JPS6361866B2 - - Google Patents
Info
- Publication number
- JPS6361866B2 JPS6361866B2 JP12958581A JP12958581A JPS6361866B2 JP S6361866 B2 JPS6361866 B2 JP S6361866B2 JP 12958581 A JP12958581 A JP 12958581A JP 12958581 A JP12958581 A JP 12958581A JP S6361866 B2 JPS6361866 B2 JP S6361866B2
- Authority
- JP
- Japan
- Prior art keywords
- rotor shaft
- spring
- axial direction
- electric motor
- torque
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 9
- 230000005284 excitation Effects 0.000 description 6
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/102—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction brakes
- H02K7/1021—Magnetically influenced friction brakes
- H02K7/1023—Magnetically influenced friction brakes using electromagnets
- H02K7/1025—Magnetically influenced friction brakes using electromagnets using axial electromagnets with generally annular air gap
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Description
【発明の詳細な説明】
この発明は停止時に無励磁で押しつけトルクを
発生することができるようにした電動機に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric motor that can generate pressing torque without excitation when stopped.
多軸ボール盤のヘツド送り用電動機では、ヘツ
ドを一定位置で停止させた後、加工作業の終るま
で基準面に押しつけて保持する必要があるが、従
来は作業の終るまで電動機を励磁して押しつけト
ルクを発生させるようにしていたので、多くの電
力を消費するのみでなく、拘束時の冷却効果を増
すために電動機が大形化するという欠点があつ
た。このような停止時に押しつけトルクを発生さ
せる必要のある用途としてはほかにドア、ダンパ
の開閉用等多くのものがある。 With the electric motor for feeding the head of a multi-spindle drilling machine, it is necessary to stop the head at a fixed position and then hold it against the reference surface until the machining operation is completed, but conventionally, the electric motor is energized until the machining operation is completed to generate the pressing torque. This had the disadvantage that not only did it consume a lot of power, but the motor had to be larger in order to increase the cooling effect during restraint. There are many other applications that require the generation of pressing torque when stopping, such as opening and closing doors and dampers.
この発明は前記の欠点を除去するために、停止
時に無励時で押しつけトルクを発生することがで
きるようにした電動機を提供することを目的とす
る。 SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide an electric motor that can generate pressing torque when stopped and without excitation.
以下、この発明の実施例を図面にもとづいて説
明する。 Embodiments of the present invention will be described below based on the drawings.
第１図はこの発明による電動機を示すものであ
る。この図における電動機は、回転子１を嵌着し
た回転子軸２が出力軸３にねじ結合されている。
前記回転子軸２は軸受４および一対の軸受５を介
してブラケツト６と７に回転可能に支持され、軸
受４および外側の軸受５と回転子軸２、内側の軸
受５とブラケツト７とはそれぞれ回転子軸２が第
２図に矢印で示す軸方向に移動できるように〓間
を設けて嵌め込まれている。前記一対の軸受５の
外輪の間には回転子軸２を軸方向に付勢するコイ
ルばね８が予圧を加えて挿入されている。前記出
力軸３は軸受９を介してブラケツト６に回転のみ
可能に支持され、回転子軸２で回転駆動するよう
になつている。前記回転子軸２と出力軸３の端部
には互に螺合するリード角の大きいねじ２ａ，３
ａが設けられ、出力軸３に一定の負荷トルクが加
わると前記ねじ２ａ，３ａの作用でばね８を第２
図に示すように圧縮して回転子軸２を軸方向に移
動させ、同時に回転子軸２にばね８の復元方向の
推力を発生させる。前記ねじ２ａ，３ａはボール
ねじで実施することもでき、この場合にはねじ結
合部の摩擦力が小さいのでトルクと推力の変換を
効率よく行うことができる。 FIG. 1 shows an electric motor according to the invention. In the electric motor shown in this figure, a rotor shaft 2 on which a rotor 1 is fitted is screwed to an output shaft 3.
The rotor shaft 2 is rotatably supported by brackets 6 and 7 via a bearing 4 and a pair of bearings 5. The rotor shaft 2 is fitted with a gap provided so that it can move in the axial direction shown by the arrow in FIG. A coil spring 8 that biases the rotor shaft 2 in the axial direction is inserted between the outer rings of the pair of bearings 5 with a preload applied thereto. The output shaft 3 is rotatably supported by a bracket 6 via a bearing 9, and is rotatably driven by the rotor shaft 2. At the ends of the rotor shaft 2 and the output shaft 3, screws 2a and 3 with large lead angles are screwed into each other.
a is provided, and when a certain load torque is applied to the output shaft 3, the spring 8 is moved to the second position by the action of the screws 2a and 3a.
As shown in the figure, the rotor shaft 2 is compressed and moved in the axial direction, and at the same time, a thrust force is generated in the rotor shaft 2 in the direction of restoring the spring 8. The screws 2a, 3a can also be implemented as ball screws, and in this case, the frictional force of the screw joint is small, so that torque and thrust can be efficiently converted.
前記回転子軸２の出力軸３と反対側の端部には
回転子軸２の軸方向の移動量を検出する検出装置
１０が設けられている。この検出装置１０は回転
子軸２に取付けられた位置検出素子１０ａとブラ
ケツト７に固定取付けされた発信素子１０ｂとか
らなり、回転子軸２の軸方向移動量を無段階に検
出することができるようになつている。前記検出
装置１０とブラケツト７の間には回転子軸２の制
動作用を行う電磁ブレーキ１１が設けられてい
る。この電磁ブレーキ１１は回転制動円板１１ａ
を備え、この制動円板１１ａは回転子軸２に嵌着
された環状のセンターハブ１１ｂの外周にスプラ
イン等で軸方向にのみ移動可能に結合されて回転
子軸２が軸方向に移動しても支障のないようにな
つている。前記電磁ブレーキ１１は回転子軸２が
軸方向に一定量移動すると検出装置１０の作動に
応じて制動作用を行うようになつている。 A detection device 10 for detecting the amount of axial movement of the rotor shaft 2 is provided at the end of the rotor shaft 2 opposite to the output shaft 3. This detection device 10 consists of a position detection element 10a attached to the rotor shaft 2 and a transmitter element 10b fixedly attached to the bracket 7, and is capable of steplessly detecting the amount of axial movement of the rotor shaft 2. It's becoming like that. An electromagnetic brake 11 for braking the rotor shaft 2 is provided between the detection device 10 and the bracket 7. This electromagnetic brake 11 is a rotating brake disc 11a.
The brake disc 11a is connected to the outer periphery of an annular center hub 11b fitted to the rotor shaft 2 by splines or the like so that it can move only in the axial direction, so that the rotor shaft 2 moves in the axial direction. There seems to be no problem. The electromagnetic brake 11 performs a braking operation in response to the operation of the detection device 10 when the rotor shaft 2 moves a certain amount in the axial direction.
前記実施例によれば出力軸３で多軸ボール盤の
ヘツド等を基準面に押しつけて停止させると第３
図に示すように一定値T1を超える押しつけトル
クに比例して回転子軸２が軸方向に移動する。こ
の移動量Ｅにより検出装置１０で検出された押し
つけトルクは所要トルクT2と比較して誤差△Ｔ
が許容範囲内になるように調整され、この調整後
電磁ブレーキ１１が作動して回転子軸２を回転方
向にのみロツクし、同時に電動機の励磁を解くよ
うになつている。この無励磁の状態で回転子軸２
はばね８が圧縮され、かつ軸方向に移動可能にな
つているのでばね８の復元方向に推力を発生し、
ねじ２ａと３ａの作用で前記推力をトルクに変換
して出力軸３に所要トルクT2で押しつけ作用を
させることができる。 According to the embodiment, when the output shaft 3 presses the head of the multi-spindle drilling machine against the reference surface and stops it, the third
As shown in the figure, the rotor shaft 2 moves in the axial direction in proportion to the pressing torque exceeding the constant value T1 . The pressing torque detected by the detection device 10 based on this movement amount E has an error △T compared with the required torque T2 .
After this adjustment, the electromagnetic brake 11 is activated to lock the rotor shaft 2 only in the direction of rotation, and at the same time release the excitation of the motor. In this non-excited state, the rotor shaft 2
Since the spring 8 is compressed and is movable in the axial direction, a thrust is generated in the direction of restoring the spring 8,
The thrust force can be converted into torque by the action of the screws 2a and 3a, and can be pressed against the output shaft 3 with a required torque T2.
前記実施例では回転子軸２を一対の軸受５で支
持する場合について説明したが、第４図に示すよ
うに１個の軸受４５を回転子軸２に固着するとと
もに、ブラケツト４７に遊嵌し、前記軸受４５の
外輪の外側にばね８を配設するか、または第５図
に示すように１個の軸受５５をブラケツト５７に
固着するとともに、回転子軸２に遊嵌し、前記軸
受５５の内輪の内側にばね８を配設しても実施す
ることができる。これらの実施例によれば軸受４
５，５５の個数を減らすことができる。また回転
子軸２の軸方向移動量を無段階に検出する場合に
ついて説明したが、リミツトスイツチ等を１個な
いし複数使用して実施することもでき、さらに電
動機の一次電流の変動によつて検出することもで
きる。さらに停止時に無励磁で押しつけトルクを
発生することができるという効果について説明し
たが、急激停止による衝撃等の負荷トルクをばね
８で吸収して電動機の損傷を防止することもでき
る。 In the above embodiment, the rotor shaft 2 is supported by a pair of bearings 5, but as shown in FIG. , by disposing a spring 8 on the outside of the outer ring of the bearing 45, or by fixing one bearing 55 to a bracket 57 and loosely fitting it to the rotor shaft 2, as shown in FIG. It can also be implemented by disposing the spring 8 inside the inner ring of. According to these embodiments, the bearing 4
5,55 can be reduced. Furthermore, although the case has been described in which the amount of axial movement of the rotor shaft 2 is detected in a stepless manner, it can also be carried out using one or more limit switches, etc. Furthermore, detection can be performed by using fluctuations in the primary current of the motor. You can also do that. Furthermore, although the effect of being able to generate pressing torque without excitation when stopped has been described, it is also possible to prevent damage to the electric motor by absorbing load torque such as impact caused by sudden stopping with the spring 8.
以上述べたように、この発明によれば軸方向に
移動可能にばねで付勢した回転子軸を出力軸とそ
れぞれの端部にリード角の大きいねじを設けてね
じ結合するとともに、出力軸にトルクが加わると
前記ばねを圧縮して移動する回転子軸を回転方向
にのみロツクする電磁ブレーキを設けて電動機を
構成したので、押し当て停止時に無励磁でばねの
反力により押しつけトルクを発生し、従来の励磁
式に比べ消費電力を減らして小形化を可能にし、
さらに急激停止による衝撃等の負荷トルクをばね
で吸収して電動機の損傷を防止することができる
という効果が得られる。 As described above, according to the present invention, the rotor shaft, which is axially movable and biased by a spring, is screwed to the output shaft by providing screws with a large lead angle at each end. The electric motor is equipped with an electromagnetic brake that compresses the spring and locks the moving rotor shaft only in the rotational direction when torque is applied, so that when the push is stopped, the push torque is generated by the reaction force of the spring without excitation. , which reduces power consumption and enables miniaturization compared to conventional excitation type,
Furthermore, the spring absorbs the load torque caused by the impact caused by the sudden stop, thereby preventing damage to the electric motor.
第１図はこの発明による電動機を示す縦断面
図、第２図は第１図の動作説明図、第３図は押し
つけトルクと回転子軸の軸方向移動量との関係を
示す線図、第４図および第５図はこの発明による
他の実施例を示す要部の縦断面図である。
２……回転子軸、２ａ，３ａ……ねじ、３……
出力軸、８……ばね、１０……検出装置、１１…
…電磁ブレーキ。
FIG. 1 is a longitudinal sectional view showing the electric motor according to the present invention, FIG. 2 is an explanatory diagram of the operation of FIG. 4 and 5 are longitudinal sectional views of main parts showing other embodiments of the present invention. 2... Rotor shaft, 2a, 3a... Screw, 3...
Output shaft, 8... Spring, 10... Detection device, 11...
...Electromagnetic brake.
Claims (1)
にばねで付勢して支持し、この回転子軸で回転駆
動する出力軸と前記回転子軸をそれぞれの端部に
リード角の大きいねじを設けてねじ結合し、前記
出力軸に一定の負荷トルクが加わると前記ねじの
作用でばねに抗して軸方向に移動する回転子軸の
移動量を検出する検出装置と、前記移動量に応じ
て回転子軸を回転方向にのみロツクする電磁ブレ
ーキとを備えてなることを特徴とする電動機。1 A rotor shaft is supported by a spring so as to be rotatable and movable in the axial direction, and an output shaft rotationally driven by the rotor shaft and a screw with a large lead angle are attached to each end of the rotor shaft. a detection device for detecting the amount of movement of the rotor shaft, which is screwed together and moves in the axial direction against the spring by the action of the screw when a certain load torque is applied to the output shaft; An electric motor characterized in that it is equipped with an electromagnetic brake that locks a rotor shaft only in the direction of rotation according to the direction of rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12958581A JPS5833950A (en) | 1981-08-19 | 1981-08-19 | Motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12958581A JPS5833950A (en) | 1981-08-19 | 1981-08-19 | Motor |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1998682A Division JPS5833956A (en) | 1982-02-10 | 1982-02-10 | Motor |
| JP60221187A Division JPS61106040A (en) | 1985-10-04 | 1985-10-04 | Electric motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5833950A JPS5833950A (en) | 1983-02-28 |
| JPS6361866B2 true JPS6361866B2 (en) | 1988-11-30 |
Family
ID=15013084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12958581A Granted JPS5833950A (en) | 1981-08-19 | 1981-08-19 | Motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5833950A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015181900A1 (en) * | 2014-05-27 | 2015-12-03 | 株式会社安川電機 | Rotating electrical machine |
-
1981
- 1981-08-19 JP JP12958581A patent/JPS5833950A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5833950A (en) | 1983-02-28 |
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