JPH0211894A - Bearing device for electric blower and magnetizing method for permanent magnet used in this bearing device - Google Patents
Bearing device for electric blower and magnetizing method for permanent magnet used in this bearing deviceInfo
- Publication number
- JPH0211894A JPH0211894A JP63161576A JP16157688A JPH0211894A JP H0211894 A JPH0211894 A JP H0211894A JP 63161576 A JP63161576 A JP 63161576A JP 16157688 A JP16157688 A JP 16157688A JP H0211894 A JPH0211894 A JP H0211894A
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- bearing
- rotor
- load side
- fan
- 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
Links
- 238000000034 method Methods 0.000 title claims description 7
- 230000001846 repelling effect Effects 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 230000004907 flux Effects 0.000 description 9
- 230000005415 magnetization Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000010407 vacuum cleaning Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C39/00—Relieving load on bearings
- F16C39/06—Relieving load on bearings using magnetic means
- F16C39/063—Permanent magnets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
- F16C27/04—Ball or roller bearings, e.g. with resilient rolling bodies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/0408—Passive magnetic bearings
- F16C32/0423—Passive magnetic bearings with permanent magnets on both parts repelling each other
- F16C32/0429—Passive magnetic bearings with permanent magnets on both parts repelling each other for both radial and axial load, e.g. conical magnets
- F16C32/0431—Passive magnetic bearings with permanent magnets on both parts repelling each other for both radial and axial load, e.g. conical magnets with bearings for axial load combined with bearings for radial load
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/44—Centrifugal pumps
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本究明は、真空掃除、幾などに使用する電動送風機の磁
気軸受装置並びに同１磁気軸受装置に用いる磁石の着磁
方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This research relates to a magnetic bearing device for an electric blower used for vacuum cleaning, blowing, etc., and a method of magnetizing a magnet used in the same magnetic bearing device.
従来の技術
従来の真空掃除機用電動送風機は、第６図に示すように
（実公昭５５−１６１５９号公報）、ブラケット１とモ
ータハウジング４内にローター３が、ボールベアリング
５にて保持されている。2. Description of the Related Art In a conventional electric blower for a vacuum cleaner, a rotor 3 is held within a bracket 1 and a motor housing 4 by a ball bearing 5, as shown in FIG. There is.
発明が解決しようとする課題
従来の電動送風機は、ローター３やファン９のアンバラ
ンスが回転によりボールベアリング５を介してプラケッ
ト１とモータノ・ウジング４に伝わって振動となり、真
空掃除機の振動音となっていた。静かな掃除機を実現し
ようとすると、ロータ３ノ＼−／
−や、ファンのアンバランスを高精度に取るために設備
コストがかさんだり、モータを真空掃除機内で保持する
防振ゴムにコストを多くかけたりしなければならないと
いう問題点があった。Problems to be Solved by the Invention In conventional electric blowers, the unbalance of the rotor 3 and fan 9 is transmitted to the bracket 1 and motor housing 4 through the ball bearing 5 due to rotation, resulting in vibrations and the vibration noise of the vacuum cleaner. It had become. When trying to create a quiet vacuum cleaner, equipment costs increase to accurately balance the rotor 3 and the fan, and the vibration isolating rubber that holds the motor inside the vacuum cleaner costs a lot of money. There was a problem in that a large number of times had to be applied.
本発明は、ローターやファンに多少のアンバランスがあ
っても、ローター、ファンの回転アンバランス振動がモ
ータブラケットに伝わらず、振動の少ない静かな電動送
風機を得ることを目的としている。An object of the present invention is to obtain a quiet electric blower with less vibration, in which even if there is some unbalance in the rotor or fan, the unbalanced rotational vibration of the rotor or fan is not transmitted to the motor bracket.
課題を解決するための手段
上記目的を達成するために、本発明の電動送風機におい
ては、ローターの軸受を永久磁石を用いて、磁力により
空中に浮かせた空気軸受で構成したものである。Means for Solving the Problems In order to achieve the above object, in the electric blower of the present invention, the rotor bearing is constructed of an air bearing that is suspended in the air by magnetic force using a permanent magnet.
上記磁気軸受のローター側には、シャフトに小形のポー
ルベアリングを内蔵し、その外側に永久磁石を設けたも
のが、ローターの両端に設けられる。モーターの負荷側
（ファン側）ブラケットには、ローター側の永久磁石と
は反磁性に着磁された永久磁石が設置され、永久磁石は
反発し合う。On the rotor side of the magnetic bearing, a small pole bearing is built into the shaft, and permanent magnets are provided on the outside of the pole bearing, which are installed at both ends of the rotor. A permanent magnet that is magnetized diamagnetically from the permanent magnet on the rotor side is installed on the load side (fan side) bracket of the motor, and the permanent magnets repel each other.
モーターの反負荷側ブラケットには、スラスト方向には
ローター側の永久磁石と異極に、ラジアル方向は、ロー
ター側の永久磁石と同極に着磁された永久磁石が設置さ
れる。A permanent magnet is installed on the anti-load side bracket of the motor, and is magnetized to have a different polarity from the permanent magnet on the rotor side in the thrust direction and the same polarity as the permanent magnet on the rotor side in the radial direction.
そして上記永久磁石は環状で、断面がコの字形状とし、
ブラケット側の永久磁石より、ロータ側の永久磁石を１
回り小さくし、その外側をブラケット側の永久磁石が覆
うようにしである。この永久磁石の着磁は、ローターの
負荷側永久磁石を外面スジスト方向、ラジアル方向とも
Ｎ極、内面Ｓ極とし、負荷側ブラケットの永久磁石をス
ラスト方向、ラジアル方向とも外面Ｓ極、内面Ｎ極とし
、ローターの反負荷側永久磁石をスラスト方向外面Ｓ極
、内面Ｎ極、ラジアル方向外面Ｎ極、内面Ｓ極、反負荷
側ブラケットの永久磁石をスラスト方向、ラジアル方向
とも外面Ｓ１ｉ、内面１マ極としである。このローター
反負荷側磁石の着磁ば、断面略Ｅ形の環状の着磁ヨーク
の中央部に着磁コイルが巻いてあり、その中央にロータ
ー負荷側の永久磁石用コアーを乗せ、さらにその上内側
に、５ヘー。The permanent magnet is annular and has a U-shaped cross section,
Place the permanent magnet on the rotor side 1 higher than the permanent magnet on the bracket side.
The rotation is made small, and the permanent magnet on the bracket side covers the outside. The permanent magnets are magnetized such that the load-side permanent magnet of the rotor has an N pole on the outer surface and an S pole on the inner surface in both the thrust direction and the radial direction, and the permanent magnet on the load side bracket has an S pole on the outer surface and a N pole on the inner surface in both the thrust direction and the radial direction. The permanent magnet on the anti-load side of the rotor has an S pole on the outer surface in the thrust direction, an N pole on the inner surface, an N pole on the outer surface in the radial direction, and an S pole on the inner surface. This is the extreme. When magnetizing the rotor anti-load side magnets, a magnetizing coil is wound around the center of an annular magnetizing yoke with an approximately E-shaped cross section, and a permanent magnet core on the rotor load side is placed in the center of the annular magnetizing yoke. Inside, 5 he.
円筒状のヨークを乗せて着磁を行なう着磁方法である。This is a magnetization method in which magnetization is performed using a cylindrical yoke.
作 用
上記のように構成された電動送風機を運転すると、ロー
ターの回転により、ファンが空気の吸弓を打力う。この
ため、ファンはその吸引力により前方へ引っばられる。Operation When the electric blower configured as described above is operated, the rotation of the rotor causes the fan to suck air. Therefore, the fan is pulled forward by its suction force.
このだめ、ローターは負荷側へ引かれるが、ローター負
荷側の永久磁石外面が、スラスト方向、ラジアル方向と
もＮ極、負荷側プラケットの永久磁石内面が、スラスト
方向。In this case, the rotor is pulled toward the load side, but the outer surface of the permanent magnet on the load side of the rotor is the N pole in both the thrust and radial directions, and the inner surface of the permanent magnet on the load side placket is in the thrust direction.
ラジアル方向ともＮ極と同極のため、反発して、ファン
の吸引力にさからう。また、ローターのアンバランスに
よる心ブレに対しても、反発力により、ローターは空中
に浮く。Since it has the same polarity as the north pole in both the radial direction, it will repel and interfere with the suction force of the fan. In addition, even when the rotor is unbalanced, the rotor floats in the air due to the repulsive force.
ローター反負荷側の永久磁石と、反負荷側ブラケットの
永久磁石は、スラスト方向は異極で引き合うため、ファ
ンの吸引力にさからって、ローターを後方へ引っばり、
負荷側磁石の反発力と合わせて、ローターを後方へ保持
することに々るが、ファンの吸引力より、反負荷側磁石
の吸着力を弱６ ヘー／
く設定してあＳため、ローターはすこし前方へ動いた所
で、負荷側磁石の反発力が加わって空中に止まる。ラジ
アル方向は同極のため、負荷側と同じく反負荷側も、ロ
ーターは空中に浮く。The permanent magnet on the anti-load side of the rotor and the permanent magnet on the anti-load side bracket have different polarities in the thrust direction and attract each other, so they pull the rotor backward against the suction force of the fan.
Together with the repulsive force of the load-side magnet, the rotor is often held backwards, but the attraction force of the anti-load-side magnet is set to 6 Hz, which is weaker than the fan's attraction force. When it moves forward a little, the repulsive force of the load side magnet is applied and it stops in the air. Since the radial direction is the same polarity, the rotor floats in the air on the load side as well as on the anti-load side.
このため、ファンやローターのアンバランスによる、ロ
ーターシャフトの回転感動は、プラケットへほとんど伝
わらず、非常に低振動な運転が得られる。寸だローター
シャフトには小形のボールベアリングが内蔵されている
ため、回転起動時の大きなローターへの偏荷重に対して
、磁気軸受が力負けして、接触しても、スムーズに回転
し、磁気軸受が破（ｂするよう々ことはない。軸受は回
転摺動部かたいため、寿命も大巾に長く々る。For this reason, the rotation of the rotor shaft due to unbalanced fan or rotor is hardly transmitted to the placket, resulting in extremely low-vibration operation. The small rotor shaft has a built-in small ball bearing, so even if the magnetic bearing succumbs to the unbalanced load on the large rotor when it starts rotating and makes contact, it rotates smoothly and the magnetic bearing There is no chance of the bearing breaking.Since the rotating and sliding parts of bearings are hard, their lifespan is significantly longer.
永久磁石は、その形状のまま、スラスト方向とラジアル
方向を異極で一体的に着磁でき、その磁性材料は、同極
に着磁される。負荷側ローターの永久磁石と同一にでき
、部品の共用化が図れ、これと対をなすブラケット側の
永久磁石も負荷側。The permanent magnet can be integrally magnetized with different polarities in the thrust direction and the radial direction while maintaining its shape, and its magnetic material is magnetized with the same polarity. It can be made the same as the permanent magnet on the load side rotor, allowing parts to be shared, and the permanent magnet on the bracket side that is paired with this is also on the load side.
反負荷側が共用化できるため、組合わせ寸法の精度向上
が図れる。Since the anti-load side can be shared, the precision of the combined dimensions can be improved.
了 ヘ一／ 実施例 以下、その実施例を図面を参照して説明する。Completed Heichi/ Example Examples thereof will be described below with reference to the drawings.
第１図において、反負荷側プラケット２１と負荷側（フ
ァン側）プラケット２２の内部にローター２３とステー
ター２４を内蔵し、反負荷側プラケット２１の後方には
ブラシ２６を内蔵したプラシホ／Ｌ＝ダ−２６が固定さ
れている。ブラシ２６はローター２３の整流子２アに描
接している。ロタ−２３の負荷側シャフト２８にはファ
ン２９が固着され、その外側をケーシング３０が覆って
いる。ケーシング３ｏの中央部にはファン２９の吸気口
３１に対向して、開口３２が設けられ、反負荷側プラケ
ット２１の後方には排気口３３が設けである。In FIG. 1, a rotor 23 and a stator 24 are built inside the counter-load side bracket 21 and the load-side (fan side) bracket 22, and a brush 26 is built in behind the counter-load side bracket 21. -26 is fixed. The brush 26 is in close contact with the commutator 2a of the rotor 23. A fan 29 is fixed to the load-side shaft 28 of the rotor 23, and a casing 30 covers the outside of the fan 29. An opening 32 is provided in the center of the casing 3o, facing the intake port 31 of the fan 29, and an exhaust port 33 is provided at the rear of the anti-load side placket 21.
上記構成において、電動機を運転すると、ロタ−２３の
回転にともないファン２９もともに回転する。空気は開
口３２よりファン２９の吸気口３１へ吸い込１れ、ファ
ン２９の外周より負荷側プラケットの外周を通って電動
機内部へ至る。電動機内部で、ローター２３．ステータ
ー２４．整流子２７．ブラシ２５を冷却して、排気口３
３より排出される。In the above configuration, when the electric motor is operated, the fan 29 also rotates as the rotor 23 rotates. Air is sucked into the intake port 31 of the fan 29 through the opening 32, passes from the outer periphery of the fan 29, passes through the outer periphery of the load side placket, and reaches the inside of the motor. Inside the electric motor, rotor 23. Stator 24. Commutator 27. After cooling the brush 25, the exhaust port 3
It is discharged from 3.
第２図に、ローター２３の軸受部（負荷側３４゜反負荷
１ｔ１１．ｌｌ ３６ ）を記載し、その内容について
説明する。負荷側シャフト２８には小形のボールベアリ
ング３６が圧入され、その外側を断面コの字状の円節の
永久磁石３７が固着されている。その外側を覆って永久
磁石３８が永久磁石３７と空隙を保って負荷側プラケッ
ト２２に固着されている。FIG. 2 shows the bearing portion of the rotor 23 (load side 34° opposite load 1t11.ll 36 ), and its contents will be explained. A small ball bearing 36 is press-fitted into the load-side shaft 28, and a circular permanent magnet 37 having a U-shaped cross section is fixed to the outside thereof. A permanent magnet 38 is fixed to the load side placket 22 so as to cover the outside thereof and maintain a gap with the permanent magnet 37.
永久磁石３７の着磁ば、その内側をスラスト方向ラジア
ル方向ともＮ極に、外側をＳ極に着磁し、永久磁石３８
を、この逆に内側をスラスト方向。When the permanent magnet 37 is magnetized, the inner side is magnetized to the N pole in both the thrust and radial directions, and the outer side is magnetized to the S pole.
, this is reversed in the thrust direction.
ラジアル方向ともＳ極に外側をＮ極に着磁しである。捷
だ、磁石の中央部は円形の開口部３了ａ。It is magnetized to S pole in both radial directions and N pole on the outside. Well, the center of the magnet has a circular opening.
３８ａが設けである。38a is provided.
反負荷側軸受部３５ば、上記負荷側軸受部３４と同一の
構成で、ローター２３の反負荷側シャフト３９に小形の
ボールベアリング４ｏが圧入され、その外側に永久磁石
４１が固着きれ、その外側を覆って永久磁石４２が永久
磁石４１に空隙を保つ９ ヘ一／′
て反負荷側ブラケット２１に固着されている。永久磁石
の着磁は、永久磁石４１はその外側スラスト方向をＳ極
に、ラジアル方向外側をＮ極に着磁し、永久磁石４２は
、その内側スラスト方向をＮ極に、ラジアル方向内側を
同じくＮ極に着磁しである。そしてその中央には円形の
開口部４１ａ。The anti-load side bearing section 35 has the same structure as the above-mentioned load side bearing section 34, and a small ball bearing 4o is press-fitted into the anti-load side shaft 39 of the rotor 23, and a permanent magnet 41 is fixed to the outside of the ball bearing 4o. A permanent magnet 42 is fixed to the anti-load side bracket 21 covering the permanent magnet 41 to maintain an air gap. The permanent magnets are magnetized such that the outer thrust direction of the permanent magnet 41 is the S pole and the radially outer side thereof is the N pole. It is magnetized to the north pole. And in the center is a circular opening 41a.
４２ａが設けである。42a is provided.
上記構成により、ローター２３は永久磁石３了。With the above configuration, the rotor 23 has three permanent magnets.
３８の反発により、反負荷側へ押され、負荷側は空隙を
保って空中に浮く。反負荷側軸受は、永久磁石４１．４
２がスラスト方向が異極のため引っ張り合って吸着する
。ラジアル方向は同極のため、反発し合い空隙を保つ。Due to the repulsion of 38, it is pushed toward the anti-load side, and the load side floats in the air while maintaining an air gap. The anti-load side bearing is a permanent magnet 41.4
2 have different thrust directions, so they pull together and attract each other. Since the radial direction is the same polarity, they repel each other and maintain a gap.
モーターが通電されてロタ−２３が回転し始めると、フ
ァン２９が吸気口３１より空気を吸引するため、その吸
引力によりファン２９は前方へ吸い寄せられ、ローター
２３も負荷側へ引っ張られる。このためローター２３は
前方へ移動し、ファン２９の吸引力と、永久磁石３７．
３８の反発力に加えて、永久磁石４１゜４２の吸着力が
つり合った所で止まり、ロータ１０ ヘ一／
２３は空中に浮いた一！捷回転を続ける。ローター２３
とファン２９のアンバランスにより、ロータ２３のシャ
ツ）２８，３９が振動しても、この撮動は永久磁石３７
．４１と３８．４２の空隙に吸収され、外側の永久磁石
３８．４２には伝わらない。このため電動送風機は非常
に低振動とカリ、静か々真空掃除機を得ることができる
。When the motor is energized and the rotor 23 begins to rotate, the fan 29 sucks air from the intake port 31, and the fan 29 is drawn forward by the suction force, and the rotor 23 is also pulled toward the load side. Therefore, the rotor 23 moves forward, and the attraction force of the fan 29 and the permanent magnet 37.
In addition to the repulsive force of 38, the attraction force of permanent magnets 41 and 42 is balanced, and the rotor stops, and the rotor 10/23 floats in the air! Continue spinning. Rotor 23
Even if the shirts 28 and 39 of the rotor 23 vibrate due to the unbalance of the fan 29 and the
．． It is absorbed by the gap between 41 and 38.42 and is not transmitted to the outer permanent magnet 38.42. Because of this, the electric blower has very low vibration and potency, and you can get a quiet vacuum cleaner.
ローター２３に外部より力が加わった場合、磁石の反発
がこれらの力に負けて永久磁石３７ 、４１と３８．４
２が接触する場合があり、この時は、小形のボールベア
リング３６．４０が一時的に回転を引受け、ローター２
３の振動は外部へ伝わることになるが、回転そのものは
支障々く打力われる。小形のボールベアリング３６．４
０はほんの短時間の使用に耐えればよく、小形化が図れ
る。When external forces are applied to the rotor 23, the repulsion of the magnets is overcome by these forces and the permanent magnets 37, 41 and 38.4
2 may come into contact, and in this case, the small ball bearing 36, 40 temporarily takes over the rotation, and the rotor 2
Although the vibration of 3 will be transmitted to the outside, the rotation itself will be affected by the impact force. Small ball bearing 36.4
0 only needs to be used for a short time and can be made smaller.
永久磁石３了、３８．４２はその中央に開口３７ａ 、
３８ａ 、４２ａが設けであるため、磁石より出た磁束
は第３図のようになる。つまり磁石の中央を通る磁束Ｂ
と、磁石の外側を通る磁束Ｃが出来る。中央に開口がな
いと磁束Ｂは形成され１１ へ−７
ず、中央部の磁束は磁束Ｃと同じように、磁束Ｃの外側
を通って形成されるため、磁気通路が長くなり、磁石の
反発力が低下するが、本発明は中央に開口を設けたため
、磁気通路が短かく形成され、反発力が強い。Permanent magnet 3, 38.42 has an opening 37a in its center,
Since 38a and 42a are provided, the magnetic flux emitted from the magnet is as shown in FIG. In other words, the magnetic flux B passing through the center of the magnet
Then, a magnetic flux C is created that passes through the outside of the magnet. If there is no opening in the center, the magnetic flux B will not be formed, and the magnetic flux in the center will pass through the outside of the magnetic flux C, just like the magnetic flux C. Therefore, the magnetic path will be longer and the repulsion of the magnet will increase. Although the force is reduced, since the present invention has an opening in the center, the magnetic path is short and the repulsive force is strong.
磁石４１は、第４図に示すように磁束はり、Ｅ。The magnet 41 has a magnetic flux beam E as shown in FIG.
Ｆ、Ｇの４種が形成され、いづれも、第３図よりは磁気
通路が短かく形成され、そのうちのり、Ｅがラジアル方
向の反発を、Ｄ、Ｆがスラスト方向の吸着を生み出す。Four types, F and G, are formed, and each type has a shorter magnetic path than the one shown in Fig. 3. Of these, Glue and E produce repulsion in the radial direction, and D and F produce attraction in the thrust direction.
ファン２９の吸引力を、永久磁石３７と３８の反発と、
４１と４２の吸着の和でバランスするため、スラスト方
向の磁力は従来よりも小さくてもよく、磁石の小形化が
図れる。The attraction force of the fan 29 is the repulsion of the permanent magnets 37 and 38,
Since it is balanced by the sum of the attractions of 41 and 42, the magnetic force in the thrust direction may be smaller than that of the conventional one, and the magnet can be made smaller.
第６図で、軸受に使用する永久磁石４１の着磁方法につ
いて説明する。断面略Ｅ字状の環状ヨーク４３の中央に
着磁コイル４４が巻いてあり、ヨーク４３の中央ボス４
５は永久磁石４１の下に接する。永久磁石４１の外周を
ヨーク４３が取りまき、内側にはリング状のヨーク４６
が接する。With reference to FIG. 6, a method of magnetizing the permanent magnet 41 used in the bearing will be explained. A magnetizing coil 44 is wound around the center of an annular yoke 43 having a substantially E-shaped cross section.
5 is in contact with the bottom of the permanent magnet 41. A yoke 43 surrounds the outer periphery of the permanent magnet 41, and a ring-shaped yoke 46 is arranged inside.
touches.
上記構成により、着磁コイル４４に通電すると、磁束は
中央ボス４５より、永久磁石４１の下側から上へ、ヨー
ク４６を通り、その外周から、再び永久磁石４１の内側
から外側へ、そしてヨーク４３へ帰っていく。永久磁石
４１は、全周はぼ均一て着磁される。With the above configuration, when the magnetizing coil 44 is energized, the magnetic flux flows from the central boss 45, from the bottom to the top of the permanent magnet 41, through the yoke 46, from its outer periphery, from the inside to the outside of the permanent magnet 41, and then back to the yoke. I'm going back to 43. The permanent magnet 41 is magnetized almost uniformly around the entire circumference.
このように、−回の着磁で、外周と端面を一体的に着磁
でき、着磁時間を短縮することができる。In this way, the outer periphery and end face can be integrally magnetized by - times of magnetization, and the magnetization time can be shortened.
発明の効果
本発すは、以上説明したように構成されており、以下に
記載されるよう力効果を奏する。Effects of the Invention The present invention is constructed as described above, and produces the effects as described below.
ローターの軸受を小形のボールベアリングと、中央に開
口を設けた断面コの字状の永久磁石を用いた磁気軸受で
構成したため、通常運転時は振動を非常に小さくでき、
静か力真空掃除機が得られ、また起動時等のローターに
大きな負荷がかかる時は、ボールベアリングにより一時
的に回転を引受けるため、軸受の信頼性は大きく向上す
る。さらに、永久磁石の構成を、スラスト方向に、負荷
側は反発、反負荷側は吸着としたため、ファン回転時の
吸引力によりローターが負荷側へ引きつけら１３ ヘー
ノ
れる力を、負荷側９反負荷側両方の磁石にて分担して受
けるため、個々の磁石の磁力はさほど強くなくても良い
ため、全体に小形に形成できる。The rotor bearing is composed of a small ball bearing and a magnetic bearing using a permanent magnet with a U-shaped cross section with an opening in the center, so vibrations can be kept very low during normal operation.
A quiet vacuum cleaner can be obtained, and when a large load is applied to the rotor, such as during startup, the ball bearing temporarily takes over the rotation, greatly improving the reliability of the bearing. Furthermore, since the permanent magnet is configured in the thrust direction, with the load side repelling and the anti-load side attracting, the rotor is attracted to the load side by the attraction force when the fan rotates. Since the magnetic force is shared between both side magnets, the magnetic force of each individual magnet does not need to be very strong, so the overall size can be made smaller.
また、反負荷側永久磁石の、スラスト方向を吸着、ラジ
アル方向を反発にさせる異極着磁を一体的に一回の着磁
でできるため、低コストで信頼性の高い磁気軸受用永久
磁石を得ることができる。In addition, different polarity magnetization of the anti-load side permanent magnet, which attracts in the thrust direction and repulses in the radial direction, can be achieved in a single magnetization process, making it possible to create a low-cost and highly reliable permanent magnet for magnetic bearings. Obtainable.
第１図は本発明の実施例を示す真空掃除機用電動送風機
の断面図、第２図は同軸受部の部分断面図、第３図、第
４図は同永久磁石の断面図、第６図は同永久磁石の着磁
方法を示す断面図、第６図は従来例を示す電動送風機の
部分断面図である。
２３・・・・・・ローター、２４・・・・・スフ−ター
、３４・・・・負荷側軸受部、３５・・・・・・反負荷
側軸受部、３６・・・・・・ボールベアリング、３７，
３８，４１．４２・・・・・・永久磁石、４３．４６・
・・・・・ヨーク、４４・・・・・・着磁コイル。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名蹄。
さ
き ハ
Ｃ’Ｊ
粍１
躯さ
」ハ
１１宙
ｋＯて Ｘ
褌ペロ“椅へ
区１ ぎ伴
禎ｔ７１ ｇ−ｅ−ｍFig. 1 is a cross-sectional view of an electric blower for a vacuum cleaner showing an embodiment of the present invention, Fig. 2 is a partial cross-sectional view of the same bearing part, Figs. The figure is a cross-sectional view showing a method of magnetizing the permanent magnet, and FIG. 6 is a partial cross-sectional view of a conventional electric blower. 23...Rotor, 24...Shooter, 34...Load side bearing part, 35...Counter load side bearing part, 36...Ball bearing, 37,
38,41.42...Permanent magnet, 43.46.
... Yoke, 44 ... Magnetizing coil. Name of agent: Patent attorney Toshio Nakao and one other person. Saki HaC'J 粍1 体」Ha11空kOte
Claims (2)
のローターの両端に、ころがり軸受と、その外側に断面
コの字状で円筒形状、中央部に開口を有した永久磁石を
固着し、その外側に上記永久磁石と同形状で、該永久磁
石より１回り大きく、かつ該永久磁石より外周に隙間を
設けた永久磁石をモータブラケット側にそれぞれ設け、
永久磁石の着磁は、外周方向を同極どうしとして反発さ
せるとともに、スラスト方向は、ファン側の軸受を同極
で反発させ、反ファン側は異極で吸着させてなる電動送
風機の軸受装置。(1) A suction fan is installed on one side of the electric motor, and a rolling bearing is fixed to both ends of the rotor of the electric motor, and a permanent magnet with a cylindrical U-shaped cross section and an opening in the center is fixed to the outside of the bearing. A permanent magnet having the same shape as the permanent magnet, one size larger than the permanent magnet, and having a gap on the outer periphery of the permanent magnet is provided on the motor bracket side, respectively;
The permanent magnet is magnetized by repelling the outer circumferential direction with the same polarity, and in the thrust direction, the bearing on the fan side is repelled with the same polarity, and the opposite polarity attracts the bearing on the opposite side of the fan.A bearing device for an electric blower.
イルを巻き、この中央ボスの上に反ファン側永久磁石を
円筒状磁石の端面が中央ボス側になるように置き、同磁
石の外周は、前記断面略Ｅ字状ヨークの外側が接する寸
法とし、この永久磁石の内側にリング状の別ヨークを内
接させて着磁を行なう電動送風機の軸受装置に用いる永
久磁石の着磁方法。(2) A magnetizing coil is wound around the center boss of an annular yoke with a roughly E-shaped cross section, and a permanent magnet on the anti-fan side is placed on top of this center boss with the end face of the cylindrical magnet facing the center boss. The outer periphery of the magnet is dimensioned so that the outside of the yoke, which has a substantially E-shaped cross section, comes in contact with the permanent magnet. magnetic method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63161576A JPH0211894A (en) | 1988-06-29 | 1988-06-29 | Bearing device for electric blower and magnetizing method for permanent magnet used in this bearing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63161576A JPH0211894A (en) | 1988-06-29 | 1988-06-29 | Bearing device for electric blower and magnetizing method for permanent magnet used in this bearing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0211894A true JPH0211894A (en) | 1990-01-16 |
Family
ID=15737745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63161576A Pending JPH0211894A (en) | 1988-06-29 | 1988-06-29 | Bearing device for electric blower and magnetizing method for permanent magnet used in this bearing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0211894A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0824221A3 (en) * | 1996-08-14 | 1998-03-25 | Konica Corporation | Silver halide color photographic light sensitive material |
| DE102012009635A1 (en) * | 2012-05-14 | 2013-11-14 | Herbert Weh | Magnet arrangement for contactless support of fixed or movable objects or vehicles, has interacting magnet partners, which are used for multiplication of capacity expansion of magnet arrangement in lateral direction |
| CN114429849A (en) * | 2022-01-26 | 2022-05-03 | 江苏南方永磁科技有限公司 | Full-automatic device for magnetizing sintered neodymium-iron-boron magnet |
-
1988
- 1988-06-29 JP JP63161576A patent/JPH0211894A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0824221A3 (en) * | 1996-08-14 | 1998-03-25 | Konica Corporation | Silver halide color photographic light sensitive material |
| DE102012009635A1 (en) * | 2012-05-14 | 2013-11-14 | Herbert Weh | Magnet arrangement for contactless support of fixed or movable objects or vehicles, has interacting magnet partners, which are used for multiplication of capacity expansion of magnet arrangement in lateral direction |
| CN114429849A (en) * | 2022-01-26 | 2022-05-03 | 江苏南方永磁科技有限公司 | Full-automatic device for magnetizing sintered neodymium-iron-boron magnet |
| CN114429849B (en) * | 2022-01-26 | 2023-06-02 | 江苏南方永磁科技有限公司 | Full-automatic device for magnetizing sintered NdFeB magnet |
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