JPS5972017A - Frequency generator - Google Patents

Frequency generator

Info

Publication number
JPS5972017A
JPS5972017A JP18142082A JP18142082A JPS5972017A JP S5972017 A JPS5972017 A JP S5972017A JP 18142082 A JP18142082 A JP 18142082A JP 18142082 A JP18142082 A JP 18142082A JP S5972017 A JPS5972017 A JP S5972017A
Authority
JP
Japan
Prior art keywords
elements
rotor
frequency
magnetic poles
pitch
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.)
Pending
Application number
JP18142082A
Other languages
Japanese (ja)
Inventor
Kyoichi Shirane
白根　京一
Hiroshi Takino
浩 瀧野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sony Corp filed Critical Sony Corp
Priority to JP18142082A priority Critical patent/JPS5972017A/en
Publication of JPS5972017A publication Critical patent/JPS5972017A/en
Pending legal-status Critical Current

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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
    • G01D5/243—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 phase or frequency of AC

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

PURPOSE:To improve the detection precision of rotational variation of a rotating body by arranging plural magneto-resistance (MR) elements near the magnetized rotating body and obtaining frequency signals corresponding to respective intervals of the elements. CONSTITUTION:This frequency generator has an annular rotor 1 and an annular stator 2 having the rotor 1 within, and plural magnetic poles N and S are magnetized at the outer circumference of the rotor 1 at circumferentially equal intervals. Plural MR elements A1-An are provided on the top surface 2A of the stator 2 at circumferentially equal intervals opposite to the magnetic poles N and S. The MR element An is a magnetic flux response type element. The pitch P4 of the element An is less than the pitch P5 of the magnetic poles N and S. When the rotor 1 is driven to rotate, an output of frequency corresponding to the number N of the MR elements An is obtained. It is easy to correct the phase to frequency determined by the number N of the MR elements without lowering the precision electrically, and consequently rotational variation is detected precisely.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、モータ等の回転変動を検出する周波数発電機
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a frequency generator that detects rotational fluctuations of a motor or the like.

〔背景技術とその問題点〕[Background technology and its problems]

従来より、第１図に示す如き周波数発電機が知られてい
る。この発電機は、有底筒状のステーク５０と、このス
テーク５０の底部５１に回転自在に立設したローフ５２
とを有してなる。上記ローフ５２は軸状のマグネット５
３と、このマグネット５３の上端に一体形成された回転
板５４とからなり、上記回転板５４の外周部には複数の
第１の歯部５５，５５．・・・が周方向に等間隔に形成
されてなる。そして、上記ステーク５０の上端には上記
各歯部５５，５５．・・・と所定の隙間Ｓを隔てて径方
向に対向する複数の第２の歯部５６，５６゜・・・が周
方向に等間隔に形成されている。なお、上記ステータ５
０の底部５１には上記マグネット５３を内装するように
検出コイル５７が固定されている。Conventionally, a frequency generator as shown in FIG. 1 has been known. This generator includes a bottomed cylindrical stake 50 and a loaf 52 rotatably installed on the bottom 51 of the stake 50.
It has the following. The loaf 52 is a shaft-shaped magnet 5
3 and a rotary plate 54 integrally formed on the upper end of the magnet 53, and the rotary plate 54 has a plurality of first teeth 55, 55. ... are formed at equal intervals in the circumferential direction. The upper end of the stake 50 is provided with the teeth 55, 55. A plurality of second tooth portions 56, 56°, . In addition, the stator 5
A detection coil 57 is fixed to the bottom 51 of the 0 so that the magnet 53 is housed therein.

上記ローフ５２は、例えば図示しないモータの回転子に
連結され、上記モータの回転駆動によってローフ５２、
すなわち第１の歯部５５，５５゜・・・が第２図Ａ、Ｂ
に示す如く同図中矢印へ方向に回転すると、上記第１の
歯部５５，５５．・・、及び第２の歯部５６　、５６　
、・・・のギャップが０１からＧ２に変化する。このギ
ャップの変化によって得られる磁束の変化に応じて、第
３図に示す如き周波数の出力が得られる。そして、この
周波数の出力によって上記モータの回転子の回転変動を
検出するように構成されている。The loaf 52 is connected, for example, to a rotor of a motor (not shown), and the loaf 52 is driven by rotation of the motor.
That is, the first tooth portions 55, 55°... are as shown in Fig. 2 A and B.
When rotated in the direction of the arrow in the figure as shown in , the first tooth portions 55, 55 . ..., and second tooth portions 56 , 56
,... changes from 01 to G2. Depending on the change in magnetic flux obtained by the change in the gap, an output frequency as shown in FIG. 3 is obtained. The apparatus is configured to detect rotational fluctuations of the rotor of the motor based on the output of this frequency.

ところで、上記回転子の回転変動を精度良く検出するた
めには、上記各歯部５５，５６のピッチＰ　１．　Ｉ’
　２を細かく形成し、周波数を高くすることにより実現
されるものであるが、上記各歯部５５．５６のピッチＰ
ｌ　、Ｐ２を細かく形成する機械加工には限度が有り、
例えば小径のモータ等に内蔵されるものにあっては、高
々１０数歯といったものしか形成することができなかっ
た。By the way, in order to accurately detect rotational fluctuations of the rotor, it is necessary to adjust the pitch P1 of each of the teeth 55 and 56. I'
This is achieved by forming the tooth portions 55 and 56 finely and increasing the frequency.
There is a limit to machining to form P2 finely.
For example, in the case of a device built into a small-diameter motor, it has been possible to form only about 10 or so teeth at most.

また、第４図に示す如き周波数発電機のように、ローフ
５８の外周部に複数の磁極Ｎ、Ｓを周方向に等間隔に着
磁形成してなるものがあるが、上記磁極Ｎ、Ｓを着磁形
成するためには、電磁石５９等を用いなければならず、
上記磁極Ｎ、ＳのピッチＰ３は上記電磁石５９の大きさ
で決定されるものであり、その着磁個数を増加すること
には電磁石５９の加工上限界があるものである。Further, there is a frequency generator as shown in FIG. 4, in which a plurality of magnetic poles N and S are magnetized and formed at equal intervals in the circumferential direction on the outer periphery of the loaf 58. In order to magnetize and form, an electromagnet 59 etc. must be used,
The pitch P3 of the magnetic poles N and S is determined by the size of the electromagnet 59, and there is a limit in processing the electromagnet 59 to increase the number of magnetized pieces.

また、図示は省略するがローフ仰１に形成した被検出部
に光を照射することにより、上記モータの回転子の回転
変動を検出するようにした周波数発電機もあるが、この
場合にはノイズが多くなることが欠点となっていた。Although not shown in the figure, there is also a frequency generator that detects rotational fluctuations of the rotor of the motor by irradiating light onto a detected part formed at the loaf height 1, but in this case, noise The disadvantage was that there were many.

〔発明の目的〕[Purpose of the invention]

そこで、本発明はこのような従来の実情に鑑みて提案し
たものであり、回転体の回転変動を精度よく検出し得る
新規な周波数発電機を提供することを目的とする。The present invention has been proposed in view of the above-mentioned conventional situation, and an object of the present invention is to provide a novel frequency generator that can accurately detect rotational fluctuations of a rotating body.

〔発明の概要〕[Summary of the invention]

上記目的を達成するために、本発明は着磁された回転体
の近傍に複数の磁気抵抗素子を配置し、上記各素子の間
隔に応じた周波数信号を得るようにしたことを特徴とす
るものである。In order to achieve the above object, the present invention is characterized in that a plurality of magnetoresistive elements are arranged near a magnetized rotating body, and a frequency signal is obtained according to the spacing between the respective elements. It is.

〔実施例〕〔Example〕

以下、本発明の好適な実施例を図面に基づき具体的に説
明する。Hereinafter, preferred embodiments of the present invention will be specifically described based on the drawings.

第５図は本発明の一実施例を示す要部概略斜視図、第６
図はその平面図、第７図はその断面図である。この周波
数発電機は、リング状のローフ１と、このローフ１を内
装するように配置された例えばガラス材からなるリング
状のステーク２を有してなる。上記ローフ１の外周部に
は、複数の磁極Ｎ、Ｓが周方向に等間隔に着磁形成され
ている。FIG. 5 is a schematic perspective view of main parts showing one embodiment of the present invention, and FIG.
The figure is a plan view thereof, and FIG. 7 is a sectional view thereof. This frequency generator includes a ring-shaped loaf 1 and a ring-shaped stake 2 made of a glass material, for example, and arranged so as to house the loaf 1 therein. On the outer periphery of the loaf 1, a plurality of magnetic poles N and S are magnetized and formed at equal intervals in the circumferential direction.

また、上記ステーク２の上面２人には、上記磁極Ｎ、Ｓ
と対向するように複数の磁気抵抗素子（以下、ＭＲ素子
という。）、Ａ＋　、Ａ２、−、Ａ＋１が周方向に等間
隔を置いて被着形成されている。上記ＭＲ素子Ａｎは、
磁束応答型の素子であり、磁束に応じて素子の電気抵抗
が変化するものである。In addition, the two upper surfaces of the stake 2 are provided with the magnetic poles N and S.
A plurality of magnetoresistive elements (hereinafter referred to as MR elements), A+, A2, -, and A+1, are formed at equal intervals in the circumferential direction so as to face each other. The above MR element An is
It is a magnetic flux responsive element, and the electrical resistance of the element changes depending on the magnetic flux.

なお、上記素子ＡｎのピッチＰ４は、上記磁極Ｎ。Note that the pitch P4 of the element An is the magnetic pole N.

ＳのピッチＰ５よりも小さく形成されている。そして、
上記素子Ａｎの個数Ｎは、薄膜技術により、例えば上記
ステーク２の直径Ｒが５ｍｍの小径なものであっても、
１００個程度得ることができるようになっており、その
ピッチＰ４を１００μｍ程度の微細なものとすることが
できる。The pitch is smaller than the pitch P5 of S. and,
The number N of the elements An can be determined by thin film technology, even if the stake 2 has a small diameter R of 5 mm, for example.
About 100 pieces can be obtained, and the pitch P4 can be made as fine as about 100 μm.

なお、上記ＭＲ素子Ａｎの単一素子の動作曲線を第８図
に示す。この第８図において、横軸は磁界を示し、縦軸
は発電機の出力を示すものであり、Ｂはバイアス点を示
す。Incidentally, the operating curve of a single element of the above-mentioned MR element An is shown in FIG. In FIG. 8, the horizontal axis shows the magnetic field, the vertical axis shows the output of the generator, and B shows the bias point.

となっている。そして、上記ローフ１が回転駆動される
と、第９図に示すようにローフ１の径方向の磁界の成分
ｍｌはＭＲ素子Ａｎと対向する部分（同図中実線で示す
）とＭＲ素子Ａｎ間と対向する部分（同図中破線で示す
）とで得られ、これら各部分でのＭＲ素子Ａｎ群の抵抗
値が異なり、ＭＲ素子Ａｎの個数Ｎの周波数での出力が
得られる。It becomes. When the loaf 1 is rotationally driven, as shown in FIG. 9, the magnetic field component ml in the radial direction of the loaf 1 changes between the portion facing the MR element An (indicated by the solid line in the figure) and the MR element An. and an opposing portion (indicated by a broken line in the figure), and the resistance values of the MR element An group at each portion are different, and an output at a frequency corresponding to the number N of MR elements An is obtained.

なお、第１０図は、この実施例における出力ａ１の波形
図である。また、上記ＭＲ素子ＡＩ　、　Ａ２　。Note that FIG. 10 is a waveform diagram of the output a1 in this embodiment. Moreover, the above-mentioned MR elements AI and A2.

・・・、　Ａｎはステーク２の全周に配置されているの
で、上記ローフ１との同心の狂い、微小な着磁ムラ等は
検出精度に影響しない。..., Since An is arranged around the entire circumference of the stake 2, misalignment with the loaf 1, minute magnetization unevenness, etc. do not affect the detection accuracy.

なロータ１の径方向の磁界の成分ｍ２が得らに％　％例
えば第１（７）Ｍｌ七素子Ａｌと第３のＭＲ素子Ａ３と
の出力の４’Ｍ性が逆になってしまい出力が得られなく
なってしまう。The component m2 of the magnetic field in the radial direction of the rotor 1 is %.For example, the 4'M characteristics of the outputs of the first (7) Ml seven elements Al and the third MR element A3 are reversed, and the output is You will no longer be able to obtain it.

そこで、第１２図に示すように上記各ＭＲ，素子ｋｌ、
　Ａ２　、・・・、Ａｎを一つ置きに結線し、同一方向
磁界に対して同一グループの素子群、すなわち第１のグ
ループＡ　ｌ＋　Ａ３＋・・・ｒ　Ａｎと第２のグルー
プＡ　２　＋　Ａ　４　　＋・・・、Ａ４−＋が感応す
るように分割し、これら各グループの素子をＡ　ｒ　＋
　Ａ　３　　＋Ａ２．・・・、八〇を結線することによ
り、第１３図に示すようなロータ１の径方向の磁界の成
分ｍ３が得られ、第１４図に示すように上記各グループ
の素子Ａ　ｒ、　Ａ３　、＋・＋、　Ａｎ１Ａ２．　Ａ
４　、＋＋＋。Therefore, as shown in FIG. 12, each MR, element kl,
A2, . +..., A4-+ is sensitive, and the elements of each group are A r +
A3 +A2. ..., 80, the component m3 of the magnetic field in the radial direction of the rotor 1 as shown in FIG. +・+, An1A2. A
4, +++.

Ａ、、より全ＭＲ素子数Ｎの半分の周波数の出力が得ら
れる。なお、同図中、ａ２は第１のグループＡ、　　、
　Ａ、３、−、　Ａｎの出力、ａ３は第２のグループＡ
２　、　Ａ４　　、・・・、Ａｎ−＋の出力を示す。た
だし、上記各グループＡｌ　、　Ａ３　　、　・、、　
Ａｎ　、　Ａ２　、Ａ４゜・・・、Ａｎ−１で位相が］
８０異なっている。しかし、上記位相を電気的に精度を
おとすことなく、全ＭＲ素子数Ｎで決定される周波数に
補正するこ乏は容易である。A. An output with a frequency that is half of the total number of MR elements N can be obtained. In addition, in the same figure, a2 is the first group A, ,
A,3,−, the output of An, a3 is the second group A
2, A4, ..., An-+ outputs are shown. However, each of the above groups Al, A3, .
An, A2, A4゜..., the phase is An-1]
80 different. However, it is easy to correct the phase to the frequency determined by the total number N of MR elements without reducing the electrical accuracy.

また、第１５図及び第１６図に示すように、ロータ３の
径方向に磁極Ｎ、Ｓを着磁したものをロータ３の周方向
に着磁されない部分４を間に置き等間隔に配列し、同一
方向の磁界が外に現れるようにすれば、ＭＲ素子ｋｌ、
　Ａ２　　、・・・、Ａｎを上記ロータ３の軸方−側面
３Ａ側に配置したステーク５上に直列に結線にした状態
で配置することが可能である。このように、上記磁極Ｎ
、Ｓを着磁することにより、第１７図に示すようなロー
タ３の径方向の磁界の成分ｍ４が得られ、全ＭＲ素子数
Ｎの周波数の出力が得られるようになる。Furthermore, as shown in FIGS. 15 and 16, magnetic poles N and S are magnetized in the radial direction of the rotor 3 and arranged at equal intervals with a portion 4 that is not magnetized in the circumferential direction of the rotor 3 between them. , if a magnetic field in the same direction appears outside, the MR element kl,
It is possible to arrange A2, . In this way, the magnetic pole N
, S, a component m4 of the magnetic field in the radial direction of the rotor 3 as shown in FIG. 17 is obtained, and an output with a frequency corresponding to the total number of MR elements N can be obtained.

〔発明の効果〕〔Effect of the invention〕

このよ・）に、本発明によれば、ＭＲ素子を薄膜技術に
より、微細なピッチ（例えば１（１０μｍ）をもって精
度良く配列するこ乏ができ、上記ピッチに応じた周波数
を高くすることができる。したがって、回転変動を精度
良く検出することができる。In this way, according to the present invention, MR elements can be precisely arranged with a fine pitch (for example, 1 (10 μm)) using thin film technology, and the frequency can be increased according to the pitch. Therefore, rotational fluctuations can be detected with high accuracy.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は従来例を示す断面図、第２図はロータ及びステ
ータの各歯部の部分を展開して示した拡大断面図であり
、第２図Ａ及び第２図Ｂは上記各歯部間のギャップが異
なる場合を示す図、第３図はその出力を示す波形図、第
４図は上記ロータへの着磁方法を示す平面図、第５図は
本発明の一実施例を示す要部概略斜視図、第６図はその
平面図、第７図はその断面図、第８図はＭＲ素子の動作
曲線を示すグラフ図、第９図はＭＲ素子にバイアス磁界
を印加しないときの検出状態を示す模式図、第１Ｏ図は
その出力を示す波形図、第１１図はＭＲ素子にバイアス
磁界を印加したときの模式図）第１２図は本発明の他の
実施例を示すステークの平面図、第１３図はＭＲ素子に
バイアス磁界を印加したときの検出状態を示す模式図、
第１４図はその出力を示す波形図、第１５図は本発明の
さらに他の実施例を示す平面図、第１６図はその断面図
、第１７図はＭＲ素子にバイアス磁界を印加したときの
検出状態を示す模式図である。 １．３・・・ロータ、２・・・ステーク、Ａｌ　、　Ａ
２　、　・・・、　Ａ、１・・・磁気抵抗素子 特許出願人　ソニー株式会社 代理人　弁理士　小　池　　　晃 同　　　　１）　利　　榮　　− −９９− 第１６図 第１７図FIG. 1 is a cross-sectional view showing a conventional example, FIG. 2 is an enlarged cross-sectional view showing the teeth of the rotor and stator, and FIGS. 2A and 2B are the teeth of the rotor and stator. 3 is a waveform diagram showing the output, FIG. 4 is a plan view showing the method of magnetizing the rotor, and FIG. 5 is a diagram showing an embodiment of the present invention. 6 is a plan view thereof, FIG. 7 is a sectional view thereof, FIG. 8 is a graph showing the operating curve of the MR element, and FIG. 9 is a detection when no bias magnetic field is applied to the MR element. Fig. 10 is a schematic diagram showing the state, Fig. 10 is a waveform diagram showing the output, Fig. 11 is a schematic diagram when a bias magnetic field is applied to the MR element) Fig. 12 is a plane of a stake showing another embodiment of the present invention. 13 is a schematic diagram showing the detection state when a bias magnetic field is applied to the MR element,
FIG. 14 is a waveform diagram showing the output, FIG. 15 is a plan view showing still another embodiment of the present invention, FIG. 16 is a cross-sectional view thereof, and FIG. 17 is a waveform diagram showing the output when a bias magnetic field is applied to the MR element. FIG. 3 is a schematic diagram showing a detection state. 1.3... Rotor, 2... Stake, Al, A
2, ..., A, 1... Magnetoresistive element patent applicant Sony Corporation representative Patent attorney Koike Koike 1) Toshiei - -99- Figure 16 Figure 17

Claims (1)

【特許請求の範囲】 （１）着磁された回転体の近傍に複数の磁気抵抗素子を
配置し、上記容素子の間隔に応じた周波数信号を得るよ
うにした周波数発電機。 （２〕　　上記各磁気抵抗素子にバイアス磁界を印加さ
せない状態でこれら各素子を直列に結線した特許請求の
範囲第（１）項記載の周波数発電機。 （３）上記谷磁気抵抗素子を複数のグループに分割し、
これら各素子をそれぞれのグループ内で直列に結線する
とともにこれら各素子にバイアス磁界を印加するように
した特許請求の範囲第（１）項記載の周波数発電機。[Scope of Claims] (1) A frequency generator in which a plurality of magnetoresistive elements are arranged near a magnetized rotating body, and a frequency signal corresponding to the spacing between the capacitive elements is obtained. (2) The frequency generator according to claim (1), wherein each of the magnetoresistive elements is connected in series without applying a bias magnetic field to each of the magnetoresistive elements. divide into groups,
A frequency generator according to claim 1, wherein each of these elements is connected in series within each group and a bias magnetic field is applied to each of these elements.
JP18142082A 1982-10-18 1982-10-18 Frequency generator Pending JPS5972017A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18142082A JPS5972017A (en) 1982-10-18 1982-10-18 Frequency generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18142082A JPS5972017A (en) 1982-10-18 1982-10-18 Frequency generator

Publications (1)

Publication Number Publication Date
JPS5972017A true JPS5972017A (en) 1984-04-23

Family

ID=16100451

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18142082A Pending JPS5972017A (en) 1982-10-18 1982-10-18 Frequency generator

Country Status (1)

Country Link
JP (1) JPS5972017A (en)

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