JPH02202329A - Ac motor - Google Patents
Ac motorInfo
- Publication number
- JPH02202329A JPH02202329A JP1018399A JP1839989A JPH02202329A JP H02202329 A JPH02202329 A JP H02202329A JP 1018399 A JP1018399 A JP 1018399A JP 1839989 A JP1839989 A JP 1839989A JP H02202329 A JPH02202329 A JP H02202329A
- Authority
- JP
- Japan
- Prior art keywords
- length
- magnet
- magnetic poles
- motor
- gap
- 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
- 239000011295 pitch Substances 0.000 description 10
- 230000004907 flux Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000005094 computer simulation Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明は、多数の磁極を備えるステータと多数の永久磁
石を備えるロータとを有する交流モータに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an AC motor having a stator with a large number of magnetic poles and a rotor with a large number of permanent magnets.
［従来の技術］
上記交流モータでは、回転時の磁極と永久磁石との位置
関係により、コイル電流とは無関係に出力トルクが変動
し、いわゆるコギングトルクが発生する。従来より、こ
のコギングトルクを低減し、交流モータの回転をスムー
ズにするために、様々な提案がなされている。品も単純
には、磁極と磁石との間の距離（ギャップ）を大きくす
れはよいのであるが、これではモータの出力トルクが低
下し、効率が悪くなる。それに対し、例えば特開昭５９
−１７１４３４８号公報では、多極着磁磁石の磁極の厚
みを周方向で変えることにより、コギングトルクを理論
的にゼロにすることができると述べている。[Prior Art] In the AC motor described above, the output torque fluctuates regardless of the coil current due to the positional relationship between the magnetic poles and the permanent magnets during rotation, and so-called cogging torque occurs. Conventionally, various proposals have been made to reduce this cogging torque and smoothen the rotation of the AC motor. Simply increasing the distance (gap) between the magnetic poles and the magnet would be a good idea, but this would reduce the output torque of the motor and reduce efficiency. On the other hand, for example,
Publication No. 1714348 states that the cogging torque can be theoretically reduced to zero by changing the thickness of the magnetic poles of a multipolar magnetized magnet in the circumferential direction.
ただし、この場合の磁石は１つの円環状連続体である。However, the magnet in this case is one annular continuous body.
特開昭［３２−１０４４５９号では四角形の磁石の角を
削って六角形にして、コギングトルクを低減しようとし
ている。In Japanese Patent Application Laid-Open No. 32-104459, the corners of a square magnet are cut into hexagons in order to reduce cogging torque.
なお、従来、永久磁石はフェライト磁石が一般的であっ
たが、近年、フェライトよりも更に磁気特性の優れた、
すなわち残留磁束密度および保持力の大きい、希土類磁
石が用いられつつある。In the past, ferrite magnets were commonly used as permanent magnets, but in recent years, magnets with even better magnetic properties than ferrite have been used.
That is, rare earth magnets with high residual magnetic flux density and high coercive force are being used.
［発明が解決しようとする課題］
磁石の形状によりコギングトルクを低減する場合には、
磁石をそのような形状に加工することが必要となる。し
かし、フェライト磁石や上記希土類磁石は加工が困難な
ことが多く、成形加工のコストアップ要因となる。また
、たとえ加工ができたとしても、最適な磁石形状は、磁
極ピッチ、磁極間ギャップ、磁極−磁石間のギャップ等
の大きさにより異なってくるため、それらの異なるモー
タを設計する度に最適形状を設計し直さなければならな
いという面倒さもある。さらに、磁石の角を削る等の手
段は、部分的に磁石と磁極との距離を大きくすることに
他ならず、多少の出力トルクの低下が避けられない。[Problem to be solved by the invention] When reducing cogging torque by changing the shape of the magnet,
It is necessary to process the magnet into such a shape. However, ferrite magnets and the above-mentioned rare earth magnets are often difficult to process, which increases the cost of molding. Furthermore, even if machining is possible, the optimal magnet shape will differ depending on the size of the magnetic pole pitch, the gap between magnetic poles, the gap between magnetic poles and magnets, etc., so each time a motor with these different shapes is designed, the optimal shape There is also the hassle of having to redesign the system. Furthermore, measures such as cutting the corners of the magnets only partially increase the distance between the magnets and the magnetic poles, which inevitably results in some reduction in the output torque.
上記２つの従来技術は共に、磁極−磁石間のギヤ・ンブ
を変えてコギングトルクを小さくしようとするものであ
り、そのために、■成形加工に伴うコストアップ、■出
力トルクの低下、という問題があった。Both of the above two conventional technologies attempt to reduce the cogging torque by changing the gear/movement between the magnetic poles and the magnet, and as a result, there are problems such as: (1) increased cost due to molding process, (2) decreased output torque. there were.
本発明は、磁極−磁石間ギャップを均一とするシンプル
な形状をとることにより、出力トルクの低下を防止する
と共に、成形を容易にして加工のコストを低くした上で
、最適な寸法を選ぶことにより、コギングトルクを大幅
に小さくする（ゼロにする）ことを可能にする。すなわ
ち、本発明は、モータの出力トルクをできるだけ大きく
してモータの効率を良好なものとしつつ、そのための磁
石形状の設計・製造の面倒さをなくして、様々な磁極ピ
・ソチ、磁極間ギヤ・ンプ、磁極−磁石間のギャップの
大きさに対して一般的にコギングトルクをほぼゼロとす
る交流モータを提供するものである。The present invention prevents a decrease in output torque by adopting a simple shape with a uniform gap between the magnetic poles and magnets, and also makes it easy to form and reduce processing costs, and allows selection of optimal dimensions. This makes it possible to significantly reduce cogging torque (to zero). That is, the present invention improves motor efficiency by increasing the output torque of the motor as much as possible, and eliminates the trouble of designing and manufacturing the magnet shape for this purpose. - Provides an AC motor in which the cogging torque is generally approximately zero for the size of the gap between the pump and the magnetic poles and the magnet.
［課題を解決するための手段］
上記課題を解決する本発明では、隣接８！Ｌ極間に長さ
ｇｐの空隙（ギャップ）を設けて円周上に一定のピッチ
ｐｐで配列された複数の磁極を有するステータと、その
磁極に対して径方向に長さｇの空隙（ギヤ・ンプ）を設
けて円周上に配列された多数の永久磁石を有するロータ
とを備える交流モータにおいて、各永久磁石の円周方向
の長さＬを、Ｌ＝ｎ４Ｐρ＋ａ◆ｇ＋ｂ舎ｇｐ＋ｃ◆Ｐ
ｐ （１）で定め、ここで、ｎを任意の整数に、
ａを０．４〜０．６に、ｂを０．３〜０．５に、 Ｃを
−０，０６〜−０，０４にすることを特徴とする。[Means for Solving the Problems] In the present invention that solves the above problems, adjacent 8! A stator has a plurality of magnetic poles arranged at a constant pitch pp on the circumference with a gap of length gp between the L poles, and a gap (gap) of length g in the radial direction with respect to the magnetic poles.・In an AC motor equipped with a rotor having a large number of permanent magnets arranged on the circumference, the length L in the circumferential direction of each permanent magnet is L=n4Pρ+a◆g+bgp+c◆P
p (1), where n is an arbitrary integer,
It is characterized in that a is set to 0.4 to 0.6, b is set to 0.3 to 0.5, and C is set to -0.06 to -0.04.
［作用コ
本来円形であるモータのステータ１２とロータ１へとを
直線状に展開して示した第１図の模式図により説明する
。ステータ１２には多数の磁極１６が等ピッチＰｐで並
び、各磁極１６の支柱部分１６ａにはコイルが巻かれ、
先端部分１６ｂは支柱部分１６ａよりも幅広くされてい
る。隣接する磁極先端部分１６ｂ間のギャップの長さは
ｇｐである。ロータ１４には長さしの磁石２０が多数、
等ピッチで並ぶが、第１図にはそのうちの１個のみを示
した。磁極先端部分１６ｂと磁石２０との間のギヤ・ン
プの長さはｇである。[The operation will be explained with reference to the schematic diagram of FIG. 1, which shows the stator 12 and rotor 1 of the motor, which are originally circular, developed in a straight line. A large number of magnetic poles 16 are arranged in the stator 12 at an equal pitch Pp, and a coil is wound around the support portion 16a of each magnetic pole 16.
The tip portion 16b is wider than the support portion 16a. The length of the gap between adjacent magnetic pole tip portions 16b is gp. The rotor 14 has many long magnets 20,
Although they are arranged at equal pitches, only one of them is shown in Figure 1. The length of the gear pump between the pole tip portion 16b and the magnet 20 is g.
ここで、この磁石２０の長さしを単純に磁極ビ・ンチＰ
ｐの整数倍（Ｌ＝ｎ−Ｐｐ）とすると、磁石２０に対向
する磁極間ギャップの長さ（ｇｐ）の総和は、磁石２０
の位置にかかわらず、常に一定となる。このため、磁極
先端１６ｂと磁石２０間の磁束の流れが、厳密にモータ
の径方向（第１図では上下方向）のみであれは、この状
態（すなわち、Ｌ＝ｎ＊Ｐρ）ではコギングトルクは生
じない。しかし、実際には、第２図のコンピュータシミ
ュレーション結果に示されるように、磁極先端１６ｂの
角の部分や磁石２０の角の部分で磁束は径方向から外れ
、回転方向（第１．２図では左右方向）の成分を有する
ようになる。このような場合には、コギングトルクを最
小とする磁石２０の長さしは、Ｆ１１極ピッチｐｐの整
数倍からずれ、それに付加長さＬαを加えた値となる。Here, the length of this magnet 20 is simply calculated by the magnetic pole bit P.
If p is an integer multiple (L=n-Pp), the total length (gp) of the gap between the magnetic poles facing the magnet 20 is
is always constant regardless of its position. Therefore, if the flow of magnetic flux between the magnetic pole tip 16b and the magnet 20 is strictly only in the radial direction of the motor (in the vertical direction in FIG. 1), the cogging torque will not be Does not occur. However, in reality, as shown in the computer simulation results in Figure 2, the magnetic flux deviates from the radial direction at the corner of the magnetic pole tip 16b and the corner of the magnet 20, and the magnetic flux deviates from the radial direction (in Figure 1.2). It has a component in the horizontal direction). In such a case, the length of the magnet 20 that minimizes the cogging torque deviates from an integral multiple of the F11 pole pitch pp, and becomes a value obtained by adding the additional length Lα to the length.
本発明は、この付加長さを
Ｌα＝ａ◆ｇ＋ｂ−ｇｐ＋ｃ−Ｐｐ （Ｌり
と、磁極−磁石間ギャップ長さｇ、磁極間ギャップ長さ
ｇｐ、それに磁極ピッチＰｐの関数として定め、各々の
パラメータの係数ａＳｂ、 ｃを前記範囲内にしたも
のである。このように定めた理由は次の通りである。In the present invention, this additional length is determined as a function of Lα=a◆g+b−gp+c−Pp (L), the magnetic pole-magnet gap length g, the magnetic pole gap length gp, and the magnetic pole pitch Pp, and each The parameter coefficients aSb and c are set within the above range.The reason for setting them in this way is as follows.
第１図のような配置の下で磁石２０の長さしを種々に変
化させ、各長さの場合について第２図のような磁場解析
（第２図中、多数の曲線は磁束を衷す）を行って、コギ
ングトルク（ここでは、ロータ１４の最大推力）がどの
ようになるかを計算した。Under the arrangement shown in Fig. 1, the length of the magnet 20 is varied, and magnetic field analysis is performed for each length as shown in Fig. 2 (in Fig. 2, many curves indicate magnetic flux ) to calculate the cogging torque (in this case, the maximum thrust of the rotor 14).
その結果、第３図に示す通り、磁石長さＬに対してコギ
ングトルクの最大値は周期的に正負に変化（発生方向が
逆転）し、コギングトルクの最大値がゼロとなるときの
磁石長さＬｌ、Ｌ２は磁極ピッチＰｐの整数倍長さより
も少し長くなっている。ここで、（Ｌｌ−Ｐｐ）あるい
は（Ｌ２−２◆Ｐｐ）が付加長さＬαである。As a result, as shown in Figure 3, the maximum value of the cogging torque changes periodically between positive and negative (the direction of generation is reversed) with respect to the magnet length L, and the magnet length when the maximum value of the cogging torque becomes zero The lengths Ll and L2 are slightly longer than an integral multiple of the magnetic pole pitch Pp. Here, (Ll-Pp) or (L2-2◆Pp) is the additional length Lα.
第３図は８１極間ギャップ長さｇｐと磁極−磁石間ギャ
ップ長さｇを一定の値に固定して計算した結果のグラフ
であるが、それらを変化させて同様の解析を行った結果
得られたグラフが第４図である。Figure 3 is a graph of the results calculated by fixing the 81-pole gap length gp and the magnetic pole-magnet gap length g to constant values, but the results were obtained by performing the same analysis by changing them. The resulting graph is shown in Figure 4.
第４図においては全てのパラメータが磁極ピッチＰｐで
除して一般化されているが、横軸は磁極−磁石間キャッ
プ長さｇ／Ｐｐ、縦軸は付加長さＬα／Ｐｐを表し、図
中の直線は各磁極間ギヤ・ンブ長さｇｐ／Ｐｐをパラメ
ータとして描かれている。なお、図の視認性のために磁
極間ギャップ長さｇρ／Ｐｐは２つの値の場合のみを掲
げた。第４図より、付加長さＬα／Ｐｐは他の２つのパ
ラメータｇ／Ｐｐ。In Fig. 4, all parameters are generalized by dividing by the magnetic pole pitch Pp, the horizontal axis represents the magnetic pole-magnet cap length g/Pp, and the vertical axis represents the additional length Lα/Pp. The straight line inside is drawn using each magnetic pole gear length gp/Pp as a parameter. Note that for the sake of visibility in the figure, only two values of the inter-pole gap length gρ/Pp are listed. From FIG. 4, the additional length Lα/Pp is the other two parameters g/Pp.
ｇｐ／Ｐの一次式でほぼ表されることがわかる。すなわ
ち、
Ｌα／Ｐｐ＝ａ（ｇ／Ｐｐ）＋ｂ・（ｇｐ／Ｐ）＋ｃあ
るいは、
Ｌα＝ａ１１ｇ＋ ｂ１１ｇρ＋ Ｃ令Ｐｐとなる。多
数回の計算を基に、この式の係数ａ、ｂ、 ｃを求め
ると、
ａ＝０．５、ｂ＝０．４、ｃ ＝ −０，０５であるこ
とがわかる。更に、それらの係数の（直の変動がコギン
グトルクの大きさに及ぼす影響を解析した結果、０．４
≦ａ≦０．６．０．３≦ｂ≦０．５、−０．０６≦Ｃ≦
−０，０４の範囲であれば、コギングトルクは最大１Ｉ
Ｉｉ（第３図のピーク高さＦｍ）の２０％程度以下に抑
えることができ、実用上問題の無いものとなることが判
明した。It can be seen that it is approximately expressed by the linear expression gp/P. That is, Lα/Pp=a(g/Pp)+b·(gp/P)+c or Lα=a11g+b11gρ+C order Pp. When the coefficients a, b, and c of this equation are determined based on multiple calculations, it is found that a=0.5, b=0.4, and c=−0.05. Furthermore, as a result of analyzing the influence of the direct fluctuation of these coefficients on the magnitude of cogging torque, it was found that 0.4
≦a≦0.6, 0.3≦b≦0.5, -0.06≦C≦
-0.04 range, cogging torque is maximum 1I
It has been found that it can be suppressed to about 20% or less of Ii (peak height Fm in FIG. 3), and there is no problem in practical use.
［実施例］
本発明を、第５図に示すような出カフ００Ｗの３相交流
モータ３０に適用した例を次に述べる。本実施例では、
外筒が、その内面に１８個の磁極３２を配列したステー
タ３４となり、内筒が、その外周に６個の磁石３６を配
列したロータ３８となる。ステータ３４の磁極３２の先
端部３２ｂは回転中心０から半径２０ｍｍの距離にあり
、その円周上の磁極ピッチはＰｐ＝２Ｘ２０Ｘπ／１Ｂ
＝６．９８ ｍｍ。[Example] An example in which the present invention is applied to a three-phase AC motor 30 with an output power of 00 W as shown in FIG. 5 will be described below. In this example,
The outer cylinder serves as a stator 34 with 18 magnetic poles 32 arranged on its inner surface, and the inner cylinder serves as a rotor 38 with 6 magnets 36 arranged on its outer periphery. The tip 32b of the magnetic pole 32 of the stator 34 is located at a distance of 20 mm radius from the rotation center 0, and the magnetic pole pitch on the circumference is Pp = 2X20Xπ/1B
=6.98 mm.
磁極間ギャップ長さは ｇρ＝２．０ｍｍ。The gap length between magnetic poles is gρ=2.0mm.
そして、磁極−磁石間キャップ長さは
ｇ＝０．９ｍｍ
である。これらの値を前記式（２）に代入すると、Ｌα
＝０．５Ｘ０．９＋〇、４Ｘ２．Ｏ−０，０５Ｘ６．９
Ｂ＝０．９０
従って、式（１）のｎを２とすると、
Ｌ ＝ ２ Ｘ ６．９Ｂ＋ ０．９０＝ １４．８
ｍｍとなる。The length of the magnetic pole-magnet cap is g=0.9 mm. Substituting these values into equation (2) above, Lα
=0.5X0.9+○,4X2. O-0,05X6.9
B=0.90 Therefore, if n in equation (1) is 2, L = 2 x 6.9B+ 0.90= 14.8
It becomes mm.
このようにして磁石３６の円周方向の長さを定めた交流
モータ３０の回転は滑らかであり、コギングトルクはほ
ぼゼロとなる。The AC motor 30 whose length in the circumferential direction of the magnet 36 is determined in this way rotates smoothly, and the cogging torque becomes almost zero.
なお、上記例ではｎ＝１としても、第３図から明らかな
ように、コギングトルクはほぼゼロになるが、ｎ＝２と
した方が磁石３６間の距離が小さくなり、より大きな出
力トルクが得られる。In addition, in the above example, even if n=1, the cogging torque becomes almost zero as is clear from FIG. 3, but if n=2, the distance between the magnets 36 becomes smaller and a larger output torque is obtained. can get.
［発明の効果コ
交流モータを設計する際に、磁極ピッチ、磁極間ギャッ
プ、磁極−磁石間のギャップの諸元が定まれば、磁極に
対向する磁石の長さしを本発明に従い定めることにより
、そのモータのコギングトルクをほぼゼロとすることが
できる。これにより、コギングトルクの発生を抑えなが
ら磁極−磁石間のギャップを小さくすることができるた
め、高効率のモータが得られる。また、磁石の形状が単
純なものでよいため、加工が容易になるとともに、磁石
の形状変更に伴う出力トルクの低下（モータ効率の低下
）も避けられる。[Effects of the invention] When designing an AC motor, once the specifications of the magnetic pole pitch, the gap between magnetic poles, and the gap between magnetic poles and magnets are determined, by determining the length of the magnet facing the magnetic pole according to the present invention. , the cogging torque of the motor can be reduced to almost zero. This makes it possible to reduce the gap between the magnetic poles and the magnets while suppressing the generation of cogging torque, resulting in a highly efficient motor. Furthermore, since the magnet may have a simple shape, processing becomes easy and a decrease in output torque (deterioration in motor efficiency) due to a change in the shape of the magnet can be avoided.
第１図は磁極と磁石の位置関係を示す模式図、第２図は
コンピュータシミュレーション結果である磁束線図、第
３図は磁石長さしに対するコギングトルクの変化を示す
グラフ、第４図は磁極−磁石間ギャップ長さｇおよび磁
極間ギヤ・ンブ長さｇｐに対するコギングトルクがゼロ
となる磁石の付加長さＬαの関係を磁極ピ・ンチＰρに
より無次元化して示したグラフ、第５図は本発明を実施
した３相交流モータの断面図である。Figure 1 is a schematic diagram showing the positional relationship between magnetic poles and magnets, Figure 2 is a magnetic flux line diagram that is the result of a computer simulation, Figure 3 is a graph showing changes in cogging torque with respect to magnet length, and Figure 4 is a graph showing magnetic poles. - A graph showing the relationship of the additional length Lα of the magnet at which the cogging torque becomes zero with respect to the inter-magnet gap length g and the inter-pole gear band length gp, which is made dimensionless by the magnetic pole pinch Pρ. 1 is a sectional view of a three-phase AC motor implementing the present invention.
Claims (1)
ッチＰｐで配列された複数の磁極を有するステータと、
その磁極に対して径方向に長さｇの空隙を設けて円周上
に配列された多数の永久磁石を有するロータとを備える
交流モータにおいて、各永久磁石の円周方向の長さＬを
、 Ｌ＝ｎ・Ｐｐ＋ａ・ｇ＋ｂ・ｇｐ＋ｃ・Ｐｐで定め、こ
こで、ｎを任意の整数に、ａを０．４〜０．６に、ｂを
０．３〜０．５に、ｃを−０．０６〜−０．０４にする
ことを特徴とする交流モータ。[Claims] A stator having a plurality of magnetic poles arranged at a constant pitch Pp on a circumference with a gap of length gp between adjacent magnetic poles;
In an AC motor equipped with a rotor having a large number of permanent magnets arranged on the circumference with a gap of length g in the radial direction relative to the magnetic poles, the length L in the circumferential direction of each permanent magnet is L=n・Pp+a・g+b・gp+c・Pp, where n is an arbitrary integer, a is 0.4 to 0.6, b is 0.3 to 0.5, and c is -0. An AC motor characterized in that the voltage is set to .06 to -0.04.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1018399A JP2649403B2 (en) | 1989-01-27 | 1989-01-27 | AC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1018399A JP2649403B2 (en) | 1989-01-27 | 1989-01-27 | AC motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02202329A true JPH02202329A (en) | 1990-08-10 |
| JP2649403B2 JP2649403B2 (en) | 1997-09-03 |
Family
ID=11970613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1018399A Expired - Lifetime JP2649403B2 (en) | 1989-01-27 | 1989-01-27 | AC motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2649403B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5631512A (en) * | 1994-04-13 | 1997-05-20 | Toyota Jidosha Kabushiki Kaisha | Synchronous motor having magnetic poles of permanent magnet and magnetic poles of a soft magnetic material |
| EP0901214A2 (en) * | 1997-09-05 | 1999-03-10 | Toyota Jidosha Kabushiki Kaisha | Magnets containing-type alternating-current motor and method of designing the same |
| US6025691A (en) * | 1995-05-29 | 2000-02-15 | Toyota Jidosha Kabushiki Kaisha | Synchronous motor control system and method of controlling synchronous motor |
| JP2001251827A (en) * | 2000-03-03 | 2001-09-14 | Hitachi Ltd | Permanent magnet dynamo-electric machine and hybrid electric car using the same |
| JP2005269693A (en) * | 2004-03-16 | 2005-09-29 | Mitsubishi Electric Corp | Permanent magnet motor |
| JP2010022088A (en) * | 2008-07-08 | 2010-01-28 | Kokusan Denki Co Ltd | Magnet rotation type rotary electric machine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035330B (en) * | 2009-10-07 | 2014-09-24 | 阿斯莫有限公司 | Motor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60261344A (en) * | 1984-06-06 | 1985-12-24 | Mitsubishi Chem Ind Ltd | Motor |
| JPS6158455A (en) * | 1984-08-30 | 1986-03-25 | Mitsubishi Chem Ind Ltd | Motor |
-
1989
- 1989-01-27 JP JP1018399A patent/JP2649403B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60261344A (en) * | 1984-06-06 | 1985-12-24 | Mitsubishi Chem Ind Ltd | Motor |
| JPS6158455A (en) * | 1984-08-30 | 1986-03-25 | Mitsubishi Chem Ind Ltd | Motor |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5631512A (en) * | 1994-04-13 | 1997-05-20 | Toyota Jidosha Kabushiki Kaisha | Synchronous motor having magnetic poles of permanent magnet and magnetic poles of a soft magnetic material |
| US6025691A (en) * | 1995-05-29 | 2000-02-15 | Toyota Jidosha Kabushiki Kaisha | Synchronous motor control system and method of controlling synchronous motor |
| EP0901214A2 (en) * | 1997-09-05 | 1999-03-10 | Toyota Jidosha Kabushiki Kaisha | Magnets containing-type alternating-current motor and method of designing the same |
| US5990592A (en) * | 1997-09-05 | 1999-11-23 | Toyota Jidosha Kabushiki Kaisha | Magnets containing-type alternating-current motor and method of designing the same |
| JP2001251827A (en) * | 2000-03-03 | 2001-09-14 | Hitachi Ltd | Permanent magnet dynamo-electric machine and hybrid electric car using the same |
| JP2005269693A (en) * | 2004-03-16 | 2005-09-29 | Mitsubishi Electric Corp | Permanent magnet motor |
| JP2010022088A (en) * | 2008-07-08 | 2010-01-28 | Kokusan Denki Co Ltd | Magnet rotation type rotary electric machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2649403B2 (en) | 1997-09-03 |
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