JPH05236686A - Brushless cd motor - Google Patents
Brushless cd motorInfo
- Publication number
- JPH05236686A JPH05236686A JP4033248A JP3324892A JPH05236686A JP H05236686 A JPH05236686 A JP H05236686A JP 4033248 A JP4033248 A JP 4033248A JP 3324892 A JP3324892 A JP 3324892A JP H05236686 A JPH05236686 A JP H05236686A
- Authority
- JP
- Japan
- Prior art keywords
- rotor core
- rotor
- magnetic flux
- brushless
- motor
- 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 Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は電機子鉄心に電機子巻
線を巻回してなる電機子と回転子鉄心に永久磁石を埋込
んでなる回転子とを含むブラシレスＤＣモータに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless DC motor including an armature having an armature winding wound around an armature core and a rotor having a permanent magnet embedded in the rotor core.
【０００２】[0002]
【従来の技術】従来から圧縮機等の駆動源として、電気
的制御が容易であること等の利点に着目してモータが採
用されている。また、モータには種々の種類のものがあ
るが、現状では、三相交流電源を用いて回転磁界を簡単
に得ることができ、整流子を不要にできること、および
堅牢、低価格、取扱いの簡便さ等の利点に着目して三相
誘導電動機が最も一般的に用いられている。しかし、誘
導電動機は、電機子鉄心に電機子巻線を巻回しているだ
けでなく、回転子鉄心にも回転子巻線を巻回しており、
運転時には回転子巻線にも電流が流れるので、機械損が
存在しないと仮定した場合であっても、回転子巻線に電
流が流れることに起因する二次銅損分だけ出力が入力よ
りも減少し、余り効率を高めることができない。2. Description of the Related Art Conventionally, a motor has been adopted as a drive source for a compressor or the like, paying attention to advantages such as easy electric control. In addition, although there are various types of motors, at present, it is possible to easily obtain a rotating magnetic field by using a three-phase AC power supply, a commutator is not required, and it is robust, low-priced, and easy to handle. The three-phase induction motor is most commonly used because of its advantages. However, in the induction motor, not only is the armature winding wound around the armature core, but the rotor winding is also wound around the rotor core.
Since current also flows through the rotor winding during operation, even if it is assumed that there is no mechanical loss, the output is more than the input due to the secondary copper loss due to the current flowing in the rotor winding. It can be reduced and efficiency cannot be increased so much.
【０００３】この点に着目して、回転子鉄心に回転子巻
線を巻回する代わりに、回転子鉄心に永久磁石を装着し
て二次銅損を０にし、高い運転効率を達成できる永久磁
石モータが提案されている。この永久磁石モータは、回
転子鉄心の外周に少なくとも１対の永久磁石を設けた構
成のもの（以下、表面磁石構造と称する）、および回転
子鉄心の内部に少なくとも１対の永久磁石を埋込んだ構
成のもの（以下、埋込磁石構造と称する）に大別され
る。Focusing on this point, instead of winding the rotor winding around the rotor iron core, a permanent magnet is attached to the rotor iron core to reduce secondary copper loss to zero, and permanent operation can be achieved. Magnet motors have been proposed. This permanent magnet motor has a structure in which at least one pair of permanent magnets is provided on the outer circumference of a rotor core (hereinafter referred to as a surface magnet structure), and at least one pair of permanent magnets is embedded inside the rotor core. It is roughly divided into those having the above structure (hereinafter referred to as an embedded magnet structure).
【０００４】そして、表面磁石構造のものは回転子鉄心
の表面に単に永久磁石を装着しているだけであるから、
回転子を高速回転させると永久磁石が剥離する可能性が
高く、余り高速回転させることができない。したがっ
て、積層された回転子鉄心単体同士をかしめ固定する補
強方法、積層構造の回転子鉄心を貫通するようにピンま
たはボルトを挿通する補強方法、または積層構造の回転
子鉄心を樹脂モールドにより固定する補強方法が施され
ることになる（特開平３−３６９４５号公報、特開平３
−７４１５１号公報、実開平３−４０８４９号公報参
照）。In the surface magnet structure, a permanent magnet is simply attached to the surface of the rotor core,
When the rotor is rotated at a high speed, the permanent magnet is likely to peel off, and the rotor cannot be rotated at a high speed. Therefore, the reinforcing method of caulking and fixing the laminated rotor cores to each other, the reinforcing method of inserting a pin or a bolt to penetrate the rotor core of the laminated structure, or the rotor core of the laminated structure is fixed by resin molding. A reinforcing method will be applied (Japanese Patent Laid-Open No. 3-36945 and Japanese Patent Laid-Open No. 3-3945).
-74151 and Japanese Utility Model Laid-Open No. 3-40849).
【０００５】これに対して埋込磁石構造のものは回転子
鉄心の内部に永久磁石を埋込んでいるので永久磁石の剥
離を阻止でき、表面磁石構造のものよりも高速回転に対
処できる。したがって、高速回転を行なわせる必要があ
る用途には埋込磁石構造の永久磁石モータを採用するこ
とになる。上記埋込磁石構造のものの具体的構成として
は、図６に示すように回転子鉄心６１の内部に、半径方
向と直角な方向に向く状態で比較的薄肉の直方体状の永
久磁石６２を埋込むとともに、回転子鉄心内部における
磁束の短絡を防止するために永久磁石６２の、半径方向
と直角な方向の端面に連続して、回転子鉄心６１の外周
に近接する位置まで半径方向に延びる磁束短絡防止用の
空隙６３を形成し、空隙６３の外端部に連続する箇所を
磁束短絡部６４とした構成が提案されている。また、埋
込磁石構造の回転子においても、表面磁石構造における
補強方法と同様の補強方法が施される。尚、図６にはピ
ンまたはボルトによる補強構造を示しているが、他の補
強方法を採用できることはもちろんである。On the other hand, in the case of the embedded magnet structure, since the permanent magnet is embedded inside the rotor core, peeling of the permanent magnet can be prevented, and it is possible to cope with higher speed rotation than that of the surface magnet structure. Therefore, a permanent magnet motor having an embedded magnet structure is adopted for applications requiring high-speed rotation. As a specific configuration of the above-mentioned embedded magnet structure, as shown in FIG. 6, a relatively thin rectangular parallelepiped permanent magnet 62 is embedded inside a rotor core 61 in a state of being oriented in a direction perpendicular to the radial direction. At the same time, in order to prevent short-circuiting of magnetic flux inside the rotor core, a magnetic flux short-circuit extending continuously to the end surface of the permanent magnet 62 in the direction perpendicular to the radial direction and extending to a position close to the outer circumference of the rotor core 61 A structure has been proposed in which a gap 63 for prevention is formed, and a portion continuous to the outer end of the gap 63 is a magnetic flux short circuit portion 64. Further, also in the rotor having the embedded magnet structure, the same reinforcing method as that in the surface magnet structure is applied. Although a reinforcing structure using pins or bolts is shown in FIG. 6, it goes without saying that other reinforcing methods can be adopted.
【０００６】[0006]
【発明が解決しようとする課題】図６に示すように埋込
磁石構造の回転子鉄心をピンまたはボルトにより補強す
る構成を採用する場合には、単に機械的強度の向上を目
的としてピンまたはボルトの挿通位置を設定している。
したがって、ピンまたはボルトを挿通するための穴によ
り積層構造の回転子鉄心内部における磁束の流れが不規
則になってしまい、回転子鉄心における鉄損が増加する
ので永久磁石モータの効率が低下してしまうことにな
る。As shown in FIG. 6, when a rotor core having an embedded magnet structure is reinforced by pins or bolts, the pins or bolts are simply used for the purpose of improving mechanical strength. The insertion position of is set.
Therefore, the holes for inserting the pins or the bolts make the flow of the magnetic flux inside the rotor core of the laminated structure irregular, and the iron loss in the rotor core increases, so that the efficiency of the permanent magnet motor decreases. Will end up.
【０００７】また、かしめ固定、樹脂モールドを採用し
た場合にも同様の不都合が生じる。Further, the same problem occurs when the caulking fixing and the resin molding are adopted.
【０００８】[0008]
【発明の目的】この発明は上記の問題点に鑑みてなされ
たものであり、鉄損の増加を大幅に抑制した状態で積層
構造の回転子鉄心を強固に一体化できる埋込磁石構造の
ブラシレスＤＣモータを提供することを目的としてい
る。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is a brushless structure of an embedded magnet structure capable of firmly integrating a rotor core having a laminated structure in a state where an increase in iron loss is significantly suppressed. It is intended to provide a DC motor.
【０００９】[0009]
【課題を解決するための手段】上記の目的を達成するた
めの、請求項１のブラシレスＤＣモータは、永久磁石が
回転子鉄心の半径方向と直角な方向に向くように埋込ま
れてあり、積層構造の回転子鉄心の磁束変化が少ない所
定位置に回転子の軸と平行な穴が形成されてあるととも
に、穴を貫通する回転子鉄心一体化部材が設けられてあ
るものである。請求項２のブラシレスＤＣモータは、回
転子鉄心一体化部材として磁性体からなるものを用いて
いる。In order to achieve the above object, the brushless DC motor according to claim 1 has a permanent magnet embedded so as to be oriented in a direction perpendicular to the radial direction of the rotor core. A hole parallel to the axis of the rotor is formed at a predetermined position where the change in magnetic flux of the rotor core of the laminated structure is small, and a rotor core integrated member penetrating the hole is provided. A brushless DC motor according to a second aspect of the present invention uses a rotor core integrated member made of a magnetic material.
【００１０】[0010]
【作用】請求項１のブラシレスＤＣモータであれば、回
転子鉄心の所定位置に半径方向と直角な方向に永久磁石
を埋込んだ状態において、回転子内の磁束変化が少ない
所定位置に回転子鉄心一体化部材を挿通するための穴が
形成されているのであるから、穴および回転子鉄心一体
化部材によっては磁束の流れが殆ど乱されない状態にな
る。したがって、回転子鉄心の内部における鉄損の増加
を大幅に抑制でき、ブラシレスＤＣモータの効率を高く
維持できる。According to the brushless DC motor of the first aspect of the present invention, when the permanent magnet is embedded in a predetermined position of the rotor core in a direction perpendicular to the radial direction, the rotor is set at a predetermined position where the magnetic flux change in the rotor is small. Since the hole for inserting the iron core integrated member is formed, the flow of magnetic flux is hardly disturbed by the hole and the rotor iron core integrated member. Therefore, an increase in iron loss inside the rotor core can be significantly suppressed, and the efficiency of the brushless DC motor can be maintained high.
【００１１】請求項２のブラシレスＤＣモータであれ
ば、回転子鉄心一体化部材として磁性体からなるものを
用いているのであるから、回転子鉄心一体化部材に磁束
が通りやすくなるので、回転子鉄心一体化部材の挿通位
置により磁束の流れの乱れが大幅に抑制されるのみなら
ず、回転子鉄心一体化部材により磁束の流れが乱される
場合であっても乱される程度を大幅に低減できる。した
がって、回転子鉄心の内部における鉄損の増加を一層大
幅に抑制でき、ブラシレスＤＣモータの効率を一層高く
維持できる。According to the brushless DC motor of the second aspect, since the rotor iron core-integrating member made of a magnetic material is used, the magnetic flux can easily pass through the rotor iron core-integrating member. Disturbance of the magnetic flux flow is greatly suppressed by the insertion position of the iron core integrated member, and even if the magnetic flux flow is disturbed by the rotor iron integrated member, the degree of disturbance is greatly reduced. it can. Therefore, an increase in iron loss inside the rotor core can be suppressed further significantly, and the efficiency of the brushless DC motor can be maintained higher.
【００１２】[0012]
【実施例】以下、実施例を示す添付図面によって詳細に
説明する。図３はこの発明のブラシレスＤＣモータの一
実施例を示す縦断面図、図２は回転子の構成を示す斜視
図、図１は回転子の構成を示す縦断面図である。ブラシ
レスＤＣモータは図３に示すように、ほぼ円筒状の電機
子鉄心の内面に形成した複数のスリットに電機子巻線を
巻回してなる電機子１と、電機子１の内径よりもやや小
さい外径の回転子鉄心２ａの内部に少なくとも１対（図
示した実施例においては２対）の永久磁石２ｂを埋設し
てなる回転子２とを有している。図１，図２に示す回転
子２は、回転子２の半径方向と直角な方向に永久磁石２
ｂを埋設してあり、隣合う永久磁石２ｂにより発生され
る磁束の短絡を防止するために、永久磁石２ｂの端部か
ら回転子鉄心２ａ外端近傍まで半径方向に延びる磁束短
絡防止用の空隙２ｃを形成してある。そして、上記回転
子鉄心２ａは鉄損を低減するために積層構造とされてお
り、積層された回転子鉄心２ａを強固に一体化するため
に回転子鉄心一体化部材としてのピンまたはボルト２ｄ
を挿通するための穴２ｅが形成されている。図４は回転
子鉄心２ａにおける磁束の流れの一例を示す図であり、
何れかの永久磁石２ｂから出る磁束が回転子鉄心２ａ、
回転子鉄心２ａと電機子鉄心との間隙、電機子鉄心、電
機子鉄心と回転子鉄心２ａとの間隙および回転子鉄心２
ａを通って他の永久磁石２ｂに入っている。そして、電
機子鉄心は回転子鉄心２ａに近接する箇所まで延びる部
分と電機子巻線を巻回するための凹入部分とを交互に有
しているのであるとともに、電機子巻線により形成され
る回転磁界の影響を受けるのであるから、回転子鉄心２
ａの全ての範囲で均一な磁束の流れが形成されるのでは
なく、局部的にかなり偏った磁束の流れが形成される。
したがって、このような磁束の流れに基づいて、磁束の
流れを乱す可能性が最も低い所定位置にピンまたはボル
ト２ｄを挿通するための穴２ｅを形成することにより、
磁束の流れの乱れに起因する鉄損の増加を大幅に抑制で
きる。ここで、磁束の流れを乱す可能性が最も低い所定
位置としては、永久磁石２ｂの中央部と正対する所定位
置が例示できる。Embodiments will now be described in detail with reference to the accompanying drawings showing embodiments. 3 is a vertical sectional view showing an embodiment of the brushless DC motor of the present invention, FIG. 2 is a perspective view showing the structure of the rotor, and FIG. 1 is a vertical sectional view showing the structure of the rotor. As shown in FIG. 3, the brushless DC motor has an armature 1 formed by winding an armature winding around a plurality of slits formed on the inner surface of a substantially cylindrical armature core, and slightly smaller than the inner diameter of the armature 1. The rotor 2 having at least one pair (two pairs in the illustrated embodiment) of permanent magnets 2b is embedded inside a rotor core 2a having an outer diameter. The rotor 2 shown in FIGS. 1 and 2 has a permanent magnet 2 in a direction perpendicular to the radial direction of the rotor 2.
In order to prevent a short circuit of the magnetic flux generated by the permanent magnets 2b adjacent to each other, the air gap for extending from the end of the permanent magnet 2b to the vicinity of the outer end of the rotor iron core 2a in the radial direction for magnetic flux short circuit prevention. 2c is formed. The rotor core 2a has a laminated structure in order to reduce iron loss, and pins or bolts 2d as a rotor core integrated member are formed to firmly integrate the laminated rotor cores 2a.
A hole 2e for inserting the through hole is formed. FIG. 4 is a diagram showing an example of the flow of magnetic flux in the rotor core 2a,
The magnetic flux emitted from one of the permanent magnets 2b is the rotor core 2a,
Gap between rotor core 2a and armature core, armature core, gap between armature core and rotor core 2a, and rotor core 2
It passes through a and enters another permanent magnet 2b. The armature core alternately has a portion extending to a position close to the rotor core 2a and a recessed portion for winding the armature winding, and is formed by the armature winding. The rotor core 2 is affected by the rotating magnetic field.
A uniform magnetic flux flow is not formed in the entire range of a, but a locally locally biased magnetic flux flow is formed.
Therefore, based on such a flow of the magnetic flux, by forming the hole 2e for inserting the pin or the bolt 2d at a predetermined position where the possibility of disturbing the flow of the magnetic flux is lowest,
The increase in iron loss due to the disturbance of the flow of magnetic flux can be greatly suppressed. Here, the predetermined position that is least likely to disturb the flow of the magnetic flux may be a predetermined position that faces the center of the permanent magnet 2b.
【００１３】尚、上記永久磁石２ｂとしてはフェライト
磁石を用いることが可能であるが、希土類磁石を用いる
ことが好ましい。そして、永久磁石２ｂはエポキシ系等
の接着剤を介在させた状態で回転子鉄心２ａの該当する
穴に挿入されている。上記の構成のブラシレスＤＣモー
タであれば、積層構造の回転子鉄心２ａを強固に一体化
するためのピンまたはボルト２ｄを挿通するための穴２
ｅを、上述のように磁束の流れを乱す可能性が最も低い
所定位置に設定しているのであるから、磁束の流れが乱
されることに起因する鉄損の増加を大幅に低減でき、ひ
いてはブラシレスＤＣモータの効率を高く維持できる。It is possible to use a ferrite magnet as the permanent magnet 2b, but it is preferable to use a rare earth magnet. The permanent magnet 2b is inserted into the corresponding hole of the rotor core 2a with an adhesive such as an epoxy intervening. In the case of the brushless DC motor having the above configuration, the hole 2 for inserting the pin or bolt 2d for firmly integrating the rotor core 2a of the laminated structure
Since e is set to the predetermined position where the possibility of disturbing the flow of the magnetic flux is lowest as described above, the increase in iron loss due to the disturbance of the flow of the magnetic flux can be significantly reduced, and The efficiency of the brushless DC motor can be maintained high.
【００１４】次いで、上記の構成の回転子２の製造作業
について説明する。例えば、ケイ素鋼板を永久磁石に対
してすきま嵌め寸法に打抜き、またはワイヤーカット加
工を行なって単位ケイ素鋼板を得る（図５参照）。即
ち、得られた単位ケイ素鋼板は、永久磁石２ｂを挿通す
る穴、磁束短絡防止用の空隙およびピンまたはボルト２
ｄを挿通するための穴２ｅを有している。以上のように
して得られた複数枚の単位ケイ素鋼板を積層して回転子
２の軸に圧入する。そして、積層されたケイ素鋼板の磁
石挿入部に対してエポキシ系接着剤を介在させた状態で
永久磁石２ｂを挿入して接着剤により固定し、次いで、
穴２ｅにピンまたはボルト２ｄを挿通して積層状態の回
転子鉄心２ａを強固に一体化することにより埋込磁石構
造の回転子２を得る。尚、上記エポキシ系接着剤として
は、外径が６０mm程度の回転子の場合に、接着力が１〜
２Kg／mm2 以上のものを用いることが好ましい。Next, a manufacturing operation of the rotor 2 having the above structure will be described. For example, a silicon steel plate is punched into a clearance fitting dimension with respect to a permanent magnet, or wire cutting is performed to obtain a unit silicon steel plate (see FIG. 5). That is, the obtained unit silicon steel plate has a hole through which the permanent magnet 2b is inserted, a gap for preventing a magnetic flux short circuit, and the pin or bolt 2
It has a hole 2e for inserting d. A plurality of unit silicon steel plates obtained as described above are laminated and pressed into the shaft of the rotor 2. Then, the permanent magnet 2b is inserted into the magnet insertion portion of the laminated silicon steel plates with the epoxy adhesive interposed and fixed by the adhesive, and then,
The pin 2 or the bolt 2d is inserted into the hole 2e to firmly integrate the laminated rotor core 2a to obtain the rotor 2 having the embedded magnet structure. In addition, as the above-mentioned epoxy adhesive, when the outer diameter is about 60 mm, the adhesive force is 1 to
It is preferable to use one having a pressure of 2 kg / mm 2 or more.
【００１５】以上の説明から明らかなように、単位ケイ
素鋼板に形成すべき開口としては永久磁石２ｂを挿入す
る部分、空隙２ｃおよびピンまたはボルト２ｄを挿通す
るための穴２ｅのみでよいから、製造作業が特別に繁雑
化するという不都合はない。上記ピンまたはボルト２ｄ
については、従来は渦電流を防止するために非磁性体か
らなるものを用いなければならないと思われていたので
あるが、本願発明者が鋭意研究を進めた結果、磁性体か
らなるピンまたはボルト２ｄを用いてもさほど大きな渦
電流が流れず、かえって磁性体からなるピンまたはボル
ト２ｄの内部を磁束が流れる結果、磁束の流れの乱れを
抑制できることを見出した。したがって、上記ピンまた
はボルト２ｄとして非磁性体からなるものを用いても特
には不都合がないが、磁性体からなるものを用いること
が好ましく、磁束の流れの乱れに起因する鉄損の増加を
一層低減できる。As is clear from the above description, the openings to be formed in the unit silicon steel sheet are only the portion for inserting the permanent magnet 2b, the void 2c, and the hole 2e for inserting the pin or bolt 2d. There is no inconvenience that the work is particularly complicated. The above pin or bolt 2d
With regard to the above, it has been conventionally thought that a non-magnetic material must be used to prevent eddy currents. However, as a result of intensive research by the inventor of the present application, a pin or bolt made of a magnetic material has been developed. It has been found that even if 2d is used, a large eddy current does not flow, and instead the magnetic flux flows inside the pin or bolt 2d made of a magnetic material, and as a result, disturbance of the magnetic flux flow can be suppressed. Therefore, although it is not particularly inconvenient to use the pin or bolt 2d made of a non-magnetic material, it is preferable to use a material made of a magnetic material to further increase the iron loss due to the disturbance of the magnetic flux flow. Can be reduced.
【００１６】[0016]
【発明の効果】以上のように請求項１の発明は、積層構
造の回転子鉄心を強固に一体化するための回転子鉄心一
体化部材の挿通位置を回転子内の磁束変化の少ない所定
位置に設定しているので、磁束の流れの乱れに起因する
鉄損の増加を大幅に抑制でき、ブラシレスＤＣモータの
高効率化を達成できるという特有の効果を奏する。As described above, according to the first aspect of the invention, the insertion position of the rotor core integrated member for firmly integrating the rotor core of the laminated structure is set to the predetermined position where the magnetic flux change in the rotor is small. Since it is set to 1, the increase in iron loss due to the turbulence of the flow of magnetic flux can be significantly suppressed, and a high efficiency of the brushless DC motor can be achieved.
【００１７】請求項２の発明は、回転子鉄心一体化部材
が磁性体からなるものであるから、回転子鉄心一体化部
材の内部にも磁束が流れることになり、磁束の流れの乱
れを一層低減できるので、磁束の流れの乱れに起因する
鉄損の増加を一層大幅に抑制でき、ブラシレスＤＣモー
タの一層の高効率化を達成できるという特有の効果を奏
する。According to the second aspect of the present invention, since the rotor core integrated member is made of a magnetic material, magnetic flux also flows inside the rotor core integrated member, further disturbing the flow of magnetic flux. Since it can be reduced, the increase in iron loss due to the turbulence of the flow of magnetic flux can be further significantly suppressed, and the unique effect that the efficiency of the brushless DC motor can be further enhanced can be achieved.
【００１８】[0018]
【図１】この発明のブラシレスＤＣモータの一実施例に
おける回転子の構成を示す縦断面図である。FIG. 1 is a vertical sectional view showing the structure of a rotor in an embodiment of a brushless DC motor of the present invention.
【００１９】[0019]
【図２】この発明のブラシレスＤＣモータの一実施例に
おける回転子を示す斜視図である。FIG. 2 is a perspective view showing a rotor in one embodiment of the brushless DC motor of the present invention.
【００２０】[0020]
【図３】この発明のブラシレスＤＣモータの一実施例を
概略的に示す縦断面図である。FIG. 3 is a vertical sectional view schematically showing an embodiment of the brushless DC motor of the present invention.
【００２１】[0021]
【図４】ブラシレスＤＣモータにおける磁束の流れを示
す概略図である。FIG. 4 is a schematic diagram showing the flow of magnetic flux in a brushless DC motor.
【００２２】[0022]
【図５】単位ケイ素鋼板を示す平面図である。FIG. 5 is a plan view showing a unit silicon steel sheet.
【００２３】[0023]
【図６】埋込磁石構造の回転子の一例を示す概略図であ
る。FIG. 6 is a schematic view showing an example of a rotor having an embedded magnet structure.
【００２４】[0024]
１ 電機子 ２ 回転子 ２ａ 回転子鉄心 ２
ｂ 永久磁石 ２ｄ 回転子鉄心一体化部材としてのピンまたはボルト
２ｅ 穴1 armature 2 rotor 2a rotor core 2
b Permanent magnet 2d Pin or bolt as rotor core integrated member 2e Hole
Claims (2)
電機子（１）と積層構造の回転子鉄心（２ａ）に永久磁
石（２ｂ）を埋込んでなる回転子（２）とを含むブラシ
レスＤＣモータであって、永久磁石（２ｂ）が回転子鉄
心（２ａ）の半径方向と直角な方向に向くように埋込ま
れてあり、積層構造の回転子鉄心（２ａ）の磁束変化が
少ない所定位置に回転子（２）の軸と平行な穴（２ｅ）
が形成されてあるとともに、穴（２ｅ）を貫通する回転
子鉄心一体化部材（２ｄ）が設けられてあることを特徴
とするブラシレスＤＣモータ。1. An armature (1) having an armature winding wound around an armature core, and a rotor (2) having a permanent magnet (2b) embedded in a laminated rotor core (2a). A brushless DC motor including: a permanent magnet (2b) embedded so as to face in a direction perpendicular to the radial direction of the rotor core (2a), and a magnetic flux change of the rotor core (2a) having a laminated structure. Holes (2e) parallel to the axis of the rotor (2)
And a rotor core integral member (2d) penetrating the hole (2e) is provided.
からなるものである請求項１に記載のブラシレスＤＣモ
ータ。2. The brushless DC motor according to claim 1, wherein the rotor core integrated member (2d) is made of a magnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4033248A JPH05236686A (en) | 1992-02-20 | 1992-02-20 | Brushless cd motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4033248A JPH05236686A (en) | 1992-02-20 | 1992-02-20 | Brushless cd motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05236686A true JPH05236686A (en) | 1993-09-10 |
Family
ID=12381188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4033248A Pending JPH05236686A (en) | 1992-02-20 | 1992-02-20 | Brushless cd motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05236686A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10126986A (en) * | 1996-10-23 | 1998-05-15 | Matsushita Electric Ind Co Ltd | Permanent magnet rotor |
| US6445100B2 (en) | 1996-03-21 | 2002-09-03 | Hitachi, Ltd. | Permanent magnet dynamo electric machine |
| WO2003079516A1 (en) * | 2002-03-20 | 2003-09-25 | Daikin Industries, Ltd. | Permanent magnet type motor and compressor comprising it |
| US7042127B2 (en) | 2003-04-02 | 2006-05-09 | Nidec Sankyo Corporation | Permanent magnet embedded motor |
| US7230359B2 (en) | 2002-03-22 | 2007-06-12 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Electric motor with poles shaped to minimize cogging torque |
| JP2007306726A (en) * | 2006-05-12 | 2007-11-22 | Mitsubishi Electric Corp | Magnet-embedded rotator and molding die |
| JP2008113524A (en) * | 2006-10-31 | 2008-05-15 | Toshiba Corp | Axial-gap coreless motor and positioning device |
| US7843101B2 (en) | 2005-12-01 | 2010-11-30 | Aichi Elec Co. | Interior permanent magnet electric motor including a rotor having circumferential surface portions with defined curve profiles |
| JP2011172359A (en) * | 2010-02-17 | 2011-09-01 | Nippon Steel Corp | Split rotor and electric motor |
-
1992
- 1992-02-20 JP JP4033248A patent/JPH05236686A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6445100B2 (en) | 1996-03-21 | 2002-09-03 | Hitachi, Ltd. | Permanent magnet dynamo electric machine |
| JPH10126986A (en) * | 1996-10-23 | 1998-05-15 | Matsushita Electric Ind Co Ltd | Permanent magnet rotor |
| WO2003079516A1 (en) * | 2002-03-20 | 2003-09-25 | Daikin Industries, Ltd. | Permanent magnet type motor and compressor comprising it |
| US6849981B2 (en) | 2002-03-20 | 2005-02-01 | Daikin Industries, Ltd. | Permanent magnet type motor and compressor comprising it |
| JPWO2003079516A1 (en) * | 2002-03-20 | 2005-07-21 | ダイキン工業株式会社 | Permanent magnet type electric motor and compressor using the same |
| US7230359B2 (en) | 2002-03-22 | 2007-06-12 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Electric motor with poles shaped to minimize cogging torque |
| US7042127B2 (en) | 2003-04-02 | 2006-05-09 | Nidec Sankyo Corporation | Permanent magnet embedded motor |
| US7843101B2 (en) | 2005-12-01 | 2010-11-30 | Aichi Elec Co. | Interior permanent magnet electric motor including a rotor having circumferential surface portions with defined curve profiles |
| JP2007306726A (en) * | 2006-05-12 | 2007-11-22 | Mitsubishi Electric Corp | Magnet-embedded rotator and molding die |
| JP2008113524A (en) * | 2006-10-31 | 2008-05-15 | Toshiba Corp | Axial-gap coreless motor and positioning device |
| JP2011172359A (en) * | 2010-02-17 | 2011-09-01 | Nippon Steel Corp | Split rotor and electric motor |
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