JP2003092846A - Embedded magnet motor - Google Patents
Embedded magnet motorInfo
- Publication number
- JP2003092846A JP2003092846A JP2001284641A JP2001284641A JP2003092846A JP 2003092846 A JP2003092846 A JP 2003092846A JP 2001284641 A JP2001284641 A JP 2001284641A JP 2001284641 A JP2001284641 A JP 2001284641A JP 2003092846 A JP2003092846 A JP 2003092846A
- Authority
- JP
- Japan
- Prior art keywords
- plane
- magnet
- type motor
- stator
- embedded
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Landscapes
- 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】本発明は、永久磁石を埋め込
んだロータ等の可動子を備えた埋込磁石型モータに関す
る。この埋込磁石型モータは、電動パワーステアリング
装置、電気自動車、エアコン等に用いて好適である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embedded magnet type motor having a mover such as a rotor in which a permanent magnet is embedded. This embedded magnet type motor is suitable for use in an electric power steering device, an electric vehicle, an air conditioner, and the like.
【０００２】[0002]
【従来の技術】従来、図６に示す埋込磁石型モータ（以
下「ＩＰＭモータ」という。）が知られている。このＩ
ＰＭモータは、電機子巻線８７をもつ固定子としてのス
テータ８５と、このステータ８５との間に間隙Ｇを有し
て対面し、ステータ８５に対して相対回転可能な可動子
としてのロータ８１とを備えている。ロータ８１は、軸
心回りで等ピッチに複数個の磁石穴８３が配置された磁
性材料製の可動子本体としてのロータ本体８２と、この
ロータ本体８２の各磁石穴８３に挿入された永久磁石８
４とを有している。2. Description of the Related Art Conventionally, an embedded magnet type motor (hereinafter referred to as "IPM motor") shown in FIG. 6 is known. This I
The PM motor faces a stator 85, which is a stator having an armature winding 87, with a gap G between the stator 85 and a rotor 81, which is a movable element that is rotatable relative to the stator 85. It has and. The rotor 81 includes a rotor body 82 as a mover body made of a magnetic material, in which a plurality of magnet holes 83 are arranged at equal pitches around an axis, and permanent magnets inserted in the magnet holes 83 of the rotor body 82. 8
4 and.
【０００３】このＩＰＭモータによれば、ロータ本体８
２に永久磁石８４が埋め込まれているため、高速回転で
も永久磁石８４の飛散を防止でき、安全性において優れ
ている。また、図７に示すように、永久磁石８４による
磁石トルクＴｍに加え、逆突極性に起因するリラクタン
ストルクＴｒも有効に利用できることから、高いモータ
トルクＴが得られる。つまり、磁石トルクＴｍを効率的
に発生させる電流進み角（０°）とリラクタンストルク
Ｔｒを効率的に発生させる電流進み角（４５°）との間
の電流進み角（α°）で運転することにより、高いモー
タトルクＴが得られる。さらには、電流と電流進み角と
の調整による弱め励磁制御を採用することにより、高速
領域での運転が可能となる（電気学会論文誌（ｖｏｌ．
１２１、ｎｏ．７、ｐ４４８〜ｐ４４９、２００１）参
照）。これらの理由により、ＩＰＭモータは、特に電動
パワーステアリング装置、電気自動車、エアコンのモー
タとして注目されている。According to this IPM motor, the rotor body 8
Since the permanent magnet 84 is embedded in No. 2, the permanent magnet 84 can be prevented from scattering even at high speed rotation, which is excellent in safety. Further, as shown in FIG. 7, in addition to the magnet torque Tm generated by the permanent magnet 84, the reluctance torque Tr caused by the reverse saliency can be effectively used, so that a high motor torque T can be obtained. That is, the operation is performed at a current advance angle (α °) between the current advance angle (0 °) that efficiently generates the magnet torque Tm and the current advance angle (45 °) that efficiently generates the reluctance torque Tr. Thus, a high motor torque T can be obtained. Further, by adopting the weak magnetic excitation control by adjusting the current and the current lead angle, it becomes possible to operate in the high speed region (Journal of the Institute of Electrical Engineers of Japan (vol.
121, no. 7, p448-p449, 2001)). For these reasons, the IPM motor has been attracting attention as a motor for electric power steering devices, electric vehicles, and air conditioners.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記従来のＩ
ＰＭモータでは、図８に示すように、磁石穴８３及び永
久磁石８４の公差により、磁石穴８３と永久磁石８４と
の間にエアギャップＡ１、Ａ２が生じ得る。製造コスト
を考慮すれば、一般に、磁石穴８３の公差は±０．０３
ｍｍ程度であり、永久磁石８４の公差は±０．０５ｍｍ
程度である。ここで、永久磁石８４を確実に磁石穴８３
に挿入可能とするため、永久磁石８４は磁石穴８３より
両公差の合計分の０．０８ｍｍだけ小さく設計される。
そのため、組付け段階においては、エアギャップＡ１、
Ａ２は最大で０．１６ｍｍになってしまう。However, the above-mentioned conventional I
In the PM motor, as shown in FIG. 8, due to the tolerance of the magnet hole 83 and the permanent magnet 84, air gaps A1 and A2 may be formed between the magnet hole 83 and the permanent magnet 84. Considering the manufacturing cost, the tolerance of the magnet hole 83 is generally ± 0.03.
mm, the tolerance of the permanent magnet 84 is ± 0.05 mm
It is a degree. Here, the permanent magnet 84 is securely attached to the magnet hole 83.
The permanent magnet 84 is designed to be smaller than the magnet hole 83 by 0.08 mm, which is the total of both tolerances, so that it can be inserted into.
Therefore, the air gap A1,
The maximum A2 is 0.16 mm.
【０００５】こうして、磁石穴８３と永久磁石８４との
間にエアギャップＡ１、Ａ２が生じると、動作中におい
て、磁石穴８３内で永久磁石８４の位置がずれる虞があ
る。この場合には、ステータ８５とロータ８１との間に
生じる磁気回路の磁気抵抗がばらつくことになるため、
磁石トルクＴｍが変動し、トルクリップルが大きくな
る。When the air gaps A1 and A2 are formed between the magnet hole 83 and the permanent magnet 84 in this manner, the position of the permanent magnet 84 may be displaced in the magnet hole 83 during operation. In this case, since the magnetic resistance of the magnetic circuit generated between the stator 85 and the rotor 81 varies,
The magnet torque Tm fluctuates and the torque ripple increases.
【０００６】特に、これら磁石穴８３と永久磁石８４と
の間のエアギャップＡ１、Ａ２のうち、径方向、つまり
ステータ８５とロータ８１との間に存在する間隙Ｇの方
向のエアギャップＡ１が存在すると、ステータ８５とロ
ータ８１との間に生じる磁気回路の磁気抵抗が大きくな
り、磁石トルクＴｍが低下し、モータトルクＴも低下す
る。また、各磁石穴８３でエアギャップＡ１がばらつく
ことにより、トルクリップルが大きくなる。Of the air gaps A1 and A2 between the magnet holes 83 and the permanent magnets 84, there is an air gap A1 in the radial direction, that is, in the direction of the gap G existing between the stator 85 and the rotor 81. Then, the magnetic resistance of the magnetic circuit generated between the stator 85 and the rotor 81 increases, the magnet torque Tm decreases, and the motor torque T also decreases. Further, since the air gap A1 varies in each magnet hole 83, the torque ripple becomes large.
【０００７】この点、磁石穴８３の永久磁石８４をバネ
で一方向に押圧したＩＰＭモータが提案されている（特
開２０００−１７５３８８号公報）。このＩＰＭモータ
によれば、永久磁石８４がバネで径外方向に押圧されて
いるため、動作中であっても、磁石穴８３内において永
久磁石８４の位置がずれることはない。このため、この
ＩＰＭモータによれば、トルクリップルを小さくするこ
とができる。In this respect, an IPM motor has been proposed in which the permanent magnet 84 of the magnet hole 83 is pressed in one direction by a spring (Japanese Patent Laid-Open No. 2000-175388). According to this IPM motor, since the permanent magnet 84 is pressed radially outward by the spring, the position of the permanent magnet 84 in the magnet hole 83 does not shift even during operation. Therefore, according to this IPM motor, the torque ripple can be reduced.
【０００８】しかしながら、このＩＰＭモータであって
も、磁石穴８３と永久磁石８４との間の径方向のエアギ
ャップＡ１は依然として存在している。そのため、磁気
回路の磁気抵抗は依然として大きく、駆動力の向上を期
待できない。However, even in this IPM motor, the radial air gap A1 between the magnet hole 83 and the permanent magnet 84 still exists. Therefore, the magnetic resistance of the magnetic circuit is still large, and improvement in driving force cannot be expected.
【０００９】本発明は、上記従来の実情に鑑みてなされ
たものであって、大きな駆動力が得られるとともにリッ
プルを小さくすることができる埋込磁石型モータを提供
することを解決すべき課題としている。The present invention has been made in view of the above-mentioned conventional circumstances, and it is an object to be solved to provide an embedded magnet type motor capable of obtaining a large driving force and reducing ripples. There is.
【００１０】[0010]
【課題を解決するための手段】本発明の埋込磁石型モー
タは、電機子巻線をもつ固定子と、該固定子との間に間
隙を有して対面し、該固定子に対して相対移動可能な可
動子とを備え、該可動子は、等間隔に複数個の磁石穴が
配置された磁性材料製の可動子本体と、該可動子本体の
各該磁石穴に挿入された永久磁石とを有して構成された
埋込磁石型モータにおいて、各前記磁石穴は前記間隙側
の第１平面と該第１平面に対面する第２平面とが平行で
なく、各前記永久磁石は前記間隙側に位置される第３平
面と該第３平面に対面する第４平面とが平行でなく、該
第１平面と該第２平面とが仮想的に交差する第１頂線の
内角と該第３平面と該第４平面とが仮想的に交差する第
２頂線の内角とは等しく、各該永久磁石は各該磁石穴内
で該第１頂線に該第２頂線が近づく方向に付勢手段によ
って付勢されていることを特徴とする。An embedded magnet type motor according to the present invention faces a stator having an armature winding with a gap between the stator and the stator. A movable element made of a magnetic material in which a plurality of magnet holes are arranged at equal intervals; and a permanent element inserted in each of the magnet holes of the movable element body. In the embedded magnet type motor having a magnet, each of the magnet holes is such that the first plane on the gap side and the second plane facing the first plane are not parallel to each other, and An inner angle of a first apex where the third plane located on the gap side and the fourth plane facing the third plane are not parallel to each other and the first plane and the second plane virtually intersect with each other; The interior angle of the second apex line where the third plane and the fourth plane virtually intersect is equal to each other, and each of the permanent magnets is connected to the first apex line in each of the magnet holes. Characterized in that it is biased by biasing means in a direction 2 top line approaches.
【００１１】本発明のＩＰＭモータでは、各永久磁石の
第３平面又は第４平面が各磁石穴の第１平面又は第２平
面と必ず当接し、各永久磁石の第４平面又は第３平面が
各磁石穴の第２平面又は第１平面と必ず当接することと
なる。このため、間隙の方向にエアギャップが生じな
い。このため、このＩＰＭモータでは、固定子と可動子
との間に生じる磁気回路の磁気抵抗を抑えられ、駆動力
を大きく維持することができる。また、前記エアギャッ
プが生じない以上、前記エアギャップのばらつきは生じ
ず、トルクリップルを小さくできる。In the IPM motor of the present invention, the third plane or the fourth plane of each permanent magnet is always in contact with the first plane or the second plane of each magnet hole, and the fourth plane or the third plane of each permanent magnet is It always comes into contact with the second plane or the first plane of each magnet hole. Therefore, no air gap is generated in the direction of the gap. Therefore, in this IPM motor, the magnetic resistance of the magnetic circuit generated between the stator and the mover can be suppressed, and the driving force can be largely maintained. Further, as long as the air gap is not generated, the air gap does not vary, and the torque ripple can be reduced.
【００１２】また、このＩＰＭモータでは、付勢手段に
よって、各永久磁石の第３平面又は第４平面が各磁石穴
の第１平面又は第２平面と当接し、各永久磁石の第４平
面又は第３平面が各磁石穴の第２平面又は第１平面と当
接した状態が維持されるため、動作中において、磁石穴
内で永久磁石の位置がずれることがない。そのため、磁
気回路の磁気抵抗の変動を防止することができ、リップ
ルが小さくなる。Further, in this IPM motor, the third plane or the fourth plane of each permanent magnet is brought into contact with the first plane or the second plane of each magnet hole by the biasing means, and the fourth plane of each permanent magnet or Since the state in which the third plane is in contact with the second plane or the first plane of each magnet hole is maintained, the position of the permanent magnet does not shift in the magnet hole during operation. Therefore, the fluctuation of the magnetic resistance of the magnetic circuit can be prevented, and the ripple becomes small.
【００１３】したがって、本発明のＩＰＭモータによれ
ば、大きな駆動力が得られるとともにリップルを小さく
することができる。Therefore, according to the IPM motor of the present invention, a large driving force can be obtained and the ripple can be reduced.
【００１４】第１平面と第２平面とはこれらに直交する
断面視で等脚台形の脚をなし、第３平面と第４平面とも
これらに直交する断面視で等脚台形の脚をなしているこ
とが好ましい。特に、各磁石穴は底面が等脚台形の四角
柱状であり、各永久磁石も底面が等脚台形の四角柱状で
あることが好ましい。こうであれば、製造が容易である
とともに、永久磁石を磁石穴に挿入する方向が限定され
ないことから、組付けが容易だからである。The first plane and the second plane form an isosceles trapezoidal leg in a sectional view orthogonal to these, and the third plane and the fourth plane also form an isosceles trapezoidal leg in a sectional view orthogonal to these. Is preferred. In particular, it is preferable that the bottom of each magnet hole is an isosceles trapezoidal quadrangular prism, and each permanent magnet is also an isosceles trapezoidal quadrangular prism. This is because the manufacturing is easy, and the direction in which the permanent magnet is inserted into the magnet hole is not limited, so that the assembly is easy.
【００１５】また、各磁石穴は各第１頂線が全て同一方
向に向いていることもできるが、隣り合う２個の磁石穴
は各第１頂線が向き合っていることが好ましい。つま
り、各磁石穴は底面が等脚台形の四角柱状であり、各永
久磁石も底面が等脚台形の四角柱状である場合、各磁石
穴は底面の下底同士又は上底同士が隣り合っていること
が好ましい。これにより、可動子の移動方向の相違によ
る磁束密度の差を防止できるため、可動子が両方向に滑
らかに移動できる。Further, the first top lines of the magnet holes may all face in the same direction, but it is preferable that the first top lines of two adjacent magnet holes face each other. That is, when the bottom of each magnet hole is an isosceles trapezoidal quadrangular prism and each bottom of the permanent magnet is also an isosceles trapezoidal quadrangular prism, the bottoms of the bottoms or the tops of the bottoms of the magnets are adjacent to each other. Is preferred. As a result, it is possible to prevent a difference in magnetic flux density due to a difference in moving direction of the mover, so that the mover can smoothly move in both directions.
【００１６】付勢手段としては、コイルバネ、ゴム等を
採用することができるが、板バネを採用することが好ま
しい。板バネは、小型で比較的大きな付勢力を付与でき
ることから、磁石穴と永久磁石との間に容易に組付ける
ことができるとともに、確実に永久磁石を磁石穴内で第
１頂線に第２頂線が近づく方向に付勢することができる
からである。As the urging means, a coil spring, rubber or the like can be used, but it is preferable to use a leaf spring. Since the leaf spring is small and can apply a relatively large urging force, it can be easily assembled between the magnet hole and the permanent magnet, and the permanent magnet can be securely attached to the first top line and the second top line in the magnet hole. This is because the line can be urged in the approaching direction.
【００１７】[0017]
【発明の実施の形態】以下、本発明を具体化した実施形
態を図面を参照しつつ説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.
【００１８】実施形態のＩＰＭモータ１０は、図６に示
す電機子巻線８７をもつ固定子としてのステータ８５
と、このステータ８５との間に間隙Ｇを有して対面し、
ステータ８５に対して相対回転可能な可動子としての図
１に示すロータ１とを備えている。The IPM motor 10 of the embodiment has a stator 85 as a stator having an armature winding 87 shown in FIG.
And the stator 85 with a gap G between them,
The rotor 1 shown in FIG. 1 is provided as a mover that can rotate relative to the stator 85.
【００１９】ロータ１は、軸心回りで等ピッチに複数個
の磁石穴３が配置されたロータ本体２と、このロータ本
体２の各磁石穴３に挿入された永久磁石４とを有してい
る。The rotor 1 has a rotor body 2 in which a plurality of magnet holes 3 are arranged at equal pitches around an axis, and a permanent magnet 4 inserted in each magnet hole 3 of the rotor body 2. There is.
【００２０】ロータ本体２は積層したケイ素鋼板からな
る。ロータ本体２の各磁石穴３は、図２に示すように、
底面が上底ｌ３、下底ｌ４及び脚ｌ１、ｌ２からなる等
脚台形をなし、軸方向に高さを有する四角柱状に形成さ
れている。間隙Ｇ側の脚ｌ１によって形成される第１平
面３ａと、脚ｌ２によって形成され、第１平面３ａに対
面する第２平面３ｂとは平行でなく、これら第１平面３
ａと第２平面３ｂとは第１頂線Ｌ１によって仮想的に交
差している。The rotor body 2 is made of laminated silicon steel plates. Each magnet hole 3 of the rotor body 2 is, as shown in FIG.
The bottom surface is an isosceles trapezoid consisting of an upper bottom l3, a lower bottom l4 and legs l1 and l2, and is formed in a quadrangular prism shape having a height in the axial direction. The first plane 3a formed by the leg 11 on the side of the gap G and the second plane 3b formed by the leg 12 and facing the first plane 3a are not parallel to each other and these first plane 3
a and the second plane 3b virtually intersect with each other at a first apex line L1.
【００２１】他方、各永久磁石４はネオジム−鉄−ボロ
ン系のものである。各各永久磁石４も底面が上底ｌ７、
下底ｌ８及び脚ｌ５、ｌ６からなる等脚台形をなし、軸
方向に高さを有する四角柱状に形成されている。間隙Ｇ
側に位置される脚ｌ５によって形成される第３平面４ａ
と、脚ｌ６によって形成され、第３平面４ａに対面する
第４平面４ｂとは平行でなく、これら第３平面４ａと第
４平面４ｂとは第２頂線Ｌ２によって仮想的に交差して
いる。On the other hand, each permanent magnet 4 is of the neodymium-iron-boron system. The bottom of each of the permanent magnets 4 is also an upper bottom 17,
The trapezoid is an isosceles trapezoid including a lower bottom 18 and legs 15 and 16 and is formed in a rectangular column shape having a height in the axial direction. Gap G
Third plane 4a formed by the leg 15 located on the side
And the fourth plane 4b formed by the leg 16 and facing the third plane 4a are not parallel to each other, and the third plane 4a and the fourth plane 4b virtually intersect with each other by the second top line L2. .
【００２２】そして、第１頂線Ｌ１の内角θ１と第２頂
線Ｌ２の内角θ２とは等しい。また、各磁石穴３内には
各永久磁石４との間に付勢手段としての板バネ５が挿入
されており、各永久磁石４は、各板バネ５により、各磁
石穴３内で第１頂線Ｌ１に第２頂線Ｌ２が近づく方向、
つまり各上底ｌ３、ｌ７が近づく方向に付勢されてい
る。The interior angle θ1 of the first apex line L1 and the interior angle θ2 of the second apex line L2 are equal. Further, a leaf spring 5 as an urging means is inserted between each magnet hole 3 and each permanent magnet 4, and each permanent magnet 4 is moved by each leaf spring 5 in each magnet hole 3. The direction in which the second top line L2 approaches the first top line L1,
That is, the upper bases 13 and 17 are urged toward each other.
【００２３】また、図１に示すように、隣り合う２個の
磁石穴３は各第１頂線Ｌ１が向き合っている。つまり、
各磁石穴３は底面の下底ｌ４同士又は上底ｌ３同士が隣
り合っており、各磁石穴３内の永久磁石４は底面の下底
ｌ８同士又は上底ｌ７同士が隣り合っている。各永久磁
石４は間隙Ｇ側が交互にＳ極、Ｎ極となるように配置さ
れている。Further, as shown in FIG. 1, the first apex lines L1 of the two adjacent magnet holes 3 face each other. That is,
The bottoms 14 of the bottoms of the magnet holes 3 are adjacent to each other, or the tops 13 of the magnets 3 are adjacent to each other, and the bottoms 18 of the bottoms or the tops 17 of the permanent magnets 4 in each magnet hole 3 are adjacent to each other. The permanent magnets 4 are arranged so that the gap G side is alternately the S pole and the N pole.
【００２４】以上のように構成されたロータ１は以下の
ようにして製造される。まず、ケイ素鋼板を用意し、こ
のケイ素鋼板をダイ及びパンチにより打ち抜く。これに
より、図３に示すように、複数の打抜穴８と複数のダボ
９とを有する打抜板７を得る。そして、打抜板７を打ち
抜きつつ積層する。積層の際、ダボ９を使用して各打抜
板７を固定し、図１に示すロータ本体２を得る。こうし
て、積層された打抜板７の各打抜穴８により、ロータ本
体２の各磁石穴３が形成される。The rotor 1 configured as described above is manufactured as follows. First, a silicon steel plate is prepared, and this silicon steel plate is punched with a die and a punch. Thereby, as shown in FIG. 3, a punching plate 7 having a plurality of punching holes 8 and a plurality of dowels 9 is obtained. Then, the punching plates 7 are punched and stacked. At the time of stacking, the punching plates 7 are fixed by using the dowels 9 to obtain the rotor body 2 shown in FIG. In this way, the punched holes 8 of the stacked punched plates 7 form the magnet holes 3 of the rotor body 2.
【００２５】次に、各磁石穴３に各永久磁石４を挿入す
る。この際、各磁石穴３は底面が等脚台形の四角柱状で
あり、各永久磁石４も底面が等脚台形の四角柱状である
ため、製造が容易であるとともに、各永久磁石４を各磁
石穴３に挿入する方向が限定されず、組付けが容易であ
る。Next, each permanent magnet 4 is inserted into each magnet hole 3. At this time, the bottom of each magnet hole 3 is an isosceles trapezoidal quadrangular prism, and the bottom of each permanent magnet 4 is also an isosceles trapezoidal quadrangular prism. Therefore, it is easy to manufacture, and each permanent magnet 4 is attached to each magnet. The direction of insertion into the hole 3 is not limited, and the assembly is easy.
【００２６】そして、各磁石穴３と各永久磁石４との間
に板バネ５を挿入する。板バネ５は、小型で比較的大き
な付勢力を付与できることから、容易に組付けることが
できるとともに、各磁石穴３内で各上底ｌ３、ｌ７が近
づく方向に各永久磁石４を確実に付勢することができ
る。Then, the leaf spring 5 is inserted between each magnet hole 3 and each permanent magnet 4. Since the leaf spring 5 is small and can apply a relatively large biasing force, it can be easily assembled, and the permanent magnets 4 are surely attached to the magnet holes 3 in a direction in which the upper bases 13 and 17 approach each other. It can be energized.
【００２７】最後に、各永久磁石４の外周側が交互にＳ
極、Ｎ極となるように着磁して、ロータ１が得られる。Finally, the outer peripheral side of each permanent magnet 4 is alternately changed to S.
The rotor 1 is obtained by magnetizing so as to have poles and N poles.
【００２８】このＩＰＭモータ１０は、図４に示す電動
パワーステアリング装置に用いられる。この電動パワー
ステアリング装置では、ステアリングホイール９０と接
続されたステアリングシャフト９１の先端にピニオン９
２が設けられ、このピニオン９２はステアリングシャフ
ト９１とともに回転するようになっている。ピニオン９
２にはラックバー９３が噛合されており、このラックバ
ー９３はステアリングシャフト９１の回転運動を長手方
向の直線運動に変換してタイヤ９４の操舵角を変更させ
るようになっている。これらピニオン９２及びラックバ
ー９３はハウジング９５によって収容されている。ま
た、ハウジング９５内にＩＰＭモータ１０も収容されて
おり、ステアリングシャフト９１に作用するトルク等の
検出により、ラックバー９３をアシストできるようにな
っている。The IPM motor 10 is used in the electric power steering system shown in FIG. In this electric power steering device, a pinion 9 is attached to the tip of a steering shaft 91 connected to a steering wheel 90.
2 is provided, and this pinion 92 is adapted to rotate together with the steering shaft 91. Pinion 9
A rack bar 93 is meshed with the rack bar 2, and the rack bar 93 converts the rotational movement of the steering shaft 91 into a linear movement in the longitudinal direction to change the steering angle of the tire 94. The pinion 92 and the rack bar 93 are accommodated in a housing 95. Further, the IPM motor 10 is also housed in the housing 95, and the rack bar 93 can be assisted by detecting the torque acting on the steering shaft 91.
【００２９】図５に示すように、ラックバー９３の一端
は円筒面９３ａを有し、円筒面９３ａにはネジ溝９３ｂ
が形成されている。そして、円筒面９３ａはボールネジ
８８を介してＩＰＭモータ１０のロータ１と接続されて
いる。また、ＩＰＭモータ１０のステータ８５はハウジ
ング９５に固定されている。As shown in FIG. 5, one end of the rack bar 93 has a cylindrical surface 93a, and the cylindrical surface 93a has a thread groove 93b.
Are formed. The cylindrical surface 93a is connected to the rotor 1 of the IPM motor 10 via the ball screw 88. The stator 85 of the IPM motor 10 is fixed to the housing 95.
【００３０】以上のように構成された電動パワーステア
リング装置では、ＩＰＭモータ１０のロータ１が回転す
ると、ボールネジ８８により回転運動が直線運動に変換
され、ラックバー９３がアシストされる。In the electric power steering apparatus constructed as described above, when the rotor 1 of the IPM motor 10 rotates, the ball screw 88 converts the rotational movement into a linear movement, and the rack bar 93 is assisted.
【００３１】この際、ＩＰＭモータ１０では、各永久磁
石４の第３平面４ａが各磁石穴３の第１平面３ａと必ず
当接し、各永久磁石の第４平面４ｂが各磁石穴３の第２
平面３ｂと必ず当接している。このため、径方向にエア
ギャップが生じない。このため、このＩＰＭモータ１０
では、ステータ８５とロータ１との間に生じる磁気回路
の磁気抵抗が増大することがなく、モータトルクを高く
維持することができる。また、径方向のエアギャップに
ばらつきが生じないので、トルクリップルを小さくでき
る。At this time, in the IPM motor 10, the third flat surface 4a of each permanent magnet 4 is always in contact with the first flat surface 3a of each magnet hole 3, and the fourth flat surface 4b of each permanent magnet is the first flat surface 4b of each magnet hole 3. Two
It is always in contact with the flat surface 3b. Therefore, no air gap is generated in the radial direction. Therefore, this IPM motor 10
Then, the magnetic resistance of the magnetic circuit generated between the stator 85 and the rotor 1 does not increase, and the motor torque can be kept high. Further, since the radial air gap does not vary, the torque ripple can be reduced.
【００３２】また、このＩＰＭモータ１０では、板バネ
５によって、各永久磁石４の第３平面４ａが各磁石穴３
の第１平面３ａと当接し、各永久磁石４の第４平面４ｂ
が各磁石穴３の第２平面３ｂと当接した状態が維持され
るため、動作中において、磁石穴３内で永久磁石４の位
置がずれることがない。そのため、磁気回路の磁気抵抗
の変動を防止することができ、トルクリップルが小さく
なる。In the IPM motor 10, the leaf spring 5 causes the third flat surface 4a of each permanent magnet 4 to move into each magnet hole 3.
Of the permanent magnet 4 and the fourth flat surface 4b of each permanent magnet 4
Is maintained in contact with the second flat surface 3b of each magnet hole 3, so that the position of the permanent magnet 4 does not shift in the magnet hole 3 during operation. Therefore, it is possible to prevent the fluctuation of the magnetic resistance of the magnetic circuit and reduce the torque ripple.
【００３３】したがって、このＩＰＭモータ１０によれ
ば、小型でありながら、高いモータトルクが得られると
ともにトルクリップルを小さくすることができる。この
ため、電動パワーステアリング装置において、優れた車
両搭載性と、優れた操舵アシストとを実現することがで
きる。Therefore, according to the IPM motor 10, a high motor torque can be obtained and a torque ripple can be reduced while being small in size. Therefore, in the electric power steering device, excellent vehicle mountability and excellent steering assist can be realized.
【００３４】また、このＩＰＭモータ１０では、各磁石
穴３は底面の下底ｌ４同士又は上底ｌ３同士が隣り合っ
ている。これにより、ロータ１の回転方向の相違による
磁束密度の差を防止でき、ロータ１が両方向に滑らかに
回転できる。このため、やはり電動パワーステアリング
装置において、優れた操舵アシストを発揮することがで
きる。In the IPM motor 10, the bottoms 14 of the bottoms or the tops 13 of the bottoms of the magnet holes 3 are adjacent to each other. As a result, the difference in magnetic flux density due to the difference in the rotation direction of the rotor 1 can be prevented, and the rotor 1 can smoothly rotate in both directions. Therefore, also in the electric power steering device, excellent steering assist can be exerted.
【００３５】なお、上記実施形態のＩＰＭモータ１０は
固定子に対して可動子が相対回転するものであるが、本
発明は固定子に対して可動子が相対直線運動するＩＰＭ
モータにも具体化可能であることはいうまでもない。In the IPM motor 10 of the above embodiment, the mover rotates relative to the stator, but in the present invention, the IPM in which the mover moves linearly relative to the stator.
It goes without saying that it can be embodied in a motor.
【図１】実施形態のＩＰＭモータに係り、ロータの一部
断面図である。FIG. 1 is a partial cross-sectional view of a rotor according to an IPM motor of an embodiment.
【図２】実施形態のＩＰＭモータに係り、ロータの一部
拡大断面図である。FIG. 2 is a partial enlarged cross-sectional view of a rotor according to the IPM motor of the embodiment.
【図３】実施形態のＩＰＭモータに係り、打抜板の拡大
平面図である。FIG. 3 is an enlarged plan view of a punching plate according to the IPM motor of the embodiment.
【図４】実施形態のＩＰＭモータに係り、電動パワース
テアリング装置の模式図である。FIG. 4 is a schematic diagram of an electric power steering device according to the IPM motor of the embodiment.
【図５】実施形態のＩＰＭモータに係り、電動パワース
テアリング装置の一部拡大断面図である。FIG. 5 is a partially enlarged cross-sectional view of the electric power steering device according to the IPM motor of the embodiment.
【図６】従来のＩＰＭモータの断面図である。FIG. 6 is a sectional view of a conventional IPM motor.
【図７】ＩＰＭモータの電流進み角とトルクとの関係を
表す図である。FIG. 7 is a diagram showing a relationship between a current lead angle and torque of an IPM motor.
【図８】従来のＩＰＭモータのロータの一部断面図であ
る。FIG. 8 is a partial cross-sectional view of a rotor of a conventional IPM motor.
８７…電機子巻線 ８５…固定子（ステータ） Ｇ…間隙 １…可動子（ロータ） ３…磁石穴 ２…可動子本体（ロータ本体） ４…永久磁石 １０…埋込磁石型モータ（ＩＰＭモータ） ３ａ…第１平面 ３ｂ…第２平面 ４ａ…第３平面 ４ｂ…第４平面 Ｌ１…第１頂線 Ｌ２…第２頂線 θ１、θ２…内角 ５…付勢手段（板バネ） ｌ１、ｌ２、ｌ５、ｌ６…脚 ｌ３、ｌ７…上底 ｌ４、ｌ８…下底 87 ... Armature winding 85 ... Stator (stator) G ... Gap 1 ... Mover (rotor) 3 ... Magnet hole 2 ... Mover body (rotor body) 4 ... Permanent magnet 10 ... Embedded magnet type motor (IPM motor) 3a ... 1st plane 3b ... second plane 4a ... 3rd plane 4b ... 4th plane L1 ... First top line L2 ... Second top line θ1, θ2 ... Interior angle 5 ... Biasing means (leaf spring) l1, l2, l5, l6 ... legs l3, l7 ... Upper bottom l4, l8 ... lower bottom
Claims (6)
間に間隙を有して対面し、該固定子に対して相対移動可
能な可動子とを備え、該可動子は、等間隔に複数個の磁
石穴が配置された磁性材料製の可動子本体と、該可動子
本体の各該磁石穴に挿入された永久磁石とを有して構成
された埋込磁石型モータにおいて、 各前記磁石穴は前記間隙側の第１平面と該第１平面に対
面する第２平面とが平行でなく、各前記永久磁石は前記
間隙側に位置される第３平面と該第３平面に対面する第
４平面とが平行でなく、該第１平面と該第２平面とが仮
想的に交差する第１頂線の内角と該第３平面と該第４平
面とが仮想的に交差する第２頂線の内角とは等しく、各
該永久磁石は各該磁石穴内で該第１頂線に該第２頂線が
近づく方向に付勢手段によって付勢されていることを特
徴とする埋込磁石型モータ。1. A stator having an armature winding, and a mover facing with a gap between the stator and movable relative to the stator, the mover comprising: , An embedded magnet type motor having a mover body made of a magnetic material in which a plurality of magnet holes are arranged at equal intervals, and a permanent magnet inserted into each magnet hole of the mover body. In each of the magnet holes, the first plane on the gap side and the second plane facing the first plane are not parallel to each other, and each of the permanent magnets has a third plane and a third plane located on the gap side. The fourth plane facing the plane is not parallel, and the inner angle of the first apex at which the first plane and the second plane virtually intersect, the third plane, and the fourth plane are virtually The inner angle of the intersecting second apex is equal, and each of the permanent magnets is urged by the urging means in a direction in which the second apex approaches the first apex in each magnet hole. Embedded magnet type motor characterized by being
断面視で等脚台形の脚をなし、第３平面と第４平面とも
これらに直交する断面視で等脚台形の脚をなしているこ
とを特徴とする請求項１記載の埋込磁石型モータ。2. The first plane and the second plane form an isosceles trapezoidal leg in a sectional view orthogonal to these, and the third plane and the fourth plane also form an isosceles trapezoidal leg in a sectional view orthogonal to them. The embedded magnet type motor according to claim 1, wherein the embedded magnet type motor is not provided.
り、各永久磁石も底面が等脚台形の四角柱状であること
を特徴とする請求項２記載の埋込磁石型モータ。3. The embedded magnet type motor according to claim 2, wherein each magnet hole has a quadrangular prism shape whose bottom surface is an isosceles trapezoid, and each permanent magnet also has a quadrangular prism shape whose bottom surface is an isosceles trapezoid.
合っていることを特徴とする請求項１、２又は３記載の
埋込磁石型モータ。4. The embedded magnet type motor according to claim 1, wherein the first apex lines of two adjacent magnet holes face each other.
隣り合っていることを特徴とする請求項３記載の埋込磁
石型モータ。5. The embedded magnet type motor according to claim 3, wherein the bottoms of the bottoms or the tops of the bottoms of the magnet holes are adjacent to each other.
請求項１、２、３、４又は５記載の埋込磁石型モータ。6. The embedded magnet type motor according to claim 1, wherein the biasing means is a leaf spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001284641A JP3738718B2 (en) | 2001-09-19 | 2001-09-19 | Embedded magnet type motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001284641A JP3738718B2 (en) | 2001-09-19 | 2001-09-19 | Embedded magnet type motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003092846A true JP2003092846A (en) | 2003-03-28 |
| JP3738718B2 JP3738718B2 (en) | 2006-01-25 |
Family
ID=19107924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001284641A Expired - Fee Related JP3738718B2 (en) | 2001-09-19 | 2001-09-19 | Embedded magnet type motor |
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| Country | Link |
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| JP (1) | JP3738718B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004328963A (en) * | 2003-04-28 | 2004-11-18 | Nissan Motor Co Ltd | Manufacturing method of rotor for electric motor, and the rotor for electric motor |
| WO2009063696A1 (en) * | 2007-11-15 | 2009-05-22 | Mitsubishi Electric Corporation | Permanent magnet type rotating electrical machine and electric power steering device |
| JP2014003785A (en) * | 2012-06-18 | 2014-01-09 | Fuji Electric Co Ltd | Permanent magnet type rotary electrical machine |
| WO2018056318A1 (en) * | 2016-09-21 | 2018-03-29 | アイシン・エィ・ダブリュ株式会社 | Electric motor rotor |
| CN108667174A (en) * | 2017-03-31 | 2018-10-16 | 南京理工大学 | Surface permanent magnetic rotor and motor |
| WO2020218030A1 (en) * | 2019-04-25 | 2020-10-29 | 日立オートモティブシステムズ株式会社 | Rotor for rotating electrical machine and rotating electrical machine |
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| CN106685114A (en) * | 2015-11-09 | 2017-05-17 | 南车株洲电力机车研究所有限公司 | Rotor used for permanent magnet motor |
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2001
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004328963A (en) * | 2003-04-28 | 2004-11-18 | Nissan Motor Co Ltd | Manufacturing method of rotor for electric motor, and the rotor for electric motor |
| EP2211442A4 (en) * | 2007-11-15 | 2017-03-29 | Mitsubishi Electric Corporation | Permanent magnet type rotating electrical machine and electric power steering device |
| EP2211442A1 (en) * | 2007-11-15 | 2010-07-28 | Mitsubishi Electric Corporation | Permanent magnet type rotating electrical machine and electric power steering device |
| JPWO2009063696A1 (en) * | 2007-11-15 | 2011-03-31 | 三菱電機株式会社 | Permanent magnet type rotating electric machine and electric power steering device |
| US8648513B2 (en) | 2007-11-15 | 2014-02-11 | Mitsubishi Electronics Corporation | Permanent magnet type rotating electrical machine and electric power steering device |
| WO2009063696A1 (en) * | 2007-11-15 | 2009-05-22 | Mitsubishi Electric Corporation | Permanent magnet type rotating electrical machine and electric power steering device |
| EP3540915A1 (en) * | 2007-11-15 | 2019-09-18 | Mitsubishi Electric Corporation | Permanent magnet type rotating electrical machine and electric power steering device |
| JP2014003785A (en) * | 2012-06-18 | 2014-01-09 | Fuji Electric Co Ltd | Permanent magnet type rotary electrical machine |
| WO2018056318A1 (en) * | 2016-09-21 | 2018-03-29 | アイシン・エィ・ダブリュ株式会社 | Electric motor rotor |
| CN108667174A (en) * | 2017-03-31 | 2018-10-16 | 南京理工大学 | Surface permanent magnetic rotor and motor |
| WO2020218030A1 (en) * | 2019-04-25 | 2020-10-29 | 日立オートモティブシステムズ株式会社 | Rotor for rotating electrical machine and rotating electrical machine |
| JPWO2020218030A1 (en) * | 2019-04-25 | 2020-10-29 | ||
| JP7177256B2 (en) | 2019-04-25 | 2022-11-22 | 日立Astemo株式会社 | Rotor of rotating electric machine and rotating electric machine |
| US12062947B2 (en) | 2019-04-25 | 2024-08-13 | Hitachi Astemo, Ltd. | Rotor for rotary electric machine and rotary electric machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3738718B2 (en) | 2006-01-25 |
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