JP2000116089A - Permanent magnet motor - Google Patents
Permanent magnet motorInfo
- Publication number
- JP2000116089A JP2000116089A JP27760398A JP27760398A JP2000116089A JP 2000116089 A JP2000116089 A JP 2000116089A JP 27760398 A JP27760398 A JP 27760398A JP 27760398 A JP27760398 A JP 27760398A JP 2000116089 A JP2000116089 A JP 2000116089A
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- cylindrical magnet
- cylindrical
- motor
- 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
Links
Landscapes
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はサーボモータ、スピ
ンドルモータ等の永久磁石モータの改良に係わるもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in permanent magnet motors such as servo motors and spindle motors.
【０００２】[0002]
【従来の技術】フェライトや希土類合金のような結晶磁
気異方性材料を粉砕し、特定の磁場中でプレス成型を行
い作製される異方性磁石は、スピーカ、モータ、計測
器、その他の電気機器等に広く使用されている。このう
ち特にラジアル方向に異方性を有する希土類焼結磁石
は、磁気特性に優れ、軸方向への自由な着磁が可能であ
り、またセグメント磁石のような磁石固定用の補強の必
要もないため、ＡＣサーボモータ、ＤＣブラシレスモー
タ等に使用されている。特に近年はモータの高性能化に
ともない、長尺のラジアル異方性磁石が求められてき
た。ラジアル配向を有する磁石は磁場中成型または後方
押し出しにより製造されるが、磁場中成型法はコアを介
して磁場を対抗方向から印加しラジアル配向を得るがコ
ア形状により配向可能な磁石高さが決まってしまい、長
尺品を製造することが難しい。また、後方押し出し法は
設備が大掛かりで、歩留まりが悪く、安価な磁石を製造
することが困難であった。このようにラジアル異方性磁
石は、いかなる方法においても製造が困難であり、安く
大量に製造することは難しくラジアル異方性磁石を用い
たモータも非常にコストが高くなってしまうという不利
があった。2. Description of the Related Art Anisotropic magnets made by crushing crystalline magnetic anisotropic materials such as ferrites and rare earth alloys and pressing them in a specific magnetic field are used to produce loudspeakers, motors, measuring instruments, and other electric machines. Widely used for equipment and the like. Of these, rare earth sintered magnets that have anisotropy in the radial direction in particular have excellent magnetic properties, can be freely magnetized in the axial direction, and do not require reinforcement for fixing magnets such as segment magnets. Therefore, they are used for AC servomotors, DC brushless motors, and the like. In particular, in recent years, a long radial anisotropic magnet has been demanded as the performance of a motor becomes higher. Magnets with radial orientation are manufactured by molding in a magnetic field or by backward extrusion.In the molding method in a magnetic field, a magnetic field is applied from the opposite direction through a core to obtain radial orientation, but the magnet height that can be oriented is determined by the core shape. It is difficult to manufacture long products. In addition, the backward extrusion method requires large facilities, has a low yield, and it is difficult to manufacture an inexpensive magnet. As described above, it is difficult to manufacture the radial anisotropic magnet by any method, and it is difficult to mass-produce it inexpensively, and there is a disadvantage that the cost of the motor using the radial anisotropic magnet is very high. Was.
【０００３】[0003]
【発明が解決しようとする課題】ラジアル異方性磁石を
用いずとも円筒磁石に多極着磁が行え、磁束密度が高
く、かつ極間における磁束密度のばらつきが小さけれ
ば、高性能の永久磁石モータ用の磁石となりうる。磁石
を垂直磁場プレスにより円筒軸垂直の一方向に配向して
おき、着磁のみを多極にすることによりラジアル異方性
磁石を用いずに永久磁石モータ用円筒多極磁石を作製す
る方法が提案された（電気学会マグネティクス研究会資
料ＭＡＧ−８５−１２０，１９８５）。垂直磁場成型に
より製造された、円筒軸垂直の一方向に配向した円筒磁
石（以下、径方向配向円筒磁石と呼ぶ）はプレス機のキ
ャビティが許すかぎりの長尺化（５０ｍｍ以上）に加え
て多連プレスが行えるので、１度のプレスで多数個の成
型体が得られ、高価なラジアル異方性磁石の代わりに廉
価にモータ用円筒磁石を供給することができる。しか
し、実際に垂直磁場プレスにより作製された径方向配向
円筒磁石に多極着磁を行った磁石は配向方向近傍の極で
は磁束密度が高く、配向方向に垂直な極では磁束密度が
小さいため、モータに組みモータを回転させると極間の
磁束密度のばらつきを反映したトルクむらが生じてしま
い、実用に耐えうるモータ用磁石とは言えなかった。If a cylindrical magnet can be multipolar magnetized without using a radial anisotropic magnet, the magnetic flux density is high, and the variation in magnetic flux density between the poles is small, a high-performance permanent magnet can be used. It can be a magnet for a motor. A method of manufacturing a cylindrical multipole magnet for a permanent magnet motor without using a radial anisotropic magnet by orienting the magnet in one direction perpendicular to the cylindrical axis by a vertical magnetic field press and making only the magnetization multipole. Proposed (MAG-85-120, 1985). Cylindrical magnets manufactured by vertical magnetic field molding and oriented in one direction perpendicular to the cylinder axis (hereinafter referred to as radially-oriented cylindrical magnets) are as long as the cavity of the press machine allows (in addition to 50 mm or more), in addition to many. Since continuous pressing can be performed, a large number of molded bodies can be obtained by one press, and a cylindrical magnet for a motor can be supplied at a low cost instead of an expensive radial anisotropic magnet. However, magnets that are multipole magnetized on a radially oriented cylindrical magnet actually produced by a vertical magnetic field press have a high magnetic flux density at poles near the orientation direction and a low magnetic flux density at poles perpendicular to the orientation direction. When the motor is assembled with the motor and the motor is rotated, uneven torque reflecting the variation in the magnetic flux density between the poles occurs, and it cannot be said that the magnet is a motor magnet that can withstand practical use.
【０００４】[0004]
【課題を解決するための手段】本発明者らはかかる課題
を解決するために鋭意努力を重ねた結果、本発明に至っ
たもので、本発明の永久磁石モータは、（１）垂直磁場
成型法によって作製された、円筒軸に垂直な一方向に配
向された円筒磁石における周方向の着磁極数が２ｎ（ｎ
は１より大きく５０より小さい正の整数）個のとき、こ
の円筒磁石と組み合わせるステータの歯数が３ｋ（ｋは
１より大きく３３より小さい正の整数）個であり、かつ
２ｎ≠３ｋであることを特徴としている、（２）円筒軸
に垂直な一方向に配向した円筒磁石のスキュー角度は円
筒磁石一極分の１／１０から２／３で、２ｎ（ｎは１よ
り大きく５０より小さい正の整数）個の多極スキュー着
磁からなっている、（３）ステータ歯のスキュー角度は
円筒磁石一極分の角度の１／１０から２／３で、３ｋ
（ｋは１より大きく３３より小さい正の整数）個のスキ
ュー歯を有している。本発明により、高性能の同期式磁
石モータを低コストで大量に供給することができる。Means for Solving the Problems The present inventors have made intensive efforts to solve the above problems, and as a result, the present invention has been achieved. The permanent magnet motor of the present invention has the following features. The number of magnetic poles in the circumferential direction of a cylindrical magnet manufactured by the method and oriented in one direction perpendicular to the cylindrical axis is 2n (n
Is greater than 1 and less than 50), the number of teeth of the stator combined with the cylindrical magnet is 3k (k is a positive integer greater than 1 and less than 33), and 2n ≠ 3k (2) The skew angle of a cylindrical magnet oriented in one direction perpendicular to the cylindrical axis is 1/10 to 2/3 of one pole of the cylindrical magnet, and 2n (n is larger than 1 and smaller than 50 (3) The skew angle of the stator teeth is 1/10 to 2/3 of the angle of one pole of the cylindrical magnet, and is 3k.
(K is a positive integer greater than 1 and less than 33) skew teeth. According to the present invention, a high-performance synchronous magnet motor can be supplied in large quantities at low cost.
【０００５】[0005]
【発明の実施の形態】本発明の作用を、ＮｄＦｅＢ磁石
の径方向配向円筒磁石について以下に説明するが、本発
明はＮｄＦｅＢ磁石に限るものではない。図１は、垂直
磁場プレスで作製したＮｄ系円筒磁石を、６極着磁した
時の表面磁束密度の測定結果である。このように径方向
配向させた円筒磁石を６極着磁すると、配向方向のＢ、
Ｃ、Ｅ、Ｆ極では大きな表面磁束が得られるが、配向に
垂直な方向のＡ、Ｄ極表面付近では磁束密度が小さくな
る。したがって、各極から得られる総磁束量も極間でバ
ラツキが生じ、モータに組み込まれたときには、回転む
らや振動、騒音の原因となりうる。そこで本発明におい
ては、径方向に配向した円筒磁石の多極着磁極数を２ｎ
（ｎは１から５０までの正の整数）としたときに、これ
と組み合わせるステータの歯数を３ｋ（ｋは１より大き
くて３３より小さい正の整数）とし、かつまた２ｎ≠３
ｋにすることによって、配向方向の磁束密度が高い磁石
極と、配向方向ではなくて磁束密度の低い極とが同一位
相において互いに組み合わされ、その結果トータルの磁
束量は平均化され、モータトルクも平均化されることに
なる。したがって、このような組み合わせで作られたモ
ータのトルクリップルは小さく、安価な磁石を用いて高
性能な同期式磁石モータを製造することができる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The operation of the present invention will be described below for a radially oriented cylindrical magnet of an NdFeB magnet, but the present invention is not limited to an NdFeB magnet. FIG. 1 shows a measurement result of the surface magnetic flux density when a Nd-based cylindrical magnet produced by a vertical magnetic field press is magnetized in six poles. When the cylindrical magnet thus radially oriented is magnetized in six poles, B in the orientation direction,
A large surface magnetic flux is obtained at the C, E, and F poles, but the magnetic flux density becomes small near the A and D pole surfaces in a direction perpendicular to the orientation. Therefore, the total amount of magnetic flux obtained from each pole also varies between the poles, and when incorporated into a motor, may cause uneven rotation, vibration, and noise. Therefore, in the present invention, the number of multipolar magnetized poles of the cylindrical magnet oriented in the radial direction is 2n.
When (n is a positive integer from 1 to 50), the number of stator teeth to be combined with this is 3k (k is a positive integer greater than 1 and less than 33), and 2n ≠ 3
By setting k, the magnet pole having a high magnetic flux density in the orientation direction and the pole having a low magnetic flux density instead of the orientation direction are combined with each other in the same phase. As a result, the total magnetic flux amount is averaged, and the motor torque is also reduced. It will be averaged. Therefore, the torque ripple of the motor made by such a combination is small, and a high-performance synchronous magnet motor can be manufactured using inexpensive magnets.
【０００６】さらに、この円筒磁石にスキュー着磁を円
筒磁石一極分の角度の１／１０から２／３で行うか、ス
テータ極の形状を円筒磁石一極分の角度の１／１０から
２／３の角度でスキューするかによって、コギングトル
クを小さくすることができる。円筒磁石及びステータ歯
のスキュー角度が、円筒磁石１極分の角度の１／１０未
満であるとスキュー着磁によるコギングトルク低下の効
果が小さく、円筒磁石１極分の角度の２／３より大きい
とモータのトルクの低下が大きくなるため、スキュー角
度は円筒磁石１極分の角度の１／１０から２／３の角度
が好ましい。Further, the skew magnetization of the cylindrical magnet is performed at 1/10 to 2/3 of the angle of one pole of the cylindrical magnet, or the shape of the stator pole is changed to 1/10 to 2/3 of the angle of one pole of the cylindrical magnet. The cogging torque can be reduced depending on whether the skew is performed at an angle of ３. If the skew angle of the cylindrical magnet and the stator teeth is less than 1/10 of the angle of one pole of the cylindrical magnet, the effect of lowering the cogging torque due to the skew magnetization is small, and is larger than two thirds of the angle of one pole of the cylindrical magnet. Therefore, the skew angle is preferably 1/10 to 2/3 of the angle of one pole of the cylindrical magnet.
【０００７】[0007]
【実施例】（実施例１）それぞれ純度９９．７重量％の
Ｎｄ、Ｄｙ、Ｆｅ、Ｃｏ、Ｍ（ＭはＡｌ、Ｓｉ、Ｃｕ）
と純度９９．５重量％のＢを用い、真空溶解炉で溶解鋳
造してインゴットを作製した。このインゴットをジョウ
クラッシャーで粗粉砕し、更に窒素気流中ジェットミル
粉砕により平均粒径３．５μｍの微粉末を得た。この粉
末を垂直磁場プレスにて１２ｋＯｅの磁場中において
１．０ｔ／ｃｍ2 の成型圧にて成型した。この成型体は
Ａｒガス中１０９０℃で１時間焼結を行い、引き続き５
８０℃で１時間の熱処理を行った。その後加工を行いφ
３０ｍｍ×φ２５ｍｍ×Ｌ３０ｍｍの円筒磁石を得た。
本円筒磁石と同一磁石粉を用い、垂直磁場プレスにて１
２ｋＯｅの磁場中において１．０ｔ／ｃｍ2 の成型圧に
て成型し、Ａｒガス中１０９０℃で１時間焼結を行い、
引き続き５８０℃で１時間の熱処理をして本円筒磁石と
同一条件で作製したブロック磁石の特性は、Ｂｒ：１
３．０ｋＧ、ｉＨｃ：１５ｋＯｅ、（ＢＨ）ｍａｘ：４
０ＭＧＯｅであった。上記の径方向配向円筒磁石に１０
極に多極着磁を行った。図２に示されるようにこの１０
極着磁磁石１をステータの歯２の数１２、コイル３の巻
数１００のモータに組み込んだ。このモータのＵ−Ｖ、
Ｖ−Ｗ、Ｗ−Ｕの各相間の磁束量をフラックスメータを
用いて測定した。結果を表１に示す。表より各極の磁束
量はほぼ等しく、磁石の極ごとの磁束量のばらつきはモ
ータにすることで十分緩和されることがわかる。またこ
のモータを１０００ｒｐｍで回転させた際の誘起電圧及
び、同モータを１〜５ｒｐｍで回転させた際の荷重計に
よるトルクリップルの大きさを測定した。表２に誘起電
圧の絶対値の最大及びトルクリップルの最大最小の差を
示す。この表から、本モータは使用上十分な誘起電圧量
を有し、十分小さなトルクリップルであることがわか
る。EXAMPLES (Example 1) Nd, Dy, Fe, Co, M (M is Al, Si, Cu) each having a purity of 99.7% by weight.
And B having a purity of 99.5% by weight was melt-cast in a vacuum melting furnace to prepare an ingot. The ingot was coarsely pulverized with a jaw crusher, and further subjected to jet mill pulverization in a nitrogen stream to obtain a fine powder having an average particle size of 3.5 μm. This powder was molded with a vertical magnetic field press at a molding pressure of 1.0 t / cm 2 in a magnetic field of 12 kOe. This molded body was sintered at 1090 ° C. for 1 hour in Ar gas,
Heat treatment was performed at 80 ° C. for 1 hour. After that, processing
A cylindrical magnet of 30 mm × φ25 mm × L30 mm was obtained.
Using the same magnet powder as this cylindrical magnet,
Molding was performed at a molding pressure of 1.0 t / cm 2 in a magnetic field of 2 kOe, and sintering was performed at 1090 ° C. for 1 hour in Ar gas.
Subsequently, the properties of the block magnet produced by performing a heat treatment at 580 ° C. for 1 hour under the same conditions as those of the cylindrical magnet were as follows: Br: 1
3.0 kG, iHc: 15 kOe, (BH) max: 4
It was 0MGOe. 10 to the above radially oriented cylindrical magnet
The poles were multipolar magnetized. As shown in FIG.
The pole magnetized magnet 1 was incorporated into a motor having 12 stator teeth 2 and 100 coils 3. UV of this motor,
The amount of magnetic flux between the VW and WU phases was measured using a flux meter. Table 1 shows the results. From the table, it can be seen that the magnetic flux amount of each pole is almost equal, and the variation of the magnetic flux amount for each pole of the magnet is sufficiently mitigated by using a motor. In addition, the induced voltage when this motor was rotated at 1000 rpm and the magnitude of the torque ripple by a load meter when the motor was rotated at 1 to 5 rpm were measured. Table 2 shows the difference between the maximum value of the absolute value of the induced voltage and the maximum value and the minimum value of the torque ripple. From this table, it can be seen that this motor has a sufficient amount of induced voltage in use and has sufficiently small torque ripple.
【０００８】（実施例２）実施例１の径方向配向円筒磁
石を着磁する際、スキュー角度を磁石１極分の角度の１
／３の１２度でスキュー着磁を行い、該磁石を実施例１
のモータに組み込み、実施例１と同様に誘起電圧および
トルクリップルを測定した値を表２に示す。表よりトル
クリップルの量がスキュー無し品よりさらに小さく、誘
起電圧の低下はわずかであり、実用に適しているのがわ
かる。(Embodiment 2) When magnetizing the radially oriented cylindrical magnet of Embodiment 1, the skew angle is set to one angle of one pole of the magnet.
Skew magnetization at 12 degrees of
Table 2 shows the values obtained by measuring the induced voltage and the torque ripple in the same manner as in Example 1 by assembling the motor. From the table, it can be seen that the amount of torque ripple is smaller than that of the product without skew, and the induced voltage is slightly reduced, which is suitable for practical use.
【０００９】（実施例３）径方向配向円筒磁石を実施例
１と同様に着磁し、スキュー角度が磁石１極分の角度の
１／３の１２度であるステータ歯を持つ、実施例１と同
寸法のモータに組み込み、実施例２と同様に誘起電圧お
よびトルクリップルを測定した値を表２に示す。表より
トルクリップルの量がスキュー無し品よりさらに小さ
く、誘起電圧の低下はわずかであり、実用に適するのが
わかる。(Embodiment 3) A first embodiment in which a radially oriented cylindrical magnet is magnetized in the same manner as in Embodiment 1 and has a stator tooth with a skew angle of 12 degrees which is 1/3 of the angle of one magnet. Table 2 shows the values obtained by measuring the induced voltage and the torque ripple in the same manner as in Example 2 by incorporating the motor into the motor having the same dimensions as in Example 1. From the table, it can be seen that the amount of torque ripple is even smaller than that of the product without skew, and the induced voltage is slightly reduced, which is suitable for practical use.
【００１０】（比較例１）実施例１の径方向配向円筒磁
石を着磁する際、スキュー角度を磁石１極分の角度の５
／６の３０度でスキュー着磁を行い、該磁石を実施例１
のモータに組み込み実施例２と同様に誘起電圧およびト
ルクリップルを測定した値を表２に示す。表よりトルク
リップルの量はスキュー無し品より小さいが、誘起電圧
の低下が大きく実用に適さないのがわかる。(Comparative Example 1) When the radially oriented cylindrical magnet of Example 1 was magnetized, the skew angle was 5 times the angle of one pole of the magnet.
Skew magnetization at 30 degrees of / 6
Table 2 shows values obtained by measuring the induced voltage and the torque ripple in the same manner as in Example 2 by assembling the motor. From the table, it can be seen that although the amount of torque ripple is smaller than that of the non-skewed product, the induced voltage is so large that it is not suitable for practical use.
【００１１】[0011]
【表１】 [Table 1]
【表２】 [Table 2]
【００１２】[0012]
【発明の効果】本発明によれば、生産性が低く高価なラ
ジアル異方性磁石を用いずに、多連、長尺品が容易に生
産可能で、安価で大量に安定して供給できる垂直磁場プ
レスによる径方向配向円筒磁石を用いて高性能の永久磁
石モータを実現することができ、ＡＣサーボモータ、Ｄ
Ｃブラシレスモータ等の高性能モータの低価格化に有用
であり、産業上その利用価値は極めて高い。According to the present invention, a multi-unit, long product can be easily produced without using a radially anisotropic magnet which is low in productivity and can be supplied stably at low cost and in large quantities. A high-performance permanent magnet motor can be realized using a radially oriented cylindrical magnet by a magnetic field press.
It is useful for lowering the price of high-performance motors such as C brushless motors, and has a very high industrial utility value.
【図１】垂直磁場プレスにより作製したＮｄ−Ｆｅ−Ｂ
系円筒磁石に６極着磁を行った際の表面磁束密度を示し
た図である。FIG. 1 Nd—Fe—B produced by a vertical magnetic field press
FIG. 6 is a diagram showing a surface magnetic flux density when a six-pole magnetization is performed on a system cylindrical magnet.
【図２】１０極に多極着磁した円筒磁石と１２個のステ
ータ歯を組み合わせた３相モータの平面図を示したもの
である。FIG. 2 is a plan view of a three-phase motor in which a cylindrical magnet multipolarized to 10 poles and 12 stator teeth are combined.
１．径方向配向円筒磁石 ２．モータステータ歯 ３．モータコイル 1. 1. Radially oriented cylindrical magnet 2. motor stator teeth Motor coil
Claims (3)
筒軸に垂直な一方向に配向された円筒磁石における周方
向の着磁極数が２ｎ（ｎは１より大きく５０より小さい
正の整数）個のとき、この円筒磁石と組み合わせるステ
ータの歯数が３ｋ（ｋは１より大きく３３より小さい正
の整数）個であり、かつ２ｎ≠３ｋであることを特徴と
する周方向に多極に着磁した永久磁石モータ。1. The number of magnetic poles in the circumferential direction of a cylindrical magnet oriented in one direction perpendicular to a cylindrical axis and produced by a perpendicular magnetic field molding method is 2n (n is a positive integer greater than 1 and less than 50). Wherein the number of teeth of the stator combined with the cylindrical magnet is 3k (k is a positive integer greater than 1 and less than 33) and 2n ≠ 3k, and the stator is magnetized in a multipolar manner in the circumferential direction. Permanent magnet motor.
石のスキュー角度が円筒磁石一極分の１／１０から２／
３で、２ｎ（ｎは１より大きく５０より小さい正の整
数）個の多極スキュー着磁であることを特徴とする請求
項１記載の永久磁石モータ。2. The skew angle of a cylindrical magnet oriented in one direction perpendicular to the cylindrical axis is from 1/10 to 2 / of one pole of the cylindrical magnet.
3. The permanent magnet motor according to claim 1, wherein the number of the multi-pole skew is 2n (n is a positive integer greater than 1 and less than 50).
極分の角度の１／１０から２／３で、３ｋ（ｋは１より
大きく３３より小さい正の整数）個のスキュー歯をもつ
ことを特徴とする請求項１記載の永久磁石モータ。3. The skew angle of the stator teeth is 1/10 to 2/3 of the angle of one pole of the cylindrical magnet, and 3k (k is a positive integer larger than 1 and smaller than 33) skew teeth. The permanent magnet motor according to claim 1, wherein:
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27760398A JP2000116089A (en) | 1998-09-30 | 1998-09-30 | Permanent magnet motor |
| EP99402202A EP0996216B1 (en) | 1998-09-30 | 1999-09-07 | Permanent magnet motor and rotor thereof |
| DE69914850T DE69914850T2 (en) | 1998-09-30 | 1999-09-07 | Permanent magnet motor and its rotor |
| US09/396,420 US6262507B1 (en) | 1998-09-30 | 1999-09-15 | Permanent magnet motor and rotor thereof |
| US09/826,825 US6633100B2 (en) | 1998-09-30 | 2001-04-06 | Permanent magnet motor and rotor thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27760398A JP2000116089A (en) | 1998-09-30 | 1998-09-30 | Permanent magnet motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000116089A true JP2000116089A (en) | 2000-04-21 |
Family
ID=17585739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27760398A Pending JP2000116089A (en) | 1998-09-30 | 1998-09-30 | Permanent magnet motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000116089A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1308970A2 (en) * | 2001-10-31 | 2003-05-07 | Shin-Etsu Chemical Co., Ltd. | Radial anisotropic sintered magnet and its production method, magnet rotor using sintered magnet, and motor using magnet rotor |
| US20190245406A1 (en) * | 2018-02-08 | 2019-08-08 | Sunonwealth Electric Machine Industry Co., Ltd. | Stator of a Waterproof Motor and Method for Manufacturing the Same |
-
1998
- 1998-09-30 JP JP27760398A patent/JP2000116089A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1308970A2 (en) * | 2001-10-31 | 2003-05-07 | Shin-Etsu Chemical Co., Ltd. | Radial anisotropic sintered magnet and its production method, magnet rotor using sintered magnet, and motor using magnet rotor |
| KR20030035852A (en) * | 2001-10-31 | 2003-05-09 | 신에쓰 가가꾸 고교 가부시끼가이샤 | Radial Anisotropic Sintered Magnet and Its Preparation Process, and Magnet Rotor and Motor |
| EP1308970A3 (en) * | 2001-10-31 | 2004-12-29 | Shin-Etsu Chemical Co., Ltd. | Radial anisotropic sintered magnet and its production method, magnet rotor using sintered magnet, and motor using magnet rotor |
| US6984270B2 (en) | 2001-10-31 | 2006-01-10 | Shin-Etsu Chemical Co., Ltd. | Radial anisotropic sintered magnet and its production method, magnet rotor using sintered magnet, and motor using magnet rotor |
| EP2063439A1 (en) | 2001-10-31 | 2009-05-27 | Shin-Etsu Chemical Co., Ltd. | Radial anisotropic sintered magnet, its production method, and magnet rotor or motor using said sintered magnet |
| EP2063438A1 (en) | 2001-10-31 | 2009-05-27 | Shin-Etsu Chemical Co., Ltd. | Production method of a radial anisotropic sintered magnet, and magnet rotor or motor using said sintered magnet |
| US7618496B2 (en) | 2001-10-31 | 2009-11-17 | Shin-Etsu Chemical Co., Ltd. | Radial anisotropic sintered magnet and its production method, magnet rotor using sintered magnet, and motor using magnet rotor |
| US7948135B2 (en) | 2001-10-31 | 2011-05-24 | Shin-Etsu Chemical Co., Ltd. | Radial anisotropic sintered magnet and its production method, magnet rotor using sintered magnet, and motor using magnet rotor |
| US20190245406A1 (en) * | 2018-02-08 | 2019-08-08 | Sunonwealth Electric Machine Industry Co., Ltd. | Stator of a Waterproof Motor and Method for Manufacturing the Same |
| US11043871B2 (en) * | 2018-02-08 | 2021-06-22 | Sunonwealth Electric Machine Industry Co., Ltd. | Stator of a waterproof motor and method for manufacturing the same |
| US11387703B2 (en) | 2018-02-08 | 2022-07-12 | Sunonwealth Electric Machine Industry Co., Ltd. | Stator of a waterproof motor and method for manufacturing the same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7618496B2 (en) | Radial anisotropic sintered magnet and its production method, magnet rotor using sintered magnet, and motor using magnet rotor | |
| KR101402451B1 (en) | Permanent magnet and permanent magnet rotating machine | |
| JP4650643B2 (en) | Manufacturing method of radial anisotropic ring magnet | |
| US6262507B1 (en) | Permanent magnet motor and rotor thereof | |
| JP5089979B2 (en) | Radial anisotropic cylindrical sintered magnet, manufacturing method thereof, and permanent magnet motor | |
| JPWO2005124800A1 (en) | Manufacturing method of radial anisotropic cylindrical sintered magnet and cylindrical multipolar magnet for permanent magnet motor | |
| JP4133686B2 (en) | Radial anisotropic ring magnet and manufacturing method thereof | |
| JP4238971B2 (en) | Manufacturing method of radial anisotropic sintered magnet | |
| JP4890620B2 (en) | Mold, magnetic field molding machine, and method for manufacturing permanent magnet | |
| JP3683442B2 (en) | Multistage long multipole magnetized cylindrical magnet rotor and permanent magnet motor | |
| JP5353976B2 (en) | Radial anisotropic sintered magnet and magnet rotor | |
| JP4471698B2 (en) | Mold, permanent magnet magnetic field molding machine, and method for manufacturing permanent magnet | |
| JP2000116089A (en) | Permanent magnet motor | |
| JP2000116090A (en) | Permanent magnet motor | |
| JP5448314B2 (en) | Permanent magnet and permanent magnet rotating machine | |
| JP2000175384A (en) | Permanent magnet motor | |
| KR20070023644A (en) | Methods of producing radial anisotropic cylinder sintered magnet and permanet magnet motor-use cylinder multi-pole magnet | |
| KR101123169B1 (en) | Radial anisotropic cylindrical sintered magnet and permanent magnet motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20040202 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20040726 |