JPH09103062A - Brushless direct current motor - Google Patents
Brushless direct current motorInfo
- Publication number
- JPH09103062A JPH09103062A JP8171124A JP17112496A JPH09103062A JP H09103062 A JPH09103062 A JP H09103062A JP 8171124 A JP8171124 A JP 8171124A JP 17112496 A JP17112496 A JP 17112496A JP H09103062 A JPH09103062 A JP H09103062A
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- rotor
- brushless
- motor
- laminated core
- 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
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/02—Cores, Yokes, or armatures made from sheets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0233—Manufacturing of magnetic circuits made from sheets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Brushless Motors (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はブラシレス直流モー
ターに関するものであって、積層コアと永久磁石との相
互作用によるコギングトルク（cogging torque）を増大
させずに、このコギングトルクが、固定子に電流を切り
換え／通電するスイッチング作用によって発生するトル
クリプル（torque ripple ）を低減して、良好な回転状
態を維持できるようにしたブラシレス直流モーターに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless direct current motor, which can increase the cogging torque due to the interaction between a laminated core and a permanent magnet without increasing the cogging torque. The present invention relates to a brushless DC motor capable of maintaining a good rotation state by reducing a torque ripple generated by a switching action of switching / energizing.
【０００２】[0002]
【従来の技術】一般的なモーターは固定子と回転子とか
ら構成され、固定子には放射状に形成された積層コア
（core）にワイヤー（wire）が巻線されており、固定子
に対向する回転子には極性を交互に反転させながら円形
を成すように形成された永久磁石が固定して設けられて
いる。2. Description of the Related Art A general motor is composed of a stator and a rotor. A wire is wound around a radially formed laminated core on the stator and faces the stator. The rotor is fixedly provided with permanent magnets formed in a circular shape while alternately inverting the polarities.
【０００３】上記のように構成されたモーターでは、回
転子は固定子に対向した状態で回転運動をし、また、上
記のように回転する回転子の位置を回転子位置検出素子
が検出して回転子の位置を認識し、認識された状況によ
り電流を適切に切り換えて通電することにより、モータ
ーの回転子が一定方向のみに回転するようになってい
る。In the motor constructed as described above, the rotor makes a rotary motion in a state of facing the stator, and the rotor position detecting element detects the position of the rotating rotor as described above. By recognizing the position of the rotor and appropriately switching the current according to the recognized situation to energize it, the rotor of the motor rotates only in a fixed direction.
【０００４】従って、上記のようなブラシレス直流モー
ターでは、積層コアと回転子に結合された永久磁石との
相互作用の存在下、回転子の各回転位置で回転子と固定
子の各歯の相対位置が異なるため、磁束が変動すること
になってトルクが変動するコギング現象が発生してお
り、また、固定子に電流を切り換え／通電するスイッチ
ング作用によって平均値周辺で周期的な変化、すなわ
ち、好ましくないリプル（ripple）現象が発生してい
る。Therefore, in the brushless DC motor as described above, in the presence of the interaction between the laminated core and the permanent magnet coupled to the rotor, the relative positions of the teeth of the rotor and the stator at each rotational position of the rotor. Since the position is different, the magnetic flux fluctuates and the torque fluctuates, which causes a cogging phenomenon. Also, the switching action of switching / energizing a current to the stator causes a periodic change around the average value, that is, An undesired ripple phenomenon occurs.
【０００５】図６のように従来は、回転子の永久磁石１
と対向する面に位置する固定子の積層コア２の終端部は
均一面を成すように形成されている。この構造において
は、積層コア２の終端部が永久磁石１の内周面に近づい
たとき、終端部の隙間（gap）が均一に形成されている
ため、固定子に積層されるコア２と回転子に結合された
永久磁石１との相互作用によってコギング（cogging ）
トルクが発生することになり、上記トルクのリプル（ri
pple）を増幅させ、図７のように実際出力トルクのリプ
ルを大きく増大させることになっていた。Conventionally, as shown in FIG. 6, a permanent magnet 1 of a rotor is used.
The end portion of the laminated core 2 of the stator, which is located on the surface opposite to, is formed so as to form a uniform surface. In this structure, when the end portion of the laminated core 2 approaches the inner peripheral surface of the permanent magnet 1, the gap (gap) at the end portion is uniformly formed. Cogging by interaction with the permanent magnet 1 coupled to the child
Torque is generated, and the torque ripple (ri
pple) was amplified and the ripple of the actual output torque was greatly increased as shown in FIG.
【０００６】従って周知のように、このようなコギング
トルクとトルクリプル現象は、モーター駆動において、
回転特性を低下させ良質の回転状態を困難にし、また、
回転するモーターの正確な制御も困難となるので、使用
上、精度低下を招くという問題点があった。Therefore, as is well known, such a cogging torque and a torque ripple phenomenon occur in a motor drive.
It deteriorates the rotation characteristics and makes it difficult to rotate in good quality.
Since it is difficult to control the rotating motor accurately, there is a problem in that the accuracy is lowered in use.
【０００７】一方、最近の日本の特許では、積層コアの
終端部に凹溝または突出部を形成してマグネットとの隙
間（air gap ）を不均一にしたものが多数あり、また、
米国特許第4,599,664 号では積層コアの終端部とマグネ
ットとの間の隙間を不均一にしたものがあった。On the other hand, in recent Japanese patents, there are many ones in which a groove or a protrusion is formed at the end of the laminated core to make the air gap with the magnet non-uniform.
In U.S. Pat. No. 4,599,664, the gap between the end of the laminated core and the magnet was uneven.
【０００８】上記日本の特許の場合、モーターの回転方
向に関係なくコギングをある程度減らすことができる
が、積層コアの終端部に形成した凹溝または突出部は左
右対称形となるようにしたため、積層コアの終端部を非
対称形に形成して一定方向のみの回転駆動を行わせる本
発明の構成に比して、その効果は非常に不十分なもので
ある。In the case of the above-mentioned Japanese patent, the cogging can be reduced to some extent irrespective of the rotation direction of the motor. However, since the groove or protrusion formed at the end of the laminated core is symmetrical, the laminated core is laminated. The effect is extremely unsatisfactory as compared with the configuration of the present invention in which the terminal end portion of the core is formed asymmetrically and rotationally driven only in a fixed direction.
【０００９】また、上記米国特許の場合には、積層コア
の終端部を非対称形状に形成しているが、これは回転子
の回転位置検出手段（ホール素子等）の使用数量を最小
個数である一つに減らすことを目的としたものであっ
て、位置検出手段を一つに減らしても、モーターの回転
子が回転して停止点があったとしても、上記積層コアの
終端部が非対称形であるために、停止点でも力の作用が
残って回転できるようにすることにのみ特徴があるもの
である。Further, in the case of the above-mentioned US patent, the end portion of the laminated core is formed in an asymmetrical shape, but this is the minimum number of rotor rotational position detecting means (Hall elements etc.) used. The purpose is to reduce the number to one, and even if the number of position detecting means is reduced to one, even if the rotor of the motor rotates and there is a stop point, the end portion of the laminated core has an asymmetrical shape. Therefore, it is characterized only by allowing the action of force to remain even at the stopping point to allow the rotation.
【００１０】[0010]
【発明が解決しようとする課題】本発明は、上記のよう
な従来のブラシレス直流モーターが有する問題点を勘案
してこれを解消するために案出されたものであって、ブ
ラシレス直流モーターの固定子に備えられた積層コアと
回転子に結合された永久磁石との相互作用によるコギン
グ（cogging ）トルクにより、固定子に電流を切り換え
／通電して発生するトルクのリプル（ripple）を増大さ
せず、かえって低減できるようにしたブラシレス直流モ
ーターを提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been devised in order to solve the problems of the conventional brushless DC motor as described above and solves the problem. The cogging torque due to the interaction between the laminated core provided in the child and the permanent magnet coupled to the rotor does not increase the ripple of the torque generated by switching / energizing the stator. The object of the present invention is to provide a brushless DC motor that can be reduced.
【００１１】[0011]
【課題を解決するための手段】上記の目的を達成するた
めに本発明では、固定子と、回転子と、回転子の位置検
出を目的として備えられる少なくとも一つの位置検出手
段とを含み、位置検出手段で位置を認識して電流を切り
換え／通電することにより、回転子を一方向のみに回転
させるようにしたブラシレス直流モーターにおいて、極
性を交互に反転させながら円形をなすように回転子に複
数の永久磁石を形成し、固定子上で永久磁石の内周面と
向かい合うように放射状に、各々にワイヤーを巻いて複
数の積層コアを形成し、この構造において、永久磁石の
内周面と向かい合う積層コアの終端部は永久磁石の内周
面に近い第１部分と内周面から遠い第２部分とを有して
非対称形状をなすように形成し、かつ、第１部分は永久
磁石の回転方向にみて第２部分に対して前方に位置する
ように形成してブラシレス直流モーターを構成した。In order to achieve the above object, the present invention comprises a stator, a rotor, and at least one position detecting means provided for the purpose of detecting the position of the rotor. In a brushless DC motor in which a rotor is rotated only in one direction by recognizing a position and switching / energizing a current by detecting a position, a plurality of rotors are formed in a circular shape while alternately reversing polarities. Forming a permanent magnet, and winding a wire around each of them so as to face the inner peripheral surface of the permanent magnet on the stator to form a plurality of laminated cores, and in this structure, face the inner peripheral surface of the permanent magnet. The end portion of the laminated core is formed to have an asymmetrical shape with a first portion near the inner peripheral surface of the permanent magnet and a second portion distant from the inner peripheral surface, and the first portion rotates the permanent magnet. In the direction To constitute a brushless DC motor is formed so as to be located forward with respect to the second portion Te.
【００１２】積層コアの終端部の第１部分及び第２部分
は、不連続な段差を設けて相互に不連続な面として形成
しても良いし、両者を通して連続な曲面として形成して
も良い。また、回転子の位置検出手段は、２以上の複数
個設けて位置を検出できるようにすることが好ましい。The first portion and the second portion of the terminal end portion of the laminated core may be formed as discontinuous surfaces by providing discontinuous steps, or may be formed as a continuous curved surface through both. . Further, it is preferable that two or more rotor position detecting means are provided so that the position can be detected.
【００１３】[0013]
【発明の実施の形態】以下、本発明によるブラシレス直
流モーターのコアの一実施例について、添付した図面を
参照しながら詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a brushless DC motor core according to the present invention will now be described in detail with reference to the accompanying drawings.
【００１４】図１は、永久磁石１を有する回転子と積層
コア３を形成した固定子とを組み立てて得られた、本発
明によるブラシレス直流モーターの一実施例を示した図
である。永久磁石１に対向する積層コア３の終端部３０
の面を非対称形に形成するが、その中間部分を境界点３
２として段差３１を形成し、境界点３２を境に片側は永
久磁石１により近く、他の片側は永久磁石１により遠く
なるように形成する。FIG. 1 is a diagram showing an embodiment of a brushless DC motor according to the present invention obtained by assembling a rotor having a permanent magnet 1 and a stator having a laminated core 3 formed therein. The end portion 30 of the laminated core 3 facing the permanent magnet 1
Is formed asymmetrically, but the middle part of
A step 31 is formed as 2, and one side is closer to the permanent magnet 1 and the other side is farther from the permanent magnet 1 at the boundary point 32.
【００１５】上記のように永久磁石１に対向する積層コ
ア３の終端部３０に段差３１を設けたため、回転子の回
転方向により、コギングトルクと電気的発生トルクとの
間に位相差が生じ、回転子が設計方向（図１の矢印方
向）にのみ回転する場合、図４に示したようにトルクリ
プルの減少により速度の均一性の向上を図ることができ
る。また、回転子が設計方向と反対の方向に回転する場
合には、図５に示したようにトルクリプルがかえって増
加して性能が低下するが、モーターを一方向のみに回転
させる応用事例では問題とはならない。Since the step 31 is provided at the terminal end 30 of the laminated core 3 facing the permanent magnet 1 as described above, a phase difference occurs between the cogging torque and the electrically generated torque depending on the rotating direction of the rotor, When the rotor rotates only in the design direction (arrow direction in FIG. 1), the speed ripple can be improved by reducing the torque ripple as shown in FIG. Further, when the rotor rotates in the direction opposite to the design direction, the torque ripple rather increases and the performance deteriorates as shown in FIG. 5, but this is a problem in the application example in which the motor is rotated in only one direction. Don't
【００１６】本実施例では、回転子の回転を検知するた
めの回転子位置検出素子は常に２個以上のホール素子を
使用する。In this embodiment, the rotor position detecting element for detecting the rotation of the rotor always uses two or more Hall elements.
【００１７】図１の凹部模様を図３の図面のように実施
することができる。すなわち、積層コア３の終端部３０
を非対称形状に形成するが、段差を有する非対称形状で
はなく、曲面から成された非対称形に、やはり中間部分
から片側は永久磁石１により近く、他の片側は永久磁石
１からより遠くなるように形成する。The recess pattern of FIG. 1 can be implemented as in the drawing of FIG. That is, the end portion 30 of the laminated core 3
Is formed into an asymmetrical shape, but is not an asymmetrical shape having a step, but an asymmetrical shape made of a curved surface so that one side is closer to the permanent magnet 1 and the other side is farther from the permanent magnet 1 from the intermediate portion. Form.
【００１８】このような実施例の場合にも、設計方向
（図１の矢印方向）に回転子が回転する時には図４に示
したようにトルクリプルの減少により速度の均一性の向
上を図ることができ、その反対方向に回転する場合には
図５に示したようにトルクリプルがかえって増加して性
能が低下するが、モーターを一方向のみに回転させる応
用事例ではやはり問題とはならない。Also in the case of such an embodiment, when the rotor rotates in the design direction (the direction of the arrow in FIG. 1), it is possible to improve the speed uniformity by reducing the torque ripple as shown in FIG. However, when the motor rotates in the opposite direction, the torque ripple rather increases and the performance deteriorates as shown in FIG. 5, but this is not a problem in the application example in which the motor is rotated in only one direction.
【００１９】[0019]
【発明の効果】このように本発明では、永久磁石１の内
周面に近接する積層コア３の終端部３０が非対称形に形
成されているため、この終端部３０により発生するコギ
ングトルクが有効な方向に位相差を生じ、このために、
コギングトルクによるトルクリプルが減少し、設計方向
のみに回転駆動する場合にはコギングトルクが電気的に
発生するトルクリプルの効果を低減して回転速度の均一
性が向上する。As described above, according to the present invention, since the end portion 30 of the laminated core 3 which is close to the inner peripheral surface of the permanent magnet 1 is formed asymmetrically, the cogging torque generated by the end portion 30 is effective. Phase difference in the
The torque ripple due to the cogging torque is reduced, and when rotationally driven only in the design direction, the effect of the torque ripple electrically generated by the cogging torque is reduced and the uniformity of the rotation speed is improved.
【図１】本発明の実施例によるブラシレス直流モーター
の、永久磁石とコアの組立状態を示す内部構造図であ
る。FIG. 1 is an internal structural view showing a state in which a permanent magnet and a core are assembled in a brushless DC motor according to an embodiment of the present invention.
【図２】図１の要部拡大図である。FIG. 2 is an enlarged view of a main part of FIG.
【図３】本発明の他の実施例を示す要部拡大図である。FIG. 3 is an enlarged view of a main part showing another embodiment of the present invention.
【図４】本発明の実施例によるブラシレス直流モーター
を設計回転方向に回転させた場合に観察されるトルクの
各成分の分布を示す図である。FIG. 4 is a diagram showing a distribution of torque components observed when a brushless DC motor according to an embodiment of the present invention is rotated in a designed rotation direction.
【図５】本発明の実施例によるブラシレス直流モーター
を設計回転方向と反対方向に回転させた場合に観察され
るトルクの各成分の分布を示す図である。FIG. 5 is a diagram showing a distribution of torque components observed when a brushless DC motor according to an embodiment of the present invention is rotated in a direction opposite to a design rotation direction.
【図６】従来のブラシレス直流モーターの、永久磁石と
コアの組立状態を示す内部構造図である。FIG. 6 is an internal structural diagram showing the assembled state of a permanent magnet and a core of a conventional brushless DC motor.
【図７】図６のブラシレス直流モーターから発生するト
ルクの各成分の分布を示す図である。7 is a diagram showing the distribution of each component of torque generated from the brushless DC motor of FIG.
１ 永久磁石 ２ 従来の積層コア ３ 積層コア ３０ 積層コアの終端部 ３１ 積層コアの終端部の段差 ３２ 段差の境界点 DESCRIPTION OF SYMBOLS 1 Permanent magnet 2 Conventional laminated core 3 Laminated core 30 End portion of laminated core 31 Step difference at the end portion of laminated core 32 Boundary point of step difference
Claims (5)
検出を目的として備えられる少なくとも一つの位置検出
手段とを含み、前記位置検出手段で位置を認識して電流
を切り換え／通電することにより、前記回転子を一方向
のみに回転させるようにしたブラシレス直流モーターに
おいて、極性を交互に反転させながら円形をなすように
前記回転子に形成された複数の永久磁石と、前記固定子
上で前記永久磁石の内周面と向かい合うように放射状に
形成されて、各々にワイヤーが巻かれた複数の積層コア
とを有し、前記永久磁石の内周面と向かい合う前記積層
コアの終端部は、前記永久磁石の内周面に近い第１部分
と前記内周面から遠い第２部分とを有して非対称形状を
なすように形成され、前記第１部分は、前記永久磁石の
回転方向にみて前記第２部分に対して前方に位置するこ
とを特徴とするブラシレス直流モーター。1. A stator, a rotor, and at least one position detecting means provided for the purpose of detecting the position of the rotor, wherein the position detecting means recognizes a position to switch / energize an electric current. As a result, in the brushless DC motor configured to rotate the rotor in only one direction, a plurality of permanent magnets formed on the rotor so as to form a circle while alternately reversing the polarities, and the stator And a plurality of laminated cores that are radially formed so as to face the inner peripheral surface of the permanent magnet and each have a wire wound around it, and the end portion of the laminated core that faces the inner peripheral surface of the permanent magnet is A permanent magnet having a first portion close to the inner circumferential surface and a second portion far from the inner circumferential surface, the first magnet portion being formed in an asymmetrical shape, and the first portion in the rotational direction of the permanent magnet. See above A brushless DC motor characterized in that it is located in front of the second part.
２部分は、不連続な段差を有して形成されていることを
特徴とする、請求項１に記載のブラシレス直流モータ
ー。2. The brushless DC motor according to claim 1, wherein the first portion and the second portion of the terminal end portion of the laminated core are formed with discontinuous steps.
中間部分に形成されていることを特徴とする、請求項２
に記載のブラシレス直流モーター。3. The boundary point of the step is formed at an intermediate portion of the end portion of the laminated core.
Brushless DC motor described in.
２部分は、両者を通して連続な曲面状に形成されている
ことを特徴とする、請求項１に記載のブラシレス直流モ
ーター。4. The brushless DC motor according to claim 1, wherein the first portion and the second portion of the terminal end portion of the laminated core are formed in a continuous curved surface shape through them.
複数個設けて位置を検出できるようにしていることを特
徴とする、請求項１に記載のブラシレス直流モーター。5. The brushless DC motor according to claim 1, wherein two or more rotor position detecting means are provided to detect the position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950019354A KR100193572B1 (en) | 1995-06-30 | 1995-06-30 | Breathless DC Motor |
| KR1995-19354 | 1995-06-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09103062A true JPH09103062A (en) | 1997-04-15 |
Family
ID=19419652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8171124A Pending JPH09103062A (en) | 1995-06-30 | 1996-07-01 | Brushless direct current motor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH09103062A (en) |
| KR (1) | KR100193572B1 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000072427A1 (en) * | 1999-05-21 | 2000-11-30 | Matsushita Electric Industrial Co., Ltd. | Motor with permanent magnet |
| WO2003105318A1 (en) * | 2002-06-04 | 2003-12-18 | Wavecrest Laboratories Llc | Rotary permanent magnet electric motor with varying air gap between interfacing stator and rotor elements |
| JP2005051841A (en) * | 2003-07-30 | 2005-02-24 | Hitachi Ltd | Motor, compressor, and air conditioner |
| CN100362738C (en) * | 2005-03-22 | 2008-01-16 | 台达电子工业股份有限公司 | Motor starting method containing asymmetric air gap structure |
| KR100878565B1 (en) * | 2007-08-08 | 2009-01-15 | 주식회사 원진일렉트로닉스 | Cogging torque reduction device of brushless direct current motors |
| JP2010114952A (en) * | 2008-11-04 | 2010-05-20 | Mitsubishi Electric Corp | Motor, compressor, blower, and ventilator |
| JP2011234435A (en) * | 2010-04-23 | 2011-11-17 | Sanso Electric Co Ltd | Motor and stator of motor |
| CN104795953A (en) * | 2015-04-29 | 2015-07-22 | 山东大学 | Switch reluctance machine with stator separated from rotor |
| CN112165187A (en) * | 2020-09-30 | 2021-01-01 | 安徽美芝精密制造有限公司 | Motor and compressor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014073715A1 (en) * | 2012-11-06 | 2014-05-15 | (주)태극기전 | Magnetic motor for orientation control, control method therefor, and camera module using same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58195491A (en) * | 1982-05-08 | 1983-11-14 | Matsushita Electric Ind Co Ltd | Transistor motor |
| JPS58198158A (en) * | 1982-05-13 | 1983-11-18 | Japan Servo Co Ltd | Dc brushless motor |
| JPS6340175B2 (en) * | 1979-06-27 | 1988-08-10 | Sankyo Kk |
-
1995
- 1995-06-30 KR KR1019950019354A patent/KR100193572B1/en not_active IP Right Cessation
-
1996
- 1996-07-01 JP JP8171124A patent/JPH09103062A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6340175B2 (en) * | 1979-06-27 | 1988-08-10 | Sankyo Kk | |
| JPS58195491A (en) * | 1982-05-08 | 1983-11-14 | Matsushita Electric Ind Co Ltd | Transistor motor |
| JPS58198158A (en) * | 1982-05-13 | 1983-11-18 | Japan Servo Co Ltd | Dc brushless motor |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000072427A1 (en) * | 1999-05-21 | 2000-11-30 | Matsushita Electric Industrial Co., Ltd. | Motor with permanent magnet |
| GB2364448A (en) * | 1999-05-21 | 2002-01-23 | Matsushita Electric Ind Co Ltd | Motor with permanent magnet |
| US6583531B1 (en) | 1999-05-21 | 2003-06-24 | Matsushita Electric Industrial Co., Ltd. | Motor with permanent magnet |
| GB2364448B (en) * | 1999-05-21 | 2003-12-03 | Matsushita Electric Ind Co Ltd | Motor with permanent magnet |
| WO2003105318A1 (en) * | 2002-06-04 | 2003-12-18 | Wavecrest Laboratories Llc | Rotary permanent magnet electric motor with varying air gap between interfacing stator and rotor elements |
| JP2005051841A (en) * | 2003-07-30 | 2005-02-24 | Hitachi Ltd | Motor, compressor, and air conditioner |
| CN100362738C (en) * | 2005-03-22 | 2008-01-16 | 台达电子工业股份有限公司 | Motor starting method containing asymmetric air gap structure |
| KR100878565B1 (en) * | 2007-08-08 | 2009-01-15 | 주식회사 원진일렉트로닉스 | Cogging torque reduction device of brushless direct current motors |
| JP2010114952A (en) * | 2008-11-04 | 2010-05-20 | Mitsubishi Electric Corp | Motor, compressor, blower, and ventilator |
| JP2011234435A (en) * | 2010-04-23 | 2011-11-17 | Sanso Electric Co Ltd | Motor and stator of motor |
| CN104795953A (en) * | 2015-04-29 | 2015-07-22 | 山东大学 | Switch reluctance machine with stator separated from rotor |
| CN112165187A (en) * | 2020-09-30 | 2021-01-01 | 安徽美芝精密制造有限公司 | Motor and compressor |
| CN112165187B (en) * | 2020-09-30 | 2021-07-30 | 安徽美芝精密制造有限公司 | Motor and compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| KR970004242A (en) | 1997-01-29 |
| KR100193572B1 (en) | 1999-06-15 |
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