JP3023324B2 - Magnetic encoder - Google Patents
Magnetic encoderInfo
- Publication number
- JP3023324B2 JP3023324B2 JP9086003A JP8600397A JP3023324B2 JP 3023324 B2 JP3023324 B2 JP 3023324B2 JP 9086003 A JP9086003 A JP 9086003A JP 8600397 A JP8600397 A JP 8600397A JP 3023324 B2 JP3023324 B2 JP 3023324B2
- Authority
- JP
- Japan
- Prior art keywords
- rotating body
- teeth
- magnetic
- notch
- magnetoresistive elements
- 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.)
- Expired - Fee Related
Links
Landscapes
- Transmission And Conversion Of Sensor Element Output (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は電動機や、例えばオ
ートバイなどの回転部分の回転軸に取り付けるなどし、
その回転情報を検出する磁気式エンコーダに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor and a rotary shaft of a rotating part such as a motorcycle.
The present invention relates to a magnetic encoder that detects the rotation information.
【０００２】[0002]
【従来の技術】従来は、磁気式エンコーダで１信号／１
回転の原点信号を取り出す場合及び９０°位相差のＡＢ
２信号を取り出す場合には図３に示すような構成になっ
ていた。図３は、従来例における磁気式エンコーダの回
転位置検出手段を説明する概要構成図である。すなわ
ち、一部品からなり、かつ磁性体からなる回転体２１の
円周の一部に切欠き部（凹部）２１ｂを設け、この切欠
き部２１ｂを磁気センサ２３の磁気抵抗素子ＭＲ２４，
２５で検出することによって原点信号を取り出してい
た。また、別部品からなる他の磁性体からなる回転体２
２の円周全てに等間隔に歯２２ａを設け、これらの歯２
２ａによる凹凸を磁気センサ２３の磁気抵抗素子ＭＲで
検出することによってインクレメンタルエンコーダとし
ての機能を有する９０°位相差２信号を取り出してい
た。2. Description of the Related Art Conventionally, a magnetic encoder uses one signal / one signal.
Extraction of origin signal of rotation and AB with 90 ° phase difference
When two signals are extracted, the configuration is as shown in FIG. FIG. 3 is a schematic configuration diagram illustrating a rotational position detecting means of a magnetic encoder in a conventional example. That is, a notch (recess) 21b is provided in a part of the circumference of the rotating body 21 made of one component and made of a magnetic material, and the notch 21b is provided in the magnetic resistance element MR24, MR24 of the magnetic sensor 23.
The origin signal is extracted by detecting at 25. Also, a rotating body 2 made of another magnetic body made of another part
The teeth 22a are provided at equal intervals on the entire circumference of
By detecting the unevenness due to 2a with the magnetoresistive element MR of the magnetic sensor 23, two 90 ° phase difference signals having a function as an incremental encoder are extracted.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来の磁気式
エンコーダにおいては、円周の一部に切欠き部２１ｂを
設けて原点信号を取り出す回転体２１と円周全体に等間
隔に歯２２ａを設けて９０°位相差２信号を取り出す回
転体２２とがそれぞれ別体のものであり、これら別体の
回転体２１と２２とをまず、別々に製作し、それらを一
体としているため、製作が煩雑であり、かつ部品点数も
多く非常にコスト高なものになるという欠点があった。However, in the conventional magnetic encoder, a notch 21b is provided in a part of the circumference, and the rotating body 21 for extracting the origin signal and the teeth 22a are arranged at equal intervals on the entire circumference. The rotating body 22 that is provided and takes out the two signals of 90 ° phase difference is a separate body, and these separate rotating bodies 21 and 22 are first manufactured separately and integrated, so that the manufacturing is There is a drawback that it is complicated, and the number of parts is large and the cost is very high.
【０００４】本発明はこのような点に鑑みてなされたも
のであり、製造工程、部品点数が少なく価格が安く、各
種の回転情報を検出可能とし、かつ、一枚の回転体でエ
ンコーダのみならずギアとしても使用し得る磁気式エン
コーダを提供することを目的とする。[0004] The present invention has been made in view of the above-mentioned points, and it is possible to detect various kinds of rotation information with a small number of manufacturing processes and a small number of parts, and to detect various kinds of rotation information. It is an object of the present invention to provide a magnetic encoder that can be used as a gear.
【０００５】[0005]
【課題を解決するための手段】磁束密度が疎になると抵
抗値が小さくなる（または大きくなる）特性の揃った一
対の磁気抵抗素子を直列に接続し、一端に直流電圧を印
加し、他端をアースに落とす。一対の磁気抵抗素子の接
続点を検出信号の取り出し端子とする。この一対の磁気
抵抗素子を磁性体からなる回転体の円周の歯ピッチに略
等しい間隔で対向配置する。一対の磁気抵抗素子を回転
体の円周の歯ピッチに略等しい間隔で対向配置すること
により、各磁気抵抗素子の位置における磁束の密度は同
じように変化し、各磁気抵抗素子の抵抗も同じように変
化する。すなわち、両磁気抵抗素子の抵抗値は常に等し
いので出力信号は印加した直流電圧の１／２で平坦な線
となる。Means for Solving the Problems A pair of magnetoresistive elements having uniform characteristics such that the resistance value decreases (or increases) when the magnetic flux density decreases is connected in series, a DC voltage is applied to one end, and the other end is applied. To ground. The connection point of the pair of magnetoresistive elements is used as a detection signal extraction terminal. The pair of magneto-resistive elements are opposed to each other at intervals substantially equal to the circumferential tooth pitch of the rotating body made of a magnetic material. By arranging a pair of magnetoresistive elements facing each other at an interval substantially equal to the tooth pitch of the circumference of the rotating body, the magnetic flux density at the position of each magnetoresistive element changes in the same way, and the resistance of each magnetoresistive element is also the same. To change. That is, since the resistance values of the two magnetoresistive elements are always equal, the output signal is a flat line at 1/2 of the applied DC voltage.
【０００６】[0006]
【発明の実施の形態】上記課題を解決するために本発明
による磁気式エンコーダは、円周に一定間隔のピッチで
所定数の歯を設けた磁性体からなる回転体１とこの回転
体１の円周の歯の凹凸を検出する磁気センサ５とを備
え、前記回転体１の回転情報を検出する磁気式エンコー
ダであって、前記回転体１には何れかの凸状の歯１ａの
一部を切り欠いた切欠き部１ｂを設け、前記磁気センサ
５には回転体１の歯１ａのピッチＰまたはその整数倍と
略等しい間隔で回転体１の円周に対向配置する一対の磁
気抵抗素子ＭＲ１，２を設け、前記磁気抵抗素子ＭＲ
１，２は互いに直列接続され、その接続点を中点Ｍと
し、直列接続され磁気抵抗素子ＭＲ１，２の一端は直流
電源に接続し、他端はアースに接続し、前記中点Ｍから
原点信号を取り出すようにしたことに特徴を有してい
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above-mentioned problems, a magnetic encoder according to the present invention comprises a rotating body 1 made of a magnetic body having a predetermined number of teeth provided at a constant pitch on the circumference thereof. A magnetic encoder for detecting rotation information of the rotating body, comprising: a magnetic sensor for detecting unevenness of circumferential teeth, wherein the rotating body includes a part of any of the convex teeth; A pair of magnetoresistive elements are provided in the magnetic sensor 5 so as to face the circumference of the rotating body 1 at intervals substantially equal to the pitch P of the teeth 1a of the rotating body 1 or an integer multiple thereof. MR1 and MR2, and the magnetoresistive element MR
1 and 2 are connected in series with each other, and the connection point is defined as a midpoint M
And one end of each of the magnetoresistive elements MR1 and MR2 is connected in series.
It is characterized in that it is connected to a power source, the other end is connected to ground, and an origin signal is extracted from the midpoint M.
【０００７】また、本発明による磁気式エンコーダは、
一部材からなり、かつ円周に一定間隔のピッチで所定数
の歯を設けた磁性体からなる回転体１とこの回転体１の
円周の歯の凹凸を検出する磁気センサ６とを備え、前記
回転体１の回転情報を検出する磁気式エンコーダであっ
て、前記回転体１は何れかの凸状の歯１ａの一部を切り
欠いた切欠き部１ｂを設けて切欠き部１ｂを有する側の
回転部１１と切欠き部１ｂの無い側の回転部１２とから
形成し、前記磁気センサ６には回転体１の歯１ａのピッ
チＰまたはその整数倍と略等しい間隔で切欠き部１ｂの
ある回転部１１の円周に対向配置する一対の磁気抵抗素
子ＭＲ１，２を設け、前記磁気抵抗素子ＭＲ１，２は互
いに直列接続され、その接続点を中点Ｍとし、直列接続
され磁気抵抗素子ＭＲ１，２の一端は直流電源に接続
し、他端はアースに接続し、前記中点Ｍから原点信号を
取出し、切欠き部１ｂの無い回転部１２に対向配置した
磁気抵抗素子列からは９０°位相差２信号を取り出し可
能とし、かつギアとしても使用可能としたことに特徴を
有している。Further, the magnetic encoder according to the present invention comprises:
A rotating body 1 made of a magnetic material and made of one member and provided with a predetermined number of teeth at a constant pitch on the circumference; and a magnetic sensor 6 for detecting unevenness of the circumferential teeth of the rotating body 1. A magnetic encoder for detecting rotation information of the rotating body 1, wherein the rotating body 1 is provided with a cutout portion 1 b in which a portion of any of the convex teeth 1 a is cutout and has a cutout portion 1 b. The magnetic sensor 6 is formed with the notches 1b at intervals substantially equal to the pitch P of the teeth 1a of the rotating body 1 or an integral multiple thereof. a pair of magnetoresistive elements MR1,2 facing circumferentially disposed of rotating part 11 with a formed, said magnetoresistive element MR1,2 are each other
Connected in series, and the connection point is set to midpoint M, and connected in series.
And one ends of the magnetoresistive elements MR1 and MR2 are connected to a DC power supply.
The other end is connected to the ground, an origin signal is taken out from the middle point M, and two signals of 90 ° phase difference can be taken out from the magnetoresistive element array arranged opposite to the rotating part 12 without the notch 1b. It is also characterized by being usable as a gear.
【０００８】[0008]
【実施例】以下、本発明の一実施例を図面に基づいて説
明する。図１（ａ）は本発明の磁気式エンコーダの一実
施例の基本原理を示すもので、概略側面図である。
（ｂ）は磁気式エンコーダで使用される磁気センサの回
路図であり、（ｃ）は検出波形を示す波形図である。
（ａ）において、磁気式エンコーダとしての磁性体から
なる円板状の回転体１には円周に一定間隔のピッチＰで
所定数の凸状の歯１ａを設けて周面を凹凸に形成し、更
にその中の一枚の歯１ａの一部を欠いた切欠き部１ｂを
設けている。回転位置検出手段としての磁気センサ５は
磁束密度が疎になると抵抗値が小さくなる（または大き
くなる）磁気抵抗素子ＭＲ１，２及びこれらの磁気抵抗
素子ＭＲ１，２に磁気バイアスを与える永久磁石４等か
ら構成されている。例では永久磁石４の極性から磁束７
は矢印のように図の下から上方向に向かっている。ま
た、図に示すように、磁気抵抗素子ＭＲ１，２は歯１ａ
のピッチＰに略等しい間隔で回転体１の円周に離間して
対向配置されている。An embodiment of the present invention will be described below with reference to the drawings. FIG. 1A is a schematic side view showing a basic principle of an embodiment of a magnetic encoder according to the present invention.
(B) is a circuit diagram of a magnetic sensor used in the magnetic encoder, and (c) is a waveform diagram showing a detection waveform.
In (a), a disk-shaped rotating body 1 made of a magnetic material as a magnetic encoder is provided with a predetermined number of convex teeth 1a at a constant pitch P around the circumference to form an uneven surface. Further, a notch 1b is provided in which a part of one tooth 1a is missing. The magnetic sensor 5 serving as the rotational position detecting means has a resistance value that decreases (or increases) as the magnetic flux density decreases, and a permanent magnet 4 that applies a magnetic bias to the magnetic resistance elements MR1 and MR2. It is composed of In the example, the magnetic flux 7
Is upward from the bottom of the figure as indicated by the arrow. As shown in the figure, the magnetoresistive elements MR1 and MR2 have teeth 1a.
At a pitch substantially equal to the pitch P of the rotating body 1 and spaced apart from each other.
【０００９】（ｂ）において、Ｅは直流電源であり、Ｒ
１，２は磁気抵抗素子ＭＲ１，２の抵抗値である。直列
接続された磁気抵抗素子ＭＲ１，２は直流電源Ｅとアー
ス間に挿入されており、磁気抵抗素子ＭＲ１，２の接続
点は中点Ｍであり、その電位はＶｄである。中点Ｍの電
位Ｖｄは次式（１）で表される。 Ｖｄ＝Ｅ×Ｒ２／（Ｒ１＋Ｒ２） ・・・（１）In (b), E is a DC power source, and R
Reference numerals 1 and 2 are resistance values of the magnetoresistive elements MR1 and MR2. The serially connected magnetoresistive elements MR1 and MR2 are inserted between the DC power supply E and the ground, the connection point of the magnetoresistive elements MR1 and MR2 is at the middle point M, and the potential is Vd. The potential Vd at the midpoint M is expressed by the following equation (1). Vd = E × R2 / (R1 + R2) (1)
【００１０】（ａ）から明らかなようにピッチＰの歯１
ａが磁気抵抗素子ＭＲ１，２の近傍を回転移動しても磁
気抵抗素子ＭＲ１，２を通る磁束密度の変化は略同じで
ある。従って、抵抗値はＲ１＝Ｒ２となり、中点Ｍの電
位はＶｄ＝Ｅ／２で変化しない。（ｃ）における略正弦
波の前後がこれに相当する。As is apparent from FIG.
Even if a rotates around the magnetoresistive elements MR1 and MR2, the change in the magnetic flux density passing through the magnetoresistive elements MR1 and MR2 is substantially the same. Therefore, the resistance value becomes R1 = R2, and the potential of the middle point M does not change at Vd = E / 2. The area before and after the substantially sine wave in (c) corresponds to this.
【００１１】ここで、いま、回転体１が、例えば矢印の
方向に回転し、切欠き部１ｂが磁気抵抗素子ＭＲ１の近
傍にくると、磁気抵抗素子ＭＲ１の抵抗値Ｒ１は小さく
なりＲ１＜Ｒ２となる。更に切欠き部１ｂが磁気抵抗素
子ＭＲ２の近傍にくると、磁気抵抗素子ＭＲ２の抵抗値
Ｒ２は小さくなりＲ２＜Ｒ１となる。従って、切欠き部
１ｂが磁気抵抗素子ＭＲ１，２の近傍を通過すると、
（ｃ）に示すような略正弦波が表れる。すなわち、回転
体１が１回転したかなどの原点信号としてこの略正弦波
を検出することができる。（ｃ）における検出波形は磁
気抵抗素子ＭＲ１，２が通る磁束密度が疎になると抵抗
値が小さくなる場合を示している。Here, when the rotating body 1 rotates in the direction of the arrow, for example, and the notch 1b comes near the magnetoresistive element MR1, the resistance value R1 of the magnetoresistive element MR1 decreases and R1 <R2. Becomes Further, when the notch 1b comes close to the magnetoresistive element MR2, the resistance value R2 of the magnetoresistive element MR2 decreases and R2 <R1. Therefore, when the notch 1b passes near the magnetoresistive elements MR1 and MR2,
A substantially sinusoidal wave as shown in FIG. That is, the substantially sine wave can be detected as an origin signal indicating whether the rotating body 1 has made one rotation. The detection waveform in (c) shows a case where the resistance value decreases as the magnetic flux density passing through the magnetoresistive elements MR1 and MR2 decreases.
【００１２】図２は、本発明の具体例の磁気式エンコー
ダの回転位置検出手段を説明する概要構成図である。図
において、回転体１には円周に一定間隔のピッチＰで所
定数の歯１ａを設け、かつ一つの歯１ａを切り欠いた切
欠き部１ｂを設けている。この切欠き部１ｂを設けた側
の回転部１１は原点信号検出用であり、切欠き部１ｂを
設けてない側の回転部１２は９０°位相差２信号検出用
としている。FIG. 2 is a schematic diagram illustrating the rotational position detecting means of the magnetic encoder according to the embodiment of the present invention. In the figure, the rotating body 1 is provided with a predetermined number of teeth 1a at a constant pitch P around the circumference, and a notch 1b in which one tooth 1a is cut out. The rotating portion 11 provided with the notch portion 1b is used for detecting the origin signal, and the rotating portion 12 provided with no notch portion 1b is used for detecting the 90 ° phase difference 2 signal.
【００１３】すなわち、図において、回転体１の周面の
白部分が凸状の歯１ａであり、所定数の歯１ａが設けら
れ、周面は本来、通常のギアのように凹凸となってい
る。また、図示の状態において、多数の歯１ａのうち、
例えば左側の位置であって、何れかの一つの歯１ａを切
欠き、切欠き部１ｂを設けている。右側は切欠きがな
く、ギアとしての使用を可能としている。That is, in the figure, a white portion of the peripheral surface of the rotating body 1 is a convex tooth 1a, a predetermined number of teeth 1a are provided, and the peripheral surface is originally uneven like a normal gear. I have. Further, in the state shown in FIG.
For example, at a position on the left side, one of the teeth 1a is cut out, and a notch 1b is provided. There is no notch on the right side, enabling use as a gear.
【００１４】製作にあたっては、多数の歯１ａを有する
一部材からなる回転体１をまず製作し、そのうちの所定
の歯１ａの左側を切削加工により切欠くことにより、従
来に比べて極めて容易にエンコーダの主要部品を得るこ
とができる。なお、切欠きは右側に設けても良いことは
勿論である。At the time of manufacture, the rotary body 1 composed of one member having a large number of teeth 1a is first manufactured, and the left side of a predetermined tooth 1a is cut out by cutting, so that the encoder is extremely easily manufactured as compared with the conventional method. Main parts can be obtained. Note that the notch may be provided on the right side.
【００１５】回転部１１の円周上であって切欠き部１ｂ
のある側には図１と同様に磁気抵抗素子ＭＲ１，２が歯
１ａのピッチＰまたはその整数倍と略等しい間隔で対向
配置されている。従って、上述したように原点信号を取
り出すことができる。また、回転部１２の円周には磁気
抵抗素子ＭＲ３〜６を歯１ａのピッチＰの４分の１間隔
で順次対向配置し、磁気抵抗素子ＭＲ３とＭＲ５を一対
としており、磁気抵抗素子ＭＲ４とＭＲ６とを一対とし
ている。従って、磁気抵抗素子ＭＲ３とＭＲ５の一対を
９０°位相差２信号のＡ信号用とすれば、磁気抵抗素子
ＭＲ４とＭＲ６の一対は９０°位相差２信号のＢ信号用
となり、インクレメンタルエンコーダとして用いること
ができるとともに、通常のギアとしても使用でき、例え
ば他のギアと歯合させるなどして回転伝達機能として、
用いることができる。Notch 1b on the circumference of rotating part 11
As shown in FIG. 1, the magnetoresistive elements MR1 and MR2 are opposed to each other at intervals substantially equal to the pitch P of the teeth 1a or an integral multiple thereof. Therefore, the origin signal can be extracted as described above. Further, on the circumference of the rotating portion 12, the magnetoresistive elements MR3 to MR6 are sequentially arranged opposite to each other at a quarter interval of the pitch P of the teeth 1a, and the magnetoresistive elements MR3 and MR5 are paired. MR6 is paired. Therefore, if one pair of the magnetoresistive elements MR3 and MR5 is used for the A signal of two 90 ° phase difference signals, the pair of the magnetoresistive elements MR4 and MR6 is used for the B signal of two 90 ° phase difference signals, and as an incremental encoder. While it can be used, it can also be used as a normal gear, for example, as a rotation transmission function by meshing with other gears,
Can be used.
【００１６】なお、図示の例では円板状の回転体１の外
周面に歯１ａを設けた例について説明したが、例えばド
ーナツ型をなし、内周部と外周部にそれぞれ歯が設けら
れたギアに対し、内周部の何れかの歯の一部に切欠きを
設けたものにも適用し得る。このようなドーナツ型のギ
アからなる回転体は外周側の歯を他のギアと歯合させて
回転させれば良い。また、外側の歯の一部に切欠きを設
け、内，外両者からそれぞれ回転情報を取り出すように
することもできる。In the illustrated example, an example in which the teeth 1a are provided on the outer peripheral surface of the disk-shaped rotating body 1 has been described. However, for example, a donut shape is provided, and the teeth are provided on the inner peripheral portion and the outer peripheral portion, respectively. The present invention can also be applied to a gear in which a notch is provided in a part of any tooth of the inner peripheral portion. The rotating body composed of such a donut-shaped gear may be rotated by meshing teeth on the outer peripheral side with other gears. In addition, a cutout may be provided in a part of the outer teeth to extract rotation information from both the inside and the outside.
【００１７】[0017]
【発明の効果】以上説明したように、本発明による磁気
式エンコーダは、一部品からなる回転体１の何れかの歯
１ａの一部を切欠くだけなので、製作が容易で、コスト
安を実現でき、かつ切欠き部１ｂのある側から原点信号
を、ない側からインクレメンタル信号を取り出すことが
でき、しかもエンコーダ機能に加えて通常のギアとして
も使用でき、適用範囲が広く利便性に優れている。As described above, the magnetic encoder according to the present invention can be easily manufactured and can be manufactured at low cost because only one of the teeth 1a of the rotating body 1 is cut out. In addition, the origin signal can be taken out from the side with the notch 1b, and the incremental signal can be taken out from the side without the notch 1b. Further, in addition to the encoder function, it can be used as a normal gear. .
【図１】（ａ）は本発明の磁気式エンコーダの一実施例
の基本原理を示す概略側面図であり、（ｂ）は磁気式エ
ンコーダで使用される磁気センサの回路図であり、
（ｃ）は検出波形を示す波形図である。FIG. 1A is a schematic side view showing a basic principle of an embodiment of a magnetic encoder according to the present invention, and FIG. 1B is a circuit diagram of a magnetic sensor used in the magnetic encoder;
(C) is a waveform diagram showing a detection waveform.
【図２】本発明の具体例における磁気式エンコーダの回
転位置検出手段を説明する概要構成図である。FIG. 2 is a schematic configuration diagram illustrating a rotational position detection unit of a magnetic encoder according to a specific example of the present invention.
【図３】従来例における磁気式エンコーダの回転位置検
出手段を説明する概要構成図である。FIG. 3 is a schematic configuration diagram illustrating a rotational position detecting unit of a magnetic encoder in a conventional example.
【符号の説明】 １ 回転体 １ａ 歯 １ｂ 切欠き部 ４ 永久磁石 ５ 磁気センサ ６ 磁気センサ ７ 磁束 ８ 回転軸 １１ 回転部 １２ 回転部 Ｅ 直流電源 ＭＲ１〜６ 磁気抵抗素子 Ｐ 歯と歯のピッチ Ｒ１，２ 磁気抵抗素子ＭＲ１，２の抵抗値 Ｖｄ 中点Ｍの電位[Description of Signs] 1 Rotating body 1a Tooth 1b Notch 4 Permanent magnet 5 Magnetic sensor 6 Magnetic sensor 7 Magnetic flux 8 Rotating shaft 11 Rotating unit 12 Rotating unit E DC power supply MR1-6 Magnetic resistance element P Tooth pitch R1 , 2 The resistance value of the magnetoresistive elements MR1, MR2 Vd The potential at the midpoint M
フロントページの続き (56)参考文献 特開 昭57−46117（ＪＰ，Ａ) 特開 平８−21744（ＪＰ，Ａ) 特開 平６−34391（ＪＰ，Ａ) 特開 平５−288568（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01D 5/00 - 5/62 G01B 7/00 - 7/12 G01P 1/00 - 3/80 Continuation of front page (56) References JP-A-57-46117 (JP, A) JP-A-8-21744 (JP, A) JP-A-6-34391 (JP, A) JP-A-5-288568 (JP, A) , A) (58) Field surveyed (Int. Cl. 7 , DB name) G01D 5/00-5/62 G01B 7 /00-7/12 G01P 1/00-3/80
Claims (2)
設けた磁性体からなる回転体（１）とこの回転体（１）
の円周の歯の凹凸を検出する磁気センサ（５）とを備
え、前記回転体（１）の回転情報を検出する磁気式エン
コーダであって、 前記回転体（１）には何れかの凸状の歯（１ａ）の一部
を切り欠いた切欠き部（１ｂ）を設け、 前記磁気センサ（５）には回転体（１）の歯（１ａ）の
ピッチ（Ｐ）またはその整数倍と略等しい間隔で回転体
（１）の円周に対向配置する一対の磁気抵抗素子（ＭＲ
１，２）を設け、前記磁気抵抗素子（ＭＲ１，２）は互いに直列接続さ
れ、その接続点を中点Ｍとし、直列接続され磁気抵抗素
子（ＭＲ１，２）の一端は直流電源に接続し、他端はア
ースに接続し、 前記中点Ｍから 原点信号を取り出すようにしたことを特
徴とする磁気式エンコーダ。1. A predetermined number of teeth are provided at a constant pitch on the circumference.
Rotating body (1) made of magnetic material provided and rotating body (1)
And a magnetic sensor (5) for detecting the irregularities of the teeth on the circumference of the
A magnetic engine for detecting rotation information of the rotating body (1).
A part of any of the convex teeth (1a) on the rotating body (1);
The magnetic sensor (5) is provided with a notch portion (1b) in which the teeth (1a) of the rotating body (1) are notched.
Rotating body at an interval substantially equal to the pitch (P) or an integer multiple thereof
A pair of magnetoresistive elements (MR
1, 2)The magnetoresistive elements (MR1, 2) are connected in series with each other.
The connection point is defined as a middle point M, and the magnetoresistive elements are connected in series.
One end of each of the daughters (MR1, 2) is connected to a DC power supply, and the other end is
Source, From the midpoint M It is noted that the origin signal is taken out.
Magnetic encoder.
ピッチで所定数の歯を設けた磁性体からなる回転体
（１）とこの回転体（１）の円周の歯の凹凸を検出する
磁気センサ（６）とを備え、前記回転体（１）の回転情
報を検出する磁気式エンコーダであって、 前記回転体（１）は何れかの凸状の歯（１ａ）の一部を
切り欠いた切欠き部（１ｂ）を設けて切欠き部（１ｂ）
を有する側の回転部（１１）と切欠き部（１ｂ）の無い
側の回転部（１２）とから形成し、 前記磁気センサ（６）には回転体（１）の歯（１ａ）の
ピッチ（Ｐ）またはその整数倍と略等しい間隔で切欠き
部（１ｂ）のある回転部（１１）の円周に対向配置する
一対の磁気抵抗素子（ＭＲ１，２）を設け、前記磁気抵抗素子（ＭＲ１，２）は互いに直列接続さ
れ、その接続点を中点Ｍとし、直列接続され磁気抵抗素
子（ＭＲ１，２）の一端は直流電源に接続し、他端はア
ースに接続し、前記中点Ｍから 原点信号を取出し、切欠
き部（１ｂ）の無い回転部（１２）に対向配置した磁気
抵抗素子列からは９０°位相差２信号を取り出し可能と
し、かつギアとしても使用可能としたことを特徴とする
磁気式エンコーダ。2. A rotator (1) made of one member and made of a magnetic material having a predetermined number of teeth provided at a constant pitch on the circumference and irregularities of teeth on the circumference of the rotator (1). A magnetic sensor (6) for detecting rotation information of the rotating body (1), wherein the rotating body (1) is a part of any of the convex teeth (1a). A notch (1b) is formed by cutting a notch (1b).
And a rotating portion (12) having no notch (1b), and the magnetic sensor (6) has a pitch of teeth (1a) of the rotating body (1). (P) or an integral multiple thereof and notches at approximately equal intervals rotary part with (1b) a pair of magnetoresistive elements arranged opposite to the circumference of (11) (MR1,2) provided, said magnetoresistive element ( MR1, 2) are connected in series with each other.
The connection point is defined as a middle point M, and the magnetoresistive elements are connected in series.
One end of each of the daughters (MR1, 2) is connected to a DC power supply, and the other end is
Source signal from the middle point M, and two 90 ° phase-difference signals can be extracted from a magnetoresistive element array arranged opposite to the rotating part (12) having no notch (1b). A magnetic encoder characterized by being usable as a gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9086003A JP3023324B2 (en) | 1997-03-18 | 1997-03-18 | Magnetic encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9086003A JP3023324B2 (en) | 1997-03-18 | 1997-03-18 | Magnetic encoder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10260061A JPH10260061A (en) | 1998-09-29 |
| JP3023324B2 true JP3023324B2 (en) | 2000-03-21 |
Family
ID=13874510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9086003A Expired - Fee Related JP3023324B2 (en) | 1997-03-18 | 1997-03-18 | Magnetic encoder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3023324B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4506960B2 (en) * | 2004-09-17 | 2010-07-21 | Ｔｄｋ株式会社 | Moving body position detection device |
| JP2011247746A (en) * | 2010-05-27 | 2011-12-08 | Iai Corp | Linear encoder and actuator |
| CN111337058B (en) * | 2020-03-02 | 2021-12-03 | 长春禹衡光学有限公司 | Gear type encoder reading head |
-
1997
- 1997-03-18 JP JP9086003A patent/JP3023324B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10260061A (en) | 1998-09-29 |
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