JPH0520972Y2 - - Google Patents
Info
- Publication number
- JPH0520972Y2 JPH0520972Y2 JP1985023851U JP2385185U JPH0520972Y2 JP H0520972 Y2 JPH0520972 Y2 JP H0520972Y2 JP 1985023851 U JP1985023851 U JP 1985023851U JP 2385185 U JP2385185 U JP 2385185U JP H0520972 Y2 JPH0520972 Y2 JP H0520972Y2
- Authority
- JP
- Japan
- Prior art keywords
- magnetoresistive elements
- series
- magnetoresistive
- magnetoresistive element
- rotating body
- 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
- 230000000694 effects Effects 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Description
【考案の詳細な説明】
考案の技術分野
本考案は、磁気抵抗効果素子を用いた、例えば
ハイブリツドステツピングモータの変位を検知す
るための装置に関する。[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a device for detecting displacement of, for example, a hybrid stepping motor, using a magnetoresistive element.
従来技術
一般に、この種の磁気抵抗効果素子は、直列に
接続され、差動型として用いられる。このような
差動型のものでは、出力信号が変位に対し直線性
の良い状態で得られ、また抵抗の温度変化が補正
される。しかし、このような差動式のものでも、
例えば、ステツピングモータに組み込まれると、
充分なレベルの信号レベルが得られず、また温度
補正も不充分となる。PRIOR ART Generally, this type of magnetoresistance effect element is connected in series and used as a differential type. In such a differential type, the output signal is obtained with good linearity with respect to the displacement, and the temperature change of the resistance is compensated for. However, even in such a differential type,
For example, when incorporated into a stepping motor,
A sufficient signal level cannot be obtained, and temperature compensation is also insufficient.
考案の目的およびその解決手段
したがつて、本考案の目的は、この種の磁気抵
抗効果素子を複数用いて、被検体の変位を大きな
信号レベルで検出し、またその出力信号を温度の
変化に対し安定化することである。Purpose of the invention and means for solving the problem Therefore, the purpose of the invention is to detect the displacement of an object at a large signal level by using a plurality of magnetoresistive elements of this type, and to change the output signal to changes in temperature. The goal is to stabilize the situation.
そこで、本考案は、この種の磁気抵抗効果素子
を直列に接続し、これらの磁気抵抗効果素子を被
検体としてのロータなどの極歯のピツチに対し所
定の関係でずらして配置することにより、それら
の接続点の中点部分で大きな信号差を得るように
している。 Therefore, the present invention connects this type of magnetoresistive effect elements in series and arranges these magnetoresistive effect elements in a predetermined relationship with respect to the pitch of the pole teeth of a rotor or the like as an object. A large signal difference is obtained at the midpoint between these connection points.
考案の構成
以下、本考案の構成を図面に基づいて具体的に
説明する。Configuration of the invention Hereinafter, the configuration of the invention will be specifically explained based on the drawings.
この実施例は、本考案の磁気抵抗効果素子装置
１をハイブリツド型のステツピングモータ２に組
み込んだ例を示している。 This embodiment shows an example in which a magnetoresistive element device 1 of the present invention is incorporated into a hybrid stepping motor 2.
このステツピングモータ２のステータ３は内周
部分で、例えば４つのポール４を形成しており、
その部分で励磁コイル５を備えている。一方、ス
テツピングモータ２の一対のロータコア６は、一
対の回転体であつて、被検体を構成しており、永
久磁石７をはさみ込んだ状態で、それとともに、
軸８に固定されている。なおこの永久磁石７は、
極歯６ａはＮ極に、また極歯６ｂはＳ極になるよ
うに着磁されている。そして、この軸８は、ケー
ス９の軸受け部１０に対し、回転自在に支持され
ている。このロータコア６は、軟磁性材によつて
構成されており、その外周部分で極歯６ａ，６ｂ
を一体的に形成している。これらの極歯６ａ，６
ｂは、永久磁石７の磁極に応じ、NS極に着磁さ
れ、半周期、つまり半ピツチだけずれた状態で組
み合わされており、ポール４の極歯４ｃと対向し
ている。 The stator 3 of this stepping motor 2 has, for example, four poles 4 formed at its inner peripheral portion.
An excitation coil 5 is provided at that portion. On the other hand, the pair of rotor cores 6 of the stepping motor 2 are a pair of rotating bodies and constitute a test object, with a permanent magnet 7 sandwiched between them.
It is fixed to the shaft 8. Note that this permanent magnet 7 is
The pole teeth 6a are magnetized to be N poles, and the pole teeth 6b are magnetized to S poles. The shaft 8 is rotatably supported by a bearing portion 10 of the case 9. This rotor core 6 is made of a soft magnetic material, and has pole teeth 6a, 6b at its outer peripheral portion.
are integrally formed. These pole teeth 6a, 6
b is magnetized to the NS pole according to the magnetic pole of the permanent magnet 7, and is assembled with a shift of half a period, that is, a half pitch, and faces the pole teeth 4c of the pole 4.
そして磁気抵抗効果素子装置１は、ポール４の
間で、極歯６ａ，６ｂと対向している。 The magnetoresistive element device 1 is located between the poles 4 and faces the pole teeth 6a and 6b.
次に、第３図は、極歯６ａ，６ｂとの関係で、
磁気抵抗効果素子１１，１２…１８の配置関係お
よび接続状態を示している。 Next, FIG. 3 shows the relationship between the pole teeth 6a and 6b.
The arrangement relationship and connection state of magnetoresistive elements 11, 12, . . . , 18 are shown.
磁気抵抗効果素子１１，１３、磁気抵抗効果素
子１２，１４は、互いに直列に接続されており、
また磁気抵抗効果素子１５，１７、磁気抵抗効果
素子１６，１８は、同様に、互いに直列に接続さ
れている。そしてこれらのもののうち磁気抵抗効
果素子１１，１３，１５，１７は、Ｎ極の極歯６
ａと対向しており、隣合う磁気抵抗効果素子１
１，１３の間隔および磁気抵抗効果素子１５，１
７の間隔は、極歯６ａ，６ｂの周期つまりピツチ
をＰとしたとき、1/2Ｐだけずれた状態で設けら
れており、また、磁気抵抗効果素子１３，１５の
間隔は、1/4Ｐだけずれている。また、磁気抵抗
効果素子１２，１４，１６，１８は、極歯６ｂと
対向しており、上記と同様なずれの関係で設けら
れている。 The magnetoresistive elements 11 and 13 and the magnetoresistive elements 12 and 14 are connected in series with each other,
Similarly, the magnetoresistive elements 15 and 17 and the magnetoresistive elements 16 and 18 are connected in series with each other. Of these, the magnetoresistive elements 11, 13, 15, 17 have N pole teeth 6.
Adjacent magnetoresistive element 1 facing a
1, 13 and magnetoresistive elements 15, 1
The spacing between the pole teeth 6a and 6b is 1/2P, and the spacing between the magnetoresistive elements 13 and 15 is 1/4P. It's off. Further, the magnetoresistive elements 12, 14, 16, and 18 face the pole teeth 6b, and are provided with the same offset relationship as described above.
さらに、磁気抵抗効果素子１１，１３の接続中
点および他方の磁気抵抗効果素子１２，１４の接
続中点は、それぞれ一方の差動増幅器２１の２つ
の入力端に接続されており、また、磁気抵抗効果
素子１５，１７、および磁気抵抗効果素子１６，
１８の接続中点は、同様に他方の差動増幅器２２
の入力端に接続されている。また、磁気抵抗効果
素子１１，１２の接続点および磁気抵抗効果素子
１７，１８の接続点はともに電源２０のプラス側
に接続されており、また磁気抵抗効果素子１３，
１４，１５，１６の中間の接続点は、電源２０の
マイナス側に共通に接続されている。 Furthermore, the connection midpoint of the magnetoresistive elements 11 and 13 and the connection midpoint of the other magnetoresistive element 12 and 14 are respectively connected to two input terminals of one differential amplifier 21, and the magnetic Resistance effect elements 15, 17, and magnetoresistive effect element 16,
Similarly, the connection midpoint of 18 is connected to the other differential amplifier 22.
is connected to the input end of the Further, the connection point between the magnetoresistive elements 11 and 12 and the connection point between the magnetoresistive elements 17 and 18 are both connected to the positive side of the power supply 20, and the magnetoresistive elements 13 and
The intermediate connection points 14, 15, and 16 are commonly connected to the negative side of the power source 20.
考案の作用
次に、上記磁気抵抗効果素子装置１の作用を説
明する。Function of the invention Next, the function of the magnetoresistive element device 1 will be explained.
例えば第３図のように、磁気抵抗効果素子１１
がＮ極と対向しているとき、その磁気抵抗効果素
子１１の抵抗は最大となる。このとき、磁気抵抗
効果素子１３が極歯６ａの中間、すなわち溝部分
と対向しているため、その抵抗値は最小となる。
したがつてこれらの磁気抵抗効果素子１１，１３
の出力点での信号A1のレベルは最小となる。 For example, as shown in FIG.
When the magnetoresistive element 11 faces the north pole, the resistance of the magnetoresistive element 11 becomes maximum. At this time, since the magnetoresistive element 13 faces the middle of the pole tooth 6a, that is, the groove portion, its resistance value becomes minimum.
Therefore, these magnetoresistive elements 11, 13
The level of signal A 1 at the output point of is the minimum.
一方、磁気抵抗効果素子１１がＮ極と対応して
いるとき、磁極抵抗効果素子１２は、Ｓ極の中
間、すなわち溝部分にあるため、その磁気抵抗効
果素子１２の抵抗は最小となる。このとき、磁気
抵抗効果素子１４がＳ極と対向しているため、そ
の抵抗値は最大となる。したがつて、磁気抵抗効
果素子１２，１４の接続中点での信号A2のレベ
ルは、最大となる。 On the other hand, when the magnetoresistive element 11 corresponds to the N pole, the magnetoresistive element 12 is located in the middle of the S pole, that is, in the groove portion, so the resistance of the magnetoresistive element 12 is minimum. At this time, since the magnetoresistive element 14 faces the S pole, its resistance value becomes maximum. Therefore, the level of the signal A 2 at the midpoint of the connection between the magnetoresistive elements 12 and 14 becomes maximum.
この結果、差動増幅器２１の入力側に、大きな
差の信号が入力されるため、差動増幅器２１は、
その差を増幅し、大きな信号レベルの出力Ａを発
生する。このような関係は、他の出力信号B1，
B2についても同様である。このときの信号Ｂは、
第４図に示すようにＰ／４だけ位相のずれた信号
となつている。 As a result, a signal with a large difference is input to the input side of the differential amplifier 21, so the differential amplifier 21
The difference is amplified to generate output A with a large signal level. Such a relationship applies to other output signals B 1 ,
The same applies to B2 . Signal B at this time is
As shown in FIG. 4, the signals are shifted in phase by P/4.
ここで、ロータコア６の回転変位は、一方の出
力信号、例えば出力信号Ａのみによつて検出でき
るが、その回転方向の検出は、位相のずれた他方
の出力信号Ｂを必要とする。したがつて、回転量
のみを知る場合には、少なくとも４つ例えば磁気
抵抗効果素子１１，１２，１３，１４があれば充
分である。 Here, the rotational displacement of the rotor core 6 can be detected using only one output signal, for example, the output signal A, but the detection of the rotation direction requires the other output signal B with a phase shift. Therefore, when only the amount of rotation is known, it is sufficient to have at least four magnetoresistive elements, for example, magnetoresistive elements 11, 12, 13, and 14.
考案の変形例
第３図の回路で、磁気抵抗効果素子１１と磁気
抵抗効果素子１４、磁気抵抗効果素子１２と磁気
抵抗効果素子１３、または、磁気抵抗効果素子１
５と磁気抵抗効果素子１８、磁気抵抗効果素子１
６と磁気抵抗効果素子１７と交換しても、同様の
効果が得られる。また、電源２０の極性は、図示
のものと逆の関係にあつてもよい。Modification of the invention In the circuit shown in FIG.
5, magnetoresistive element 18, magnetoresistive element 1
Even if the magnetoresistive element 6 is replaced with the magnetoresistive element 17, the same effect can be obtained. Additionally, the polarities of the power source 20 may be reversed from those shown.
さらに、この磁気抵抗効果素子１１，１２…１
８は、第５図のように配置してもよい。 Furthermore, the magnetoresistive elements 11, 12...1
8 may be arranged as shown in FIG.
ちなみにこれらの磁気抵抗効果素子１１，１２
…１８は、直線特性を得るために、直流バイアス
磁界が必要とされるが、ハイブリツド型のステツ
ピングモータ２では、永久磁石７が常に一定の直
流の磁界がそれらに作用させているため、特別な
バイアス用の磁石がなくても、それらの出力が直
線特性の範囲で利用できる。しかし、必要なら
ば、基板１９の背面側に直流バイアス用の永久磁
石を組み込んでもよい。 By the way, these magnetoresistive elements 11 and 12
...18 requires a DC bias magnetic field in order to obtain linear characteristics, but in the hybrid stepping motor 2, the permanent magnets 7 always have a constant DC magnetic field acting on them, so there is a special Even without a bias magnet, their output can be used within the linear characteristic range. However, if necessary, a permanent magnet for DC bias may be incorporated on the back side of the substrate 19.
考案の効果
本考案では、直列に接続された磁気抵抗効果素
子の間で大きな出力と、小さな出力とが常に同時
に得られるため、それらの差動出力が大きくな
り、また対応の磁気抵抗効果素子が温度変化の影
響を受けたとしても、直列に接続された磁気抵抗
効果素子の分圧出力を出力信号としたので、温度
変化の影響は、直列に接続された磁気抵抗効果素
子の間で互いに相殺され、出力信号を温度変化の
影響に対し安定化することができ、しかも、それ
らの磁気抵抗効果素子が近接して、ほぼ同じ温度
雰囲気下にあるため、内部温度が変化しても、そ
の出力レベルに大きな変化が無くなる。Effects of the invention In this invention, a large output and a small output are always obtained simultaneously between the magnetoresistive elements connected in series, so the differential output between them becomes large, and the corresponding magnetoresistive element Even if it is affected by temperature changes, the output signal is the divided voltage output of the magnetoresistive elements connected in series, so the effects of temperature changes are canceled out between the magnetoresistive elements connected in series. The output signal can be stabilized against the effects of temperature changes, and since the magnetoresistive elements are in close proximity and in an atmosphere with approximately the same temperature, the output signal remains stable even if the internal temperature changes. There will be no major changes in level.
特に、本考案では、磁気抵抗効果素子が一対の
回転体に対して軸方向に一致する位置関係で配置
されているため、磁気抵抗効果素子を横方向に一
線上に配置するものに比較して、配置距離が短く
なるため、温度変化による磁気抵抗効果素子の熱
変形の影響を少なくでき、センサー信号の位相変
動を低く抑えられる。 In particular, in the present invention, the magnetoresistive elements are arranged in the same positional relationship in the axial direction with respect to the pair of rotating bodies. Since the arrangement distance is shortened, the influence of thermal deformation of the magnetoresistive element due to temperature changes can be reduced, and phase fluctuations of the sensor signal can be suppressed.
第１図は、ステツピングモータによる磁気抵抗
効果素子装置の一部の平面図、第２図はその断面
図、第３図は磁気抵抗効果素子装置の回路図、第
４図は信号の波形図、第５図は他の実施例での接
続状態を示す回路図である。
１……磁気抵抗効果素子装置、２……ステツピ
ングモータ、３……ステータ、４……ポール、５
……励磁コイル、６……ロータコア、６ａ，６ｂ
……極歯、７……永久磁石、８……軸、１１，１
２…１８……磁気抵抗効果素子、２０……電源、
２１，２２……差動増幅器。
Fig. 1 is a plan view of a part of a magnetoresistive element device using a stepping motor, Fig. 2 is a sectional view thereof, Fig. 3 is a circuit diagram of the magnetoresistive element device, and Fig. 4 is a signal waveform diagram. , FIG. 5 is a circuit diagram showing a connection state in another embodiment. DESCRIPTION OF SYMBOLS 1... Magnetoresistive element device, 2... Stepping motor, 3... Stator, 4... Pole, 5
... Excitation coil, 6 ... Rotor core, 6a, 6b
...Pole tooth, 7...Permanent magnet, 8...Shaft, 11,1
2...18... Magnetoresistive element, 20... Power supply,
21, 22...Differential amplifier.
Claims (1)
転体を軸方向に間隔を隔てかつ上記一対の回転体
の磁極を回転方向で1/2周期ずらして配置した被
検体と、４つの磁気抵抗効果素子とからなり、各
回転体と対向する位置の２つの磁気抵抗効果素子
を対応の回転体に対して1/2周期ずらされており、
かつ各回転体に対応する２つの磁気抵抗効果素子
を軸方向に一致する状態で配置し、 一方の回転体に対応する２つの磁気抵抗効果素
子を直列に接続し、直列接続の磁気抵抗効果素子
の両端に電源を接続し、また直列接続の磁気抵抗
効果素子の接続中点を差動増幅器の一方の入力端
に接続し、 また他方の回転体に対応する２つの磁気抵抗効
果素子を直列に接続し、直列接続の磁気抵抗効果
素子の両端に電源を接続し、直列接続の磁気抵抗
効果素子の接続中点を上記差動増幅器の他方の入
力端に接続してなることを特徴とする磁気抵抗効
果素子装置。[Claims for Utility Model Registration] A cover comprising a pair of rotating bodies having a plurality of magnetic poles spaced equally apart in the rotational direction, spaced apart in the axial direction, and with the magnetic poles of the pair of rotating bodies shifted by 1/2 cycle in the rotational direction. It consists of a specimen and four magnetoresistive elements, and the two magnetoresistive elements facing each rotating body are shifted by 1/2 period with respect to the corresponding rotating body,
and the two magnetoresistive elements corresponding to each rotating body are arranged so as to coincide in the axial direction, and the two magnetoresistive elements corresponding to one of the rotating bodies are connected in series, and the series-connected magnetoresistive elements are connected in series. A power supply is connected to both ends of the magnetoresistive element, the midpoint of the connection of the series-connected magnetoresistive elements is connected to one input terminal of the differential amplifier, and two magnetoresistive elements corresponding to the other rotating body are connected in series. a power supply is connected to both ends of the series-connected magnetoresistive elements, and a connection midpoint of the series-connected magnetoresistive elements is connected to the other input terminal of the differential amplifier. Resistance effect element device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985023851U JPH0520972Y2 (en) | 1985-02-20 | 1985-02-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985023851U JPH0520972Y2 (en) | 1985-02-20 | 1985-02-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61139416U JPS61139416U (en) | 1986-08-29 |
| JPH0520972Y2 true JPH0520972Y2 (en) | 1993-05-31 |
Family
ID=30517461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985023851U Expired - Lifetime JPH0520972Y2 (en) | 1985-02-20 | 1985-02-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0520972Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5690213A (en) * | 1979-12-24 | 1981-07-22 | Nec Corp | Position detector |
-
1985
- 1985-02-20 JP JP1985023851U patent/JPH0520972Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5690213A (en) * | 1979-12-24 | 1981-07-22 | Nec Corp | Position detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61139416U (en) | 1986-08-29 |
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