JPS63277902A - Position detector for rotary body - Google Patents

Position detector for rotary body

Info

Publication number
JPS63277902A
JPS63277902A JP11334387A JP11334387A JPS63277902A JP S63277902 A JPS63277902 A JP S63277902A JP 11334387 A JP11334387 A JP 11334387A JP 11334387 A JP11334387 A JP 11334387A JP S63277902 A JPS63277902 A JP S63277902A
Authority
JP
Japan
Prior art keywords
pole
coil
rotating body
position detector
main pole
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.)
Granted
Application number
JP11334387A
Other languages
Japanese (ja)
Other versions
JPH0739930B2 (en
Inventor
Shunsuke Nakaura
俊介 中浦
Manabu Taniguchi
学 谷口
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.)
Koyo Seiko Co Ltd
Original Assignee
Koyo Seiko Co Ltd
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 Koyo Seiko Co Ltd filed Critical Koyo Seiko Co Ltd
Priority to JP62113343A priority Critical patent/JPH0739930B2/en
Publication of JPS63277902A publication Critical patent/JPS63277902A/en
Publication of JPH0739930B2 publication Critical patent/JPH0739930B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

PURPOSE:To reduce magnetic resistance by putting the part of a subordinate pole on a main pole side close to a coil and shortening a magnetic path. CONSTITUTION:The subordinate pole 14 increases in width toward a pole coupling member 12 so that the surface 14a of the subordinate pole 14 on the side of the coil 5 is parallel to the external surface of the coil 5 and approaches the coil 15. Consequently, the magnetic path A is formed extending through nearby the surface 14a of the subordinate pole 14 on the side of the coil 15. Then this surface 14a is parallel to the coil 15 and close to the coil 15, so the magnetic path A is shorter than usual and the magnetic resistance decreases correspondingly. The sensitivity of a position detector 11, therefore, increases and the temperature characteristics are improved.

Description

【発明の詳細な説明】 産業上の利用分野 この発明は、回転体の位置検出器、さらに詳しくは、た
とえば磁気軸受装置のロータなどの半径方向の変位を検
出するインダクタンス検知式非接触位置検出器に関する
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a position detector for a rotating body, more specifically, an inductance-sensing non-contact position detector for detecting radial displacement of a rotor of a magnetic bearing device, etc. Regarding.

従来の技術とその問題点 この種の位置検出器として、第2図に示すようなものが
知られている。
BACKGROUND ART AND PROBLEMS There is a known position detector of this type as shown in FIG.

第2図は、回転体(lO)と、その周囲に等間隔をおい
て配置された4個の位置検出器(11)とを示し、各位
置検出器(11)は次のように構成されている。すなわ
ち、回転体(lO)の周囲に円環状のポール連結部材(
12)が同心状に配置されており、ポール連結部材(1
2)の内面を円周方向に4等分する位置に回転体(10
)側に突出したメインポール(13)が一体に形成され
るとともに、各メインポール(13)の両側のポール連
結部材(12)の内面に回転体(lO)側に突出したサ
ブポール(14)が一体に形成されている。メインポー
ル(13)にはコイル(15)が巻かれており、同図に
破線で示すように、メインポール(13)から回転体(
10)、両側のサブポール(14)およびポール連結部
材(12)を通ってメインポール(13)に戻る環状磁
路(A)が形成される。これにより1個の位置検出器(
11)が構成され、各検出器(11)において、メイン
ポール(13)と回転体(10)の距離が変化したとき
のインダクタンスの変化を電気量として取出し、これに
よりメインポール(13)に対する回転体(lO)の半
径方向の変位を検出する。そして、4個の検出器(11
)の出力信号を公知の適宜な方法で処理することにより
、回転体(lO)の互いに直交する2つの半径方向の位
置が検出される。
Figure 2 shows a rotating body (IO) and four position detectors (11) arranged around it at equal intervals, and each position detector (11) is constructed as follows. ing. That is, an annular pole connecting member (
12) are arranged concentrically, and the pole connecting members (1
A rotating body (10
A main pole (13) protruding toward ) side is integrally formed, and sub-poles (14) protruding toward the rotating body (lO) are formed on the inner surface of the pole connecting member (12) on both sides of each main pole (13). It is formed in one piece. A coil (15) is wound around the main pole (13), and as shown by the broken line in the same figure, the rotating body (
10) A circular magnetic path (A) is formed that returns to the main pole (13) through the sub-poles (14) and the pole connecting member (12) on both sides. This allows one position detector (
11) is configured, and in each detector (11), the change in inductance when the distance between the main pole (13) and the rotating body (10) changes is extracted as an electric quantity, and the rotation with respect to the main pole (13) is detected. The radial displacement of the body (lO) is detected. Then, four detectors (11
By processing the output signals of ) in a known suitable manner, two mutually orthogonal radial positions of the rotating body (lO) are detected.

ところで、上記のような従来の位置検出器(ll)では
、メインポール(13)はポール連結部材(12)の内
面から直角仲突出し、かつその幅は各部分において一定
である。また、コイル(15)はメインポール(13)
に一様に巻かれており、その幅も各部分において一定で
ある。さらに、サブポール(14)もポール連結部材(
12)の内面から直角に突出し、その幅は各°部分にお
いて一定である。
By the way, in the conventional position detector (ll) as described above, the main pole (13) projects from the inner surface of the pole connecting member (12) at a right angle, and its width is constant in each part. Also, the coil (15) is connected to the main pole (13)
It is wound uniformly, and its width is constant in each part. Furthermore, the sub-pole (14) also has a pole connecting member (
12) protrudes from the inner surface at a right angle, and its width is constant in each degree section.

ところが、コイル(15)の幅およびサブポール(14
)の幅がそれぞれ一定であるから、サブポール(14)
は回転体(lO)側ではコイル(15)に接近している
が、ポール連結部材(12)側ではコイル(15)から
離れている。このため、磁路(A)が遠回りして長くな
り、磁気抵抗が大きくなる。そして、磁気抵抗が大きく
なることにより、感度が低下し、温度特性が悪くなるな
どの問題が生じる。
However, the width of the coil (15) and the sub-pole (14)
) are constant, so the subpole (14)
is close to the coil (15) on the rotating body (lO) side, but is away from the coil (15) on the pole connecting member (12) side. Therefore, the magnetic path (A) takes a detour and becomes longer, increasing magnetic resistance. Then, as the magnetic resistance increases, problems such as decreased sensitivity and poor temperature characteristics occur.

この発明の目的は、上記の問題を解決し、磁気抵抗をで
きるだけ小さくできる回転体の位置検出器を提供するこ
とにある。
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a position detector for a rotating body that can reduce magnetic resistance as much as possible.

問題点を解決するための手段 この発明による回転体の位置検出器は、回転体の周囲に
配置されたポール連結部材に回転体側に突出したメイン
ポールとメインポールの両側から回転体側に突出したサ
ブポールが設けられ、メインポールにコイルが巻かれて
、メインポールから回転体、サブポールおよびポール連
結部材を通ってメインポールに戻る磁路が形成されるよ
うになされた回転体の位置検出器において、 サブポールのメインポール側の部分がコイルに接近して
、磁路が短くなりていることを特徴とするものである。
Means for Solving the Problems A position detector for a rotating body according to the present invention includes a main pole protruding toward the rotating body and sub poles protruding from both sides of the main pole toward the rotating body on a pole connecting member arranged around the rotating body. A position detector for a rotating body in which a coil is wound around the main pole to form a magnetic path from the main pole to the main pole through the rotating body, the sub pole and the pole connecting member. The main pole side of the coil is closer to the coil, making the magnetic path shorter.

作     用 サブポールのメインポール側の部分がコイルに接近して
、磁路が短くなっているので、磁気抵抗も小さくなる。
Since the main pole side part of the working sub-pole is closer to the coil, the magnetic path is shorter, so the magnetic resistance is also smaller.

実  施  例 第1図はこの発明の実施例を示し、従来例と同じ部分に
は同一の符号を付している。
Embodiment FIG. 1 shows an embodiment of the present invention, in which the same parts as in the conventional example are given the same reference numerals.

サブポール(14)のコイル(15)側の面(14a)
がコイル(15)の外面と平行になり、かつコイル(1
5)に接近するように、サブポール(14)の幅はポー
ル連結部材(12)側にいくにつれて徐々に大きくなっ
ている。他は従来例の場合と同様である。lこの実施例
の位置検出器(11)では、磁路(A)はサブポール(
14)のコイル(15)側の面(14a)に近い部分を
通って形成される。そして、この面(14a)がコイル
(15)と平行でかつコイル(15)に接近しているの
で、従来のものに比べ1て磁路(A)が短くなり、その
分だけ磁気抵抗が小さくなる。このため、位置検出器(
11)の感度が大きくなり、これにより温度特性が向上
する。
Coil (15) side surface (14a) of sub pole (14)
is parallel to the outer surface of the coil (15), and
5), the width of the sub-pole (14) gradually increases toward the pole connecting member (12). The rest is the same as in the conventional example. l In the position detector (11) of this embodiment, the magnetic path (A) has a sub-pole (
14) near the surface (14a) on the coil (15) side. Since this surface (14a) is parallel to and close to the coil (15), the magnetic path (A) is shorter than the conventional one, and the magnetic resistance is reduced accordingly. Become. For this reason, the position detector (
11) The sensitivity is increased, which improves the temperature characteristics.

上記実施例では、4個の位置検出器(11)のポール連
結部材(12)が一体内環状をなしているが、ポール連
結部材(12)は位置検出器(11)ごとに分割されて
いてもよい。
In the above embodiment, the pole connecting members (12) of the four position detectors (11) form an inner ring, but the pole connecting members (12) are divided for each position detector (11). Good too.

発明の効果 この発明の回転体の位置検出器によれば、サブポールの
メインポール側の部分がコイルに接近して、磁路が短く
なっているので、磁気抵抗も小さくなる。このため、感
度が大きくなり、。
Effects of the Invention According to the position detector for a rotating body of the present invention, the portion of the sub-pole on the main pole side approaches the coil and the magnetic path is shortened, so that the magnetic resistance is also reduced. Because of this, the sensitivity increases.

これにより温度特性が向上するなどの利点がある。This has advantages such as improved temperature characteristics.

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

第1図はこの発明の実施例を示す回転体とその位置検出
器の横断面図、第2図は従来例を示す第1図相当の図面
である。 (lO)・・・回転体、(11)・・・位置検出器、(
12)・・・ポール連結部材、(13)・・・メインポ
ール、(14)・・・サブポール、(15)・・・コイ
ル、(A)・・・磁路。
FIG. 1 is a cross-sectional view of a rotating body and its position detector showing an embodiment of the present invention, and FIG. 2 is a drawing corresponding to FIG. 1 showing a conventional example. (lO)...Rotating body, (11)...Position detector, (
12) Pole connecting member, (13) Main pole, (14) Sub pole, (15) Coil, (A) Magnetic path.

Claims (1)

【特許請求の範囲】  回転体の周囲に配置されたポール連結部材に回転体側
に突出したメインポールとメインポールの両側から回転
体側に突出したサブポールが設けられ、メインポールに
コイルが巻かれて、メインポールから回転体、サブポー
ルおよびポール連結部材を通ってメインポールに戻る磁
路が形成されるようになされた回転体の位置検出器にお
いて、 サブポールのメインポール側の部分がコイルに接近して
、磁路が短くなっていることを特徴とする回転体の位置
検出器。
[Claims] A main pole protruding toward the rotating body and sub poles protruding toward the rotating body from both sides of the main pole are provided on a pole connecting member disposed around the rotating body, and a coil is wound around the main pole, In a position detector for a rotating body that is configured to form a magnetic path from the main pole to the main pole through the rotating body, the sub-pole, and the pole connecting member, when the main pole side portion of the sub-pole approaches the coil, A position detector for a rotating body characterized by a short magnetic path.
JP62113343A 1987-05-08 1987-05-08 Rotor position detector Expired - Fee Related JPH0739930B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62113343A JPH0739930B2 (en) 1987-05-08 1987-05-08 Rotor position detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62113343A JPH0739930B2 (en) 1987-05-08 1987-05-08 Rotor position detector

Publications (2)

Publication Number Publication Date
JPS63277902A true JPS63277902A (en) 1988-11-15
JPH0739930B2 JPH0739930B2 (en) 1995-05-01

Family

ID=14609840

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62113343A Expired - Fee Related JPH0739930B2 (en) 1987-05-08 1987-05-08 Rotor position detector

Country Status (1)

Country Link
JP (1) JPH0739930B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5194805A (en) * 1989-12-29 1993-03-16 National Aerospace Laboratory, Ebara Research Co., Ltd. Inductance-type displacement sensor for eliminating inaccuracies due to external magnetic fields
JP2006177834A (en) * 2004-12-24 2006-07-06 Jtekt Corp Rolling bearing unit with sensor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5967404A (en) * 1982-09-24 1984-04-17 Seiko Instr & Electronics Ltd Detector of radial displacement of rotary body

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5967404A (en) * 1982-09-24 1984-04-17 Seiko Instr & Electronics Ltd Detector of radial displacement of rotary body

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5194805A (en) * 1989-12-29 1993-03-16 National Aerospace Laboratory, Ebara Research Co., Ltd. Inductance-type displacement sensor for eliminating inaccuracies due to external magnetic fields
JP2006177834A (en) * 2004-12-24 2006-07-06 Jtekt Corp Rolling bearing unit with sensor

Also Published As

Publication number Publication date
JPH0739930B2 (en) 1995-05-01

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