives one sine curve magnetic field to the magnetic detection means when the magnet rotates once with respect to the magnetic detection means.

最良の形態の回転角度検出装置は、相対回転する一方に設けられた磁石（例えば、回転軸に対して垂直な平面を有する円盤形状の永久磁石）と、相対回転する他方に設けられ、磁石から与えられる磁気変化を検出する磁気検出手段（例えば、回転に対して出力差が生じる２つのセンサ、第１、第２ホールＩＣ等）とを具備し、相対回転する一方および他方の相対回転角度を、磁気検出手段の検出した磁気変化により求める。
磁気検出手段は、磁石の軸方向に配置される。
また、磁石は、軸方向に磁力線が向くように軸方向着磁され、磁気検出手段に対する回転軌跡上にサイン曲線磁場を発生する。
さらに、磁石は、磁気検出手段とは軸方向に異なる面に、磁性体製のヨーク（例えば、磁石と同径の円盤形状）を備えるものである。 The rotation angle detection device of the best mode is provided with a magnet (for example, a disk-shaped permanent magnet having a plane perpendicular to the rotation axis) provided on one side that rotates relative to the other and a magnet provided on the other side that rotates relative to the magnet. Magnetic detection means for detecting a given magnetic change (for example, two sensors that generate an output difference with respect to rotation, the first and second Hall ICs, etc.), and the relative rotational angle of one and the other of the relative rotation The magnetic change detected by the magnetic detection means is obtained.
The magnetic detection means is arranged in the axial direction of the magnet.
Further, the magnet is axially magnetized so that the magnetic lines of force are directed in the axial direction, and generates a sine curve magnetic field on the rotation locus with respect to the magnetic detection means.
Further, the magnet is provided with a magnetic yoke (for example, a disk shape having the same diameter as the magnet) on a surface different from the magnetic detection means in the axial direction.

実施例１を図１〜図６を参照して説明する。
（実施例１の構成）
この実施例１に示す回転角度検出装置は、回転センサ部｛図１（ｃ）、（ｃ’）参照｝と、角度演算装置（図５参照）とを備える。 A first embodiment will be described with reference to FIGS.
(Configuration of Example 1)
The rotation angle detection device shown in the first embodiment includes a rotation sensor unit {see FIGS. 1C and 1C ′} and an angle calculation device (see FIG. 5).

回転センサ部は、シャフト１（相対回転する一方の部材：この実施例では回転部材）と、シャフト１に固定された磁石２と、図示しない固定部材（相対回転する他方の部材：例えば、ハウジングに固定された回路基板等）に搭載された磁気検出手段（第１、第２磁気センサ３、４）とを備える。
シャフト１は、磁性体製あるいは非磁性体製で円柱棒状を呈するものであり、例えばスロットル開度センサにおいては、スロットルバルブ（角度検出の対象物）と一体に回転するものである。 The rotation sensor unit includes a shaft 1 (one member that rotates relative to the rotating member in this embodiment), a magnet 2 that is fixed to the shaft 1, and a fixing member that is not shown (the other member that rotates relative to the other member: for example, a housing. And magnetic detection means (first and second magnetic sensors 3, 4) mounted on a fixed circuit board or the like.
The shaft 1 is made of a magnetic material or a non-magnetic material and has a cylindrical bar shape. For example, in a throttle opening sensor, the shaft 1 rotates integrally with a throttle valve (an object for angle detection).

磁石２は、シャフト１に固定されて、シャフト１と一体に回転する。
磁石２は、一定の厚みを有し、リング状もしくは円盤状を呈する永久磁石であり、その外周縁の軸心とシャフト１の軸心とが一致する。
この磁石２は、シャフト１の回転軸方向（以下、軸方向と称す）に磁力線が向くように軸方向着磁されたものであり、軸方向から見た第１、第２磁気センサ３、４の回転軌跡上にサイン曲線磁場を発生する。即ち、磁石２は、１回転することで、第１、第２磁気センサ３、４に１つのサイン曲線の磁束変化を与えるように軸方向の着磁が調整されたものである。 The magnet 2 is fixed to the shaft 1 and rotates integrally with the shaft 1.
The magnet 2 is a permanent magnet having a constant thickness and having a ring shape or a disk shape, and the axis of the outer peripheral edge thereof coincides with the axis of the shaft 1.
This magnet 2 is magnetized in the axial direction so that the lines of magnetic force are directed in the direction of the rotation axis of the shaft 1 (hereinafter referred to as the axial direction), and the first and second magnetic sensors 3 and 4 viewed from the axial direction. A sine curve magnetic field is generated on the rotation trajectory. That is, the magnet 2 is adjusted in the axial magnetization so as to give the first and second magnetic sensors 3 and 4 a magnetic flux change of one sine curve by one rotation.

また、磁石２は、磁気検出手段とは異なる面｛図１（ｃ）の下面｝にヨーク５を備える。このヨーク５は、磁石２の反磁気検出手段側｛磁気検出手段とは異なる面：図１（ｃ）の下面｝の全面を覆う磁性体製である。ヨーク５は、外周径が磁石２と同径で、一定の厚みを有し、その外周縁の軸心とシャフト１の軸心とが一致した状態で、磁石２またはシャフト１の少なくとも一方に固定されている。   The magnet 2 includes a yoke 5 on a surface different from that of the magnetic detection means {the lower surface in FIG. 1C}. The yoke 5 is made of a magnetic material that covers the entire surface of the magnet 2 on the diamagnetic detection means side {surface different from the magnetic detection means: the lower surface in FIG. 1 (c)}. The yoke 5 is fixed to at least one of the magnet 2 and the shaft 1 in a state in which the outer peripheral diameter is the same as the magnet 2 and has a constant thickness, and the axial center of the outer peripheral edge coincides with the axial center of the shaft 1. Has been.

磁気検出手段は、磁石２の軸方向｛図１（ｃ）の上側｝に配置され、磁石２から与えられる磁束変化を検出する第１磁気センサ３と、第１磁気センサ３に対して９０°位相のズレた磁束変化を検出する第２磁気センサ４とからなる。
第１磁気センサ３は、固定部材（例えば、ハウジングに固定された回路基板等）に固定されたものであり、磁石２の軸方向で、且つ磁石２の外周端とシャフト１の外周端との間の略中央部に配置され、磁気検出面を通過する磁束の流れ方向および磁束密度に応じた出力を発生する第１ホール素子３ａ（図５参照）を内蔵している。ここで、第１ホール素子３ａは、微弱なセンサ出力を発生するものであるため、その微弱出力を増幅する第１増幅アンプ６が接続される。この第１増幅アンプ６は、第１磁気センサ３内に封入したものであっても良いし、第１磁気センサ３とは別の基板上に配置したものであっても良い。 The magnetic detection means is disposed in the axial direction of the magnet 2 (upper side in FIG. 1C), detects the magnetic flux change applied from the magnet 2, and is 90 ° with respect to the first magnetic sensor 3. And a second magnetic sensor 4 for detecting a change in magnetic flux with a phase shift.
The first magnetic sensor 3 is fixed to a fixing member (for example, a circuit board fixed to the housing), and is in the axial direction of the magnet 2 and between the outer peripheral end of the magnet 2 and the outer peripheral end of the shaft 1. The first Hall element 3a (see FIG. 5) is disposed in a substantially central portion between the two and generates an output corresponding to the flow direction and magnetic flux density of the magnetic flux passing through the magnetic detection surface. Here, since the first Hall element 3a generates a weak sensor output, a first amplification amplifier 6 for amplifying the weak output is connected. The first amplification amplifier 6 may be one enclosed in the first magnetic sensor 3 or may be arranged on a different substrate from the first magnetic sensor 3.

第２磁気センサ４は、第１磁気センサ３と同様、固定部材（例えば、ハウジングに固定された回路基板等）に固定されたものであり、磁石２の軸方向で、且つ磁石２の外周端とシャフト１の外周端との間の略中央部に配置され、磁気検出面を通過する磁束の流れ方向および磁束密度に応じた出力を発生する第２ホール素子４ａ（図５参照）を内蔵している。ここで、第２ホール素子４ａは、微弱なセンサ出力を発生するものであるため、その微弱出力を増幅する第２増幅アンプ７が接続される。この第２増幅アンプ７は、第２磁気センサ４内に封入したものであっても良いし、第２磁気センサ４とは別の基板上に配置したものであっても良い。
なお、第１、第２磁気センサ３、４は、磁石２に対する回転軌跡が同一であるとともに、磁石２に対する対向距離も同一に配置されている。 Similar to the first magnetic sensor 3, the second magnetic sensor 4 is fixed to a fixing member (for example, a circuit board fixed to the housing), and is in the axial direction of the magnet 2 and the outer peripheral end of the magnet 2. And a second Hall element 4a (see FIG. 5) which is disposed at a substantially central portion between the outer periphery of the shaft 1 and generates an output in accordance with the flow direction and magnetic flux density of the magnetic flux passing through the magnetic detection surface. ing. Here, since the second Hall element 4a generates a weak sensor output, a second amplification amplifier 7 for amplifying the weak output is connected. The second amplification amplifier 7 may be one enclosed in the second magnetic sensor 4 or may be arranged on a different substrate from the second magnetic sensor 4.
Note that the first and second magnetic sensors 3 and 4 have the same rotation trajectory with respect to the magnet 2 and the same facing distance to the magnet 2.

第１、第２磁気センサ３、４は、ともに軸方向の磁気変化を検出するように、それぞれの磁気検出面が軸方向に向いて配置されるものであり、第２磁気センサ４が第１磁気センサ３に対して回転方向に９０°異なった位置に配置されるものである。
これによって、第１磁気センサ３に与えられる磁束線に対して、第２磁気センサ４に与えられる磁束線の位相が９０°ズレることになる。この結果、第１磁気センサ３のセンサ出力に対して、第２磁気センサ４のセンサ出力の位相が９０°ズレることになり、図６（ａ）に示すように、磁石２の回転に対して第１磁気センサ３がｃｏｓカーブのセンサ出力（図中、実線Ａ）を発生し、第２磁気センサ４がｓｉｎカーブのセンサ出力（図中、実線Ｂ）を発生する。 Each of the first and second magnetic sensors 3 and 4 is arranged such that each magnetic detection surface faces the axial direction so as to detect a magnetic change in the axial direction, and the second magnetic sensor 4 is the first magnetic sensor 4. The magnetic sensor 3 is arranged at a position different by 90 ° in the rotation direction.
As a result, the phase of the magnetic flux lines applied to the second magnetic sensor 4 is shifted by 90 ° with respect to the magnetic flux lines applied to the first magnetic sensor 3. As a result, the phase of the sensor output of the second magnetic sensor 4 is shifted by 90 ° from the sensor output of the first magnetic sensor 3, and as shown in FIG. The first magnetic sensor 3 generates a cos curve sensor output (solid line A in the figure), and the second magnetic sensor 4 generates a sin curve sensor output (solid line B in the figure).

角度演算装置１０は、周知構成のマイクロコンピュータであり、図５に示すように、第１磁気センサ３のセンサ出力を第１ＡＤＣ８でデジタル変換して入力するとともに、第２磁気センサ４のセンサ出力を第２ＡＤＣ９でデジタル変換して入力する。
角度演算装置１０は、第１、第２磁気センサ３、４の出力から角度演算をするものであり、図６（ａ）に示すように、第１磁気センサ３のｃｏｓカーブ出力と、第２磁気センサ４のｓｉｎカーブ出力とを、図６（ｂ）に示すように、逆三角関数演算で１８０°間隔の右上がりの直線特性Ｃに変換｛ｔａｎθ＝ｓｉｎθ／ｃｏｓθ→θ＝ｔａｎ-1（ｓｉｎθ／ｃｏｓθ）｝する。そして、角度演算装置１０は、図６（ｃ）に示すように、各右上がりの直線特性Ｃを繋ぎ合わせ、磁石２の回転０°〜３６０°に対応した回転角度出力Ｄ（アナログ信号）を発生するものである。 The angle calculation device 10 is a microcomputer having a well-known configuration. As shown in FIG. 5, the sensor output of the first magnetic sensor 3 is digitally converted by the first ADC 8 and input, and the sensor output of the second magnetic sensor 4 is input. The second ADC 9 performs digital conversion and inputs.
The angle calculation device 10 calculates an angle from the outputs of the first and second magnetic sensors 3 and 4, and as shown in FIG. 6A, the cos curve output of the first magnetic sensor 3 and the second As shown in FIG. 6B, the sin curve output of the magnetic sensor 4 is converted into a linear characteristic C that rises to the right at 180 ° intervals by inverse trigonometric function calculation {tan θ = sin θ / cos θ → θ = tan −1 ( sin θ / cos θ)}. Then, as shown in FIG. 6 (c), the angle calculation device 10 connects the linear characteristics C that rise to the right, and outputs a rotation angle output D (analog signal) corresponding to the rotation 0 ° to 360 ° of the magnet 2. It is what happens.

（実施例１の効果１）
実施例１の回転角度検出装置は、上述したように、磁石２が軸方向着磁されて、軸方向へ磁力線を生じさせる。このため、磁石２の反磁気検出手段側｛磁気検出手段とは軸方向に異なる面：図１（ｃ）の下面｝に設けたヨーク５によって、磁石２の反磁気検出手段側の磁気効率が高められる。これによって、第１、第２磁気センサ３、４側の磁力も強められ、磁石２から第１、第２磁気センサ３、４に与えられる磁束密度が高まる。 (Effect 1 of Example 1)
As described above, in the rotation angle detection device according to the first embodiment, the magnet 2 is magnetized in the axial direction, and lines of magnetic force are generated in the axial direction. For this reason, the magnetic efficiency of the magnet 2 on the diamagnetism detection means side of the magnet 2 is improved by the yoke 5 provided on the diamagnetism detection means side of the magnet 2 (a surface different from the magnetic detection means in the axial direction: the lower surface in FIG. 1C). Enhanced. Thereby, the magnetic force on the first and second magnetic sensors 3 and 4 side is also increased, and the magnetic flux density applied from the magnet 2 to the first and second magnetic sensors 3 and 4 is increased.

具体的には、図２（ｃ）に示すように、第１、第２磁気センサ３、４のセンサ出力は、ヨーク５を設けない場合が実線Ａ、Ｂに示す出力振幅であるのに対し、ヨーク５を設けることにより磁石２の磁気効率が高まることで、実線Ａ’、Ｂ’に示すように出力振幅が大きくなる。即ち、従来技術では、ヨーク５を設けることでセンサ出力が小さくなったのに対し、本実施例では、ヨーク５を設けたことでセンサ出力を大きくできる。
このように、磁石２にヨーク５を設けることで、センサ出力の振幅を大きくできるため、センサ出力のＳＮ比（歪率）を向上させることができ、結果的に角度検出誤差を小さく抑えることができるとともに、ロバスト性の向上を図ることができる。 Specifically, as shown in FIG. 2C, the sensor outputs of the first and second magnetic sensors 3 and 4 are output amplitudes indicated by solid lines A and B when the yoke 5 is not provided. By providing the yoke 5, the magnetic efficiency of the magnet 2 is increased, and the output amplitude is increased as shown by the solid lines A ′ and B ′. That is, in the prior art, the sensor output is reduced by providing the yoke 5, whereas in the present embodiment, the sensor output can be increased by providing the yoke 5.
Thus, by providing the magnet 5 with the yoke 5, the amplitude of the sensor output can be increased, so that the SN ratio (distortion rate) of the sensor output can be improved, and as a result, the angle detection error can be kept small. In addition, the robustness can be improved.

（実施例１の効果２）
実施例１の回転角度検出装置は、上述したように、ヨーク５が磁石２の反磁気検出手段側の全面を覆って、磁石２の反磁気検出手段側で磁気シールドの機能を果たす。このため、磁石２の反磁気検出手段側から外部磁場が与えられても、外部磁場はヨーク５で遮断されて第１、第２磁気センサ３、４に到達する不具合が防がれ、外部磁場による角度検出誤差の発生を抑えることができる。
具体的には、図３（ｂ）に示すように、第１磁気センサ３の周辺部に軸方向へ向かう外部磁場（図中、上向き矢印Ｘ参照）を所定量（例えば、１０ｍＴ）印加しても、図４（ｂ）の実線Ａに示すように、第１磁気センサ３のセンサ出力が印加磁場によって変化する不具合が生じない。
この結果、図３（ｂ）に示すように外部磁場を与えても、図４（ｃ）の右側（実施例のデータ）に示すように、第１磁気センサ３の出力変動量αが極めて小さく抑えられ、角度検出誤差βを小さく抑えることができる。 (Effect 2 of Example 1)
In the rotation angle detection device of the first embodiment, as described above, the yoke 5 covers the entire surface of the magnet 2 on the diamagnetism detection means side, and functions as a magnetic shield on the diamagnetism detection means side of the magnet 2. For this reason, even if an external magnetic field is applied from the diamagnetic detection means side of the magnet 2, the external magnetic field is blocked by the yoke 5, and the problem of reaching the first and second magnetic sensors 3 and 4 is prevented. It is possible to suppress the occurrence of an angle detection error due to.
Specifically, as shown in FIG. 3B, a predetermined amount (for example, 10 mT) of an external magnetic field (see the upward arrow X in the figure) directed in the axial direction is applied to the periphery of the first magnetic sensor 3. However, as indicated by the solid line A in FIG. 4B, there is no problem that the sensor output of the first magnetic sensor 3 changes depending on the applied magnetic field.
As a result, even when an external magnetic field is applied as shown in FIG. 3B, the output fluctuation amount α of the first magnetic sensor 3 is extremely small as shown on the right side of FIG. And the angle detection error β can be reduced.

実施例２を図７を参照して説明する。
実施例２の回転角度検出装置は、図７（ａ）に示すように、磁気検出手段（第１、第２磁気センサ３、４）の反磁石２側に第２磁石１１を設けたものであり、他の構成は実施例１と同じである。
この第２磁石１１は、磁石２と軸方向に隙間を隔てて対向配置されたものであり、磁石２との対向面が、磁石２と逆磁極を成して磁石２と一体に回転する。 A second embodiment will be described with reference to FIG.
As shown in FIG. 7A, the rotation angle detection device of the second embodiment is provided with a second magnet 11 on the side opposite to the magnet 2 of the magnetic detection means (first and second magnetic sensors 3, 4). In other respects, the configuration is the same as that of the first embodiment.
The second magnet 11 is disposed opposite to the magnet 2 with a gap in the axial direction, and the surface facing the magnet 2 forms a reverse magnetic pole with the magnet 2 and rotates integrally with the magnet 2.

具体的に第２磁石１１は、一定の厚みを有し、磁石２と略同径寸法のリング状もしくは円盤状を呈する永久磁石であり、その外周縁の軸心とシャフト１の軸心とが一致する。
この第２磁石１１は、軸方向に対して垂直方向の一方から他方に向けて磁力線が向くように径方向着磁されたものであり、磁石２と第２磁石１１の対向面が逆磁極を成すようにシャフト１に固定されて、磁石２と一体に回転する。
一方、第１、第２磁気センサ３、４は、磁石２と第２磁石１１の軸方向間の略中央部で、且つ磁石２および第２磁石１１の外周端と、シャフト１の外周端との間の略中央部に配置される。 Specifically, the second magnet 11 is a permanent magnet having a constant thickness and having a ring shape or a disk shape having substantially the same diameter as the magnet 2, and the axis of the outer peripheral edge and the axis of the shaft 1 are arranged. Match.
The second magnet 11 is magnetized in the radial direction so that the lines of magnetic force are directed from one to the other in the direction perpendicular to the axial direction, and the opposing surface of the magnet 2 and the second magnet 11 has a reverse magnetic pole. It is fixed to the shaft 1 to be formed and rotates integrally with the magnet 2.
On the other hand, the first and second magnetic sensors 3 and 4 are substantially central portions between the axial directions of the magnet 2 and the second magnet 11, and the outer peripheral ends of the magnet 2 and the second magnet 11, and the outer peripheral end of the shaft 1. It is arrange | positioned in the approximate center part between.

（実施例２の効果）
このように、実施例２の回転角度検出装置は、磁石２と第２磁石１１が対向面において逆磁極を成すため、第１、第２磁気センサ３、４が配置される空間において、磁石２と第２磁石１１が互いに磁気吸引を行う閉磁場が形成される。即ち、第１、第２磁気センサ３、４の配置空間において、磁石２の放出する磁力線が第２磁石１１で磁気吸引され、第２磁石１１の放出する磁力線が磁石２で磁気吸引される。 (Effect of Example 2)
As described above, in the rotation angle detection device according to the second embodiment, since the magnet 2 and the second magnet 11 form opposite magnetic poles on the opposing surfaces, the magnet 2 is disposed in the space where the first and second magnetic sensors 3 and 4 are disposed. A closed magnetic field in which the second magnet 11 and the second magnet 11 perform magnetic attraction is formed. That is, in the arrangement space of the first and second magnetic sensors 3 and 4, the magnetic lines of force emitted by the magnet 2 are magnetically attracted by the second magnet 11, and the magnetic lines of force emitted by the second magnet 11 are magnetically attracted by the magnet 2.

これにより、上記実施例１の効果に加えて、磁石２と第２磁石１１の間の磁束密度がさらに高められ、結果的に第１、第２磁気センサ３、４に与えられる磁束密度を高めることができる。
具体的には、図７（ｂ）に示すように、第１、第２磁気センサ３、４のセンサ出力の振幅を、実線Ａ、Ｂに示すように、実施例１｛図４（ｂ）参照｝より大きくすることができる。
このように、第２磁石１１をを設けることで、センサ出力の振幅を大きくできるため、センサ出力のＳＮ比（歪率）を実施例１よりさらに向上させることができ、結果的に角度検出誤差を小さく抑えることができるとともに、ロバスト性の向上を図ることができる。 Thereby, in addition to the effect of the first embodiment, the magnetic flux density between the magnet 2 and the second magnet 11 is further increased, and as a result, the magnetic flux density applied to the first and second magnetic sensors 3 and 4 is increased. be able to.
Specifically, as shown in FIG. 7B, the amplitudes of the sensor outputs of the first and second magnetic sensors 3 and 4 are as shown in solid lines A and B in Example 1 {FIG. 4B. Reference} can be larger.
As described above, since the amplitude of the sensor output can be increased by providing the second magnet 11, the SN ratio (distortion rate) of the sensor output can be further improved as compared with the first embodiment, resulting in an angle detection error. Can be suppressed, and robustness can be improved.

実施例３を図８を参照して説明する。
実施例３の回転角度検出装置は、図８（ａ）に示すように、磁気検出手段（第１、第２磁気センサ３、４）の反磁石２側に第２ヨーク１２を備えた第２磁石１１を設けたものであり、他の構成は実施例１と同じである。
この実施例３における第２磁石１１および第２ヨーク１２は、実施例１で示した磁石２およびヨーク５と同じものである。 A third embodiment will be described with reference to FIG.
As shown in FIG. 8A, the rotation angle detection device of the third embodiment is a second that includes a second yoke 12 on the side opposite to the magnet 2 of the magnetic detection means (first and second magnetic sensors 3 and 4). A magnet 11 is provided, and the other configuration is the same as that of the first embodiment.
The second magnet 11 and the second yoke 12 in the third embodiment are the same as the magnet 2 and the yoke 5 shown in the first embodiment.

具体的に第２磁石１１は、軸方向に磁力線が向くように軸方向着磁されたものであり、軸方向から見た第１、第２磁気センサ３、４の回転軌跡上にサイン曲線磁場を発生し、第２磁石１１が１回転することで、第１、第２磁気センサ３、４にサイン曲線の磁束変化を与えるように軸方向の着磁が調整されたものである。そして、第２磁石１１は、磁石２と第２磁石１１の対向面が逆磁極を成すようにシャフト１に固定されて、磁石２と一体に回転する。
第２ヨーク１２は、第２磁石１１の反磁気検出手段側の面｛図８（ａ）の上面｝に装着された磁性体製の円盤であり、第２磁石１１の反磁気検出手段側の全面を覆うように第２磁石１１またはシャフト１の少なくとも一方に固定されている。 Specifically, the second magnet 11 is magnetized in the axial direction so that the magnetic lines of force are directed in the axial direction, and a sine curve magnetic field on the rotation trajectory of the first and second magnetic sensors 3 and 4 viewed from the axial direction. Is generated, and the second magnet 11 is rotated once to adjust the magnetization in the axial direction so as to give the first and second magnetic sensors 3 and 4 magnetic flux changes of a sine curve. And the 2nd magnet 11 is fixed to the shaft 1 so that the opposing surface of the magnet 2 and the 2nd magnet 11 may form a reverse magnetic pole, and rotates integrally with the magnet 2. As shown in FIG.
The second yoke 12 is a disk made of a magnetic material attached to the surface of the second magnet 11 on the side of the diamagnetic detection means {the upper surface of FIG. 8A). It is fixed to at least one of the second magnet 11 or the shaft 1 so as to cover the entire surface.

（実施例３の効果１）
実施例３の回転角度検出装置は、磁石２と同様、第２磁石１１が軸方向着磁されて、軸方向へ磁力線を生じさせる。このため、第２磁石１１の反磁気検出手段側に設けた第２ヨーク１２によって、第２磁石１１の反磁気検出手段側の磁気効率が高められる。これによって、第１、第２磁気センサ３、４側の磁力も強められ、第２磁石１１から第１、第２磁気センサ３、４に与えられる磁束密度が高まる。
そして、上記実施例２と同様に、磁石２と第２磁石１１が対向面において逆磁極を成すため、第１、第２磁気センサ３、４が配置される空間において、磁石２と第２磁石１１が互いに磁気吸引を行う磁束方向が軸方向に略均一に揃った閉磁場が形成される。即ち、第１、第２磁気センサ３、４の配置空間において、磁石２の放出する磁力線が第２磁石１１で磁気吸引され、第２磁石１１の放出する磁力線が磁石２で磁気吸引される。 (Effect 1 of Example 3)
In the rotation angle detection device according to the third embodiment, like the magnet 2, the second magnet 11 is magnetized in the axial direction to generate lines of magnetic force in the axial direction. For this reason, the magnetic efficiency of the second magnet 11 on the diamagnetic detection means side is enhanced by the second yoke 12 provided on the diamagnetism detection means side of the second magnet 11. Accordingly, the magnetic force on the first and second magnetic sensors 3 and 4 side is also increased, and the magnetic flux density applied from the second magnet 11 to the first and second magnetic sensors 3 and 4 is increased.
Since the magnet 2 and the second magnet 11 form opposite magnetic poles on the opposing surfaces in the same manner as in the second embodiment, the magnet 2 and the second magnet are disposed in the space where the first and second magnetic sensors 3 and 4 are disposed. A closed magnetic field is formed in which the magnetic flux directions in which the magnetic fluxes 11 magnetically attract each other are substantially uniform in the axial direction. That is, in the arrangement space of the first and second magnetic sensors 3 and 4, the magnetic lines of force emitted by the magnet 2 are magnetically attracted by the second magnet 11, and the magnetic lines of force emitted by the second magnet 11 are magnetically attracted by the magnet 2.

これにより、磁石２と第２磁石１１の間の磁束密度を倍増することができ、結果的に第１、第２磁気センサ３、４に与えられる磁束密度を大きく高めることができる。
具体的には、図８（ｂ）に示すように、第１、第２磁気センサ３、４のセンサ出力の振幅を、実線Ａ、Ｂに示すように、実施例１｛図４（ｂ）参照｝の約２倍に大きくするこができる。
このように、第２ヨーク１２を備えた軸方向着磁の第２磁石１１を設けることで、センサ出力の振幅を大きくできるため、センサ出力のＳＮ比（歪率）を実施例１よりさらに向上させることができ、結果的に角度検出誤差を小さく抑えることができるとともに、ロバスト性の向上を図ることができる。 Thereby, the magnetic flux density between the magnet 2 and the second magnet 11 can be doubled, and as a result, the magnetic flux density given to the first and second magnetic sensors 3 and 4 can be greatly increased.
Specifically, as shown in FIG. 8B, the amplitudes of the sensor outputs of the first and second magnetic sensors 3 and 4 are as shown in solid lines A and B in Example 1 {FIG. 4B. About twice as large as the reference}.
Thus, by providing the axially magnetized second magnet 11 provided with the second yoke 12, the amplitude of the sensor output can be increased, so that the SN ratio (distortion rate) of the sensor output is further improved than in the first embodiment. As a result, the angle detection error can be kept small, and robustness can be improved.

（実施例３の効果２）
実施例３の回転角度検出装置は、ヨーク５が磁石２の反磁気検出手段側の全面を覆って、磁石２の反磁気検出手段側で磁気シールドの機能を果たす実施例１の効果に加え、第２ヨーク１２が第２磁石１１の反磁気検出手段側の全面を覆って、第２磁石１１の反磁気検出手段側で磁気シールドの機能を果たす。
このため、軸方向の両側から外部磁場（図中、矢印Ｘ、Ｙ参照）が与えられても、外部磁場はヨーク５および第２ヨーク１２で遮断されて第１、第２磁気センサ３、４に到達する不具合が防がれ、外部磁場による角度検出誤差の発生を抑えることができる。 (Effect 2 of Example 3)
In addition to the effect of the first embodiment in which the yoke 5 covers the entire surface of the magnet 2 on the diamagnetic detection means side and functions as a magnetic shield on the diamagnetic detection means side of the magnet 2, The second yoke 12 covers the entire surface of the second magnet 11 on the side of the diamagnetic detection means, and functions as a magnetic shield on the side of the diamagnetic detection means of the second magnet 11.
For this reason, even if an external magnetic field (see arrows X and Y in the figure) is applied from both sides in the axial direction, the external magnetic field is blocked by the yoke 5 and the second yoke 12, and the first and second magnetic sensors 3, 4 Can be prevented, and the occurrence of an angle detection error due to an external magnetic field can be suppressed.

実施例４を図９を参照して説明する。
実施例４の回転角度検出装置は、実施例３の発展形であり、磁石２と第２磁石１１の外周全面をヨーク５と第２ヨーク１２でそれぞれ覆ったものである。
このように、磁石２および第２磁石１１の外周全面も、ヨーク５と第２ヨーク１２で磁気シールドを行うことにより、軸方向の他に、径方向から外部磁場が与えられても、外部磁場がヨーク５および第２ヨーク１２で遮断されて第１、第２磁気センサ３、４に到達する不具合が防がれる。これにより、軸方向の外部磁場に加え、径方向の外部磁場による角度検出誤差の発生を抑えることができる。 A fourth embodiment will be described with reference to FIG.
The rotation angle detection device according to the fourth embodiment is a development of the third embodiment, and covers the entire outer surfaces of the magnet 2 and the second magnet 11 with the yoke 5 and the second yoke 12, respectively.
In this way, the entire outer periphery of the magnet 2 and the second magnet 11 is also shielded by the yoke 5 and the second yoke 12, so that an external magnetic field can be applied even if an external magnetic field is applied from the radial direction in addition to the axial direction. Is blocked by the yoke 5 and the second yoke 12 to prevent the first and second magnetic sensors 3 and 4 from being reached. Thereby, in addition to the external magnetic field of an axial direction, generation | occurrence | production of the angle detection error by the external magnetic field of a radial direction can be suppressed.

〔変形例〕
上記の実施例では、第１、第２磁気センサ３、４を固定し、磁石２を回転させた例を示したが、逆に磁石２を固定し、第１、第２磁気センサ３、４を回転させる構造を採用しても良い。また、磁石２と第１、第２磁気センサ３、４の双方が共に回転する構造を採用しても良い。
上記の実施例では、第１、第２磁気センサ３、４の一例としてホール素子を用いたが、磁気抵抗素子（ＭＲＥ）など、他の磁気センサを用いても良い。
上記の実施例では、磁気検出手段の一例として、２つの磁気センサ（第１、第２磁気センサ３、４）を用いたが、１つの磁気センサで所定角度内の回転角度を検出するようにしても良い。 [Modification]
In the above embodiment, the first and second magnetic sensors 3 and 4 are fixed and the magnet 2 is rotated, but conversely the magnet 2 is fixed and the first and second magnetic sensors 3 and 4 are fixed. You may employ | adopt the structure which rotates. Moreover, you may employ | adopt the structure where both the magnet 2 and the 1st, 2nd magnetic sensors 3 and 4 rotate.
In the above embodiment, the Hall element is used as an example of the first and second magnetic sensors 3 and 4, but other magnetic sensors such as a magnetoresistive element (MRE) may be used.
In the above embodiment, two magnetic sensors (first and second magnetic sensors 3 and 4) are used as an example of the magnetic detection means. However, the rotation angle within a predetermined angle is detected by one magnetic sensor. May be.

上記の実施例では、磁石２が１回転することで、磁気検出手段に１つのサイン曲線磁場を与える例を示したが、磁石２が１回転することで、磁気検出手段に複数のサイン曲線磁場を与えように設けても良い。
上記の実施例では、回転角度検出装置によってスロットルバルブの開度を検出する例を示したが、アクセルペダルの回転角度（踏み込み量）、エンジンのクランクシャフトの回転角度、産業ロボットのアーム部の回転角度等、他の回転角度を検出する回転角度検出装置に本発明を適用しても良い。 In the above-described embodiment, an example is shown in which one sine curve magnetic field is given to the magnetic detection means by one rotation of the magnet 2, but a plurality of sine curve magnetic fields are given to the magnetic detection means by one rotation of the magnet 2. May be provided.
In the above embodiment, an example in which the opening degree of the throttle valve is detected by the rotation angle detection device has been shown. However, the rotation angle (depression amount) of the accelerator pedal, the rotation angle of the engine crankshaft, the rotation of the arm portion of the industrial robot You may apply this invention to the rotation angle detection apparatus which detects other rotation angles, such as an angle.

回転センサ部の概略図である（従来技術、参考例、実施例１）。It is the schematic of a rotation sensor part (prior art, reference example, Example 1). センサ出力図である（従来技術、参考例、実施例１）。It is a sensor output figure (prior art, reference example, Example 1). 回転センサ部に外部磁場を与えた説明図である（参考例、実施例１）。It is explanatory drawing which gave the external magnetic field to the rotation sensor part (reference example, Example 1). 回転センサ部に外部磁場を与えた場合のセンサ出力図および比較図である（従来技術、実施例１）。It is a sensor output figure at the time of giving an external magnetic field to a rotation sensor part, and a comparison figure (prior art, Example 1). 回転角度検出装置の電気回路の概略図である（実施例１）。(Example 1) which is the schematic of the electric circuit of a rotation angle detection apparatus. センサ出力、逆三角関数演算、繋ぎ合わせの説明用のグラフである（実施例１）。(Example 1) which is a graph for description of sensor output, inverse trigonometric function calculation, and joining. 回転センサ部の概略図およびセンサ出力図である（実施例２）。(Example 2) which is the schematic of a rotation sensor part, and a sensor output figure. 回転センサ部の概略図およびセンサ出力図である（実施例３）。(Example 3) which is the schematic of a rotation sensor part, and a sensor output figure. 回転センサ部の概略図である（実施例４）。(Example 4) which is the schematic of a rotation sensor part.

符号の説明Explanation of symbols

２ 磁石
３ 第１磁気センサ
４ 第２磁気センサ
５ ヨーク
１１ 第２磁石
１２ 第２ヨーク
2 magnet 3 first magnetic sensor 4 second magnetic sensor 5 yoke 11 second magnet 12 second yoke

Claims (6)

相対回転する一方に設けられた磁石と、
相対回転する他方に設けられ、前記磁石から与えられる磁気変化を検出する磁気検出手段とを具備し、
相対回転する一方および他方の相対回転角度を、前記磁気検出手段の検出した磁気変化により求める回転角度検出装置において、
前記磁気検出手段は、前記磁石の軸方向に配置され、
前記磁石は、軸方向に磁力線が向くように軸方向着磁され、前記磁気検出手段に対する回転軌跡上にサイン曲線磁場を発生するものであり、
さらに、前記磁石は、前記磁気検出手段とは軸方向に異なる面に、磁性体製のヨークを備えることを特徴とする回転角度検出装置。 A magnet provided on one of the relatively rotating sides;
A magnetic detection means provided on the other side of the relative rotation for detecting a magnetic change applied from the magnet;
In the rotation angle detection device for obtaining the relative rotation angle of the one and the other rotating relative to each other based on the magnetic change detected by the magnetic detection means,
The magnetic detection means is arranged in the axial direction of the magnet,
The magnet is axially magnetized so that the magnetic lines of force are directed in the axial direction, and generates a sine curve magnetic field on a rotation locus with respect to the magnetic detection means,
Further, the magnet includes a yoke made of a magnetic material on a surface different from the magnetic detection means in the axial direction. 請求項１に記載の回転角度検出装置において、
前記ヨークは、前記磁石における前記磁気検出手段とは軸方向に異なる側の全面を覆うことを特徴とする回転角度検出装置。 The rotation angle detection device according to claim 1,
The rotation angle detection apparatus according to claim 1, wherein the yoke covers the entire surface of the magnet on a side different from the magnetic detection means in the axial direction. 請求項１または請求項２に記載の回転角度検出装置において、
前記磁気検出手段は、磁気変化を検出する第１磁気センサと、この第１磁気センサに対して９０°位相のズレた磁気変化を検出する第２磁気センサとを具備し、
相対回転する一方および他方の相対回転角度を、前記第１、第２磁気センサの検出した磁気変化により求めることを特徴とする回転角度検出装置。 In the rotation angle detection device according to claim 1 or 2,
The magnetic detection means includes a first magnetic sensor that detects a magnetic change, and a second magnetic sensor that detects a magnetic change that is 90 ° out of phase with the first magnetic sensor,
A rotation angle detection device characterized in that the relative rotation angle of one and the other rotating relative to each other is obtained from a magnetic change detected by the first and second magnetic sensors. 請求項１〜請求項３のいずれかに記載の回転角度検出装置において、
この回転角度検出装置は、前記磁石と軸方向に隙間を隔て対向配置され、前記磁石との対向面が前記磁石と逆磁極で、前記磁石と一体に回転する第２磁石を備え、
前記磁気検出手段は、前記磁石と前記第２磁石との軸方向の間に配置されることを特徴とする回転角度検出装置。 In the rotation angle detection device according to any one of claims 1 to 3,
The rotation angle detection device includes a second magnet that is disposed to face the magnet with a gap in the axial direction, and the surface facing the magnet is a reverse magnetic pole to the magnet and rotates integrally with the magnet.
The rotation angle detection device according to claim 1, wherein the magnetic detection means is arranged between the magnet and the second magnet in the axial direction. 請求項４に記載の回転角度検出装置において、
前記第２磁石は、軸方向に磁力線が向くように軸方向着磁されて、前記磁気検出手段に対する回転軌跡上に、前記磁石とは逆相のサイン曲線磁場を発生するものであり、
さらに、前記第２磁石は、前記磁気検出手段とは軸方向に異なる面に、磁性体製の第２ヨークを備えることを特徴とする回転角度検出装置。 In the rotation angle detection device according to claim 4,
The second magnet is axially magnetized so that the magnetic lines of force are directed in the axial direction, and generates a sine curve magnetic field having a phase opposite to that of the magnet on a rotation locus with respect to the magnetic detection means,
Furthermore, the second magnet includes a second yoke made of a magnetic material on a surface different from the magnetic detection means in the axial direction. 請求項１〜請求項５のいずれかに記載の回転角度検出装置において、
前記磁石は、回転軸に対して垂直方向に平面を成す円盤形状を呈し、
前記磁気検出手段に対して前記磁石が１回転することで、前記磁気検出手段に１つのサイン曲線磁場を与えることを特徴とする回転角度検出装置。
In the rotation angle detection device according to any one of claims 1 to 5,
The magnet has a disk shape that forms a plane perpendicular to the rotation axis,
The rotation angle detection device according to claim 1, wherein a single sine curve magnetic field is applied to the magnetic detection means by rotating the magnet once with respect to the magnetic detection means.
JP2006085368A 2006-03-27 2006-03-27 Rotation angle detector Withdrawn JP2007263585A (en)

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