JP2019146346A - Rotation preventing structure of encoder - Google Patents

Rotation preventing structure of encoder Download PDF

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JP2019146346A
JP2019146346A JP2018027815A JP2018027815A JP2019146346A JP 2019146346 A JP2019146346 A JP 2019146346A JP 2018027815 A JP2018027815 A JP 2018027815A JP 2018027815 A JP2018027815 A JP 2018027815A JP 2019146346 A JP2019146346 A JP 2019146346A
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encoder
attached
rotation
electrical machine
rotating electrical
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JP7132722B2 (en
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慶春 沈
Qing Chun Shen
慶春 沈
敏正 西野
Toshimasa Nishino
敏正 西野
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Toshiba Industrial Products and Systems Corp
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Abstract

To provide a rotation preventing structure of an encoder that makes it difficult to transmit external vibration to the encoder.SOLUTION: A rotation preventing structure of an encoder is a structure for preventing rotation of a fixed section attached to a rotating shaft of a rotating electric machine, and comprises a projection member that is mounted on either the rotating electric machine side or the fixed section of the encoder and a locking member that is attached to the other and has a shape such that at least two sides in a circumferential direction are sandwiched in a longitudinal direction of the projection member. A circumferential width of the locking member is longer than that of the projection member, and the fixed section is prevented from being rotated by locking the projection member on the locking member.SELECTED DRAWING: Figure 1

Description

本発明の実施形態は、回転電機に取り付けられるエンコーダを回り止めするための構造に関する。   Embodiments described herein relate generally to a structure for preventing rotation of an encoder attached to a rotating electrical machine.

エンコーダは、回転電機の回転数を検出するため回転軸の軸端に取り付けられる。その際に、エンコーダの固定側が回転しないように回り止めする必要がある。エンコーダを例えば回転電機のファンカバーに取り付けるとすると、従来は、例えば図９に示すように、エンコーダの固定側にある金具を、ファンカバーにねじ止めする等して固定している。   The encoder is attached to the shaft end of the rotating shaft in order to detect the rotational speed of the rotating electrical machine. At that time, it is necessary to prevent the rotation of the fixed side of the encoder so as not to rotate. If the encoder is attached to a fan cover of a rotating electric machine, for example, as shown in FIG. 9, for example, a metal fitting on the fixed side of the encoder is fixed to the fan cover by screwing or the like.

特開平４−８７５４１号公報JP-A-4-87541

しかしながら、このような従来の構造では、ファンカバーからの振動や回転軸のエンドプレーによる動きが、そのまま直接エンコーダに伝達される。そのため、エンコーダの寿命に影響を及ぼすおそれがあった。
そこで、外部からの振動等をエンコーダに伝達し難くするエンコーダの回り止め構造を提供する。 However, in such a conventional structure, the vibration from the fan cover and the movement of the rotating shaft due to the end play are directly transmitted to the encoder as they are. As a result, the life of the encoder may be affected.
Therefore, an encoder rotation prevention structure that makes it difficult to transmit external vibration or the like to the encoder is provided.

本実施形態のエンコーダの回り止め構造は、回転電機の回転軸に取り付けられる固定部を、回り止めするための構造であって、
前記回転電機側とエンコーダの前記固定部との一方に取り付けられる突起部材と、他方に取り付けられ、前記突起部材の長手方向において少なくとも周方向の二方を挟む形状を成す係止部材とからなり、
前記係止部材の周方向幅寸法は、前記突起部材の周方向幅寸法よりも長く、
前記係止部材に前記突起部材を係止させることで、前記固定部を回り止めする。 The anti-rotation structure of the encoder of the present embodiment is a structure for preventing the rotation of the fixed portion attached to the rotating shaft of the rotating electrical machine,
A protrusion member attached to one of the rotating electrical machine side and the fixed portion of the encoder, and a locking member attached to the other and having a shape sandwiching at least two sides in the circumferential direction in the longitudinal direction of the protrusion member,
The circumferential width dimension of the locking member is longer than the circumferential width dimension of the protruding member,
By locking the protruding member with the locking member, the fixing portion is prevented from rotating.

第１実施形態であり、ファンカバーに取り付けられたエンコーダを示す斜視図The perspective view which is 1st Embodiment and shows the encoder attached to the fan cover ファンカバーに取り付けられたエンコーダを示す正面図Front view showing the encoder attached to the fan cover ファンカバーに取り付けられたエンコーダを、一部を透過して示す側面図Side view showing part of the encoder attached to the fan cover. 回り止め金具の平面図Top view of rotation stopper 回り止め金具の左側面図Left side view of rotation stopper 回転電機の全体構成を、一部を破断させた状態で示す図The figure which shows the whole structure of a rotary electric machine in the state which fractured | ruptured a part 第２実施形態であり、回り止め金具のファンカバーに取り付けられたエンコーダを示す正面図The front view which is 2nd Embodiment and shows the encoder attached to the fan cover of the rotation stopper metal fitting 回り止め金具の左側面図Left side view of rotation stopper 従来例であり、ファンカバーに取り付けられたエンコーダを示す斜視図The perspective view which is the prior art example and shows the encoder attached to the fan cover

（第１実施形態）
以下、第１実施形態について図１から図６を参照して説明する。図６は回転電機の全体構成を、一部を破断させた状態で示している。フレーム１の内周部には、固定子２が設けられている。固定子２は、固定子鉄心２ａと、該鉄心２ａに装設した固定子巻線２ｂとを備えている。固定子２の内部には回転子３を配設しており、この回転子３は、回転子鉄心３ａと、該鉄心３ａに巻装かご形の回転子巻線３ｂとを備えている。回転子３の中心部には、回転軸４が軸方向，図中では、上下方向に挿通されている。 (First embodiment)
Hereinafter, the first embodiment will be described with reference to FIGS. 1 to 6. FIG. 6 shows the overall configuration of the rotating electrical machine in a state where a part thereof is broken. A stator 2 is provided on the inner periphery of the frame 1. The stator 2 includes a stator iron core 2a and a stator winding 2b installed on the iron core 2a. A rotor 3 is disposed inside the stator 2, and the rotor 3 includes a rotor iron core 3a and a squirrel-cage-shaped rotor winding 3b around the iron core 3a. A rotation shaft 4 is inserted in the central portion of the rotor 3 in the axial direction, in the vertical direction in the drawing.

フレーム１の軸方向両端部において、それぞれブラケット５，６が複数本のボルト７，８及びナット９，１０により結合されている。これらのブラケット５，６に、回転軸４の両端部４ａ，４ｂがそれぞれ軸受１１，１２を介して支承されている。両ブラケット５，６は、フレーム１とで固定子２及び回転子３を内包する筐体１３を構成している。回転軸４の両端部４ａ，４ｂは、両ブラケット５，６から外方に突出している。一端部４ａは出力軸であり、図示しない回転負荷が連結される。他端部４ｂには、ファン１４が取付けられている。すなわち、この回転電機は全閉外扇形である。   At both ends in the axial direction of the frame 1, brackets 5 and 6 are coupled by a plurality of bolts 7 and 8 and nuts 9 and 10, respectively. Both ends 4a and 4b of the rotating shaft 4 are supported by these brackets 5 and 6 via bearings 11 and 12, respectively. Both the brackets 5 and 6 constitute a housing 13 that encloses the stator 2 and the rotor 3 together with the frame 1. Both end portions 4 a and 4 b of the rotating shaft 4 protrude outward from the brackets 5 and 6. The one end 4a is an output shaft and is connected to a rotational load (not shown). A fan 14 is attached to the other end 4b. That is, this rotating electrical machine has a fully enclosed outer fan shape.

ファン１４は、中央部に取付部１４ａを有し、この取付部１４ａを上記回転軸４の他端部４ｂに嵌合させている。そして取付部１４ａを径方向，図中の左右方向よりねじ１５を液状のシール剤を介し螺挿して回転軸４に係合させることで、他端部４ｂにファン１４が取付けられている。取付部１４ａから径方向の外方には、傘形円形の基盤部１４ｂが存しており、該基盤部１４ｂの外面側に複数の翼部１４ｃが突設されている。   The fan 14 has a mounting portion 14 a at the center, and the mounting portion 14 a is fitted to the other end portion 4 b of the rotating shaft 4. Then, the fan 14 is attached to the other end 4b by screwing the screw 15 through the liquid sealant and engaging the rotary shaft 4 from the radial direction in the radial direction and the horizontal direction in the figure. An umbrella-shaped circular base part 14b exists radially outward from the mounting part 14a, and a plurality of wing parts 14c project from the outer surface side of the base part 14b.

加えて、フレーム１には、ファン１４側の端部に、ファン１４の全部を覆うファンカバー１６が結合されている。ファンカバー１６は、図１に示すように、ファン１４に軸方向で面する部位に、例えば正方形状で多数の通気孔１７を有している。更に、フレーム１は、フィン１ａを放熱用に多数有しており、このフィン１ａはいずれもフレーム１の径方向に突出して軸方向に延びている。   In addition, a fan cover 16 that covers the entire fan 14 is coupled to the frame 1 at the end on the fan 14 side. As shown in FIG. 1, the fan cover 16 has, for example, a square shape and a large number of air holes 17 in a portion facing the fan 14 in the axial direction. Further, the frame 1 has a large number of fins 1a for heat dissipation, and all the fins 1a protrude in the radial direction of the frame 1 and extend in the axial direction.

図３に示すように、回転軸４の端部４ｂは、ファンカバー１６の中心に設けられた挿通孔２１を介して外部に突出しており、ファンカバー１６の外部にてエンコーダ２２が取り付けられている。ファンカバー１６には、回り止め金具２３が例えば溶接により固定されている。回り止め金具２３は、背面部２３Ｂ，右側壁部２３Ｒ及び左側壁部２３Ｌを有しており、図１の上方から見た形状，つまり図４に示す平面図における形状が略Ｕ字状である。また、図５に示す側壁部２４Ｌ及びこれに重なる側壁部２３Ｒは、矩形の右上角部分を斜めに切除した形状である。回り止め金具２３は、係止部材に相当する。   As shown in FIG. 3, the end 4 b of the rotating shaft 4 protrudes outside through an insertion hole 21 provided in the center of the fan cover 16, and an encoder 22 is attached outside the fan cover 16. Yes. A rotation stopper 23 is fixed to the fan cover 16 by welding, for example. The rotation stopper 23 has a back surface portion 23B, a right side wall portion 23R, and a left side wall portion 23L, and the shape seen from above in FIG. 1, that is, the shape in the plan view shown in FIG. 4, is substantially U-shaped. . Further, the side wall portion 24L and the side wall portion 23R overlapping with the side wall portion 24L shown in FIG. 5 have a shape obtained by obliquely cutting out the upper right corner portion of the rectangle. The rotation stopper 23 corresponds to a locking member.

一方、エンコーダ２２は、円筒形のトップカバー２５を有しており、トップカバー２５がファンカバー１６に対向する面側には、ドーナツ盤状のボトムカバー２６が配置されている。そして、ボトムカバー２６の一部を成すように回り止め用突起２７が設けられている。回り止め用突起２７は、若干伸ばされた半円状をしている。カバー２５及び２６は固定部に相当する。回り止め用突起２７は、突起部材に相当する。   On the other hand, the encoder 22 has a cylindrical top cover 25, and a donut-shaped bottom cover 26 is disposed on the surface side of the top cover 25 facing the fan cover 16. And the rotation prevention protrusion 27 is provided so that a part of bottom cover 26 may be comprised. The rotation-preventing protrusion 27 has a semicircular shape slightly extended. The covers 25 and 26 correspond to fixed portions. The rotation prevention protrusion 27 corresponds to a protrusion member.

次に、本実施形態の作用について説明する。エンコーダ２２をファンカバー１６の外部に取り付ける際には、ファンカバー１６に固定された回り止め金具２３の両側壁部２３Ｌ，２３Ｒの間に、回り止め用突起２７が位置するように配置する。つまり、回り止め用突起２７の正面を除く３方を、回り止め金具２３で囲むようにする。   Next, the operation of this embodiment will be described. When the encoder 22 is attached to the outside of the fan cover 16, the rotation prevention protrusion 27 is disposed between the side wall portions 23 </ b> L and 23 </ b> R of the rotation stopper 23 fixed to the fan cover 16. In other words, the anti-rotation projection 27 is surrounded by the anti-rotation bracket 23 in three directions except for the front.

この際に、図２に示す寸法例のように、例えば、回り止め金具２３の両側壁部２３Ｌ，２３Ｒの間隔を１５．５ｍｍとすると、回り止め用突起２７の周方向幅寸法を１５ｍｍとする。これにより、左右方向の隙間を均等に取れば、両者間には０．２５ｍｍずつの余裕，遊びがある。また、回り止め用突起２７は固定されていないので、図３に示すように、回転軸４の軸方向，図中左右方向についても余裕，遊びがある。つまり、回り止め用突起２７は、回り止め金具２３により固定されず、寸法的に余裕を持った状態で係止されているだけである。   At this time, as in the dimension example shown in FIG. 2, for example, if the interval between the side wall portions 23L and 23R of the rotation stopper 23 is 15.5 mm, the circumferential width dimension of the rotation stopper projection 27 is 15 mm. . Thus, if the left and right gaps are evenly spaced, there is a margin of 0.25 mm between them. Further, since the rotation-preventing protrusion 27 is not fixed, there is a margin and play in the axial direction of the rotating shaft 4 and in the left-right direction in the figure as shown in FIG. That is, the anti-rotation protrusion 27 is not fixed by the anti-rotation metal fitting 23, and is merely locked with a dimensional allowance.

以上のように本実施形態によれば、回転電機の回転軸４に取り付けられるエンコーダ２２の固定部を回り止めするため、回り止め金具２３の周方向幅寸法を、回り止め用突起２７の周方向幅寸法よりも長くし、ファンカバー１６に回り止め金具２３を固定し、エンコーダ２２側の回り止め用突起２７の３方を回り止め金具２３で囲むようにして係止させるようにした。これにより、回転電機が駆動されて回転軸４やフレーム１が振動しても、その振動がエンコーダ２２に直接伝達されることを防止できる。したがって、エンコーダ２２の寿命がより長くなる。   As described above, according to the present embodiment, in order to prevent the fixed portion of the encoder 22 attached to the rotating shaft 4 of the rotating electrical machine from rotating, the circumferential width dimension of the rotation stopper 23 is set to the circumferential direction of the rotation preventing projection 27. The anti-rotation bracket 23 is fixed to the fan cover 16 so as to be longer than the width dimension, and the anti-rotation projection 27 on the encoder 22 side is surrounded by the anti-rotation bracket 23 and locked. Thereby, even if the rotating electrical machine is driven and the rotating shaft 4 and the frame 1 vibrate, the vibration can be prevented from being directly transmitted to the encoder 22. Accordingly, the life of the encoder 22 is further prolonged.

特に、回転電機がファン１４を備えている際には、ファン１４により行われる送風が通気孔１７を介してフレーム１の外部に抜けるので、エンコーダ２２にはその送風による振動も加えられる。したがって、エンコーダ２２をファンカバー１６に配置する構成に対して好適である。   In particular, when the rotating electrical machine includes the fan 14, the air blown by the fan 14 is discharged to the outside of the frame 1 through the vent hole 17, so that vibration due to the air blow is also applied to the encoder 22. Therefore, it is suitable for the configuration in which the encoder 22 is disposed on the fan cover 16.

（第２実施形態）
以下、第１実施形態と同一部分には同一符号を付して説明を省略し、異なる部分について説明する。第２実施形態は、回り止め金具の別の形状を示す。図７及び図８に示すように、第２実施形態の回り止め金具３１は、回り止め金具２３の背面部２３Ｂに相当する部分の下半分を削除した形状の背面部３１Ｂを備えている。尚、図７では、背面部３１Ｂにハッチングを付して示している。このような形状の回り止め金具３１を用いた場合も、回り止め金具２３の周方向の２方を、第１実施形態と同様に両側壁部２３Ｌ，２３Ｒにより挟むことができるので、同様の効果が得られる。 (Second Embodiment)
Hereinafter, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted, and different parts will be described. 2nd Embodiment shows another shape of a rotation stopper metal fitting. As shown in FIGS. 7 and 8, the detent metal fitting 31 of the second embodiment includes a back surface portion 31 </ b> B in which the lower half of the portion corresponding to the back surface portion 23 </ b> B of the detent metal fitting 23 is deleted. In FIG. 7, the back surface portion 31B is hatched. Even when the anti-rotation metal fitting 31 having such a shape is used, the two effects in the circumferential direction of the anti-rotation metal fitting 23 can be sandwiched between the side wall portions 23L and 23R in the same manner as in the first embodiment. Is obtained.

（その他の実施形態）
ファン及びファンカバーが無い回転電機に適用しても良い。
エンコーダの固定部に係止部材を配置し、回転電機側に突起部材を配置しても良い。
各部材の形状や寸法は、要旨を逸脱しない範囲で適宜変更して良い。例えば、側壁部２３Ｌ，２３Ｒの形状は矩形でも良い。 (Other embodiments)
You may apply to the rotary electric machine without a fan and a fan cover.
A locking member may be disposed on the fixed portion of the encoder, and a protruding member may be disposed on the rotating electrical machine side.
The shape and dimensions of each member may be changed as appropriate without departing from the scope of the invention. For example, the side walls 23L and 23R may be rectangular.

本発明のいくつかの実施形態を説明したが、これらの実施形態は例として提示したものであり、発明の範囲を限定することは意図していない。これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で種々の省略、置き換え、変更を行うことができる。これらの実施形態やその変形は、発明の範囲や要旨に含まれると共に、特許請求の範囲に記載された発明とその均等の範囲に含まれる。   Although several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

図面中、１はフレーム、３は回転子、１４はファン、１６はファンカバー、２２はエンコーダ、２３は回り止め金具、２５はトップカバー、２６はボトムカバー、２７は回り止め用突起を示す。   In the drawings, 1 is a frame, 3 is a rotor, 14 is a fan, 16 is a fan cover, 22 is an encoder, 23 is an anti-rotation bracket, 25 is a top cover, 26 is a bottom cover, and 27 is a rotation prevention projection.

Claims (3)

回転電機の回転軸に取り付けられるエンコーダの固定部を、回り止めするための構造であって、
前記回転電機側と前記固定部との一方に取り付けられる突起部材と、他方に取り付けられ、前記突起部材の長手方向において少なくとも周方向の二方を挟む形状を成す係止部材とからなり、
前記係止部材の周方向幅寸法は、前記突起部材の周方向幅寸法よりも長く、
前記係止部材に前記突起部材を係止させることで、前記固定部を回り止めするエンコーダの回り止め構造。 A structure for preventing rotation of a fixed portion of an encoder attached to a rotating shaft of a rotating electrical machine,
A projecting member attached to one of the rotating electrical machine side and the fixed portion; and a locking member attached to the other and having a shape sandwiching at least two circumferential directions in the longitudinal direction of the projecting member,
The circumferential width dimension of the locking member is longer than the circumferential width dimension of the protruding member,
An encoder rotation preventing structure that locks the fixed portion by locking the protruding member to the locking member. 前記回転電機が回転子部分にファンを備えている際に、
前記突起部材と前記係止部材との何れか一方は、前記回転電機のファンカバーに取り付けられる請求項１記載のエンコーダの回り止め構造。 When the rotating electrical machine has a fan in the rotor part,
2. The structure for preventing rotation of an encoder according to claim 1, wherein one of the protruding member and the locking member is attached to a fan cover of the rotating electrical machine. 前記突起部材は、前記固定部に取り付けられ、
前記係止部材は、前記回転電機側に取り付けられる請求項１又は２記載のエンコーダの回り止め構造。 The protruding member is attached to the fixing portion,
The encoder detent structure according to claim 1 or 2, wherein the locking member is attached to the rotating electrical machine side.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0487541A (en) * 1990-07-25 1992-03-19 Mitsubishi Electric Corp Encoder fixing device for motor
JP2012147550A (en) * 2011-01-11 2012-08-02 Nippon Densan Corp Motor
CN203537182U (en) * 2013-11-22 2014-04-09 乐清市中洋电子科技有限公司 Integral structure of servo motor and servo coder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0487541A (en) * 1990-07-25 1992-03-19 Mitsubishi Electric Corp Encoder fixing device for motor
JP2012147550A (en) * 2011-01-11 2012-08-02 Nippon Densan Corp Motor
CN203537182U (en) * 2013-11-22 2014-04-09 乐清市中洋电子科技有限公司 Integral structure of servo motor and servo coder

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