JP2001178037A - Permanent-magnet dynamo-electric machine - Google Patents
Permanent-magnet dynamo-electric machineInfo
- Publication number
- JP2001178037A JP2001178037A JP35387599A JP35387599A JP2001178037A JP 2001178037 A JP2001178037 A JP 2001178037A JP 35387599 A JP35387599 A JP 35387599A JP 35387599 A JP35387599 A JP 35387599A JP 2001178037 A JP2001178037 A JP 2001178037A
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- electric machine
- diameter side
- rotor core
- rotating electric
- 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
- Iron Core Of Rotating Electric Machines (AREA)
- Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、回転子鉄心に複数
の永久磁石を備えている永久磁石式回転電機に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet type rotating electric machine having a rotor core having a plurality of permanent magnets.
【0002】[0002]
【従来の技術】従来、永久磁石式回転電機は、永久磁石
に様々な形状が採用されている。例えば、特開平6−339
241 号公報記載の永久磁石式回転電機においては、回転
子鉄心に形成された複数の永久磁石挿入孔中に納められ
た永久磁石の断面形状を弧状となるアーク形に形成し、
これら永久磁石の凸部側を回転子鉄心の内径側を向くよ
うに配置し、特性向上を図っている。また、特開平6−3
39238 号公報記載の永久磁石式回転電機においては、回
転子鉄心に形成された複数の永久磁石挿入孔中に納めら
れた永久磁石の断面形状を、回転子鉄心の内径側に凸と
なる円弧状と、外径側をコ字状に形成し、コギングトル
クの低減を図っている。2. Description of the Related Art Conventionally, permanent magnet rotary electric machines employ various shapes for permanent magnets. For example, JP-A-6-339
In the permanent magnet type rotating electric machine described in Japanese Patent No. 241, the cross-sectional shape of the permanent magnet accommodated in the plurality of permanent magnet insertion holes formed in the rotor core is formed in an arc shape in which the arc is formed.
The protrusions of these permanent magnets are arranged so as to face the inner diameter side of the rotor iron core to improve the characteristics. Also, JP-A-6-3
In the permanent magnet type rotating electric machine described in Japanese Patent No. 39238, the cross-sectional shape of the permanent magnet accommodated in a plurality of permanent magnet insertion holes formed in the rotor core is formed in an arc shape that is convex toward the inner diameter side of the rotor core. The outer diameter side is formed in a U-shape to reduce the cogging torque.
【0003】[0003]
【発明が解決しようとする課題】上記従来技術は、永久
磁石の断面形状の凸部側を回転子鉄心の内径側を向くよ
うに配置しているため、特性向上やコギングトルクの低
減が図れる反面、電機子巻線と対向する位置に回転子鉄
心が存在するため、電機子電流が作る電機子反作用磁束
が多く発生し、電機子電流の増加に従って振動・騒音が
大きくなる課題がある。In the above prior art, the convex portion of the cross section of the permanent magnet is arranged so as to face the inner diameter side of the rotor core, so that the characteristics can be improved and the cogging torque can be reduced. However, since the rotor core exists at a position facing the armature winding, a large amount of armature reaction magnetic flux generated by the armature current is generated, and there is a problem that vibration and noise increase as the armature current increases.
【0004】本発明は以上の点に鑑みなされたものであ
る。本発明の目的は、電機子電流の増加に従って振動・
騒音が大きくなることがない永久磁石式回転電機を提供
することにある。The present invention has been made in view of the above points. It is an object of the present invention to oscillate as the armature current increases.
An object of the present invention is to provide a permanent magnet type rotating electric machine that does not increase noise.
【0005】[0005]
【課題を解決するための手段】上記目的は、固定子鉄心
に形成された複数のスロット中に電機子巻線が施された
固定子と、回転子鉄心に形成された複数の永久磁石挿入
孔中に永久磁石が納められた回転子とを有する永久磁石
式回転電機において、永久磁石の形状を、回転子鉄心の
外径側に向かって凸形の略円弧状に形成するとともに、
該回転子鉄心の内径側に向かって凸形の略円弧状に形成
することにより、達成される。SUMMARY OF THE INVENTION An object of the present invention is to provide a stator in which an armature winding is provided in a plurality of slots formed in a stator core, and a plurality of permanent magnet insertion holes formed in a rotor core. In a permanent magnet type rotating electric machine having a rotor in which a permanent magnet is housed, the shape of the permanent magnet is formed in a substantially arc shape convex toward the outer diameter side of the rotor core,
This is achieved by forming the rotor core in a substantially arc shape that is convex toward the inner diameter side of the rotor core.
【0006】電機子電流はトルク電流になり、電機子電
流の大きさが出力の大きさを左右する。特性上は電機子
電流による磁束を多く発生するようにした方が良いこと
から、従来技術に示されるように、電機子巻線と対抗す
る位置に電機子側の回転子鉄心が存在させ、リラクタン
ストルクを有効利用する方法が採用されている。しか
し、本願発明者らは、電機子巻線が作る磁束は固定子と
回転子間のギャップに脈動磁束となり、電機子電流の増
加によって転流リプル磁束を増加させ、電機子電流の増
加とともに振動・騒音が増大する技術課題を発見した。
本発明はこれを解消するものであり、永久磁石の形状
を、回転子鉄心の外径側に向かって凸形の略円弧状に形
成するとともに、該回転子鉄心の内径側に向かって凸形
の略円弧状に形成することにより、回転子外径側の鉄心
部、いわゆるブリッジを薄くし、かつ磁石厚を厚くした
ので、磁石磁束によるトルクを増大させ、かつ電機子電
流の作る電機子反作用磁束を小さくしているので、回転
電機の発生トルクを減少させることなく、振動・騒音を
低減できる。[0006] The armature current becomes a torque current, and the magnitude of the armature current affects the magnitude of the output. From the viewpoint of characteristics, it is better to generate a large amount of magnetic flux due to the armature current.Therefore, as shown in the prior art, a rotor core on the armature side exists at a position opposing the armature winding, and the reluctance A method that effectively utilizes the torque is adopted. However, the present inventors have found that the magnetic flux created by the armature winding becomes pulsating magnetic flux in the gap between the stator and the rotor, and the commutation ripple magnetic flux increases due to the increase in the armature current.・ Discovered a technical issue that increases noise.
The present invention has been made to solve this problem, and the shape of the permanent magnet is formed in a substantially arc shape that is convex toward the outer diameter side of the rotor core, and is convex toward the inner diameter side of the rotor core. By forming the iron core on the outer diameter side of the rotor, the so-called bridge, and making the magnet thicker by forming a substantially arc shape of the above, the torque due to the magnet flux is increased, and the armature reaction created by the armature current Since the magnetic flux is reduced, vibration and noise can be reduced without reducing the torque generated by the rotating electric machine.
【0007】[0007]
【発明の実施の形態】以下、本発明の実施例を図1〜図
8を用いて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
【0008】図1は、本発明の一実施例に係る永久磁石
式回転電機の径方向断面形状を示す図である。図1に示
すように、永久磁石式回転電機1は固定子6と回転子7
を有する。固定子6は、固定子鉄心2の複数のティース
3とともに形成した複数のスロット4内に電機子巻線5
(U相巻線5A,V相巻線5B,W相巻線5Cの分布巻
からなる)を巻装して構成される。回転子7は、回転子
鉄心8中に設けた永久磁石挿入孔9中に配置された永久
磁石10(ここでは4極で示した)とシャフト(図示せ
ず)に嵌合するためのシャフト嵌合孔11とからなる。FIG. 1 is a diagram showing a radial cross-sectional shape of a permanent magnet type rotating electric machine according to one embodiment of the present invention. As shown in FIG. 1, a permanent magnet type rotating electric machine 1 includes a stator 6 and a rotor 7.
Having. The stator 6 includes armature windings 5 in a plurality of slots 4 formed with a plurality of teeth 3 of the stator core 2.
(Distributed winding of the U-phase winding 5A, the V-phase winding 5B, and the W-phase winding 5C). The rotor 7 has a permanent magnet 10 (shown here with four poles) arranged in a permanent magnet insertion hole 9 provided in the rotor core 8 and a shaft fitting for fitting to a shaft (not shown). And a hole 11.
【0009】図1において、永久磁石10は以下のよう
に形成している。永久磁石10は外径側に凸形の略円弧
状と内径側に凸形の略円弧状を成し、d軸(磁極中心の
軸を差す)(??図中に記載が無いですが、加入しますか
?回答:加入お願いいたします。)側を最も厚く形成し
ている。ここで、凸形の定義は凸レンズの形状にリンク
し、d軸と直交する線上で極間よりd軸側の厚みが厚い
場合を言う。この結果、磁極間鉄心13の周方向幅は外
径側が広く、内径側が狭くなる。そして、d軸の磁石厚
みをLmとし、ティース3の長さLtとしたとき、Lm
/Lt>1.3の関係に設定している。ここで、ティー
ス3の長さLtは同一径であるとスロット4の面積を左
右し、言い換えれば電機子巻線5の巻回数、すなわち電
機子反作用の大きさに比例する。逆に考えれば、Lm/
Lt>1.3 の関係は電機子反作用に打ち勝つ十分な永
久磁石10の磁石厚みを確保し、電機子反作用の影響を
軽減できることになる。In FIG. 1, the permanent magnet 10 is formed as follows. The permanent magnet 10 has a substantially arc shape that is convex on the outer diameter side and a substantially arc shape that is convex on the inner diameter side, and the d-axis (the axis of the magnetic pole is inserted) (?? Answer: Please join.) The side is the thickest. Here, the definition of the convex shape is linked to the shape of the convex lens, and refers to a case where the thickness on the d-axis side is greater than the distance between the poles on a line orthogonal to the d-axis. As a result, the circumferential width of the core 13 between the magnetic poles is large on the outside diameter side and narrow on the inside diameter side. When the thickness of the d-axis magnet is Lm and the length of the teeth 3 is Lt, Lm
/Lt>1.3. Here, the length Lt of the teeth 3 affects the area of the slot 4 if they have the same diameter. In other words, the length Lt is proportional to the number of turns of the armature winding 5, that is, the magnitude of the armature reaction. Conversely, Lm /
The relationship of Lt> 1.3 ensures a sufficient magnet thickness of the permanent magnet 10 to overcome the armature reaction, and reduces the effect of the armature reaction.
【0010】また、永久磁石10の外径側に凸形の略円
弧状の周長をLu、内径側に凸形の略円弧状の周長をL
bとしたとき、Lb>Luの関係に設定し、永久磁石1
0の磁束を有効利用するように設定している。これによ
り、永久磁石10の磁束によるトルクを増加できる。Further, the outer circumference of the permanent magnet 10 has a substantially arc-shaped perimeter convex on the outer diameter side, and the substantially arc-shaped perimeter of the protrusion protruding on the inner diameter side has a length L.
b, the relationship of Lb> Lu is set, and the permanent magnet 1
The setting is such that the magnetic flux of 0 is used effectively. Thereby, the torque by the magnetic flux of the permanent magnet 10 can be increased.
【0011】以上のような永久磁石10の磁石形状を有
する永久磁石式回転電機1において、電機子巻線5にト
ルク発生電流を供給した場合、電機子反作用磁束φag
(図示せず)が通る経路は永久磁石10の外径側のブリ
ッジ部12と永久磁石10間の磁極間鉄心13のみとな
る。なお、ブリッジ部12の径方向厚みWbは、型の精
度,寿命を考慮して、最小を鉄心材の板厚の85%以上
に設定している。例えば、鉄心材の板厚0.5mmのとき
は0.43mmに設定している。このため、電機子電流が
電機子巻線5に流れると電機子反作用磁束φagが発生
するが、ブリッジ部12と磁極間鉄心13が磁路断面積
が小さいので即磁気飽和に至り、これ以上の電機子電流
を流しても固定子6と回転子7間のギャップ磁束密度が
変化せず、電機子電流を増加して振動・騒音の増大を防
止できる。In the permanent magnet type rotating electric machine 1 having the permanent magnet 10 as described above, when a torque generating current is supplied to the armature winding 5, the armature reaction magnetic flux φag
A path (not shown) passes through only the bridge portion 12 on the outer diameter side of the permanent magnet 10 and the core 13 between the magnetic poles between the permanent magnets 10. The minimum thickness Wb of the bridge portion 12 in the radial direction is set to 85% or more of the thickness of the iron core material in consideration of the accuracy and life of the mold. For example, when the thickness of the iron core material is 0.5 mm, it is set to 0.43 mm. Therefore, when an armature current flows through the armature winding 5, an armature reaction magnetic flux φag is generated. However, since the bridge section 12 and the core 13 between the magnetic poles have a small magnetic path cross-sectional area, magnetic saturation occurs immediately. Even when an armature current is passed, the gap magnetic flux density between the stator 6 and the rotor 7 does not change, and the armature current is increased, thereby preventing an increase in vibration and noise.
【0012】図2は、本発明の一実施例に係る永久磁石
式回転電機の回転子軸方向断面形状を示す図である。図
3は、本発明の一実施例に係る永久磁石式回転電機の回
転子鉄心形状を示す図である。図3(a)は、図2のA
−A′における断面形状を示す。図3(b)は、図2の
B−B′における断面形状を示す。図2及び図3に示す
ように、回転子7は永久磁石挿入孔9中に配置された永
久磁石10と外径d1のシャフト嵌合孔11からなる回
転子鉄心8と、永久磁石挿入孔9中に配置された永久磁
石10と外径d2のボス孔15からなるボス回転子鉄心
14からなる。そして、ボス回転子鉄心14のボス孔1
5との最小厚み(図2または図3中のt)を2mm以下に設
定している。これにより、ボス孔15を設けても磁石厚
みLmとティース3の長さLtとをLm/Lt>1.3
の関係に満足でき、図1に示した効果を得ることができ
る。なお、ボス孔15を形成したのは、圧縮機(図示せ
ず)に本発明の永久磁石式回転電機1を適用できるよう
にするためである。FIG. 2 is a diagram showing a sectional shape in the rotor axial direction of a permanent magnet type rotating electric machine according to one embodiment of the present invention. FIG. 3 is a view showing a rotor core shape of the permanent magnet type rotating electric machine according to one embodiment of the present invention. FIG.
The sectional shape at -A 'is shown. FIG. 3B shows a cross-sectional shape taken along the line BB ′ of FIG. As shown in FIGS. 2 and 3, the rotor 7 includes a rotor core 8 including a permanent magnet 10 disposed in the permanent magnet insertion hole 9 and a shaft fitting hole 11 having an outer diameter d1; The boss rotor core 14 includes a permanent magnet 10 disposed therein and a boss hole 15 having an outer diameter d2. And the boss hole 1 of the boss rotor core 14
5 (t in FIG. 2 or FIG. 3) is set to 2 mm or less. Thereby, even if the boss hole 15 is provided, the magnet thickness Lm and the length Lt of the teeth 3 are set to be Lm / Lt> 1.3.
And the effect shown in FIG. 1 can be obtained. Note that the boss holes 15 are formed so that the permanent magnet type rotating electric machine 1 of the present invention can be applied to a compressor (not shown).
【0013】図4は、本発明の他の実施例に係る永久磁
石式回転電機の径方向断面形状を示す図である。図4に
おいて、図1と同一物又は相当物には同一符号を付し
た。図4が、図1と異なるのは回転子7の構成である。
すなわち、回転子7は回転子鉄心8中に設けた永久磁石
挿入孔9中に配置された永久磁石16とシャフト嵌合孔
11からなる。永久磁石16は外径側に凸形の略円弧状
と内径側に凸形の略円弧状を成し、d軸側を最も厚く形
成しているが、外径側に凸形の略円弧状の径を小さくし
ている結果、d軸のブリッジ部厚みWb1に対し極間の
ブリッジ部厚みWb2が大きくなるため、極間にスリッ
ト17を設けたものである。この結果、電機子巻線5に
トルク発生電流を供給した場合、電機子反作用磁束φa
g(図示せず)が通る経路は永久磁石10の外径側のブ
リッジ部12のみとなる。そのため、電機子電流が電機
子巻線5に流れると電機子反作用磁束φagが発生する
が、ブリッジ部12の磁路断面積が小さいので即磁気飽
和に至り、これ以上の電機子電流を流しても固定子6と
回転子7間のギャップ磁束密度が変化せず、電機子電流
を増加して振動・騒音の増大を防止できる。図示してい
ないが、図4の構成で、図2に示したボス回転子鉄心1
4を設けても良い。FIG. 4 is a diagram showing a radial cross section of a permanent magnet type rotating electric machine according to another embodiment of the present invention. 4, the same reference numerals are given to the same or equivalent components as those in FIG. FIG. 4 differs from FIG. 1 in the configuration of the rotor 7.
That is, the rotor 7 includes the permanent magnet 16 and the shaft fitting hole 11 arranged in the permanent magnet insertion hole 9 provided in the rotor core 8. The permanent magnet 16 has a substantially arc shape that is convex on the outer diameter side and a substantially arc shape that is convex on the inner diameter side, and has the thickest d-axis side, but has a substantially arc shape that is convex on the outer diameter side. Is reduced, the bridge thickness Wb2 between the poles is larger than the bridge thickness Wb1 on the d-axis, so that the slit 17 is provided between the poles. As a result, when a torque generating current is supplied to the armature winding 5, the armature reaction magnetic flux φa
The path through which g (not shown) passes is only the bridge portion 12 on the outer diameter side of the permanent magnet 10. Therefore, when the armature current flows through the armature winding 5, an armature reaction magnetic flux φag is generated. However, since the magnetic path cross-sectional area of the bridge portion 12 is small, magnetic saturation occurs immediately, and an armature current larger than that is passed. Also, the gap magnetic flux density between the stator 6 and the rotor 7 does not change, and the armature current can be increased to prevent an increase in vibration and noise. Although not shown, the boss rotor core 1 shown in FIG.
4 may be provided.
【0014】図5は、本発明のその他の実施例に係る永
久磁石式回転電機の径方向断面図を示す。図5におい
て、図1と同一物又は相当物には同一符号を付した。図
5が、図1と異なるのは回転子7の構成である。すなわ
ち、回転子7は回転子鉄心8中に設けた永久磁石挿入孔
9中に配置された永久磁石18とシャフト嵌合孔11か
らなる。永久磁石18は外径側に凸形の略円弧状と内径
側に凸形のコ字状形状を成し、d軸(??図中に記載が
無いですが、加入しますか?回答:加入お願いいたしま
す。)側を最も厚く形成している。この結果、磁極間鉄
心13の周方向幅は外径側が広く、内径側が狭くなる。
そして、d軸の磁石厚みをLmとし、ティース3の長さ
Ltとしたとき、Lm/Lt>1.3 の関係に設定して
いる。これより、Lm/Lt>1.3 の関係は電機子反
作用に打ち勝つ十分な磁石厚みを確保し、電機子反作用
の影響を軽減できることになる。FIG. 5 is a radial sectional view of a permanent magnet type rotating electric machine according to another embodiment of the present invention. In FIG. 5, the same or corresponding components as those in FIG. 1 are denoted by the same reference numerals. FIG. 5 differs from FIG. 1 in the configuration of the rotor 7. That is, the rotor 7 includes a permanent magnet 18 and a shaft fitting hole 11 arranged in a permanent magnet insertion hole 9 provided in the rotor core 8. The permanent magnet 18 has a substantially arc shape with a convex shape on the outer diameter side and a U-shape with a convex shape on the inner diameter side, and the d axis (?? is not shown in the figure. Please join.) The side is the thickest. As a result, the circumferential width of the core 13 between the magnetic poles is large on the outside diameter side and narrow on the inside diameter side.
When the thickness of the d-axis magnet is Lm and the length of the teeth 3 is Lt, the relationship of Lm / Lt> 1.3 is set. Thus, the relationship of Lm / Lt> 1.3 ensures a sufficient magnet thickness to overcome the armature reaction and reduces the effect of the armature reaction.
【0015】また、永久磁石18の外径側に凸形の略円
弧状の周長をLu,内径側に凸形のコ字状形状の周長を
Lbとしたとき、Lb>Luの関係に設定し、永久磁石
18の磁束を有効利用するように設定しているので、永
久磁石18の磁束によるトルクを増加できる。When the outer circumference of the permanent magnet 18 has a substantially arc-shaped circumference protruding toward the outer diameter side of Lu, and the circumference of the U-shape convexly formed on the inner diameter side is Lb, the relationship of Lb> Lu is satisfied. Since the setting is made so that the magnetic flux of the permanent magnet 18 is effectively used, the torque due to the magnetic flux of the permanent magnet 18 can be increased.
【0016】以上のような磁石形状を有する永久磁石式
回転電機1において、電機子巻線5にトルク発生電流を
供給した場合、電機子反作用磁束φag(図示せず)が
通る経路は永久磁石18の外径側のブリッジ部12と永
久磁石18間の磁極間鉄心13のみとなる。このため、
電機子電流が電機子巻線5に流れると電機子反作用磁束
φagが発生するが、ブリッジ部12と磁極間鉄心13
が磁路断面積が小さいので即磁気飽和に至り、これ以上
の電機子電流を流しても固定子6と回転子7間のギャッ
プ磁束密度が変化せず、電機子電流を増加して振動・騒
音の増大を防止できる。In the permanent magnet type rotating electric machine 1 having the above-described magnet shape, when a torque generating current is supplied to the armature winding 5, the path through which the armature reaction magnetic flux φag (not shown) passes is a permanent magnet 18. Only the core 13 between the magnetic poles between the bridge portion 12 on the outer diameter side and the permanent magnet 18. For this reason,
When an armature current flows through the armature winding 5, an armature reaction magnetic flux φag is generated.
However, since the magnetic path cross-sectional area is small, magnetic saturation is immediately reached, and even when an armature current is further applied, the gap magnetic flux density between the stator 6 and the rotor 7 does not change. Noise can be prevented from increasing.
【0017】図6は、本発明のさらに他の実施例に係る
永久磁石式回転電機の径方向断面図を示す。図6におい
て、図1と同一物又は相当物には同一符号を付した。図
6が、図1と異なるのは回転子7の構成である。すなわ
ち、回転子7は回転子鉄心8中に設けた永久磁石挿入孔
9中に配置された永久磁石19とシャフト嵌合孔11か
らなる。永久磁石19は外径側に凸形の略円弧状と内径
側に凸形のコ字状形状を成し、d軸側を最も厚く形成し
ているが、外径側に凸形の略円弧状の径を小さくしてい
る結果、d軸のブリッジ部厚みWb1に対し極間のブリ
ッジ部厚みWb2が大きくなるため、極間にスリット17
を設けたものである。この結果、電機子巻線5にトルク
発生電流を供給した場合、電機子反作用磁束φag(図
示せず)が通る経路は永久磁石19の外径側のブリッジ
部12のみとなるため、電機子電流が電機子巻線5に流
れると電機子反作用磁束φagが発生する。しかし、ブ
リッジ部12の磁路断面積が小さいので即磁気飽和に至
り、これ以上の電機子電流を流しても固定子6と回転子
7間のギャップ磁束密度が変化せず、電機子電流を増加
して振動・騒音の増大を防止できる。図示していない
が、図6の構成で、図2に示したボス回転子鉄心を設け
ても良い。FIG. 6 is a radial sectional view of a permanent magnet type rotating electric machine according to still another embodiment of the present invention. 6, the same reference numerals are given to the same or equivalent components as those in FIG. FIG. 6 differs from FIG. 1 in the configuration of the rotor 7. That is, the rotor 7 includes the permanent magnet 19 and the shaft fitting hole 11 arranged in the permanent magnet insertion hole 9 provided in the rotor core 8. The permanent magnet 19 has a substantially arc shape that is convex on the outer diameter side and a U-shape that is convex on the inner diameter side, and has the thickest d-axis side, but has a substantially circular shape that is convex on the outer diameter side. As a result of reducing the arc-shaped diameter, the bridge portion thickness Wb2 between the poles becomes larger than the bridge portion thickness Wb1 on the d-axis, so that the slit 17
Is provided. As a result, when a torque generating current is supplied to the armature winding 5, the path through which the armature reaction magnetic flux φag (not shown) passes is only the bridge portion 12 on the outer diameter side of the permanent magnet 19. Flows through the armature winding 5, an armature reaction magnetic flux φag is generated. However, since the magnetic path cross-sectional area of the bridge portion 12 is small, magnetic saturation occurs immediately, and even when an armature current exceeding this value flows, the gap magnetic flux density between the stator 6 and the rotor 7 does not change. It is possible to prevent increase in vibration and noise. Although not shown, the boss rotor core shown in FIG. 2 may be provided in the configuration of FIG.
【0018】図7は、本発明のさらに他の実施例に係る
集中巻の永久磁石式回転電機の径方向断面図を示す。図
7において、図1と同一物又は相当物には同一符号を付
した。図7が、図1と異なるのは固定子6の構成であ
る。すなわち、固定子6は固定子鉄心2のティース3を
囲むようにスロット4内に集中巻の電機子巻線5(U相
巻線5A,V相巻線5B,W相巻線5C)を巻装したも
のである。集中巻は分布巻に比してコイルエンド長を短
くできるので、図1の効果と共に銅損を低減でき、永久
磁石式回転電機1の特性を向上できる。図示していない
が、図7の構成で、図2に示したボス回転子鉄心を設け
ても良い。FIG. 7 is a radial sectional view of a concentrated winding permanent magnet type rotating electric machine according to still another embodiment of the present invention. 7, the same or equivalent components as those in FIG. 1 are denoted by the same reference numerals. FIG. 7 differs from FIG. 1 in the configuration of the stator 6. That is, the stator 6 winds concentrated armature windings 5 (U-phase windings 5A, V-phase windings 5B, W-phase windings 5C) in the slots 4 so as to surround the teeth 3 of the stator core 2. It was dressed. The concentrated winding can shorten the coil end length as compared with the distributed winding, so that the copper loss can be reduced together with the effect of FIG. 1 and the characteristics of the permanent magnet type rotating electric machine 1 can be improved. Although not shown, the boss rotor core shown in FIG. 2 may be provided in the configuration of FIG.
【0019】図8は、本発明のさらに他の実施例に係る
集中巻の永久磁石式回転電機の径方向断面図を示す。図
8において、図5と同一物又は相当物には同一符号を付
した。図8が、図5と異なるのは固定子6の構成であ
る。すなわち、固定子6は固定子鉄心2のティース3を
囲むようにスロット4内に集中巻の電機子巻線5(U相
巻線5A,V相巻線5B,W相巻線5C)を巻装したも
のである。集中巻は分布巻に比してコイルエンド長を短
くできるので、図1の効果と共に銅損を低減でき、永久
磁石式回転電機1の特性を向上できる。図示していない
が、図8の構成で、図2に示したボス回転子鉄心を設け
ても良いことは言うまでもない。FIG. 8 is a radial sectional view of a concentrated winding permanent magnet type rotating electric machine according to still another embodiment of the present invention. In FIG. 8, the same or corresponding components as those in FIG. 5 are denoted by the same reference numerals. FIG. 8 differs from FIG. 5 in the configuration of the stator 6. That is, the stator 6 winds concentrated armature windings 5 (U-phase windings 5A, V-phase windings 5B, W-phase windings 5C) in the slots 4 so as to surround the teeth 3 of the stator core 2. It was dressed. The concentrated winding can shorten the coil end length as compared with the distributed winding, so that the copper loss can be reduced together with the effect of FIG. 1 and the characteristics of the permanent magnet type rotating electric machine 1 can be improved. Although not shown, it goes without saying that the boss rotor core shown in FIG. 2 may be provided in the configuration of FIG.
【0020】以上詳述したように、永久磁石の形状を、
回転子鉄心の外径側に向かって凸形の略円弧状に形成す
るとともに、該回転子鉄心の内径側に向かって凸形の略
円弧状に形成することにより、回転子外径側の鉄心部、
いわゆるブリッジを薄くし、かつ磁石厚みを厚くしたの
で、磁石磁束によるトルクを増大させ、かつ電機子電流
の作る電機子反作用磁束を小さくしているので、回転電
機の発生トルクを減少させることなく、振動・騒音を低
減できる永久磁石式回転電機を提供できる。As described in detail above, the shape of the permanent magnet is
The rotor core is formed in a substantially circular arc shape protruding toward the outer diameter side of the rotor core, and is formed in a substantially circular arc shape protruding toward the inner diameter side of the rotor core, so that the core on the rotor outer diameter side is formed. Department,
The so-called bridge is thinned and the magnet thickness is increased, so that the torque due to the magnet flux is increased, and the armature reaction flux created by the armature current is reduced, so that the torque generated by the rotating electric machine is not reduced. A permanent magnet type rotating electric machine capable of reducing vibration and noise can be provided.
【0021】[0021]
【発明の効果】本発明によれば、電機子電流の増加に従
って振動・騒音が大きくなることがない永久磁石式回転
電機を提供できる。According to the present invention, it is possible to provide a permanent magnet type rotating electric machine in which vibration and noise do not increase as the armature current increases.
【図1】本発明の一実施例に係る永久磁石式回転電機の
径方向断面形状である。FIG. 1 is a radial sectional view of a permanent magnet type rotating electric machine according to an embodiment of the present invention.
【図2】本発明の一実施例に係る永久磁石式回転電機の
軸方向断面形状である。FIG. 2 is an axial cross-sectional shape of a permanent magnet type rotating electric machine according to one embodiment of the present invention.
【図3】本発明の一実施例に係る永久磁石式回転電機の
回転子鉄心形状である。FIG. 3 shows a rotor core shape of a permanent magnet type rotating electric machine according to one embodiment of the present invention.
【図4】本発明の他の実施例に係る永久磁石式回転電機
の径方向断面形状である。FIG. 4 is a radial sectional view of a permanent magnet type rotating electric machine according to another embodiment of the present invention.
【図5】本発明のその他の実施例に係る永久磁石式回転
電機の径方向断面図である。FIG. 5 is a radial sectional view of a permanent magnet type rotating electric machine according to another embodiment of the present invention.
【図6】本発明のさらに他の実施例に係る永久磁石式回
転電機の径方向断面図である。FIG. 6 is a radial cross-sectional view of a permanent magnet type rotating electric machine according to still another embodiment of the present invention.
【図7】本発明のさらに他の実施例に係る集中巻の永久
磁石式回転電機の径方向断面図である。FIG. 7 is a radial cross-sectional view of a concentrated winding permanent magnet type rotating electric machine according to still another embodiment of the present invention.
【図8】本発明のさらに他の実施例に係る集中巻の永久
磁石式回転電機の径方向断面図である。FIG. 8 is a radial cross-sectional view of a concentrated winding permanent magnet type rotating electric machine according to still another embodiment of the present invention.
1…永久磁石式回転電機、2…固定子鉄心、3…ティー
ス、4…スロット、5…電機子巻線、6…固定子、7…
回転子、8…回転子鉄心、9…永久磁石挿入孔、10…
永久磁石、11…シャフト嵌合孔、12…ブリッジ部、
13…磁極間鉄心、14…ボス回転子鉄心、15…ボス
孔、16…永久磁石、17…スリット、18,19…永
久磁石。DESCRIPTION OF SYMBOLS 1 ... Permanent magnet rotary electric machine, 2 ... Stator iron core, 3 ... Teeth, 4 ... Slot, 5 ... Armature winding, 6 ... Stator, 7 ...
Rotor, 8 ... Rotor core, 9 ... Permanent magnet insertion hole, 10 ...
Permanent magnet, 11: shaft fitting hole, 12: bridge part,
13: core between magnetic poles, 14: boss rotor core, 15: boss hole, 16: permanent magnet, 17: slit, 18, 19: permanent magnet.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山本 弘毅 茨城県日立市大みか町七丁目1番1号 株 式会社日立製作所日立研究所内 (72)発明者 高橋 身佳 茨城県日立市大みか町七丁目1番1号 株 式会社日立製作所日立研究所内 (72)発明者 野間 啓二 千葉県習志野市東習志野七丁目1番1号 株式会社日立製作所産業機器グループ内 (72)発明者 佐藤 和雄 千葉県習志野市東習志野七丁目1番1号 株式会社日立製作所産業機器グループ内 (72)発明者 妹尾 正治 千葉県習志野市東習志野七丁目1番1号 株式会社日立製作所産業機器グループ内 Fターム(参考) 5H002 AA04 AB06 AB07 AE07 AE08 5H619 AA01 BB01 BB06 BB13 BB15 PP01 PP02 PP06 PP08 PP14 5H621 AA02 GA01 GA04 GB06 HH01 JK02 5H622 AA02 CA02 CA05 CA13 CB04 CB05 PP03 PP10 PP11 QB05 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroki Yamamoto 7-1-1, Omikacho, Hitachi City, Ibaraki Prefecture Within Hitachi Research Laboratory, Hitachi, Ltd. (72) Inventor Mika Takahashi 7, Omikamachi, Hitachi City, Ibaraki Prefecture No. 1-1 In Hitachi Research Laboratory, Hitachi, Ltd. (72) Inventor Keiji Noma 7-1, 1-1 Higashi Narashino, Narashino City, Chiba Prefecture Within the Industrial Equipment Group, Hitachi, Ltd. 7-1-1, Hitachi, Ltd. Industrial Equipment Group (72) Inventor Shoji Senoo 7-1-1, Higashi-Narashino, Narashino-shi, Chiba F-term in the Industrial Equipment Group, Hitachi, Ltd. 5H002 AA04 AB06 AB07 AB07 AE07 AE08 5H619 AA01 BB01 BB06 BB13 BB15 PP01 PP02 PP06 PP08 PP14 5H621 AA02 GA01 GA04 GB06 HH01 JK02 5H622 AA02 CA02 CA05 CA13 CB04 CB05 PP03 PP10 PP11 QB05
Claims (13)
に電機子巻線が施された固定子と、回転子鉄心に形成さ
れた複数の永久磁石挿入孔中に永久磁石が納められた回
転子とを有する永久磁石式回転電機において、前記永久
磁石の形状を、前記回転子鉄心の外径側に向かって凸形
の略円弧状に形成するとともに、該回転子鉄心の内径側
に向かって凸形の略円弧状に形成したことを特徴とする
永久磁石式回転電機。1. A stator in which an armature winding is provided in a plurality of slots formed in a stator core, and a permanent magnet is contained in a plurality of permanent magnet insertion holes formed in a rotor core. In the permanent magnet type rotating electric machine having the rotor, the shape of the permanent magnet is formed in a substantially arc shape convex toward the outer diameter side of the rotor core, and the shape of the permanent magnet is directed toward the inner diameter side of the rotor core. A permanent magnet type rotating electric machine characterized in that it is formed in a substantially arc shape with a convex shape.
に電機子巻線が施された固定子と、回転子鉄心に形成さ
れた複数の永久磁石挿入孔中に永久磁石が納められた回
転子とを有する永久磁石式回転電機において、前記永久
磁石の形状を、前記回転子鉄心の内外径側に向かって凸
形の略円弧状に形成するとともに、該外径側の略円弧状
の周長より該内径側の略円弧状の周長を長くしたことを
特徴とする永久磁石式回転電機。2. A stator in which an armature winding is provided in a plurality of slots formed in a stator core, and permanent magnets are accommodated in a plurality of permanent magnet insertion holes formed in a rotor core. And a permanent magnet type rotating electric machine having a rotor, wherein the shape of the permanent magnet is formed in a substantially arc shape convex toward the inner and outer diameter sides of the rotor core, and the substantially arc shape is formed on the outer diameter side. A permanent magnet type rotating electric machine characterized in that a substantially arc-shaped circumference on the inner diameter side is longer than a circumference.
に電機子巻線が施された固定子と、回転子鉄心に形成さ
れた複数の永久磁石挿入孔中に永久磁石が納められた回
転子とを有する永久磁石式回転電機において、前記永久
磁石の形状を、前記回転子鉄心の内外径側に向かって凸
形の略円弧状に形成するとともに、該回転子鉄心の片端
部にシャフトと嵌合する内径より大きくしたボス回転子
鉄心を設け、該ボス回転子鉄心の径方向最小厚みを2mm
以下に設定したことを特徴とする永久磁石式回転電機。3. A stator in which an armature winding is provided in a plurality of slots formed in a stator core, and a permanent magnet is accommodated in a plurality of permanent magnet insertion holes formed in a rotor core. In the permanent magnet type rotating electric machine having a rotor, the shape of the permanent magnet is formed in a substantially arc shape convex toward the inner and outer diameter sides of the rotor core, and a shaft is provided at one end of the rotor core. A boss rotor iron core larger than the inner diameter to be fitted is provided, and the minimum radial thickness of the boss rotor iron core is 2 mm.
A permanent magnet rotating electric machine characterized by the following settings.
磁石の極間に位置する極間鉄心の周方向幅を外径側より
内径側を幅広くするようにしたことを特徴とする永久磁
石式回転電機。4. The permanent magnet according to claim 1, wherein a circumferential width of the pole core located between the poles of the permanent magnet is wider on an inner diameter side than on an outer diameter side. Rotary electric machine.
磁石の極間に位置する極間鉄心の外径側にスリットを形
成したことを特徴とする永久磁石式回転電機。5. A permanent magnet type rotating electric machine according to claim 1, wherein a slit is formed on the outer diameter side of the pole core located between the poles of the permanent magnet.
に電機子巻線が施された固定子と、回転子鉄心に形成さ
れた複数の永久磁石挿入孔中に永久磁石が納められた回
転子とを有する永久磁石式回転電機において、前記永久
磁石の形状を、前記回転子鉄心の外径側に向かって凸形
の略円弧状に形成するとともに、該回転子鉄心の内径側
に向かってコ字状形状に形成したことを特徴とする永久
磁石式回転電機。6. A stator in which an armature winding is provided in a plurality of slots formed in a stator core, and a permanent magnet is accommodated in a plurality of permanent magnet insertion holes formed in a rotor core. In the permanent magnet type rotating electric machine having the rotor, the shape of the permanent magnet is formed in a substantially arc shape convex toward the outer diameter side of the rotor core, and the shape of the permanent magnet is directed toward the inner diameter side of the rotor core. A permanent magnet type rotating electric machine formed in a U-shape.
に電機子巻線が施された固定子と、回転子鉄心に形成さ
れた複数の永久磁石挿入孔中に永久磁石が納められた回
転子とを有する永久磁石式回転電機において、前記永久
磁石の形状を、前記回転子鉄心の外径側に向かって凸形
の略円弧状に形成するとともに、該回転子鉄心の内径側
に向かってコ字状形状に形成し、該外径側の略円弧状の
周長より該内径側のコ字状形状の周長を長くしたことを
特徴とする永久磁石式回転電機。7. A stator in which an armature winding is provided in a plurality of slots formed in a stator core, and a permanent magnet is accommodated in a plurality of permanent magnet insertion holes formed in a rotor core. In the permanent magnet type rotating electric machine having the rotor, the shape of the permanent magnet is formed in a substantially arc shape convex toward the outer diameter side of the rotor core, and the shape of the permanent magnet is directed toward the inner diameter side of the rotor core. A permanent-magnet-type rotating electric machine characterized in that it is formed in a U-shape, and the circumference of the U-shape on the inner diameter side is made longer than the circumference of the substantially arc shape on the outer diameter side.
に電機子巻線が施された固定子と、回転子鉄心に形成さ
れた複数の永久磁石挿入孔中に永久磁石が納められた回
転子とを有する永久磁石式回転電機において、前記永久
磁石の形状を、前記回転子鉄心の外径側に向かって凸形
の略円弧状に形成するとともに、該回転子鉄心の内径側
に向かってコ字状形状に形成し、該回転子鉄心の片端部
にシャフトと嵌合する内径より大きくしたボス回転子鉄
心を設け、該ボス回転子鉄心の径方向最小厚みを2mm以
下に設定したことを特徴とする永久磁石式回転電機。8. A stator in which armature windings are provided in a plurality of slots formed in a stator core, and permanent magnets are contained in a plurality of permanent magnet insertion holes formed in a rotor core. In the permanent magnet type rotating electric machine having the rotor, the shape of the permanent magnet is formed in a substantially arc shape convex toward the outer diameter side of the rotor core, and the shape of the permanent magnet is directed toward the inner diameter side of the rotor core. A boss rotor core formed in a U-shape and having an inner diameter larger than an inner diameter to be fitted to a shaft is provided at one end of the rotor core, and the minimum radial thickness of the boss rotor core is set to 2 mm or less. A permanent magnet type rotating electric machine characterized by the following.
て、前記永久磁石の極間に位置する極間鉄心の周方向幅
を外径側より内径側を幅広くするようにしたことを特徴
とする永久磁石式回転電機。9. The method according to claim 6, wherein the circumferential width of the pole core located between the poles of the permanent magnet is wider on the inner diameter side than on the outer diameter side. Permanent magnet type rotating electric machine.
て、前記永久磁石の極間に位置する極間鉄心の外径側に
スリットを形成したことを特徴とする永久磁石式回転電
機。10. A permanent magnet type rotating electric machine according to claim 6, wherein a slit is formed on an outer diameter side of the pole core located between the poles of the permanent magnet.
いて、前記電機子巻線が前記固定子鉄心のティースを囲
むように巻装された集中巻であることを特徴とする永久
磁石式回転電機。11. The permanent magnet type rotating device according to claim 1, wherein said armature winding is a concentrated winding wound around teeth of said stator core. Electric machine.
いて、前記永久磁石の厚みをLm、前記固定子鉄心のテ
ィースの径方向長さをLtとしたとき、Lm/Lt>
1.3 以上にしたことを特徴とする永久磁石式回転電
機。12. A method according to claim 1, wherein when a thickness of said permanent magnet is Lm and a radial length of said teeth of said stator core is Lt, Lm / Lt>
1.3 A permanent magnet type rotating electric machine characterized by the above.
いて、前記永久磁石の外径側の周長をLu,内径側の周
長をLbとしたとき、Lb>Luにしたことを特徴とす
る永久磁石式回転電機。13. The permanent magnet according to claim 1, wherein Lb> Lu where Lu is the outer circumferential length of the permanent magnet and Lb is the inner circumferential length of the permanent magnet. Permanent magnet type rotating electric machine.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP35387599A JP2001178037A (en) | 1999-12-14 | 1999-12-14 | Permanent-magnet dynamo-electric machine |
Applications Claiming Priority (1)
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JP35387599A JP2001178037A (en) | 1999-12-14 | 1999-12-14 | Permanent-magnet dynamo-electric machine |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003124019A (en) * | 2001-10-18 | 2003-04-25 | Yaskawa Electric Corp | Permanent magnet and rotor for motor using the same |
KR100436147B1 (en) * | 2001-12-19 | 2004-06-14 | 삼성전자주식회사 | Interior permanent magnet type motor |
US7705482B2 (en) * | 2006-10-30 | 2010-04-27 | H&S Autoshot Mfg. Co. Ltd. | Tool having integrated electricity generator with external stator |
US8519558B2 (en) | 2006-10-30 | 2013-08-27 | Jon J. Leininger | Tool having integrated electricity generator with external stator and power conditioner |
US9705366B2 (en) | 2014-04-08 | 2017-07-11 | Mitsubishi Electric Corporation | Embedded permanent magnet rotary electric machine |
CN116599255A (en) * | 2023-04-06 | 2023-08-15 | 南京埃斯顿机器人工程有限公司 | Motor rotor structure and high-performance servo motor |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11285184A (en) * | 1998-03-27 | 1999-10-15 | Fujitsu General Ltd | Permanent-magnet motor |
JPH11285188A (en) * | 1998-03-27 | 1999-10-15 | Fujitsu General Ltd | Permanent-magnet motor |
JPH11299150A (en) * | 1998-04-16 | 1999-10-29 | Aichi Emerson Electric Co Ltd | Permanent-magnet motor |
-
1999
- 1999-12-14 JP JP35387599A patent/JP2001178037A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11285184A (en) * | 1998-03-27 | 1999-10-15 | Fujitsu General Ltd | Permanent-magnet motor |
JPH11285188A (en) * | 1998-03-27 | 1999-10-15 | Fujitsu General Ltd | Permanent-magnet motor |
JPH11299150A (en) * | 1998-04-16 | 1999-10-29 | Aichi Emerson Electric Co Ltd | Permanent-magnet motor |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003124019A (en) * | 2001-10-18 | 2003-04-25 | Yaskawa Electric Corp | Permanent magnet and rotor for motor using the same |
KR100436147B1 (en) * | 2001-12-19 | 2004-06-14 | 삼성전자주식회사 | Interior permanent magnet type motor |
US7705482B2 (en) * | 2006-10-30 | 2010-04-27 | H&S Autoshot Mfg. Co. Ltd. | Tool having integrated electricity generator with external stator |
US8519558B2 (en) | 2006-10-30 | 2013-08-27 | Jon J. Leininger | Tool having integrated electricity generator with external stator and power conditioner |
US8872370B2 (en) | 2006-10-30 | 2014-10-28 | H & S Autoshot Manufacturing Company, Ltd. | Tool having integrated electricity generator with external stator and power conditioner |
US9705366B2 (en) | 2014-04-08 | 2017-07-11 | Mitsubishi Electric Corporation | Embedded permanent magnet rotary electric machine |
CN116599255A (en) * | 2023-04-06 | 2023-08-15 | 南京埃斯顿机器人工程有限公司 | Motor rotor structure and high-performance servo motor |
CN116599255B (en) * | 2023-04-06 | 2023-11-07 | 南京埃斯顿机器人工程有限公司 | Motor rotor structure and high-performance servo motor |
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