JPS6035897Y2 - rotation detection device - Google Patents

Description

【考案の詳細な説明】 本考案は回転検出装置の改良に関するものである。[Detailed explanation of the idea] The present invention relates to an improvement of a rotation detection device.

従来の回転検出装置を第１図に基いて説明すると、磁性
体よりなる円板の周縁に凹凸を形成せしめてなる回転体
３とコイル２を巻回せしめているマグネット１とを組合
せ、マグネット１の先端と回転体３の凸部が接近した時
矢印Ａの磁路が形成される。A conventional rotation detection device will be explained based on FIG. 1. A rotating body 3 made of a disk made of a magnetic material with unevenness formed on the periphery and a magnet 1 around which a coil 2 is wound are combined. When the tip of the rotating body 3 approaches the convex portion of the rotating body 3, a magnetic path as indicated by the arrow A is formed.

ここで回転体３が凸部。数、。回転するとマグネット先
端と回転体の凸部が離れ、この磁束変化でコイル２に誘
導電流が発生し、この出力で回転数の検出ができるもの
である。Here, the rotating body 3 is a convex portion. number,. When the magnet rotates, the tip of the magnet separates from the convex portion of the rotating body, and this change in magnetic flux generates an induced current in the coil 2, and the number of rotations can be detected from this output.

ここで大きな出力を発生させたい場合には磁束の変化量
を大きくすることが考えられるが、このためにはマグネ
ット先端と回転体３とのギャップＤを極力小さくすると
共にケース５、ヨーク４を経てマグネット１の他極へ通
じているギャップＥも小さくする事が望ましい。If you want to generate a large output, it is possible to increase the amount of change in magnetic flux, but for this purpose, the gap D between the magnet tip and the rotating body 3 should be made as small as possible, and the It is also desirable to make the gap E leading to the other pole of the magnet 1 small.

しかしながら、上記従来構造においては、ギャップＤの
最小時にギヤツブＥ部でケース５が回転体３と接触する
事は許されないから、部品寸法公差上ケース５の部分は
ギャップＥが大きくなる方向で設定する必要があり、ギ
ャップＤとＥの両者が最良の位置となることは難かしい
。However, in the above conventional structure, the case 5 is not allowed to come into contact with the rotating body 3 at the gear E portion when the gap D is at its minimum, so the case 5 portion is set in the direction in which the gap E becomes larger due to component dimensional tolerances. It is difficult to find the best positions for both gaps D and E.

またこの形状でギャップＤとＥを個々に調整する事はで
きない。Also, with this shape, gaps D and E cannot be adjusted individually.

更に態形状の回転体３に使用しようとした場合にはその
度にケース外径、ケース長さ、機器の基本となるべき部
分を再設計しなければならず汎用性に著しく欠けるもの
である。Furthermore, if the device is to be used in a rotary body 3 having a circular shape, the outer diameter of the case, the length of the case, and the basic parts of the device must be redesigned each time, resulting in a significant lack of versatility.

その他従来ではマグネット１の外径とケース５の内径と
の間隔を十分に確保しないと矢印Ｂで示す磁気漏洩が起
り、極端な効率低下を生じる。In addition, in the conventional case, unless a sufficient distance is secured between the outer diameter of the magnet 1 and the inner diameter of the case 5, magnetic leakage as shown by arrow B occurs, resulting in an extreme drop in efficiency.

またマグネット１の磁力を効率良く得ようとすると、そ
の径も自ずと制約があるが、回転体３の凸部の形状が小
さい場合には第２図に示す如くマグネットの先端にポー
ルピース６を設けることも必要となるが、この場合ギャ
ップＤ、Ｅの他にエアギャップを生じる要素が多い。Furthermore, in order to obtain the magnetic force of the magnet 1 efficiently, there is a restriction on its diameter, but if the shape of the convex part of the rotating body 3 is small, a pole piece 6 is provided at the tip of the magnet as shown in FIG. However, in this case, in addition to the gaps D and E, there are many other elements that create an air gap.

更にマグネット１の径と回転体３の凸部形状の相性が良
ぐポールピース６を設ける必要がない場合にも第１図に
示す構造ではマグネットに他物がぶつかった場合、この
マグネットが破損する危険がある。Furthermore, even if the diameter of the magnet 1 and the shape of the convex part of the rotating body 3 are compatible and there is no need to provide the pole piece 6, the structure shown in FIG. 1 will cause damage to the magnet if another object hits it. There is a danger.

この対策として第３図に示す如くマグネット体にキャッ
プ７を被せることが考えられるが、この材質は磁性体を
使用することができないので、そのキャップの厚さ分が
ギャップの増大となり出力が低下する等の欠点が多々あ
った。As a countermeasure to this problem, it is possible to cover the magnet body with a cap 7 as shown in Fig. 3, but since this material cannot be made of magnetic material, the thickness of the cap increases the gap and reduces the output. There were many shortcomings such as.

本考案はかかることから鑑みてなされたもので、本考案
を第４図乃至第７図に示す実施例に基いて詳細に説明す
る。The present invention has been devised in view of the above, and will be described in detail based on the embodiments shown in FIGS. 4 to 7.

１１は外周に複数個の凸部１２を有する円板であって、
この円板１１の接線方向Ｈに着磁されたマグネット１３
のＮ極に接したヨーク１４ａはその下側部を直角に折り
曲げ、この折り曲げられた下側面１４′ａをねじ１５に
よってフレーム１６に固定する。11 is a disk having a plurality of convex portions 12 on its outer periphery,
A magnet 13 magnetized in the tangential direction H of this disk 11
The lower side of the yoke 14a that is in contact with the N pole is bent at a right angle, and the bent lower side 14'a is fixed to the frame 16 with screws 15.

この下側面１４′ａによりヨーク１４ａ先端と円板１１
の外周凸部１２との間のギャップを決める。This lower surface 14'a connects the tip of the yoke 14a to the disc 11.
The gap between the outer peripheral convex portion 12 and the outer peripheral convex portion 12 is determined.

尚このギャップはシムを用いて調整する事も可能であり
、またヨーク１４ａ先端と該ヨークに形成した下側面１
４′ａの間で所望の寸法出しをすることは一部品の加工
寸法であるから、比較的容易にできる。This gap can also be adjusted using shims, and it is also possible to adjust the gap between the tip of the yoke 14a and the lower surface 1 formed on the yoke.
It is relatively easy to obtain the desired dimensions between 4'a and 4'a because the dimensions are processed in one piece.

一方マグネット１３のＳ極に接したヨーク１４ｂは円板
１１の側面に対向しているが、このヨーク１４ｂにもそ
の一部を直角に折り曲げて折曲面１４′ｂを形成し、こ
の折曲面１４′ｂをフレーム１６の一部に当接させるこ
とでヨーク１４ｂと円板１１側面とのギャップを決め、
ねじ１５で締着される。On the other hand, the yoke 14b in contact with the S pole of the magnet 13 faces the side surface of the disk 11, and a part of this yoke 14b is also bent at right angles to form a bent surface 14'b. 'b is brought into contact with a part of the frame 16 to determine the gap between the yoke 14b and the side surface of the disc 11,
It is tightened with screws 15.

１７はケース、１８は前記円板１１が固定されている回
転軸、１９はその回転軸の変速機、２０及び２１はヨー
ク１４ａ、１４ｂをフレーム１６に貫通せしめるための
透孔、２２及び２３は前記のねじ１５を挿通するための
通孔であるが、この通孔２２，２３はヨーク１４ａ、１
４ｂの取付は位置を調整できるように孔径を大きく形成
しである。17 is a case, 18 is a rotating shaft to which the disc 11 is fixed, 19 is a transmission for the rotating shaft, 20 and 21 are through holes for passing the yokes 14a and 14b through the frame 16, and 22 and 23 are through holes. These through holes 22 and 23 are for inserting the screw 15, and these through holes 22 and 23
4b is installed by forming a hole with a large diameter so that the position can be adjusted.

上記２枚のヨーク４ａ及び４ｂは非磁性材料からなる円
筒状ケース１７の両端開口部に固着されている。The two yokes 4a and 4b are fixed to openings at both ends of a cylindrical case 17 made of a non-magnetic material.

マグネット１３の外周には検出コイル２４が巻かれ磁束
の変化により誘導電流を発生する。A detection coil 24 is wound around the outer periphery of the magnet 13 and generates an induced current due to changes in magnetic flux.

磁路はマグネット１３のＮ極→Ｎｉ側ヨーク１４ａ→円
板１１の凸部１２→円板１１の側面→Ｓ極側ヨーク１４
ｂ→マグネット１３のＳ極との順で形成され、円板１１
の外周凸部１２の有無でその磁束量が増減する。The magnetic path is N pole of magnet 13 → Ni side yoke 14a → convex part 12 of disk 11 → side surface of disk 11 → S pole side yoke 14
b→The S pole of the magnet 13 is formed in this order, and the disk 11
The amount of magnetic flux increases or decreases depending on the presence or absence of the outer peripheral convex portion 12.

尚上記実施例ではマグネット１３の両端にそれとは別体
のヨーク１４ａ、１４ｂを当接するように、ヨークをケ
ース１７に固定したものが示されているが、そのマグネ
ット１３とヨークを一体に形成したものであってもよい
。In the above embodiment, the yoke is fixed to the case 17 so that separate yokes 14a and 14b are in contact with both ends of the magnet 13, but the magnet 13 and the yoke may be formed integrally. It may be something.

また前記円板１１には凹凸が形成されているがその円板
１１の円周方向に透孔を穿設したものであってもよい。Furthermore, although the disc 11 has irregularities formed therein, a through hole may be formed in the circumferential direction of the disc 11.

更に第７図に示す如くマグネット１３を円板１１の側方
に配置したものであってもよい。Furthermore, as shown in FIG. 7, the magnet 13 may be placed on the side of the disk 11.

本実施例は以上の様に構成されているもので今、検出出
力を大ならしめるための双方ヨークと、円板１１とのギ
ャップ調整は次の如くして行なう。The present embodiment is constructed as described above, and the gap adjustment between the two yokes and the disk 11 in order to increase the detection output will now be performed as follows.

即ちＮ極側ヨーク１４ａと円板１１の凸部１２間のギャ
ップ調整は円板３の半径方向Ｆの動きで行ない、またＳ
極側ヨーク１４ｂと円板１１の側面間のギャップ調整は
円板３の回転軸方向の動きＧで行なうことができ、上記
双方の調整を互に独立して行なうことができ、ヨーク４
ａと円板１１との間及びヨーク４ｂと円板１１との間の
間隙を適切に設定することができる。That is, the gap between the N-pole side yoke 14a and the convex portion 12 of the disk 11 is adjusted by moving the disk 3 in the radial direction F, and the S
The gap between the pole side yoke 14b and the side surface of the disk 11 can be adjusted by the movement G of the disk 3 in the direction of the rotation axis, and both of the above adjustments can be made independently of each other.
The gaps between a and the disk 11 and between the yoke 4b and the disk 11 can be appropriately set.

以上のように本考案は、回転が計測される回転′体と連
結し、その回転によって回転し、かつ周端縁部に段部１
２が設けられた磁性材料からなる円板１１をフレーム１
６に枢支するとともに、外周にコイル２４が巻回され、
かつ一端に前記円板１１の周端縁と対向する一方の磁極
部１４ａを、他端に前記円板１１の側面と対向する他方
の磁極部１４ｂをそれぞれ固定した永久磁石１３を、前
記他方の磁極部１４ｂが前記円板１１の軸線方向に、ま
た前記一方の磁極部１４ａが前記円板１１の半径方向に
移動可能に取付けてなる回転検出装置であるから、本考
案によれば次の如き効果がある。As described above, the present invention is connected to a rotating body whose rotation is measured, rotates by the rotation, and has a stepped portion on the peripheral edge.
A frame 1 includes a disk 11 made of a magnetic material provided with
6, and a coil 24 is wound around the outer periphery.
A permanent magnet 13 having one magnetic pole part 14a facing the circumferential edge of the disc 11 fixed at one end, and the other magnetic pole part 14b facing the side surface of the disc 11 fixed at the other end, is fixed to the other end. Since this is a rotation detection device in which the magnetic pole part 14b is movably mounted in the axial direction of the disc 11 and the one magnetic pole part 14a is movable in the radial direction of the disc 11, the present invention has the following features. effective.

ａ マグネット１３の両極もしくはそのヨーク１４ａ、
１４ｂと被検出体とのギャップを各各独立して調整でき
るので有効な閉磁路を形成できる。a Both poles of the magnet 13 or its yoke 14a,
Since the gap between 14b and the object to be detected can be adjusted independently, an effective closed magnetic path can be formed.

ｂ 各々のヨーク１４ａ、１４ｂのプレス形状、寸法出
しで被検出体とのギャップを決める事も可能である。b It is also possible to determine the gap between the yokes 14a and 14b by determining the pressed shape and dimensions of the yokes 14a and 14b.

Ｃマグネット１３、コイル２４の形状、寸法の自由度が
大きいので所要の出力を出す事が容易になる。Since there is a large degree of freedom in the shape and dimensions of the C magnet 13 and the coil 24, it becomes easy to produce the required output.

ｄ ケース１７の両側板部をヨーク１４ａ、１４ｂで形
成しているので部品点数が少ない。d Since both side plate portions of the case 17 are formed by the yokes 14a and 14b, the number of parts is small.

ｅ 円板の側面用ヨーク１４ｂはその対向面積を自由に
設定できる。e The opposing area of the circular plate side yoke 14b can be freely set.

（円周凸部の様な場合は凸部の面積がその最大である。(In the case of a circumferential convex part, the area of the convex part is the maximum.

なおズレを考慮しヨークはそれより大きくする事が有効
ではある。In addition, it is effective to make the yoke larger than this in consideration of misalignment.

）対向面積の大きい分だけギャップを大きく（ラフに）
設定する事も可能である。) Increase the gap (roughly) by the larger opposing area
It is also possible to set.

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

第１図、第２図、第３図は従来の回転検出装置の概略を
示した断面図、第４図は本考案よりなる回転検出装置の
実施例を示した一部切欠側面図、第５図は第４図におけ
る■−Ｖ線断面図、第６図は第５図におけるＶｌ−ＶＩ
線断面図、第７図は他の実施例を示した略図である。 １１・・・・・・円板、１２・・・・・・凸部、１３・
・・・・・マグネット、１４ａｔ１４ｂ・・・・・・ヨ
ーク、１４′ａ・・・・・・下側面、１４′ｂ・・・・
・・折曲面、１５・・・・・・ねじ、１６・・・・・・
フレーム、１７・・・・・・ケース、１８・・・・・・
回転軸、１９・・・・・・変速機、２０，２１・・・・
・・透孔、２２．２３・・・・・・通孔、２４・・・・
・・コイル。1, 2, and 3 are cross-sectional views showing the outline of a conventional rotation detection device, FIG. 4 is a partially cutaway side view showing an embodiment of the rotation detection device according to the present invention, and FIG. The figure is a cross-sectional view taken along the ■-V line in Figure 4, and Figure 6 is the Vl-VI line in Figure 5.
The line sectional view, FIG. 7, is a schematic diagram showing another embodiment. 11...disk, 12...convex portion, 13.
...Magnet, 14at14b...Yoke, 14'a...Bottom side, 14'b...
...Bending surface, 15...Screw, 16...
Frame, 17... Case, 18...
Rotating shaft, 19...Transmission, 20, 21...
...Through hole, 22.23...Through hole, 24...
··coil.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 回転が計測される回転体と連結し、その回転によって回
転し、かつ周端縁部に段部１２が設けられた磁性材料か
らなる円板１１をフレーム１６に枢支するとともに、外
周にコイル２４が巻回され、かつ一端に前記円板１１の
周端縁と対向する一方の磁極部１４ａを、他端に前記円
板１１の側面と対向する他方の磁極部１４ｂをそれぞれ
固定した永久磁石１３を、前記他方の磁極部１４ｂが前
記円板１１の軸線方向に、また前記一方の磁極部１４ａ
が前記円板１１の半径方向に移動可能に取付けてなる回
転検出装置。A disk 11 made of a magnetic material that is connected to a rotating body whose rotation is to be measured, rotates with the rotation thereof, and has a stepped portion 12 on its peripheral edge is pivotally supported on a frame 16, and a coil 24 is attached to the outer periphery. A permanent magnet 13 is wound around the permanent magnet 13, and has one magnetic pole portion 14a facing the circumferential edge of the disk 11 fixed to one end, and the other magnetic pole portion 14b facing the side surface of the disk 11 fixed to the other end. , the other magnetic pole portion 14b extends in the axial direction of the disk 11, and the one magnetic pole portion 14a
is attached movably in the radial direction of the disk 11.