JP2000197292A - Permanent-magnet rotor of permanent-magnet mounted motor - Google Patents
Permanent-magnet rotor of permanent-magnet mounted motorInfo
- Publication number
- JP2000197292A JP2000197292A JP11187835A JP18783599A JP2000197292A JP 2000197292 A JP2000197292 A JP 2000197292A JP 11187835 A JP11187835 A JP 11187835A JP 18783599 A JP18783599 A JP 18783599A JP 2000197292 A JP2000197292 A JP 2000197292A
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- rotor
- magnet type
- core
- magnetic 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.)
- Pending
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- Manufacture Of Motors, Generators (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、ブラシレスＤＣ
モータ等の永久磁石型電動機で使用される回転子に関
し、特に、回転子鉄心の内部に磁極用の複数個の永久磁
石を備えた永久磁石型回転子に関する。TECHNICAL FIELD The present invention relates to a brushless DC
The present invention relates to a rotor used in a permanent magnet type electric motor such as a motor, and more particularly to a permanent magnet type rotor having a plurality of permanent magnets for magnetic poles inside a rotor core.
【０００２】[0002]
【従来の技術】従来、この種の永久磁石型回転子として
は、たとえば、特開平６−３２３２９２号公報に開示さ
れたもの（図２５（ａ）参照）や、特開平９−２２４３
３８号公報（図２５（ｂ）参照）に開示されたものがあ
る。2. Description of the Related Art Conventionally, as this kind of permanent magnet type rotor, for example, one disclosed in Japanese Patent Application Laid-Open No. Hei 6-323292 (see FIG. 25A) and Japanese Patent Application Laid-Open No. 9-2243.
No. 38 (see FIG. 25 (b)).
【０００３】図２５（ａ）、（ｂ）に示されている永久
磁石型回転子は、いずれも４極の回転子の例であり、回
転子鉄心１００と、回転子鉄心１００の円周方向に極数
分等間隔に設けられた４個の矩形の磁石装着孔１０１の
それぞれに嵌め込み装着された永久磁石１０２とにより
構成されている。The permanent magnet type rotor shown in FIGS. 25 (a) and 25 (b) is an example of a four-pole rotor, and includes a rotor core 100 and a circumferential direction of the rotor core 100. And permanent magnets 102 fitted and mounted in four rectangular magnet mounting holes 101 provided at equal intervals for the number of poles.
【０００４】図２５（ａ）に示されている永久磁石型回
転子では、回転子鉄心１００の円周方向に互い隣接する
永久磁石１０２間に回転子鉄心１００の外周縁（ブリッ
ジ部１０３）を残して短絡防止用開口１０４が設けられ
ており、回転子鉄心１００は円形をなしている。この永
久磁石型回転子は、各永久磁石１０２と回転子鉄心１０
０の外周との間に領域に鉄心磁極部１０５を形成する。In the permanent magnet type rotor shown in FIG. 25A, the outer peripheral edge (bridge portion 103) of the rotor core 100 is provided between the permanent magnets 102 adjacent to each other in the circumferential direction of the rotor core 100. An opening 104 for preventing short circuit is provided, and the rotor core 100 has a circular shape. This permanent magnet type rotor is composed of each permanent magnet 102 and the rotor core 10.
An iron core pole portion 105 is formed in a region between the outer periphery of the core 0 and the outer periphery of the core.
【０００５】この永久磁石型回転子では、回転子鉄心１
００が円形であることから、固定子と固定子の内側に回
転可能に配置される回転子との間の空隙寸法は、回転子
全周に亙ってほぼ均一となる。In this permanent magnet type rotor, the rotor core 1
Since 00 is circular, the gap size between the stator and the rotor rotatably disposed inside the stator is substantially uniform over the entire circumference of the rotor.
【０００６】図２５（ｂ）に示されている永久磁石型回
転子では、回転子鉄心１００は上述のブリッジ部１０３
を省略された突極形状となっている。この永久磁石型回
転子では、ブリッジ部１０３がない部分において固定子
と回転子との間の空隙寸法が急激に変化する。In the permanent magnet type rotor shown in FIG. 25B, the rotor core 100 is
Are omitted in the salient pole shape. In this permanent magnet type rotor, the gap size between the stator and the rotor changes abruptly in a portion where the bridge portion 103 is not provided.
【０００７】図２６は、永久磁石型回転子の他の従来例
を示している。この永久磁石型回転子では、断面形状が
円弧状の永久磁石２０１が使用され、回転子鉄心２００
の円周方向に極数分の永久磁石２０１がそれぞれの凸部
側を回転子鉄心２００の中心側を向くように組み込まれ
ている。FIG. 26 shows another conventional example of a permanent magnet type rotor. In this permanent magnet type rotor, a permanent magnet 201 having an arc-shaped cross section is used.
In the circumferential direction, the permanent magnets 201 for the number of poles are incorporated so that the respective convex portions face the center of the rotor core 200.
【０００８】この永久磁石形回転子では、回転子鉄心２
００の外周面２０２を、これと対向する固定子鉄心２０
３の内周面２０４との間の空隙２０５の寸法が各磁極ご
とに磁極の周方向中央部に対応する部位から磁極間に対
応する部位に向かうに従って大きくなるように構成され
ている。In this permanent magnet type rotor, the rotor core 2
00 with the stator core 20 opposed thereto.
3 is configured such that the dimension of the gap 205 between the inner peripheral surface 204 and each magnetic pole increases from a portion corresponding to the circumferential center of the magnetic pole toward a portion corresponding to the space between the magnetic poles.
【０００９】[0009]
【発明が解決しようとする課題】図２５（ａ）、（ｂ）
に示されているような従来の永久磁石型回転子では、鉄
心磁極部１０５の形状からして、鉄心磁極部１０５ごと
の空隙の磁束密度分布が台形状、半楕円形状あるいはそ
れらに近い形状になるため、回転動作時のコギングトル
クが大きい。このため、回転動作時の振動や騒音が大き
くなり、これらを回避するためには、固定子鉄心をスキ
ューする等の対策をしなければならないと云う問題があ
る。FIG. 25 (a) and FIG. 25 (b)
In the conventional permanent magnet type rotor shown in FIG. 1, the magnetic flux density distribution of the air gap for each iron core magnetic pole portion 105 is trapezoidal, semi-elliptical or similar to the shape of the iron core magnetic pole portion 105. Therefore, the cogging torque during the rotation operation is large. For this reason, vibration and noise during the rotation operation increase, and in order to avoid these, there is a problem that measures such as skewing the stator core must be taken.
【００１０】図２６に示されているような従来の永久磁
石型回転子では、円弧状の永久磁石２０１の磁束が各円
弧の内径側に半楕円形状あるいはそれに近い形状になる
ため、空隙の寸法を変えるようにしても回転動作時のコ
ギングトルクを充分低下させることができず、また、円
弧状の永久磁石２０１の使用はコスト高を招くことにな
る。In the conventional permanent magnet type rotor as shown in FIG. 26, the magnetic flux of the arc-shaped permanent magnet 201 has a semi-elliptical shape or a shape close to the semi-elliptical shape on the inner diameter side of each arc. However, the cogging torque during the rotation operation cannot be sufficiently reduced even if the angle is changed, and the use of the arc-shaped permanent magnet 201 causes an increase in cost.
【００１１】この発明は、上述のような問題点を解消す
るためになされたものであり、コスト高を招くことな
く、コギングトルクが小さく、振動や騒音、ひいては回
転むらを小さくできる永久磁石型電動機の永久磁石型回
転子を得ることを目的としている。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a permanent magnet type electric motor capable of reducing cogging torque, vibration and noise, and rotation unevenness without increasing cost. It is intended to obtain a permanent magnet type rotor.
【００１２】[0012]
【課題を解決するための手段】上述の目的を達成するた
めに、この発明による永久磁石型電動機の永久磁石型回
転子は、回転子鉄心の円周方向に回転子の極数分等間隔
に設けられ鉄心周方向を長辺とし鉄心径方向を短辺とし
て軸方向に貫通する矩形の磁石装着孔を有し、前記磁石
装着孔のそれぞれに磁極面を鉄心径方向として互いに隣
接する磁極が異なるように永久磁石を装着され、前記永
久磁石のそれぞれの外周側磁極面に形成される鉄心磁極
部の外周形状が周方向中央部にて鉄心中心よりの距離が
最も大きくなり、極間部にて鉄心中心よりの距離が最も
小さくなるような各鉄心磁極部毎の円弧状をなしている
ものである。In order to achieve the above-mentioned object, a permanent magnet type rotor of a permanent magnet type electric motor according to the present invention is provided at equal intervals in the circumferential direction of a rotor core by the number of poles of the rotor. It has a rectangular magnet mounting hole penetrating in the axial direction with the iron core circumferential direction as the long side and the iron core radial direction as the short side, and each of the magnet mounting holes has a different magnetic pole adjacent to each other with the magnetic pole surface as the iron core radial direction. The permanent magnet is mounted as described above, and the outer peripheral shape of the core magnetic pole portion formed on each outer peripheral magnetic pole surface of the permanent magnet has the largest distance from the center of the iron core at the center in the circumferential direction, and at the gap between the poles Each core magnetic pole portion is formed in an arc shape such that the distance from the center of the iron core is minimized.
【００１３】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、鉄心中心と鉄心磁極部の周方向中央部
との径方向距離をＲａ、前記鉄心磁極部の外周円弧の半
径をＲｂ、前記鉄心中心と極間部との径方向距離をＲｐ
とした場合、Ｒａ＞Ｒｂで、０．５ｍｍ＜（Ｒａ−Ｒ
ｐ）＜５ｍｍの関係になるよう形成されているものであ
る。The permanent magnet type rotor of the permanent magnet type electric motor according to the present invention has a radial distance between the center of the iron core and a circumferential center of the iron core magnetic pole portion, and a radius Rb of an outer circumferential arc of the iron core magnetic pole portion. The radial distance between the center of the iron core and the gap between the poles is Rp
When Ra> Rb, 0.5 mm <(Ra−R
p) <5 mm.
【００１４】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、前記鉄心中心と鉄心磁極部の周方向中
央部との径方向距離をＲａ、前記鉄心磁極部の外周円弧
の半径をＲｂとし、回転子の極数を８極とした場合、
｛（０．８・Ｒａ）／２｝＜Ｒｂ＜｛（１．８・Ｒａ）
／２｝の関係になるように形成されているものである。The permanent magnet type rotor of the permanent magnet type electric motor according to the present invention is characterized in that the radial distance between the center of the iron core and the circumferential center of the iron core magnetic pole portion is Ra, and the radius of the outer circumferential arc of the iron core magnetic pole portion is Rb. When the number of poles of the rotor is eight,
{(0.8 · Ra) / 2} <Rb <｛(1.8 · Ra)
/ 2}.
【００１５】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、さらに、互いに隣接する前記永久磁石
間の最小寸法をＬａ、前記永久磁石の外周側磁極面と前
記鉄心磁極部の外周面との最小寸法をＬｂとした場合、
０．３ｍｍ＜Ｌａ＜３．０ｍｍで、０．３ｍｍ＜Ｌｂ＜
５．０ｍｍの関係になるように形成されているものであ
る。The permanent magnet rotor of the permanent magnet type electric motor according to the next invention further has a minimum dimension La between the adjacent permanent magnets, an outer peripheral magnetic pole surface of the permanent magnet and an outer peripheral surface of the iron core magnetic pole portion. When Lb is the minimum dimension of
0.3 mm <La <3.0 mm, and 0.3 mm <Lb <
It is formed so as to have a relationship of 5.0 mm.
【００１６】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、さらに、隣接する前記鉄心磁極部外周
の極間が小半径の円弧で連結されているものである。In the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, the adjacent poles of the outer periphery of the magnetic pole portion of the iron core are connected by an arc of a small radius.
【００１７】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、さらに、隣接する前記鉄心磁極部外周
の極間が半径Ｒｃによる円弧で連結された形状とされ、
前記磁石装着孔の外周側両端角部が半径Ｒｄによるアー
ル形状とされ、前記磁石装着孔の径方向寸法をＬｃとし
た場合、Ｒｃ＜（Ｒｂ／２）で、Ｒｄ＜Ｌｃの関係にな
るように形成されているものである。The permanent magnet type rotor of the permanent magnet type electric motor according to the next invention further has a shape in which the poles on the outer periphery of the adjacent magnetic core pole portion are connected by an arc having a radius Rc,
When the corners on both ends on the outer peripheral side of the magnet mounting hole are rounded with a radius Rd, and the radial dimension of the magnet mounting hole is Lc, the relationship of Rc <(Rb / 2) and Rd <Lc is satisfied. It is formed in.
【００１８】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、さらに、前記磁石装着孔の外周側両端
角部が半径Ｒｄによるアール形状とされ、前記磁石装着
孔の径方向寸法をＬｃとした場合、Ｒｄ＜Ｌｃの関係に
なるように形成されているものである。In the permanent magnet type rotor for a permanent magnet type electric motor according to the next invention, both corners on the outer peripheral side of the magnet mounting hole are rounded with a radius Rd, and the radial dimension of the magnet mounting hole is Lc. In this case, Rd <Lc.
【００１９】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、さらに、互いに隣接する前記磁石装着
孔の間に磁束短絡防止用の開口が軸方向に貫通して形成
されているものである。The permanent magnet type rotor of the permanent magnet type electric motor according to the next invention is further characterized in that an opening for preventing a magnetic flux short circuit is formed between the adjacent magnet mounting holes in an axial direction. is there.
【００２０】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、さらに、前記磁束短絡防止用の開口と
前記磁石装着孔との間の最小寸法をＬｄ、前記磁束短絡
防止用の開口と前記鉄心極間部の外周面との間の最小寸
法をＬｅとした場合、ＬｄとＬｅがほぼ等しく、０．３
ｍｍ＜（ＬｄおよびＬｅ）＜３ｍｍの関係になるように
前記磁束短絡防止用の開口が形成されているものであ
る。The permanent magnet type rotor of the permanent magnet type electric motor according to the next invention further comprises a minimum dimension Ld between the magnetic flux short circuit preventing opening and the magnet mounting hole, and a magnetic flux short circuit preventing opening. Assuming that the minimum dimension between the iron core gap and the outer peripheral surface is Le, Ld and Le are substantially equal, and 0.3
The opening for preventing the magnetic flux short-circuit is formed so as to satisfy a relation of mm <(Ld and Le) <3 mm.
【００２１】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、回転子鉄心は同一形状の鋼板の積層体
により構成され、前記鉄心磁極部外周の極間部がレーザ
溶接等により軸方向に溶接されていることにより一体化
されているものである。In the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, the rotor iron core is constituted by a laminated body of steel plates having the same shape, and the gap between the outer circumferences of the iron core magnetic poles is formed in the axial direction by laser welding or the like. Is integrated by being welded.
【００２２】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、さらに、前記永久磁石の配置部より内
側領域の回転子鉄心に軸方向に貫通する貫通孔が形成さ
れ、前記貫通孔を下錐孔として減量法により回転子の回
転バランス取りを行うものである。In the permanent magnet type rotor for a permanent magnet type electric motor according to the next invention, a through-hole penetrating in the axial direction is further formed in the rotor core in an area inside the portion where the permanent magnets are arranged, and the through-hole is formed. Rotation balance of the rotor is performed by a weight reduction method as a lower conical hole.
【００２３】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、さらに、前記永久磁石の配置部より内
側領域の回転子鉄心に軸方向に貫通する貫通孔が形成さ
れ、前記貫通孔に充填材を充填する増量法により回転子
の回転バランス取りを行うものである。In the permanent magnet type rotor for a permanent magnet type electric motor according to the next invention, a through-hole is formed in the rotor core in an area inside the portion where the permanent magnets are disposed, and the through-hole is formed in the axial direction. The rotation of the rotor is balanced by an increasing method of filling with a filler.
【００２４】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、さらに、前記磁石装着孔の周方向長さ
が前記永久磁石の周方向長さより大きく、前記永久磁石
を前記磁石装着孔の周方向のほぼ中央に固定する手段を
有しているものである。In the permanent magnet type rotor for a permanent magnet type electric motor according to the next invention, the circumferential length of the magnet mounting hole is larger than the circumferential length of the permanent magnet. It has a means for fixing at substantially the center in the circumferential direction.
【００２５】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、前記磁石装着孔に前記永久磁石が嵌め
込まれた後に、前記磁石装着孔の空隙にエポキシ系接着
剤等が注入され、前記永久磁石の固着が行われているも
のである。In the permanent magnet rotor of the permanent magnet motor according to the next invention, after the permanent magnet is fitted into the magnet mounting hole, an epoxy adhesive or the like is injected into the gap of the magnet mounting hole. The permanent magnet is fixed.
【００２６】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、前記磁石装着孔に沿って少なくとも１
ヶ所に拡張形成された凹部分を有し、前記磁石装着孔に
前記永久磁石が嵌め込まれた後に、前記凹部分にエポキ
シ系接着剤等が注入され、前記永久磁石の固着が行われ
ているものである。The permanent magnet type rotor of the permanent magnet type electric motor according to the next invention has at least one magnet along the magnet mounting hole.
The permanent magnet is fixed to the magnet mounting hole after the permanent magnet is fitted into the magnet mounting hole, and an epoxy adhesive or the like is injected into the concave portion to fix the permanent magnet. It is.
【００２７】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、さらに、前記永久磁石が前記磁石装着
孔に装着された状態で着磁されるものである。In the permanent magnet type rotor of the permanent magnet type electric motor according to the present invention, the permanent magnet is further magnetized in a state where the permanent magnet is mounted in the magnet mounting hole.
【００２８】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、さらに、前記永久磁石がネオジウム系
希土類磁石であるものである。In a permanent magnet rotor of a permanent magnet motor according to the next invention, the permanent magnet is a neodymium rare earth magnet.
【００２９】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、上述の発明による永久磁石型回転子を
ユニットとして複数個用いられ、当該ユニットが軸方向
に所定個数を連結され、一体化されているものである。A permanent magnet type rotor of a permanent magnet type electric motor according to the next invention uses a plurality of the permanent magnet type rotors according to the above-mentioned invention as a unit, and a predetermined number of the units are connected in the axial direction to be integrated. Is what is being done.
【００３０】つぎの発明による永久磁石型電動機の永久
磁石型回転子は、さらに、前記ユニットが径方向に所定
の角度ずらして軸方向に所定個数を連結され、一体化さ
れているものである。In the permanent magnet rotor of the permanent magnet motor according to the next invention, a predetermined number of the units are connected in the axial direction by being shifted by a predetermined angle in the radial direction, and are integrated.
【００３１】つぎの発明による永久磁石型回転子は、さ
らに、内周面に複数個のスロット開口部を備え、集中巻
線を施された固定子鉄心の内側に回転可能に配設される
ものである。A permanent magnet type rotor according to the next invention further comprises a plurality of slot openings on the inner peripheral surface and is rotatably disposed inside a stator core provided with concentrated windings. It is.
【００３２】[0032]
【発明の実施の形態】以下に添付の図を参照して、この
発明にかかる永久磁石型回転子の実施の形態を詳細に説
明する。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a permanent magnet type rotor according to the present invention.
【００３３】実施の形態１．図１〜図３は、この発明に
よる永久磁石型回転子および永久磁石型電動機の実施の
形態１を示している。永久磁石型電動機は、固定子１０
と、永久磁石型回転子２０と、永久磁石型回転子２０を
支持するロータ軸４０と、軸受部材４１と、外側構造体
４２とで構成されている。Embodiment 1 1 to 3 show a first embodiment of a permanent magnet type rotor and a permanent magnet type electric motor according to the present invention. The permanent magnet type electric motor is
, A permanent magnet rotor 20, a rotor shaft 40 that supports the permanent magnet rotor 20, a bearing member 41, and an outer structure 42.
【００３４】固定子１０は、珪素鋼板を所定の形状、た
とえば図２に示されているように、内周面に１２個のス
ロット開口部１１を備えた形状に打ち抜いて積層した固
定子鉄心１２に三相巻線１３を施されており、リード線
１４により電源ユニットに接続されるように構成されて
いる。固定子鉄心１２のスロット開口部１１の個数と極
数は特性を考慮して適宜決定される。The stator 10 is formed by stamping and stacking a silicon steel sheet into a predetermined shape, for example, a shape having twelve slot openings 11 in the inner peripheral surface as shown in FIG. Are provided with a three-phase winding 13 and are connected to a power supply unit by a lead wire 14. The number and the number of poles of the slot openings 11 of the stator core 12 are appropriately determined in consideration of characteristics.
【００３５】永久磁石型回転子２０は、所定の形状に打
ち抜かれた珪素鋼板の積層体よりなる回転子鉄心２１
と、回転子鉄心２１に極数分、形成された磁石装着孔２
２に嵌め込み装着された極数分の永久磁石２３とで構成
される。The permanent magnet type rotor 20 has a rotor core 21 made of a laminate of silicon steel sheets punched into a predetermined shape.
And the magnet mounting holes 2 formed in the rotor core 21 for the number of poles.
2 and permanent magnets 23 for the number of poles fitted and mounted.
【００３６】図３は、８極の場合の永久磁石型回転子２
０を示している。回転子鉄心２１は８つの鉄心磁極部２
４を有しており、回転子鉄心２１の円周方向に、回転子
の極数８つ分、等間隔に設けた周方向を長辺とし径方向
を短辺とする軸方向に貫通する矩形の磁石装着孔２２を
８個形成され、この磁石装着孔２２のそれぞれに磁極面
を径方向とし互いに隣接する極が異なるように永久磁石
２３を装着されている。FIG. 3 shows a permanent magnet type rotor 2 having eight poles.
0 is shown. The rotor core 21 includes eight core magnetic poles 2
4, a rectangular shape penetrating in the axial direction with the long side being the circumferential direction and the short side being the radial direction provided at equal intervals in the circumferential direction of the rotor core 21 for eight rotor poles. The magnet mounting holes 22 are formed, and permanent magnets 23 are mounted in the respective magnet mounting holes 22 such that the pole faces are radial and the adjacent poles are different.
【００３７】永久磁石２３は鉄心磁極部２４に設けられ
た磁石装着孔２２に装着された状態で着磁される。この
ため、着磁時のパーミアンスが増加し、着磁が容易とな
り、また、有効磁束数を増加させることができる。さら
に、永久磁石２３を未着磁のまま磁石装着孔２２に装着
できるので、磁気吸引力の影響を受けずに装着でき、生
産性の向上に寄与することができる。The permanent magnet 23 is magnetized while being mounted in the magnet mounting hole 22 provided in the core magnetic pole part 24. For this reason, the permeance at the time of magnetization increases, magnetization becomes easy, and the number of effective magnetic fluxes can be increased. Further, since the permanent magnet 23 can be mounted in the magnet mounting hole 22 without being magnetized, the permanent magnet 23 can be mounted without being affected by the magnetic attractive force, which can contribute to an improvement in productivity.
【００３８】永久磁石２３は、ネオジウム系希土類磁石
にて構成されており、磁石装着孔２２にきっちり装着さ
れる大きさとなっている。ネオジウム系希土類磁石は、
残留磁束および保持力が共に大きく、磁気エネルギー積
がきわめて大きい。このため、磁石面積を小さくしても
必要なギャップ磁束数を確保でき、所要の出力を得るこ
とが可能となる。The permanent magnet 23 is made of a neodymium-based rare earth magnet, and has a size that can be securely mounted in the magnet mounting hole 22. Neodymium rare earth magnets are
Both the residual magnetic flux and the coercive force are large, and the magnetic energy product is extremely large. For this reason, the required number of gap magnetic fluxes can be secured even if the magnet area is reduced, and a required output can be obtained.
【００３９】永久磁石２３の外周側磁極面に形成される
鉄心磁極部２４の外周形状は、鉄心磁極部２４の周方向
中央部（点）Ｐａにて回転子鉄心２１の中心Ｃａよりの
径方向距離が最も大きくなり、鉄心磁極部２４の外周極
間部（点）Ｐｂにて鉄心中心Ｃａよりの径方向距離が最
も小さくなるような各鉄心磁極部２４毎の円弧状をなし
ている。換言すれば、回転子鉄心２１は極数と同じ弁数
の菊の紋章形をしている。The outer peripheral shape of the core magnetic pole portion 24 formed on the outer peripheral magnetic pole surface of the permanent magnet 23 is such that the outer peripheral shape of the core magnetic pole portion 24 in the circumferential direction center (point) Pa from the center Ca of the rotor iron core 21 in the radial direction Each core magnetic pole portion 24 has an arc shape such that the distance is the largest and the radial distance from the core center Ca is the smallest at the outer peripheral pole portion (point) Pb of the core magnetic pole portion 24. In other words, the rotor core 21 has the shape of a chrysanthemum with the same number of poles as the number of poles.
【００４０】鉄心中心Ｃａと鉄心磁極部２４の周方向中
央部Ｐａとの径方向距離をＲａ、鉄心磁極部２４の外周
円弧の中心をＣｂ、鉄心磁極部２４の外周円弧の半径を
Ｒｂとし、回転子の極数を８極とした場合、これらの値
は、特性的、構造的に許容できる範囲で適宜に決定され
てよいが、図４に示されているグラフから判るように、
鉄心中心Ｃａと鉄心磁極部２４の周方向中央部Ｐａと鉄
心磁極部２４の外周円弧の中心Ｃｂとが各鉄心磁極部２
４毎に同一線上にあり、｛（０．８・Ｒａ）／２｝＜Ｒ
ｂ＜｛（１．８・Ｒａ）／２｝の関係になるように形成
されることが好ましい。The radial distance between the iron core center Ca and the circumferential center Pa of the iron core magnetic pole part 24 is Ra, the center of the outer circumferential arc of the iron core magnetic pole part 24 is Cb, and the outer circumferential radius of the iron core magnetic pole part 24 is Rb. When the number of poles of the rotor is eight, these values may be appropriately determined within a range that is characteristically and structurally acceptable. As can be seen from the graph shown in FIG.
The core center Ca, the center Pa in the circumferential direction of the core magnetic pole part 24, and the center Cb of the outer circumferential arc of the core magnetic pole part 24 are the respective core magnetic pole parts 2.
4 are on the same line and {(0.8 · Ra) / 2} <R
It is preferable that b <{(1.8 · Ra) / 2}.
【００４１】上述のような構成によれば、固定子１０と
永久磁石型回転子２０との間の空隙距離が、永久磁石型
回転子２０の各鉄心磁極部２４毎に、鉄心磁極部２４の
周方向中央部Ｐａから極間部Ｐｂに向かうに従って徐々
に大きくなり、これに対応する部位の磁気抵抗もそれに
比例して大きくなる。According to the above-described configuration, the gap distance between the stator 10 and the permanent magnet type rotor 20 is different for each core magnetic pole portion 24 of the permanent magnet type rotor 20. The resistance gradually increases from the center Pa in the circumferential direction to the gap Pb, and the magnetic resistance of the corresponding portion also increases in proportion thereto.
【００４２】このため、鉄心磁極部２４毎の空隙の磁束
密度分布は、極間部Ｐｂに対応する部位においては小さ
く、周方向中央部Ｐａに対応する部位において集中し、
ガウス分布や正弦波に近い分布となる。これによりコギ
ングトルクが抑制され、回転動作時の振動や騒音が従来
のものに比して低減される。For this reason, the magnetic flux density distribution of the air gap for each iron core magnetic pole portion 24 is small at the portion corresponding to the gap Pb, concentrated at the portion corresponding to the circumferential central portion Pa,
It becomes a distribution close to a Gaussian distribution or a sine wave. As a result, cogging torque is suppressed, and vibration and noise during the rotation operation are reduced as compared with the conventional one.
【００４３】図５（ａ）は、この実施の形態のもので発
生するコギングトルクの波形を、図５（ｂ）は、従来の
もので発生する代表的なコギングトルクの波形を示して
いる。この図５（ａ）、（ｂ）より明らかなように、こ
の実施の形態のものにおいては従来ものにに比べてコギ
ングトルクを大幅に低減できることがわかる。FIG. 5A shows a waveform of a cogging torque generated in this embodiment, and FIG. 5B shows a typical waveform of a cogging torque generated in the conventional device. As is clear from FIGS. 5A and 5B, it is understood that the cogging torque of this embodiment can be greatly reduced as compared with the conventional one.
【００４４】なお、鉄心磁極部２４の外周円弧Ｒｂの値
が小さすぎると、誘起電圧が低下し充分なモータ出力が
得られない場合があり、これに対し、鉄心磁極部２４の
外周円弧Ｒｂの値が大きすぎると、コギングトルク低減
効果が得られず、振動や騒音が発生する。If the value of the outer circumferential arc Rb of the core magnetic pole portion 24 is too small, the induced voltage may decrease and a sufficient motor output may not be obtained. If the value is too large, the effect of reducing cogging torque cannot be obtained, and vibration and noise are generated.
【００４５】また、互いに隣接する永久磁石２３間の最
小寸法をＬａ、永久磁石２３の外周側磁極面と鉄心磁極
部２４の外周面との最小寸法をＬｂとした場合、これら
の値は、特には限定されないが、０．３ｍｍ＜Ｌａ＜
３．０ｍｍで、０．３ｍｍ＜Ｌｂ＜５．０ｍｍの関係に
なるように形成されていることが好ましい。When the minimum dimension between the adjacent permanent magnets 23 is La and the minimum dimension between the outer peripheral magnetic pole surface of the permanent magnet 23 and the outer peripheral surface of the iron core magnetic pole portion 24 is Lb, these values are particularly important. Is not limited, but 0.3 mm <La <
It is preferable that they are formed so as to be 3.0 mm and 0.3 mm <Lb <5.0 mm.
【００４６】Ｌａ、Ｌｂの値が小さすぎると、回転子２
０の回転強度が不足し、Ｌａ、Ｌｂの値が大きすぎる
と、永久磁石２３の漏れ磁束を抑制する効果が減少し、
この結果、誘起電圧が低下し、充分なモータ出力が得ら
れなくなる。If the values of La and Lb are too small, the rotor 2
If the rotational strength of 0 is insufficient and the values of La and Lb are too large, the effect of suppressing the leakage magnetic flux of the permanent magnet 23 decreases,
As a result, the induced voltage decreases, and a sufficient motor output cannot be obtained.
【００４７】なお、上述の実施の形態では、図２に示さ
れているように、内周面に１２個のスロット開口部１１
を備え、集中巻線を施された固定子鉄心１２の内側に配
設される８極の磁極を有した永久磁石式回転子２０にこ
の発明を適用したが、この発明による永久磁石式回転子
それに限らず、分布巻線を有する永久磁石式回転子にも
有効である。In the above embodiment, as shown in FIG. 2, twelve slot openings 11 are formed on the inner peripheral surface.
The present invention is applied to the permanent magnet rotor 20 having eight magnetic poles disposed inside the stator core 12 provided with the concentrated winding, but the permanent magnet rotor according to the present invention is provided. The present invention is not limited to this, and is also effective for a permanent magnet type rotor having a distributed winding.
【００４８】実施の形態２．図６は、この発明による永
久磁石型回転子の実施の形態２を示している。なお、図
６において、図３に対応する部分は、図３に付した符号
と同一の符号を付けて、その説明を省略する。Embodiment 2 FIG. 6 shows a second embodiment of the permanent magnet type rotor according to the present invention. In FIG. 6, portions corresponding to those in FIG. 3 are denoted by the same reference numerals as those in FIG. 3, and description thereof will be omitted.
【００４９】実施の形態２では、上述の実施の形態１の
構成に加えて、隣接する鉄心磁極部外周の極間部分２５
が半径Ｒｃによる小半径の円弧で連結されている。ま
た、磁石装着孔２２の外周側両端角部２６が半径Ｒｄに
よるアール形状とされている。極間部分２５の接続円弧
の半径Ｒｃの値は、特に限定されず、回転子２２の外形
寸法、鉄心磁極部２４の外周面円弧径Ｒｂ等により適宜
決定されるが、半径Ｒｃの値が大きすぎると、コギング
トルク低減効果が減少するため、Ｒｃ＜（Ｒｂ／２）の
値に設定されることが好ましい。In the second embodiment, in addition to the structure of the first embodiment, the inter-pole portion 25 on the outer periphery of the adjacent core magnetic pole portion is provided.
Are connected by a small radius arc formed by the radius Rc. Further, both outer corners 26 of the magnet mounting hole 22 are formed in a round shape with a radius Rd. The value of the radius Rc of the connecting arc of the inter-pole portion 25 is not particularly limited, and is determined as appropriate depending on the outer dimensions of the rotor 22, the outer peripheral surface arc diameter Rb of the core magnetic pole portion 24, and the like. If it is too large, the cogging torque reduction effect decreases, so that it is preferable to set Rc <(Rb / 2).
【００５０】また、磁石装着孔２２の外周側両端角部２
６のアール半径Ｒｄは、回転強度を確保しながら永久磁
石２３の漏れ磁束を抑制するために、磁石装着孔２２の
径方向の長さをＬｃとした場合、Ｒｄ＜Ｌｃの関係にな
るように形成されていることが好ましい。The outer peripheral corners 2 of the magnet mounting hole 22
The radius Rd of No. 6 is such that the relationship Rd <Lc is satisfied when the radial length of the magnet mounting hole 22 is Lc in order to suppress the leakage magnetic flux of the permanent magnet 23 while securing the rotational strength. Preferably, it is formed.
【００５１】実施の形態３．図７、図８は、この発明に
よる永久磁石型回転子の実施の形態３を示している。な
お、図７、図８において、図２、図３に対応する部分
は、図２、図３に付した符号と同一の符号を付けて、そ
の説明を省略する。Embodiment 3 FIG. 7 and 8 show a third embodiment of the permanent magnet type rotor according to the present invention. In FIGS. 7 and 8, portions corresponding to FIGS. 2 and 3 are denoted by the same reference numerals as those in FIGS. 2 and 3, and the description thereof is omitted.
【００５２】この実施の形態は、４極の場合の永久磁石
型回転子２０を示している。回転子鉄心２１は４つの鉄
心磁極部２４を有しており、回転子鉄心２１の円周方向
に、回転子の極数４つ分等間隔に設けた周方向を長辺と
し径方向を短辺とする軸方向に貫通する矩形の磁石装着
孔２２を４個形成され、この磁石装着孔２２のそれぞれ
に磁極面を径方向とし互いに隣接する極が異なるように
永久磁石２３を装着されている。This embodiment shows a permanent magnet type rotor 20 having four poles. The rotor core 21 has four core magnetic pole portions 24, and the circumferential direction provided at equal intervals by the number of poles of the rotor in the circumferential direction of the rotor core 21 is set to be a long side and a radial direction is short. Four rectangular magnet mounting holes 22 penetrating in the axial direction as sides are formed, and permanent magnets 23 are mounted in each of the magnet mounting holes 22 such that the magnetic pole surface is in the radial direction and adjacent poles are different. .
【００５３】この実施の形態でも、永久磁石２３は、鉄
心磁極部２４に設けられた磁石装着孔２２に装着された
状態で着磁される。このため、着磁時のパーミアンスが
増加し、着磁が容易となり、また、有効磁束数を増加さ
せることができる。さらに、永久磁石２３を未着磁のま
ま磁石装着孔２２に装着できるので、磁気吸引力の影響
を受けずに装着でき、生産性の向上に寄与することがで
きる。Also in this embodiment, the permanent magnet 23 is magnetized in a state where it is mounted in the magnet mounting hole 22 provided in the iron core magnetic pole part 24. For this reason, the permeance at the time of magnetization increases, magnetization becomes easy, and the number of effective magnetic fluxes can be increased. Further, since the permanent magnet 23 can be mounted in the magnet mounting hole 22 without being magnetized, the permanent magnet 23 can be mounted without being affected by the magnetic attractive force, which can contribute to an improvement in productivity.
【００５４】永久磁石２３の外周側磁極面に形成される
鉄心磁極部２４の外周形状は、鉄心磁極部２４の周方向
中央部（点）Ｐａにて回転子鉄心２１の中心Ｃａよりの
径方向距離が最も大きくなり、鉄心磁極部２４の外周極
間部（点）Ｐｂにて鉄心中心Ｃａよりの径方向距離が最
も小さくなるような各鉄心磁極部２４毎の円弧状をなし
ている。換言すれば、回転子鉄心２１は極数と同じ弁数
の花形をしている。The outer peripheral shape of the core magnetic pole portion 24 formed on the outer peripheral magnetic pole surface of the permanent magnet 23 is such that the outer peripheral shape of the core magnetic pole portion 24 at the circumferential central portion (point) Pa from the center Ca of the rotor iron core 21 in the radial direction Each core magnetic pole portion 24 has an arc shape such that the distance is the largest and the radial distance from the core center Ca is the smallest at the outer peripheral pole portion (point) Pb of the core magnetic pole portion 24. In other words, the rotor core 21 has a flower shape with the same number of poles as the number of poles.
【００５５】この場合も、鉄心中心Ｃａと鉄心磁極部２
４の周方向中央部Ｐａとの径方向距離をＲａ、鉄心磁極
部２４の外周円弧の中心をＣｂ、鉄心磁極部２４の外周
円弧の半径をＲｂ、鉄心中心Ｃａと極間部Ｐｂとの径方
向距離をＲｐとした場合、これらの値は、特性的・構造
的に許容できる範囲で適宜決定されてよいが、図９に示
されているように、（Ｒａ−Ｒｐ）の値が大きすぎる
と、誘起電圧が低下し、充分なモータ出力が得られなく
なり、これとは反対に（Ｒａ−Ｒｐ）の値が小さすぎる
と、コギングトルク低減効果が得られず、振動や騒音が
発生するから、鉄心中心Ｃａと鉄心磁極部２４の周方向
中央部Ｐａと鉄心磁極部２４の外周円弧の中心Ｃｂとは
各鉄心磁極部２４毎に同一線上にあり、Ｒａ＞Ｒｂで且
つ０．５ｍｍ＜（Ｒａ−Ｒｐ）＜５ｍｍの関係になるよ
う形成されることが好ましい。Also in this case, the iron core center Ca and the iron core
4, the radial distance from the circumferential central portion Pa is Ra, the center of the outer circumferential arc of the core magnetic pole portion 24 is Cb, the radius of the outer circumferential arc of the core magnetic pole portion 24 is Rb, and the diameter between the iron core center Ca and the pole portion Pb. When the directional distance is Rp, these values may be determined as appropriate within a range that is characteristically and structurally acceptable, but as shown in FIG. 9, the value of (Ra−Rp) is too large. When the value of (Ra-Rp) is too small, the effect of reducing the cogging torque cannot be obtained, and vibration and noise are generated. The center Ca of the core, the center Pa in the circumferential direction of the core magnetic pole part 24, and the center Cb of the outer peripheral arc of the core magnetic pole part 24 are on the same line for each core magnetic pole part 24, and Ra> Rb and 0.5 mm <( Ra−Rp) <5 mm Masui.
【００５６】上述のような構成では、固定子１０と永久
磁石型回転子２０との間の空隙距離が、永久磁石型回転
子２０の各鉄心磁極部２４毎に、鉄心磁極部２４の周方
向中央部Ｐａから極間部Ｐｂに向かうに従って徐々に大
きくなり、これに対応する部位の磁気抵抗もそれに比例
して大きくなる。In the above-described configuration, the air gap distance between the stator 10 and the permanent magnet type rotor 20 is different for each core magnetic pole portion 24 of the permanent magnet type rotor 20 in the circumferential direction of the core magnetic pole portion 24. The resistance gradually increases from the center Pa toward the gap Pb, and the magnetic resistance of the corresponding portion also increases in proportion thereto.
【００５７】このため、鉄心磁極部２４毎の空隙の磁束
密度分布は、極間部Ｐｂに対応する部位においては小さ
く、周方向中央部Ｐａに対応する部位において集中し、
ガウス分布や正弦波に近い分布となる。これによりコギ
ングトルクが抑制され、回転動作時の振動や騒音が従来
のものに比して低減する。For this reason, the magnetic flux density distribution of the air gap for each iron core magnetic pole portion 24 is small at the portion corresponding to the gap portion Pb, and concentrated at the portion corresponding to the circumferential central portion Pa.
It becomes a distribution close to a Gaussian distribution or a sine wave. Thereby, the cogging torque is suppressed, and vibration and noise during the rotation operation are reduced as compared with the conventional one.
【００５８】また、この実施の形態でも、互いに隣接す
る永久磁石２３（磁石装着孔２２）の間の最小寸法をＬ
ａ、磁石装着孔２２と鉄心磁極部２４の外周面との最小
寸法をＬｂとした場合、これらの値は特に限定されない
が、０．３ｍｍ＜Ｌａ＜３．０ｍｍで、０．３ｍｍ＜Ｌ
ｂ＜５．０ｍｍの関係になるように形成されていること
が好ましく、Ｌａ、Ｌｂの値が小さすぎると、回転子２
０の回転強度が不足し、これとは反対に、Ｌａ、Ｌｂの
値が大きすぎると、永久磁石２３の漏れ磁束を抑制する
効果が減少し、この結果、誘起電圧が低下し、充分なモ
ータ出力が得られなくなる。Also in this embodiment, the minimum dimension between the permanent magnets 23 (magnet mounting holes 22) adjacent to each other is L.
a, when the minimum dimension between the magnet mounting hole 22 and the outer peripheral surface of the iron core magnetic pole part 24 is Lb, these values are not particularly limited, but 0.3 mm <La <3.0 mm and 0.3 mm <L
It is preferable that b <5.0 mm be satisfied. If the values of La and Lb are too small, the rotor 2
In contrast, if the rotational strength of La is not sufficient and the values of La and Lb are too large, the effect of suppressing the leakage magnetic flux of the permanent magnet 23 is reduced, and as a result, the induced voltage is reduced and a sufficient motor No output can be obtained.
【００５９】回転子鉄心２１は同一形状の珪素鋼板の積
層体により構成されており、鉄心磁極部２４の外周極間
部Ｐｂをレーザ溶接等により軸方向に溶接され、一体化
（ブロック化）されている。永久磁石型回転子２０の回
転子鉄心２１は、通常、所定の形状に打ち抜かれた珪素
鋼板をかしめ等により固着して形成されるが、さらに、
鉄心磁極部２４の外周極間部Ｐｂがレーザ溶接等により
軸方向に溶接され、積層された珪素鋼板が相互に固着さ
れることにより、高速回転に対しても充分な回転強度を
確保することができる。The rotor core 21 is formed of a laminated body of silicon steel plates having the same shape, and the outer peripheral portion Pb of the core magnetic pole portion 24 is axially welded by laser welding or the like to be integrated (blocked). ing. The rotor core 21 of the permanent magnet type rotor 20 is usually formed by fixing a silicon steel plate punched into a predetermined shape by caulking or the like.
The peripheral pole portion Pb of the core magnetic pole portion 24 is axially welded by laser welding or the like, and the laminated silicon steel sheets are fixed to each other, so that sufficient rotational strength can be ensured even at high speed rotation. it can.
【００６０】なお、かしめとレーザ溶接を併用せず、レ
ーザ溶接単独にても安価で容易に、高速回転に対しても
充分な回転強度を有する回転子鉄心２１を形成すること
ができる。また、４極ロータの場合には、４個所の外周
極間部Ｐｂの全て溶接を行うか、２個所にするか等は、
所定の特性に合わせて選択することができる。It should be noted that the rotor core 21 having sufficient rotational strength for high-speed rotation can be formed easily and inexpensively by laser welding alone without using caulking and laser welding together. Further, in the case of a four-pole rotor, whether to weld all of the four peripheral inter-pole portions Pb or to make two portions is determined as follows.
It can be selected according to predetermined characteristics.
【００６１】実施の形態４．図１０は、この発明による
永久磁石型回転子の実施の形態４を示している。実施の
形態４では、上述の実施の形態３の構成に加えて、互い
に隣接する磁石装着孔２２の間に、磁束短絡防止用の開
口５０が軸方向に貫通して形成されている。Embodiment 4 FIG. 10 shows a fourth embodiment of the permanent magnet type rotor according to the present invention. In the fourth embodiment, in addition to the configuration of the above-described third embodiment, an opening 50 for preventing a magnetic flux short circuit is formed between the adjacent magnet mounting holes 22 in the axial direction.
【００６２】磁束短絡防止用の開口５０と磁石装着孔２
２との間の最小寸法をＬｄ、磁束短絡防止用の開口５０
と鉄心極間部２４の外周面との間の最小寸法をＬｅとし
た場合、これらの値は特に限定されないが、ＬｄとＬｅ
がほぼ等しく、０．３ｍｍ＜（ＬｄおよびＬｅ）＜３ｍ
ｍの関係になるように形成されていることが好ましい。An opening 50 for preventing a magnetic flux short circuit and a magnet mounting hole 2
Ld is the minimum dimension between the two and the opening 50 for preventing magnetic flux short circuit.
When the minimum dimension between the core and the outer peripheral surface of the core gap portion 24 is Le, these values are not particularly limited, but Ld and Le
Are approximately equal, and 0.3 mm <(Ld and Le) <3 m
Preferably, they are formed so as to have a relationship of m.
【００６３】磁束短絡防止用の開口５０により、永久磁
石２３の漏れ磁束を効果的に抑制することができるが、
Ｌｄ、Ｌｅの値が小さすぎると、回転子２０の回転強度
が不足し、これとは反対に、Ｌｄ、Ｌｅの値が大きすぎ
ると、永久磁石２３の漏れ磁束を抑制する効果が減少
し、この結果、誘起電圧が低下し、充分なモータ出力が
得られなくなる。The magnetic flux leakage of the permanent magnet 23 can be effectively suppressed by the opening 50 for preventing the magnetic flux short circuit.
If the values of Ld and Le are too small, the rotational strength of the rotor 20 will be insufficient. Conversely, if the values of Ld and Le are too large, the effect of suppressing the leakage magnetic flux of the permanent magnet 23 will decrease, As a result, the induced voltage decreases, and a sufficient motor output cannot be obtained.
【００６４】なお、磁束短絡防止用の開口５０の形成
は、実施の形態１、２に示されているような８極用のロ
ータにも同様に適用できる。The formation of the opening 50 for preventing magnetic flux short-circuit can be similarly applied to the eight-pole rotor shown in the first and second embodiments.
【００６５】実施の形態５．図１１は、この発明による
永久磁石型回転子の実施の形態５を示している。実施の
形態５では、上述の実施の形態４の構成に加えて、磁石
装着孔２２の外周側両端角部２６が半径Ｒｄによるアー
ル形状とされている。Embodiment 5 FIG. 11 shows a fifth embodiment of the permanent magnet type rotor according to the present invention. In the fifth embodiment, in addition to the configuration of the above-described fourth embodiment, both end corners 26 on the outer peripheral side of the magnet mounting hole 22 are formed in a round shape with a radius Rd.
【００６６】磁石装着孔２２の外周側両端角部２６のア
ール半径Ｒｄは、回転強度を確保しながら永久磁石２３
の漏れ磁束を抑制するために、磁石装着孔２２の径方向
の長さをＬｃとした場合、Ｒｄ＜Ｌｃの関係になるよう
に形成されていることが好ましい。The radius Rd of the corners 26 at both ends on the outer peripheral side of the magnet mounting hole 22 is set so that the permanent magnet 23
In order to suppress the leakage magnetic flux, when the length of the magnet mounting hole 22 in the radial direction is Lc, it is preferable that the magnet mounting hole 22 be formed so as to satisfy the relationship of Rd <Lc.
【００６７】実施の形態６．図１２、図１３は、この発
明による永久磁石型回転子の実施の形態６を示してい
る。この実施の形態では、上述の実施の形態１あるいは
２の構成に加えて、永久磁石２３の配置部より内側領域
の回転子鉄心２１に、軸方向に貫通する小径の貫通孔２
７が各永久磁石２３毎に形成されている。Embodiment 6 FIG. 12 and 13 show a sixth embodiment of the permanent magnet rotor according to the present invention. In this embodiment, in addition to the configuration of the above-described first or second embodiment, a small-diameter through-hole
7 is formed for each permanent magnet 23.
【００６８】貫通孔２７を下錐孔として用い、端部に錐
孔加工２８を施すことにより、減量法によって永久磁石
型回転子２０の回転バランス取りを行うことができる。
錐孔は永久磁石２３の特性に与える影響を最小限とする
位置と径を選択され、回転バランス取りは、永久磁石型
回転子２０の軸方向両端面にて夫々複数個の貫通孔２７
を用いて行うことができる。貫通孔２７は、回転子鉄心
２１を所定の形状に打ち抜く時に同時に打ち抜くことが
でき、安価で容易に形成することができる。上述のよう
な貫通孔２７に錐孔加工２８を施すことによる永久磁石
型回転子２０の回転バランス取りは、図１４に示されて
いるように、４極ロータにも同様に適用できる。By using the through hole 27 as a lower conical hole and performing a conical hole processing 28 at the end, the rotation of the permanent magnet type rotor 20 can be balanced by the weight reduction method.
The positions and diameters of the conical holes are selected so as to minimize the influence on the characteristics of the permanent magnet 23, and rotation balancing is performed by using a plurality of through holes 27 at both axial end surfaces of the permanent magnet type rotor 20.
Can be performed. The through-hole 27 can be punched out simultaneously when the rotor core 21 is punched into a predetermined shape, and can be easily formed at low cost. The rotation balancing of the permanent magnet type rotor 20 by performing the drilling 28 on the through hole 27 as described above can be similarly applied to a four-pole rotor as shown in FIG.
【００６９】実施の形態７．図１５、図１６は、この発
明による永久磁石型回転子の実施の形態７を示してい
る。この実施の形態では、上述の実施の形態１あるいは
２の構成に加えて、永久磁石２３の配置部より内側領域
の回転子鉄心２１に、比較的大径、たとえば直径５〜２
０ｍｍ程度の貫通孔２９が各永久磁石２３毎に形成され
ている。Embodiment 7 15 and 16 show a seventh embodiment of the permanent magnet rotor according to the present invention. In this embodiment, in addition to the structure of the above-described first or second embodiment, a relatively large diameter, for example, a diameter of 5 to 2
A through hole 29 of about 0 mm is formed for each permanent magnet 23.
【００７０】貫通孔２９に粘着性パテ等の充填材３０を
充填することにより、増量法によって永久磁石型回転子
２０の回転バランス取りを行うことを行うことができ
る。貫通孔２９には永久磁石２３の特性に与える影響を
最小限とする位置と径を選択され、回転バランス取り
は、永久磁石型回転子２０の軸方向両端面にて夫々複数
個の貫通孔２９を用いて行うことができる。By filling the through-hole 29 with the filler 30 such as an adhesive putty, the rotation of the permanent magnet type rotor 20 can be balanced by an increasing method. The positions and diameters of the through holes 29 are selected so as to minimize the influence on the characteristics of the permanent magnet 23. Rotation balancing is performed by using a plurality of through holes 29 at both axial end surfaces of the permanent magnet type rotor 20. Can be performed.
【００７１】なお、貫通孔２９も、回転子鉄心２１を所
定の形状に打ち抜く時に同時に打ち抜くことができ、安
価で容易に形成することができる。The through-hole 29 can also be punched out simultaneously when the rotor core 21 is punched into a predetermined shape, and can be easily formed at low cost.
【００７２】貫通孔２９に粘着性パテ等の充填材３０を
充填することによる永久磁石型回転子２０の回転バラン
ス取りは、図１７に示されているように、４極ロータに
も同様に適用できる。The rotation balancing of the permanent magnet type rotor 20 by filling the through hole 29 with the filler 30 such as an adhesive putty is similarly applied to a four-pole rotor as shown in FIG. it can.
【００７３】実施の形態８．図１８は、この発明による
永久磁石型回転子の実施の形態８を示している。この実
施の形態では、上述のような実施の形態の構成に加え
て、磁石装着孔２２の周方向長さが永久磁石２３の周方
向長さより大きく、永久磁石２３を磁石装着孔２２の周
方向のほぼ中央に固定する手段として突起部３１を有し
ている。永久磁石２３は磁石装着孔２２内において両側
を突起部３１に挟まれて固定される。これにより、永久
磁石２３の漏れ磁束が抑制され、しかも永久磁石２３の
固定、装着が容易に行われ得るようになる。Embodiment 8 FIG. FIG. 18 shows an eighth embodiment of the permanent magnet type rotor according to the present invention. In this embodiment, in addition to the configuration of the above-described embodiment, the circumferential length of the magnet mounting hole 22 is larger than the circumferential length of the permanent magnet 23, and the permanent magnet 23 is moved in the circumferential direction of the magnet mounting hole 22. Has a protruding portion 31 as a means for fixing it substantially at the center. The permanent magnet 23 is fixed with both sides sandwiched between the projections 31 in the magnet mounting hole 22. Thereby, the leakage magnetic flux of the permanent magnet 23 is suppressed, and the permanent magnet 23 can be easily fixed and mounted.
【００７４】永久磁石２３の回転子鉄心２１に対する固
着は、磁石装着孔２２に永久磁石２３が嵌め込まれた後
に、磁石装着孔２２の両側にできる空隙５１にエポキシ
系接着剤等を注入することにより、接着剤で確実に行う
ことができる。これにより、安価で、容易に永久磁石２
３を回転子鉄心２１に固着することができる。The permanent magnet 23 is fixed to the rotor core 21 by injecting an epoxy adhesive or the like into a gap 51 formed on both sides of the magnet mounting hole 22 after the permanent magnet 23 is fitted into the magnet mounting hole 22. Can be reliably performed with an adhesive. Thereby, the permanent magnet 2 can be easily manufactured at low cost.
3 can be fixed to the rotor core 21.
【００７５】実施の形態９．図１９は、この発明による
永久磁石型回転子の実施の形態９を示している。この実
施の形態では、上述のような実施の形態の構成に加え
て、磁石装着孔２２の周方向長さが永久磁石２３の周方
向長さより大きく、永久磁石２３を磁石装着孔２２の周
方向のほぼ中央に固定する手段として段差部３２を有し
ている。永久磁石２３は磁石装着孔２２内において両側
を段差部３２の段差壁に挟まれて固定される。これによ
り、この実施の形態でも、永久磁石２３の漏れ磁束が抑
制され、しかも永久磁石２３の固定、装着が容易に行わ
れ得るようになる。これにより、安価で、容易に永久磁
石２３を回転子鉄心２１に固着することができる。Embodiment 9 FIG. FIG. 19 shows a ninth embodiment of the permanent magnet rotor according to the present invention. In this embodiment, in addition to the configuration of the above-described embodiment, the circumferential length of the magnet mounting hole 22 is larger than the circumferential length of the permanent magnet 23, and the permanent magnet 23 is moved in the circumferential direction of the magnet mounting hole 22. Has a step 32 as a means for fixing it to substantially the center of the. The permanent magnet 23 is fixed with both sides sandwiched between the step walls of the step part 32 in the magnet mounting hole 22. Accordingly, also in this embodiment, the leakage magnetic flux of the permanent magnet 23 is suppressed, and the permanent magnet 23 can be easily fixed and mounted. Thereby, the permanent magnet 23 can be easily fixed to the rotor core 21 at low cost.
【００７６】この場合も、永久磁石２３の回転子鉄心２
１に対する固着は、磁石装着孔２２に永久磁石２３が嵌
め込まれた後に、磁石装着孔２２の両側にできる空隙５
１にエポキシ系接着剤等を注入することにより、接着剤
で確実に行うことができる。Also in this case, the rotor core 2 of the permanent magnet 23
After the permanent magnet 23 is fitted into the magnet mounting hole 22, the gap 5 formed on both sides of the magnet mounting hole 22 is fixed to the magnet mounting hole 22.
By injecting an epoxy-based adhesive or the like into 1, it is possible to reliably perform the operation with the adhesive.
【００７７】上述のような永久磁石２３の固定、固着
は、図２０、図２１に示されているように、４極ロータ
にも同様に適用できる。The fixing and fixing of the permanent magnet 23 as described above can be similarly applied to a four-pole rotor as shown in FIGS.
【００７８】実施の形態１０．図２２は、この発明によ
る永久磁石型回転子の実施の形態１０を示している。こ
の実施の形態では、磁石装着孔２２に沿って少なくとも
１ヶ所に拡張形成された凹部分５２が形成されており、
磁石装着孔２２に永久磁石２３が嵌め込まれた後に、凹
部分５２にエポキシ系接着剤等が注入されることによ
り、永久磁石２３の回転子鉄心２１に対する固着が行わ
れている。従って、この場合も、安価で、容易に永久磁
石２３を回転子鉄心２１に固着することができる。Embodiment 10 FIG. FIG. 22 shows a tenth embodiment of a permanent magnet type rotor according to the present invention. In this embodiment, a concave portion 52 is formed at least in one place along the magnet mounting hole 22, and is formed as a concave portion.
After the permanent magnet 23 is fitted into the magnet mounting hole 22, an epoxy-based adhesive or the like is injected into the concave portion 52, whereby the permanent magnet 23 is fixed to the rotor core 21. Therefore, also in this case, the permanent magnet 23 can be easily fixed to the rotor core 21 at low cost.
【００７９】実施の形態１１．図２３は、この発明によ
る永久磁石型回転子の実施の形態１１を示している。こ
の実施の形態では、上述のような構成による永久磁石型
回転子２０がユニットとして複数個（所定個数）、ロー
タ軸（図中省略）の軸方向に積層連結され、全体を一体
化されて全体として一つの永久磁石型回転子として形成
されている（永久磁石２３は図示省略）。上述のよう
に、ユニット化を行なうことにより、大容量機の永久磁
石型回転子を小形・標準化されたユニットの組み合せで
製作することができ、生産性向上とコストダウンに寄与
することができる。Embodiment 11 FIG. FIG. 23 shows an eleventh embodiment of the permanent magnet rotor according to the present invention. In this embodiment, a plurality (predetermined number) of the permanent magnet type rotors 20 having the above-described configuration are stacked and connected in the axial direction of a rotor shaft (omitted in the drawing) as a unit, and the whole is integrated into a whole. As one permanent magnet type rotor (the permanent magnet 23 is not shown). As described above, by performing the unitization, a permanent magnet type rotor of a large capacity machine can be manufactured by a combination of a small and standardized unit, which can contribute to improvement in productivity and cost reduction.
【００８０】実施の形態１２．図２４は、この発明によ
る永久磁石型回転子の実施の形態１２を示している。こ
の実施の形態１０では、上述のような構成による永久磁
石型回転子２０のユニットとして複数個（所定個数）、
ロータ軸（図中省略）の径方向に所定の角度でずらしな
がら軸方向に積層連結され、全体を一体化されて全体と
して一つの永久磁石型回転子として形成されている（永
久磁石２３は図示省略）。Embodiment 12 FIG. FIG. 24 shows a twelfth embodiment of the permanent magnet rotor according to the present invention. In the tenth embodiment, a plurality (predetermined number) of units of the permanent magnet type rotor 20 having the above-described configuration are provided.
The rotor shaft (omitted in the figure) is axially stacked and connected while being shifted at a predetermined angle in the radial direction of the rotor shaft, and is integrally formed as a whole as one permanent magnet type rotor (the permanent magnet 23 is shown in the figure). Omitted).
【００８１】各ユニットを所定の角度でずらしながらロ
ータ軸に取り付けることにより、スキュー効果により、
コギングトルクを更に低減させることができ、振動・騒
音ひいては回転ムラを小さくすることができる。By mounting each unit on the rotor shaft while shifting it at a predetermined angle, the skew effect
The cogging torque can be further reduced, and vibration / noise and, consequently, rotation unevenness can be reduced.
【００８２】なお、上述の実施の形態１１、１２では、
永久磁石型回転子２０のユニットを３個用いているが、
この発明による永久磁石型回転子は、それに限らず、所
定の特性を得るための最適なユニットの個数に対しても
有効である。また、上述の実施の形態では、回転子の極
数が８極あるいは４極の場合について説明したが、この
発明による永久磁石型回転子はこれ以外の極数を有する
回転子に対しても有効である。In the eleventh and twelfth embodiments,
Although three units of the permanent magnet type rotor 20 are used,
The permanent magnet type rotor according to the present invention is not limited to this, and is also effective for the optimum number of units for obtaining predetermined characteristics. In the above-described embodiment, the case where the number of poles of the rotor is eight or four is described. However, the permanent magnet type rotor according to the present invention is effective for rotors having other numbers of poles. It is.
【００８３】[0083]
【発明の効果】以上の説明から理解される如く、この発
明による永久磁石型電動機の永久磁石型回転子によれ
ば、鉄心磁極部の形状効果により、各磁極毎の空隙の磁
束密度分布がガウス分布や正弦波に近い分布となり、こ
の結果、コギングトルクを低減させることができ、ひい
ては、振動や騒音、回転むらを小さくすることができ
る。As will be understood from the above description, according to the permanent magnet type rotor of the permanent magnet type electric motor according to the present invention, the magnetic flux density distribution of the air gap for each magnetic pole is Gaussian due to the shape effect of the core magnetic pole portion. A distribution or a distribution close to a sine wave is obtained. As a result, cogging torque can be reduced, and vibration, noise, and uneven rotation can be reduced.
【００８４】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、鉄心中心と鉄心磁極部の周方向
中央部との径方向距離と極間部との径方向距離の適正設
定により、各磁極毎の空隙の磁束密度分布がガウス分布
や正弦波に近い分布となり、この結果、コギングトルク
を低減させることができ、ひいては、振動や騒音、回転
むらを小さくすることができる。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, the radial distance between the center of the iron core and the center in the circumferential direction of the magnetic pole of the iron core and the radial distance between the poles can be appropriately set. In addition, the magnetic flux density distribution of the air gap for each magnetic pole becomes a distribution close to a Gaussian distribution or a sine wave. As a result, cogging torque can be reduced, and vibration, noise, and uneven rotation can be reduced.
【００８５】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、鉄心中心と鉄心磁極部の周方向
中央部との径方向距離と、鉄心磁極部の外周円弧の半径
の適正設定により、各磁極毎の空隙の磁束密度分布がガ
ウス分布や正弦波に近い分布となり、この結果、コギン
グトルクを低減させることができ、ひいては、振動や騒
音、回転むらを小さくすることができる。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, the radial distance between the center of the iron core and the center in the circumferential direction of the iron core magnetic pole portion, and the appropriate setting of the radius of the outer circumferential arc of the iron core magnetic pole portion. As a result, the magnetic flux density distribution of the air gap for each magnetic pole becomes a distribution close to a Gaussian distribution or a sine wave. As a result, cogging torque can be reduced, and vibration, noise, and uneven rotation can be reduced.
【００８６】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、互いに隣接する永久磁石間の最
小寸法と、永久磁石の外周側磁極面と鉄心磁極部の外周
面との最小寸法の適正設定により、回転強度を確保しつ
つ漏れ磁束を抑制でき、モータの出力を向上することが
できる。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, the minimum size between the permanent magnets adjacent to each other and the minimum size between the outer peripheral surface of the permanent magnet and the outer peripheral surface of the core magnetic pole portion. With the appropriate setting, it is possible to suppress the leakage magnetic flux while securing the rotational strength, and to improve the output of the motor.
【００８７】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、隣接する鉄心磁極部外周の極間
部分が小半径の円弧で連結されているから、コギングト
ルクが、より一層、有効的に低減する。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, the cogging torque can be further reduced because the inter-pole portions on the outer periphery of the adjacent core magnetic pole portions are connected by a small-radius arc. Effectively reduce.
【００８８】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、隣接する鉄心磁極部外周の極間
部分の円弧半径が適正設定され、しかも、磁石装着孔の
外周側両端角部がアール形状とされ、このアール形状の
半径も適正設定されているから、コギングトルクを、よ
り一層、有効的に低減すると共に、回転子の回転強度を
確保することができる。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, the arc radius of the inter-pole portion of the outer periphery of the adjacent magnetic pole portion of the iron core is set appropriately, and the corners at both ends on the outer peripheral side of the magnet mounting hole are set. Are rounded, and the radius of the rounded shape is appropriately set, so that the cogging torque can be further effectively reduced and the rotational strength of the rotor can be secured.
【００８９】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、磁石装着孔の外周側両端角部が
アール形状とされ、このアール形状の半径も適正設定さ
れているから、漏れ磁束を、より一層、有効的に低減す
ると共に、回転子の回転強度を確保することができる。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, the corners at both ends on the outer peripheral side of the magnet mounting hole are formed in a round shape, and the radius of the round shape is appropriately set. The magnetic flux can be further effectively reduced, and the rotational strength of the rotor can be secured.
【００９０】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、互いに隣接する永久磁石間に磁
束短絡防止用の開口を設けることにより、回転強度を確
保しつつ漏れ磁束を抑制することができる。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, an opening for preventing a magnetic flux short circuit is provided between the permanent magnets adjacent to each other, thereby suppressing the leakage magnetic flux while securing the rotational strength. be able to.
【００９１】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、永久磁石と磁束短絡防止用開口
間の最小寸法と、磁束短絡防止用開口と鉄心磁極部の外
周面との最小寸法の適正設定により、回転強度を確保し
つつ漏れ磁束を抑制でき、モータの出力を向上すること
ができる。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, the minimum dimension between the permanent magnet and the magnetic flux short-circuit preventing opening and the minimum distance between the magnetic flux short-circuit preventing opening and the outer peripheral surface of the iron core magnetic pole portion. By appropriately setting the dimensions, it is possible to suppress the leakage magnetic flux while securing the rotational strength, and to improve the output of the motor.
【００９２】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、回転子鉄心の鉄心磁極部の外周
の極間部をレーザ溶接等により軸方向に固着することに
より、積層された珪素鋼板を更に強固に固着することが
でき、高速回転に対しても充分な回転強度を得ることが
できる。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, the pole portions of the outer periphery of the core magnetic pole portion of the rotor core are fixed in the axial direction by laser welding or the like, so that the lamination is performed. The silicon steel sheet can be further firmly fixed, and sufficient rotational strength can be obtained even at high speed rotation.
【００９３】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、永久磁石の配置部より内側領域
の回転子鉄心に軸方向に貫通形成された貫通孔を下錐孔
として減量法により回転子の回転バランス取りを行うこ
とができ、貫通孔は回転子鉄心を所定の形状に打ち抜く
時に同時に打ち抜くことができるから、減量法によりバ
ランス取りを安価に行うことができる。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, the through hole formed in the rotor core in the area inside the permanent magnet arrangement portion in the axial direction is defined as the lower conical hole by the weight reduction method. Thus, the rotation balance of the rotor can be performed, and the through-hole can be punched out at the same time as the rotor core is punched into a predetermined shape.
【００９４】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、永久磁石の配置部より内側領域
の回転子鉄心に軸方向に貫通形成された貫通孔にに充填
材を充填する増量法により回転子の回転バランス取りを
行うことができ、貫通孔は回転子鉄心を所定の形状に打
ち抜く時に同時に打ち抜くことができるから、増量法に
よりバランス取りを安価に行うことができる。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, the filler is filled in the through-hole formed in the rotor core in the region inside the permanent magnet arrangement portion in the axial direction. The rotation balance of the rotor can be performed by the increasing method, and the through-hole can be punched at the same time when the rotor core is punched into a predetermined shape. Therefore, the balancing method can be performed at low cost by the increasing method.
【００９５】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、磁石装着孔の周方向長さが永久
磁石の周方向長さより大きく、永久磁石は磁石装着孔の
周方向のほぼ中央に固定されるから、永久磁石の漏れ磁
束を抑制でき、しかも永久磁石の固定、装着を容易に行
うことができる。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, the circumferential length of the magnet mounting hole is larger than the circumferential length of the permanent magnet, and the permanent magnet is substantially in the circumferential direction of the magnet mounting hole. Since the permanent magnet is fixed at the center, the leakage flux of the permanent magnet can be suppressed, and the permanent magnet can be easily fixed and mounted.
【００９６】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、磁石装着孔の空隙に接着剤を注
入することにより永久磁石が固着されているから、高速
回転に対しても充分な強度を得ることができる。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, the permanent magnet is fixed by injecting the adhesive into the gap of the magnet mounting hole. High strength can be obtained.
【００９７】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、磁石装着孔に永久磁石を嵌め込
み後、磁石装着孔の内周面に形成された凹み部分にエポ
キシ系接着剤等を注入することにより、永久磁石が固着
されているから、高速回転に対しても充分な強度を得る
ことができる。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, after the permanent magnet is fitted into the magnet mounting hole, the epoxy adhesive or the like is inserted into the concave portion formed on the inner peripheral surface of the magnet mounting hole. , The permanent magnet is fixed, so that sufficient strength can be obtained even at high speed rotation.
【００９８】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、永久磁石は磁石装着孔に装着さ
れた状態で着磁されるから、着磁時のパーミアンスが増
加し、着磁が容易となり、また、有効磁束数を増加させ
ることができ、しかも、永久磁石を未着磁のまま装着孔
に装着できるので、磁気吸引力の影響を受けずに装着で
き、生産性の向上に寄与することができる。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, the permanent magnet is magnetized while being mounted in the magnet mounting hole, so that the permeance at the time of magnetization increases, and the magnetization is increased. And the number of effective magnetic fluxes can be increased, and the permanent magnet can be mounted in the mounting hole without being magnetized, so it can be mounted without being affected by the magnetic attraction force, improving productivity. Can contribute.
【００９９】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、永久磁石がネオジウム系希土類
磁石であるから、磁石面積を小さくしても必要なギャッ
プ磁束数を確保でき、所要の出力を得ることが可能とな
る。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, since the permanent magnet is a neodymium rare earth magnet, the necessary gap magnetic flux number can be secured even if the magnet area is reduced, and the required number of gap magnetic fluxes can be secured. Output can be obtained.
【０１００】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、ユニット化された永久磁石型回
転子を複数個用いて軸方向に積層し一体にするものであ
るから、生産性向上とコストダウンを行なうことができ
る。According to the permanent magnet type rotor of the permanent magnet type electric motor according to the next invention, since a plurality of unitized permanent magnet type rotors are laminated in the axial direction and integrated, the productivity is improved. Improvement and cost reduction can be performed.
【０１０１】つぎの発明による永久磁石型電動機の永久
磁石型回転子によれば、ユニット化された永久磁石型回
転子を複数個用いて径方向に所定の角度でずらしながら
軸方向に積層し一体化するものであるから、スキュー効
果によりコギングトルクを更に低減させることができ、
振動や騒音、回転むらも小さくすることができる。According to the permanent magnet rotor of the permanent magnet electric motor according to the next invention, a plurality of unitized permanent magnet rotors are laminated in the axial direction while being shifted at a predetermined angle in the radial direction and integrated. The cogging torque can be further reduced by the skew effect,
Vibration, noise, and uneven rotation can be reduced.
【０１０２】つぎの発明による永久磁石型回転子によれ
ば、内周面に複数個のスロット開口部を備え、集中巻線
を施された固定子鉄心の内側に回転可能に配設されるか
ら、集中巻線を備えた固定子との組合せにより小型、軽
量化を実現することができる。According to the permanent magnet type rotor according to the next invention, a plurality of slot openings are provided on the inner peripheral surface, and the rotor is rotatably disposed inside the stator core on which the concentrated winding is provided. Combination with a stator having a concentrated winding makes it possible to reduce the size and weight.
【図１】 この発明による永久磁石型回転子を組み込ま
れた永久磁石型電動機の実施の形態１を示す軸方向断面
側面図である。FIG. 1 is an axial cross-sectional side view showing a first embodiment of a permanent magnet type electric motor incorporating a permanent magnet type rotor according to the present invention.
【図２】 この発明による永久磁石型回転子を組み込ま
れた永久磁石型電動機の実施の形態１を示す軸に対して
垂直方向の断面図である。FIG. 2 is a cross-sectional view in a direction perpendicular to an axis showing the first embodiment of the permanent magnet type electric motor incorporating the permanent magnet type rotor according to the present invention.
【図３】 この発明による永久磁石型電動機の永久磁石
型回転子の実施の形態１を示す正面図である。FIG. 3 is a front view showing Embodiment 1 of the permanent magnet rotor of the permanent magnet electric motor according to the present invention.
【図４】 ｛（０．８・Ｒａ）／２｝＜Ｒｂ＜｛（１．
８・Ｒａ）／２｝の関係の根拠を示すグラフである。FIG. 4: {(0.8 · Ra) / 2} <Rb <｛(1.
8 is a graph showing the basis of the relationship of 8 · Ra) / 2 ／.
【図５】 （ａ）は実施の形態１にかかる永久磁石型電
動機のコギングトルクを示すグラフ、（ｂ）は従来の永
久磁石型電動機にかかる代表的コギングトルクを示すグ
ラフである。5A is a graph showing a cogging torque of the permanent magnet type electric motor according to the first embodiment, and FIG. 5B is a graph showing a typical cogging torque of the conventional permanent magnet type electric motor.
【図６】 この発明による永久磁石型電動機の永久磁石
型回転子の実施の形態２を示す正面図である。FIG. 6 is a front view showing a second embodiment of the permanent magnet rotor of the permanent magnet electric motor according to the present invention;
【図７】 この発明による永久磁石型電動機の永久磁石
型回転子の実施の形態３を示す軸に対して垂直方向の断
面図である。FIG. 7 is a cross-sectional view in a direction perpendicular to an axis, showing a third embodiment of the permanent magnet rotor of the permanent magnet electric motor according to the present invention;
【図８】 この発明による永久磁石型電動機の永久磁石
型回転子の実施の形態３を示す正面図である。FIG. 8 is a front view showing Embodiment 3 of the permanent magnet rotor of the permanent magnet electric motor according to the present invention.
【図９】 実施の形態３にかかる永久磁石型電動機にお
いて永久磁石型回転子の鉄心磁極部の外周円弧の半径と
コギングトルク・誘起電圧の関係を示すグラフである。FIG. 9 is a graph showing the relationship between the radius of the outer peripheral arc of the core magnetic pole portion of the permanent magnet type rotor, the cogging torque, and the induced voltage in the permanent magnet type electric motor according to the third embodiment.
【図１０】 この発明による永久磁石型電動機の永久磁
石型回転子の実施の形態４を示す正面図である。FIG. 10 is a front view showing a permanent magnet type rotor for a permanent magnet type electric motor according to a fourth embodiment of the present invention;
【図１１】 この発明による永久磁石型電動機の永久磁
石型回転子の実施の形態５を示す正面図である。FIG. 11 is a front view showing Embodiment 5 of the permanent magnet rotor of the permanent magnet electric motor according to the present invention.
【図１２】 この発明による永久磁石型回転子の実施の
形態６を示す正面図である。FIG. 12 is a front view showing a permanent magnet rotor according to a sixth embodiment of the present invention.
【図１３】 この発明による永久磁石型回転子の実施の
形態６を示す軸方向断面図である。FIG. 13 is an axial sectional view showing a sixth embodiment of the permanent magnet rotor according to the present invention.
【図１４】 この発明による永久磁石型回転子の実施の
形態６の他の例を示す正面図である。FIG. 14 is a front view showing another example of Embodiment 6 of the permanent magnet rotor according to the present invention.
【図１５】 この発明による永久磁石型回転子の実施の
形態７を示す正面図である。FIG. 15 is a front view showing a permanent magnet rotor according to a seventh embodiment of the present invention.
【図１６】 この発明による永久磁石型回転子の実施の
形態７を示す軸方向断面図である。FIG. 16 is an axial sectional view showing a seventh embodiment of the permanent magnet rotor according to the present invention.
【図１７】 この発明による永久磁石型回転子の実施の
形態７の他の例を示す正面図である。FIG. 17 is a front view showing another example of the permanent magnet rotor according to the seventh embodiment of the present invention.
【図１８】 この発明による永久磁石型回転子の実施の
形態８を示す部分正面図である。FIG. 18 is a partial front view showing a permanent magnet rotor according to an eighth embodiment of the present invention.
【図１９】 この発明による永久磁石型回転子の実施の
形態９を示す部分正面図である。FIG. 19 is a partial front view showing a ninth embodiment of a permanent magnet rotor according to the present invention.
【図２０】 この発明による永久磁石型回転子の実施の
形態９の他の例を示す正面図である。FIG. 20 is a front view showing another example of the ninth embodiment of the permanent magnet rotor according to the present invention.
【図２１】 この発明による永久磁石型回転子の実施の
形態９の他の例を示す正面図である。FIG. 21 is a front view showing another example of the ninth embodiment of the permanent magnet rotor according to the present invention.
【図２２】 この発明による永久磁石型回転子の実施の
形態１０を示す部分正面図である。FIG. 22 is a partial front view showing a tenth embodiment of a permanent magnet rotor according to the present invention.
【図２３】 この発明による永久磁石型回転子の実施の
形態１１を示す斜視図である。FIG. 23 is a perspective view showing a permanent magnet rotor according to an eleventh embodiment of the present invention.
【図２４】 この発明による永久磁石型回転子の実施の
形態１２を示す斜視図である。FIG. 24 is a perspective view showing a twelfth embodiment of the permanent magnet type rotor according to the present invention.
【図２５】 （ａ）、（ｂ）はそれぞれ従来例の永久磁
石型回転子の構造を示す正面図である。FIGS. 25A and 25B are front views each showing the structure of a conventional permanent magnet rotor.
【図２６】 従来の永久磁石型回転子の別の構造例を示
す正面図である。FIG. 26 is a front view showing another structural example of a conventional permanent magnet rotor.
１０ 固定子、１１ スロット開口部、１２ 固定子鉄
心、１３ 三相巻線、１４ リード線、２０ 永久磁石
型回転子、２１ 回転子鉄心、２２ 磁石装着孔、２３
永久磁石、２４ 鉄心磁極部、２５ 極間部分、２６
外周側両端角部、２７ 貫通孔、２８ 錐孔加工、２
９ 貫通孔、３０ 充填材、３１ 突起部、３２ 段差
部、４０ ロータ軸、４１ 軸受部材、４２ 外側構造
体、５０磁束短絡防止用の開口、５１ 空隙、５２ 凹
部。Reference Signs List 10 stator, 11 slot opening, 12 stator core, 13 three-phase winding, 14 lead wire, 20 permanent magnet type rotor, 21 rotor core, 22 magnet mounting hole, 23
Permanent magnet, 24 core magnetic pole part, 25 pole part, 26
Outer end corners, 27 through holes, 28 drilled holes, 2
9 through-hole, 30 filler, 31 protrusion, 32 step, 40 rotor shaft, 41 bearing member, 42 outer structure, 50 opening for preventing magnetic flux short-circuit, 51 gap, 52 recess.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｈ０２Ｋ 21/14 Ｈ０２Ｋ 21/14 Ｍ Ｆターム(参考） 5H615 AA01 BB01 BB14 BB16 PP02 PP07 PP21 SS03 SS05 SS51 TT05 5H621 AA02 GA01 GA04 GA16 HH01 HH09 JK02 JK05 5H622 AA02 CA02 CA05 CA13 CA14 CB05 CB06 DD02 PP03 PP10 PP11 PP19 QB03 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification code FI Theme coat ゛ (Reference) H02K 21/14 H02K 21/14 MF term (Reference) 5H615 AA01 BB01 BB14 BB16 PP02 PP07 PP21 SS03 SS05 SS51 TT05 5H621 AA02 GA01 GA04 GA16 HH01 HH09 JK02 JK05 5H622 AA02 CA02 CA05 CA13 CA14 CB05 CB06 DD02 PP03 PP10 PP11 PP19 QB03
Claims (20)
等間隔に設けられ鉄心周方向を長辺とし鉄心径方向を短
辺として軸方向に貫通する矩形の磁石装着孔を有し、前
記磁石装着孔のそれぞれに磁極面を鉄心径方向として互
いに隣接する磁極が異なるように永久磁石を装着され、
前記永久磁石のそれぞれの外周側磁極面に形成される鉄
心磁極部の外周形状が、周方向中央部にて鉄心中心より
の距離が最も大きくなり、極間部にて鉄心中心よりの距
離が最も小さくなるような各鉄心磁極部毎の円弧状をな
していることを特徴とする永久磁石型電動機の永久磁石
型回転子。A rectangular magnet mounting hole is provided at equal intervals in the circumferential direction of the rotor core, the number being equal to the number of poles of the rotor, and penetrates in the axial direction with the long side in the circumferential direction of the core and the short side in the radial direction of the core. A permanent magnet is mounted on each of the magnet mounting holes such that magnetic pole surfaces adjacent to each other are different with the magnetic pole surface being the iron core radial direction,
The outer peripheral shape of the core magnetic pole portion formed on the outer peripheral magnetic pole surface of each of the permanent magnets is such that the distance from the center of the iron core is largest at the center in the circumferential direction, and the distance from the center of the iron core is the largest at the gap between the poles. A permanent magnet type rotor of a permanent magnet type electric motor characterized in that each core magnetic pole portion is formed in an arc shape so as to be small.
の径方向距離をＲａ、前記鉄心磁極部の外周円弧の半径
をＲｂ、前記鉄心中心と極間部との径方向距離をＲｐと
した場合、Ｒａ＞Ｒｂで、０．５ｍｍ＜（Ｒａ−Ｒｐ）
＜５ｍｍの関係になるよう形成されていることを特徴と
する請求項１に記載の永久磁石型電動機の永久磁石型回
転子。2. The radial distance between the center of the iron core and the circumferential center of the core magnetic pole portion is Ra, the radius of the outer circumferential arc of the core magnetic pole portion is Rb, and the radial distance between the center of the iron core and the inter-pole portion is Rp. When Ra> Rb, 0.5 mm <(Ra−Rp)
The permanent magnet type rotor of a permanent magnet type electric motor according to claim 1, wherein the rotor is formed so as to have a relation of <5 mm.
の径方向距離をＲａ、前記鉄心磁極部の外周円弧の半径
をＲｂとし、回転子の極数を８極とした場合、｛（０．
８・Ｒａ）／２｝＜Ｒｂ＜｛（１．８・Ｒａ）／２｝の
関係になるように形成されていることを特徴とする請求
項１に記載の永久磁石型電動機の永久磁石型回転子。3. When the radial distance between the center of the iron core and the circumferential center of the iron core magnetic pole part is Ra, the radius of the outer circumferential arc of the iron core magnetic pole part is Rb, and the number of poles of the rotor is eight poles, (0.
The permanent magnet type electric motor according to claim 1, wherein the relationship is established as follows: (8 · Ra) / 2｝ <Rb <{(1.8 · Ra) / 2}. Rotor.
法をＬａ、前記永久磁石の外周側磁極面と前記鉄心磁極
部の外周面との最小寸法をＬｂとした場合、０．３ｍｍ
＜Ｌａ＜３．０ｍｍで、０．３ｍｍ＜Ｌｂ＜５．０ｍｍ
の関係になるように形成されていることを特徴とする請
求項１〜３のいずれか一つに記載の永久磁石型電動機の
永久磁石型回転子。4. When the minimum dimension between the permanent magnets adjacent to each other is La, and the minimum dimension between the outer peripheral magnetic pole surface of the permanent magnet and the outer peripheral surface of the core magnetic pole portion is Lb, 0.3 mm
<La <3.0 mm, 0.3 mm <Lb <5.0 mm
The permanent magnet type rotor of a permanent magnet type electric motor according to any one of claims 1 to 3, wherein the rotor is formed so as to satisfy the following relationship.
半径の円弧で連結されていることを特徴とする請求項１
〜４のいずれか一つに記載の永久磁石型電動機の永久磁
石型回転子。5. The method according to claim 1, wherein the gaps between the outer circumferences of the adjacent core magnetic pole portions are connected by an arc having a small radius.
5. A permanent magnet type rotor for a permanent magnet type electric motor according to any one of items 1 to 4.
径Ｒｃによる円弧で連結された形状とされ、前記磁石装
着孔の外周側両端角部が半径Ｒｄによるアール形状とさ
れ、前記磁石装着孔の径方向寸法をＬｃとした場合、Ｒ
ｃ＜（Ｒｂ／２）で、Ｒｄ＜Ｌｃの関係になるように形
成されていることを特徴とする請求項５に記載の永久磁
石型電動機の永久磁石型回転子。6. The magnet mounting portion according to claim 6, wherein the outer periphery of the adjacent core magnetic pole portion has a shape in which the poles are connected by an arc having a radius of Rc, and both outer corners of the magnet mounting hole have a radius shape having a radius of Rd. When the radial dimension of the hole is Lc, R
6. The permanent magnet type rotor according to claim 5, wherein c <(Rb / 2) and Rd <Lc.
Ｒｄによるアール形状とされ、前記磁石装着孔の径方向
寸法をＬｃとした場合、Ｒｄ＜Ｌｃの関係になるように
形成されていることを特徴とする請求項１〜５のいずれ
か一つに記載の永久磁石型電動機の永久磁石型回転子。7. An outer peripheral corner of the magnet mounting hole is formed in a round shape with a radius Rd, and when a radial dimension of the magnet mounting hole is Lc, a relationship of Rd <Lc is established. The permanent magnet type rotor of a permanent magnet type electric motor according to any one of claims 1 to 5, wherein
束短絡防止用の開口が軸方向に貫通して形成されている
ことを特徴とする請求項１〜７のいずれか一つに記載の
永久磁石型電動機の永久磁石型回転子。8. The method according to claim 1, wherein an opening for preventing a magnetic flux short circuit is formed between the adjacent magnet mounting holes so as to penetrate in the axial direction. Permanent magnet rotor of permanent magnet motor.
着孔との間の最小寸法をＬｄ、前記磁束短絡防止用の開
口と前記鉄心極間部の外周面との間の最小寸法をＬｅと
した場合、ＬｄとＬｅがほぼ等しく、０．３ｍｍ＜（Ｌ
ｄおよびＬｅ）＜３ｍｍの関係になるように前記磁束短
絡防止用の開口が形成されていることを特徴とする請求
項８に記載の永久磁石型電動機の永久磁石型回転子。9. A minimum dimension between the magnetic flux short-circuit preventing opening and the magnet mounting hole is Ld, and a minimum dimension between the magnetic flux short-circuit preventing opening and the outer peripheral surface of the core gap is Le. , Ld and Le are almost equal, and 0.3 mm <(L
9. The permanent magnet type rotor of a permanent magnet type electric motor according to claim 8, wherein the opening for preventing the magnetic flux short circuit is formed such that d and Le) <3 mm.
層体により構成され、前記鉄心磁極部外周の極間部がレ
ーザ溶接等により軸方向に溶接されていることにより一
体化されていることを特徴とする請求項１〜９のいずれ
か一つに記載の永久磁石型電動機の永久磁石型回転子。10. The rotor core is formed of a laminated body of steel plates having the same shape, and is integrated by being welded in an axial direction by laser welding or the like at an outer peripheral portion of the magnetic pole portion of the iron core. The permanent magnet type rotor of the permanent magnet type electric motor according to any one of claims 1 to 9, characterized in that:
回転子鉄心に軸方向に貫通する貫通孔が形成され、前記
貫通孔を下錐孔として減量法により回転子の回転バラン
ス取りを行うことを特徴とする請求項１〜１０のいずれ
か一つに記載の永久磁石型電動機の永久磁石型回転子。11. A through-hole penetrating in the axial direction is formed in a rotor core in an area inside the arrangement portion of the permanent magnet, and the rotation of the rotor is balanced by a weight reduction method using the through-hole as a lower conical hole. The permanent magnet type rotor of the permanent magnet type electric motor according to any one of claims 1 to 10, wherein
回転子鉄心に軸方向に貫通する貫通孔が形成され、前記
貫通孔に充填材を充填する増量法により回転子の回転バ
ランス取りを行うことを特徴とする請求項１〜１０のい
ずれか一つに記載の永久磁石型電動機の永久磁石型回転
子。12. A through hole penetrating in the axial direction is formed in a rotor core in a region inside the permanent magnet arrangement portion, and rotation of the rotor is balanced by an increasing method of filling the through hole with a filler. The permanent magnet type rotor of a permanent magnet type electric motor according to any one of claims 1 to 10, wherein
久磁石の周方向長さより大きく、前記永久磁石を前記磁
石装着孔の周方向のほぼ中央に固定する手段を有してい
ることを特徴とする請求項１〜１２のいずれか一つに記
載の永久磁石型電動機の永久磁石型回転子。13. The magnet mounting hole according to claim 1, wherein a circumferential length of the magnet mounting hole is larger than a circumferential length of the permanent magnet, and a means for fixing the permanent magnet substantially at a center of the magnet mounting hole in a circumferential direction is provided. A permanent magnet type rotor for a permanent magnet type electric motor according to claim 1.
込まれた後に、前記磁石装着孔の空隙にエポキシ系接着
剤等が注入され、前記永久磁石の固着が行われているこ
とを特徴とする請求項１３に記載の永久磁石型電動機の
永久磁石型回転子。14. After the permanent magnet is fitted into the magnet mounting hole, an epoxy-based adhesive or the like is injected into a gap of the magnet mounting hole to fix the permanent magnet. A permanent magnet type rotor for a permanent magnet type electric motor according to claim 13.
ヶ所に拡張形成された凹部分を有し、前記磁石装着孔に
前記永久磁石が嵌め込まれた後に、前記凹部分にエポキ
シ系接着剤等が注入され、前記永久磁石の固着が行われ
ていることを特徴とする請求項１〜１２のいずれか一つ
に記載の永久磁石型電動機の永久磁石型回転子。15. At least one along the magnet mounting hole
After the permanent magnet is fitted into the magnet mounting hole, an epoxy-based adhesive or the like is injected into the concave portion to fix the permanent magnet. The permanent magnet type rotor of a permanent magnet type electric motor according to any one of claims 1 to 12, wherein
された状態で着磁されることを特徴とする請求項１〜１
５のいずれか一つに記載の永久磁石型電動機の永久磁石
型回転子。16. The apparatus according to claim 1, wherein said permanent magnet is magnetized in a state of being mounted in said magnet mounting hole.
5. A permanent magnet type rotor of the permanent magnet type electric motor according to any one of the above items 5.
石であることを特徴とする請求項１〜１６のいずれか一
つに記載の永久磁石型電動機の永久磁石型回転子。17. The permanent magnet rotor according to claim 1, wherein the permanent magnet is a neodymium rare earth magnet.
の永久磁石型回転子をユニットとして複数個用いられ、
当該ユニットが軸方向に所定個数を連結され、一体化さ
れていることを特徴とする永久磁石型電動機の永久磁石
型回転子。18. A plurality of permanent magnet type rotors according to claim 1 are used as a unit,
A permanent magnet type rotor of a permanent magnet type electric motor, wherein a predetermined number of the units are connected and integrated in the axial direction.
らして軸方向に所定個数を連結され、一体化されている
ことを特徴とする請求項１８に記載の永久磁石型電動機
の永久磁石型回転子。19. The permanent magnet type rotation of a permanent magnet type electric motor according to claim 18, wherein a predetermined number of said units are connected in the axial direction by being shifted by a predetermined angle in a radial direction. Child.
え、集中巻線を施された固定子鉄心の内側に回転可能に
配設されることを特徴とする請求項１〜１９のいずれか
一つに記載の永久磁石型電動機の永久磁石型回転子。20. The method according to claim 1, wherein a plurality of slot openings are provided on the inner peripheral surface, and the plurality of slot openings are rotatably disposed inside the stator core on which the concentrated windings are provided. A permanent magnet rotor of the permanent magnet electric motor according to any one of the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11187835A JP2000197292A (en) | 1998-10-21 | 1999-07-01 | Permanent-magnet rotor of permanent-magnet mounted motor |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10-299992 | 1998-10-21 | ||
| JP29999298 | 1998-10-21 | ||
| JP11187835A JP2000197292A (en) | 1998-10-21 | 1999-07-01 | Permanent-magnet rotor of permanent-magnet mounted motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000197292A true JP2000197292A (en) | 2000-07-14 |
Family
ID=26504590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11187835A Pending JP2000197292A (en) | 1998-10-21 | 1999-07-01 | Permanent-magnet rotor of permanent-magnet mounted motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000197292A (en) |
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-
1999
- 1999-07-01 JP JP11187835A patent/JP2000197292A/en active Pending
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