JPH052925B2 - - Google Patents
Info
- Publication number
- JPH052925B2 JPH052925B2 JP58146309A JP14630983A JPH052925B2 JP H052925 B2 JPH052925 B2 JP H052925B2 JP 58146309 A JP58146309 A JP 58146309A JP 14630983 A JP14630983 A JP 14630983A JP H052925 B2 JPH052925 B2 JP H052925B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetoresistive elements
- rotating body
- reference point
- bridge
- 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 - Lifetime
Links
- 239000000758 substrate Substances 0.000 claims description 4
- 230000005415 magnetization Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 230000005389 magnetism Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
- G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
- G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
- G01D5/2454—Encoders incorporating incremental and absolute signals
- G01D5/2455—Encoders incorporating incremental and absolute signals with incremental and absolute tracks on the same encoder
- G01D5/2457—Incremental encoders having reference marks
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は回転体の回転角度、回転数を検出する
磁気式ロータリーエンコーダに関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic rotary encoder that detects the rotation angle and rotation speed of a rotating body.
従来、全周上に配置された交互に着磁方向を異
にする複数の信号用磁極と、前記周上の１点に配
置された基準点用磁極とからなる着磁部を有する
回転体と、前記回転体の着磁部に対して一定間隔
をおいて離間配置されている磁気センサとを備え
る磁気式ロータリーエンコーダとしては、特開昭
55−35203号に開示のものが知られている。
Conventionally, a rotating body has a magnetized portion consisting of a plurality of signal magnetic poles arranged on the entire circumference and having different magnetization directions alternately, and a reference point magnetic pole arranged at one point on the circumference. A magnetic rotary encoder equipped with a magnetic sensor arranged at a constant interval with respect to the magnetized portion of the rotating body is disclosed in Japanese Patent Application Laid-open No.
The one disclosed in No. 55-35203 is known.
ところで、前記開示による既知の磁気式ロータ
リーエンコーダは、前記基準点用磁極として、信
号用磁極とは異なる１つの磁極を用いたもの、ま
たは、少なくとも一部を欠落させた１つ以上の信
号用磁極を用いたものであつて、比較的高精度の
基準出力信号を得ることができるものの、温度変
化に伴う前記基準出力信号（オフセツト電圧）の
変動については何等考慮されていないものであつ
た。 By the way, the known magnetic rotary encoder according to the above disclosure uses one magnetic pole different from the signal magnetic pole as the reference point magnetic pole, or one or more signal magnetic poles with at least a portion missing. Although it is possible to obtain a reference output signal with relatively high accuracy, it does not take into account the fluctuation of the reference output signal (offset voltage) due to temperature changes.
本発明は、このような事情を考慮してなされた
もので、その目的は、温度変化に伴う基準出力信
号（オフセツト電圧）の変動がない磁気式ロータ
リーエンコーダーを提供することにある。
The present invention has been made in consideration of these circumstances, and its purpose is to provide a magnetic rotary encoder in which the reference output signal (offset voltage) does not fluctuate due to temperature changes.
前記目的を達成するために、本発明は、全周上
に配置された交互に着磁方向を異にする複数の信
号用磁極と、周上の１に配置された基準点用磁極
とからなる着磁部を有する回転体と、前記着磁部
に対して一定間隔において離間配置されている磁
気センサとを備える磁気式ロータリーエンコーダ
において、前記磁気センサは、前記回転体の回転
移動方向に直交するように並列近接配置された第
１及び第２の磁気抵抗素子と、前記第１及び第２
の磁気抵抗素子の配置基板と同じ基板上に、前記
第１及び第２の磁気抵抗素子の外側に近接しかつ
前記回転体の回転移動方向に平行に配置された第
３及び第４の非感磁型磁気抵抗素子とからなつて
おり、前記第１及び第２の磁気抵抗素子と前記第
３及び第４の非感磁型磁気抵抗素子とがブリツジ
接続され、このブリツジから検出出力が導出され
るようにしたものである。以下、実施例を用いて
本発明を詳細に説明する。
In order to achieve the above object, the present invention comprises a plurality of signal magnetic poles arranged on the entire circumference and alternately magnetized in different directions, and a reference point magnetic pole arranged at one point on the circumference. In a magnetic rotary encoder comprising a rotating body having a magnetized part and a magnetic sensor arranged at a constant interval with respect to the magnetized part, the magnetic sensor is perpendicular to the rotational movement direction of the rotating body. first and second magnetoresistive elements arranged in parallel and close to each other;
third and fourth insensitive elements arranged on the same substrate as the magnetoresistive element arrangement substrate, close to the outside of the first and second magnetoresistive elements and parallel to the rotational movement direction of the rotating body; The first and second magnetoresistive elements and the third and fourth non-magnetic magnetoresistive elements are bridge-connected, and a detection output is derived from the bridge. It was designed so that Hereinafter, the present invention will be explained in detail using Examples.
第１図は本発明の一実施例を示す構成図であ
る。第１図において、１は回転体となる磁気ドラ
ム、２は磁気ドラム１を回転させるモータ、３は
磁気ドラム１の全周上に配置された交互に着磁方
向を異にする複数の信号用磁極、即ち、インクリ
メント信号トラツク、４は磁気ドラム１に対して
一定間隔をおいて離間配置されている磁気セン
サ、５は磁気ドラム１の周上の１点に配置された
基準点用磁極であつて、前記複数の信号用磁極３
と前記点用磁極５は着磁部を形成している。
FIG. 1 is a block diagram showing an embodiment of the present invention. In Fig. 1, 1 is a magnetic drum that is a rotating body, 2 is a motor that rotates the magnetic drum 1, and 3 is a plurality of signals arranged around the entire circumference of the magnetic drum 1 that alternately have different magnetization directions. A magnetic pole, that is, an increment signal track; 4 is a magnetic sensor arranged at a constant interval with respect to the magnetic drum 1; 5 is a reference point magnetic pole arranged at one point on the circumference of the magnetic drum 1; and the plurality of signal magnetic poles 3
The point magnetic pole 5 forms a magnetized portion.
上記構成において、インクリメント信号トラツ
ク３とは別に、そのインクリメント信号の１〜３
周期分の幅を有する基準点用の着磁部５が設けて
あるので、磁気ドラム１が１回転するごとに、こ
れに面して固定された磁気センサにはインクリメ
ンタル信号の１〜３周期分のパルス幅の基準点出
力が得られる。 In the above configuration, in addition to the increment signal track 3, the increment signals 1 to 3 of the increment signal track 3 are
Since a reference point magnetized part 5 having a width equivalent to a period is provided, each time the magnetic drum 1 rotates once, the magnetic sensor fixed facing it receives a signal corresponding to 1 to 3 periods of the incremental signal. A reference point output with a pulse width of is obtained.
この基準点検出用の磁気センサとしては、第２
図に示すような構成のものを用いる。すなわち、
図においてRa1およびRa2は図中矢印で示した磁
気ドラム１の移動方向に直交するように配置され
た第１及び第２磁気抵抗素子であり、上記着磁部
５が矢印のように通過するとき、その電気抵抗が
変化して磁場を検知する。これに対し、前記第１
及び第２の磁気抵抗素子Ra1，Ra2の配置基板と
同じ基板上に、前記第１及び第２の磁気抵抗素子
Ra1，Ra2の外側に近接しかつ前記磁気ドラム１
の回転移動方向に平行に配置された第３及び第４
の磁気抵抗素子Rb1，Rb2は、ハツチグの部分、
すなわち磁気ドラム１の移動方向に平行に延在し
た主要部と、これらを結合する短い結合部とから
なる。このため、この磁気抵抗素子Rb1，Rb2は、
着磁部５が通過してもその磁場にはほとんど感じ
ない。すなわち、磁気抵抗素子は、第３図にB1，
B2で示すように当該磁気抵抗素子Ｒと同一面で
しかも電流Ｊと垂直な方向の磁場のみ検出するか
らである。 As a magnetic sensor for detecting this reference point, the second
The configuration shown in the figure is used. That is,
In the figure, Ra 1 and Ra 2 are first and second magnetoresistive elements arranged perpendicularly to the moving direction of the magnetic drum 1 indicated by the arrow in the figure, and the magnetized portion 5 passes as shown by the arrow. When it does, its electrical resistance changes and detects the magnetic field. On the other hand, the first
and the first and second magnetoresistive elements on the same substrate as that on which the second magnetoresistive elements Ra 1 and Ra 2 are arranged.
Close to the outside of Ra 1 and Ra 2 and the magnetic drum 1
a third and a fourth arranged parallel to the rotational movement direction of the
The magnetoresistive elements Rb 1 and Rb 2 are the hatch part,
That is, it consists of a main part extending parallel to the moving direction of the magnetic drum 1 and a short connecting part that connects these parts. Therefore, these magnetoresistive elements Rb 1 and Rb 2 are
Even if the magnetized part 5 passes through, the magnetic field is hardly felt. That is, the magnetoresistive element has B 1 ,
This is because only the magnetic field in the same plane as the magnetoresistive element R and in the direction perpendicular to the current J is detected, as shown by B2 .
これらの各磁気抵抗素子を図示のようにブリツ
ジ接続することにより磁気センサが形成される。
第４図にその回路図を示す。ブリツジ接続にして
あるために出力信号が大きくとれる。また、第４
図においてV1〜V2＝Voffをオフセツト電圧と呼
び、一般には温度によつて変化するが、この温度
依存性はできるだけ小さい方がよい。このような
オフセツト電圧の温度変化は、センサ上の温度分
布の変化による。したがつてセンサを構成する各
磁気抵抗素子Ra1，Ra2，Rb1，Rb2は、相互にで
きるだけ近接させた配置構成にすることが必要
で、実際には、第２図に示すようなパターンの配
置にする。 A magnetic sensor is formed by bridge-connecting these magnetoresistive elements as shown.
Figure 4 shows the circuit diagram. Because it is a bridge connection, a large output signal can be obtained. Also, the fourth
In the figure, V 1 to V 2 =Voff is called an offset voltage, and it generally changes depending on the temperature, but it is preferable that this temperature dependence be as small as possible. Such a temperature change in the offset voltage is due to a change in the temperature distribution on the sensor. Therefore, the magnetoresistive elements Ra 1 , Ra 2 , Rb 1 , and Rb 2 that make up the sensor must be arranged as close to each other as possible, and in reality, they are arranged as shown in Figure 2. Arrange the pattern.
さらに、第２図において、磁気抵抗素子Rb1，
Rb2のうちハツチングを施した部分のみ磁気抵抗
素子Ra1，Ra2と同じ物質で構成し、その他の部
分にさらに抵抗率の小さい物質を使用するように
すれば出力波形が改善できる。 Furthermore, in FIG. 2, the magnetoresistive elements Rb 1 ,
The output waveform can be improved by forming only the hatched portion of Rb 2 with the same material as the magnetoresistive elements Ra 1 and Ra 2 and using a material with lower resistivity for the other portions.
なお、磁気ドラム１の代わりに磁気デイスクを
用いてもよいことは言うまでもない。 It goes without saying that a magnetic disk may be used instead of the magnetic drum 1.
以上説明したように、本発明によれば、回転体
に基準点信号発生用の着磁部を設けるとともに、
これを同一平面上に近接して配置した２個ずつの
磁場を感ずる磁気抵抗素子とほとんど感じない磁
気抵抗素子とをブリツジ接続してなるセンサで検
出するようにしたことにより、基準点パルス幅が
安定で、かつオフセツト電圧の温度ドリフトも小
さい基準点付きの磁気式ロータリーエンコーダを
実現することができる。
As explained above, according to the present invention, the rotating body is provided with a magnetized portion for generating a reference point signal, and
By detecting this with a bridge-connected sensor consisting of two magnetoresistive elements that sense the magnetic field and two magnetoresistive elements that hardly feel the magnetic field, which are placed close to each other on the same plane, the reference point pulse width is It is possible to realize a magnetic rotary encoder with a reference point that is stable and has a small offset voltage temperature drift.
第１図は本発明の一実施例を示す構成図、第２
図は磁気センサの構成図、第３図はその回路図、
第４図は磁気抵抗素子の感磁特性を説明するため
の図である。
１……磁気ドラム、４……磁気センサ、５……
基準点信号発生用の着磁部、Ra1，Ra2……磁場
を感ずる方向に配置した磁気抵抗素子、Rb1，
Rb2……磁場をほとんど感じない磁気抵抗素子。
FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
The figure is a configuration diagram of the magnetic sensor, and Figure 3 is its circuit diagram.
FIG. 4 is a diagram for explaining the magnetic sensitivity characteristics of a magnetoresistive element. 1... Magnetic drum, 4... Magnetic sensor, 5...
Magnetized part for reference point signal generation, Ra 1 , Ra 2 ... Magnetoresistive element arranged in the direction of sensing the magnetic field, Rb 1 ,
Rb 2 ...A magnetoresistive element that hardly feels any magnetic field.
Claims (1)
る複数の信号用磁極と、周上の１点に配置された
基準点用磁極とからなる着磁部を有する回転体
と、前記着磁部に対して一定間隔をおいて離間配
置されている磁気センサとを備える磁気式ロータ
リーエンコーダにおいて、前記基準点用磁気セン
サは、前記回転体の回転移動方向に直交するよう
に並列近接配置された第１及び第２の磁気抗孔素
子と、前記第１及び第２の磁気抵抗素子の配置基
準と同じ基板上に、前記第１及び第２の磁気抵抗
素子の外側に近接しかつ前記回転体の回転移動方
向に平行に配置されるとともに、低抵抗材料を介
在させて全体的に蛇行形状をなすように接続され
た第３及び第４の非感磁型磁気抵抗素子とからな
つており、前記第１及び第２の磁気抵抗素子と前
記第３及び第４の非感磁型磁気抵抗素子とがブリ
ツジ接続され、このブリツジから検出出力が導出
されることを特徴とする磁気式ロータリーエンコ
ーダ。1. A rotating body having a magnetized portion consisting of a plurality of signal magnetic poles arranged on the entire circumference and having different magnetization directions alternately, and a reference point magnetic pole arranged at one point on the circumference; In the magnetic rotary encoder, the reference point magnetic sensors are arranged close to each other in parallel so as to be perpendicular to the rotational movement direction of the rotating body. on the same substrate as the arrangement reference of the first and second magnetoresistive elements, and adjacent to the outside of the first and second magnetoresistive elements and the It consists of third and fourth non-magnetism-sensitive magnetoresistive elements arranged parallel to the rotational movement direction of the rotating body and connected so as to form a meandering shape as a whole with a low resistance material interposed therebetween. A magnetic rotary rotary device, wherein the first and second magnetoresistive elements and the third and fourth non-magnetically sensitive magnetoresistive elements are bridge-connected, and a detection output is derived from the bridge. encoder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14630983A JPS6038615A (en) | 1983-08-12 | 1983-08-12 | Magnetic rotary encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14630983A JPS6038615A (en) | 1983-08-12 | 1983-08-12 | Magnetic rotary encoder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6038615A JPS6038615A (en) | 1985-02-28 |
| JPH052925B2 true JPH052925B2 (en) | 1993-01-13 |
Family
ID=15404757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14630983A Granted JPS6038615A (en) | 1983-08-12 | 1983-08-12 | Magnetic rotary encoder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6038615A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6234302A (en) * | 1985-08-08 | 1987-02-14 | Canon Electronics Inc | Encoder device |
| JP2532469B2 (en) * | 1987-05-28 | 1996-09-11 | 松下電器産業株式会社 | Steering shaft rotation angle detector |
| JP2627354B2 (en) * | 1990-07-23 | 1997-07-02 | 三洋電機株式会社 | Magnetic sensors and magnetic rotary encoders |
| EP2839247B1 (en) * | 2012-04-20 | 2016-11-09 | The Timken Company | Magnetic encoder for producing an index signal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5535203A (en) * | 1978-09-04 | 1980-03-12 | Tdk Corp | Multipolar magnetizing magnet disc |
| JPS5637507A (en) * | 1979-09-05 | 1981-04-11 | Hitachi Ltd | Revolution sensor |
-
1983
- 1983-08-12 JP JP14630983A patent/JPS6038615A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5535203A (en) * | 1978-09-04 | 1980-03-12 | Tdk Corp | Multipolar magnetizing magnet disc |
| JPS5637507A (en) * | 1979-09-05 | 1981-04-11 | Hitachi Ltd | Revolution sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6038615A (en) | 1985-02-28 |
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