JPH09182331A

JPH09182331A - Rotor for permanent magnet type synchronous electric rotating machine

Info

Publication number: JPH09182331A
Application number: JP7349596A
Authority: JP
Inventors: Mitsuhiro Koga; 光浩古賀; Yukio Tsutsui; 筒井　　幸雄; Kensho Iwabuchi; 憲昭岩渕
Original assignee: Yaskawa Electric Corp
Current assignee: Yaskawa Electric Corp
Priority date: 1995-12-20
Filing date: 1995-12-20
Publication date: 1997-07-11
Anticipated expiration: 2015-12-20
Also published as: JP3653838B2

Abstract

PROBLEM TO BE SOLVED: To provide the rotor for permanent magnet type synchronous electric rotating machine in which the reluctance torque can be utilized by suppressing the saturation of q-axis flux (quadrature-axis flux). SOLUTION: The permanent magnet type synchronous electric rotating machine is provided with a plurality of rectangular permanent magnet insertion holes 3 arranged symmetrically to polar pitch lines PL, arranged radially at a predetermined polar pitch angle, on the outside diameter side of a rotor core 1, and flux leakage prevention holes 5 made between the permanent magnet insertion holes 3 wherein permanent magnets 4 are inserted into the permanent magnet insertion holes 3. At an outer core part 11 formed between the upper surface of permanent magnet insertion hole 3 and the outside diameter of rotor core 1, flux of the permanent magnet 4 is distributed while being shifted in same circumferential direction from the polar pitch line PL. In order to distribute the flux of permanent magnet 4 while being shifted, width Bm of permanent magnet 4 is set shorter than the width Bh of permanent magnet insertion hole 3 and the end face of permanent magnet 4 is abutted against the end face of permanent magnet insertion hole 3 in same circumferential direction.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、永久磁石形同期回
転電機の回転子に関する。TECHNICAL FIELD The present invention relates to a rotor of a permanent magnet type synchronous rotating electric machine.

【０００２】[0002]

【従来の技術】従来の技術として、所定の極ピッチ角で
設けた放射状の極ピッチ線に対し対称に、回転子鉄心の
外径側に複数の矩形の永久磁石挿入穴を設け、これらの
永久磁石挿入穴の間に、逆三角形の漏洩磁束防止穴を設
け、前記永久磁石挿入穴に永久磁石挿入穴と同じ大きさ
の永久磁石を挿入した永久磁石形回転電機の回転子があ
る（特開平６−３２３２９２号公報）。2. Description of the Related Art As a conventional technique, a plurality of rectangular permanent magnet insertion holes are provided on the outer diameter side of a rotor iron core symmetrically with respect to a radial pole pitch line provided at a predetermined pole pitch angle. There is a rotor of a permanent magnet type rotating electric machine in which an inverted triangular leakage magnetic flux prevention hole is provided between magnet insertion holes, and a permanent magnet having the same size as the permanent magnet insertion hole is inserted into the permanent magnet insertion hole. 6-323292).

【０００３】[0003]

【発明が解決しようとする課題】ところが、従来の技術
では、永久磁石挿入穴の上面と回転子鉄心の外径間に形
成された外鉄心部で、電機子反作用によるｑ軸磁束（横
軸磁束）が飽和しやすいため、リラクタンス・トルクを
利用できず、起動時や急激な負荷変動に大きなトルクを
得られないという問題がある。そこで、本発明は、永久
磁石挿入穴の上面と回転子鉄心の外径間に形成された外
鉄心部で、ｑ軸磁束の飽和を抑え、リラクタンス・トル
クを利用できる永久磁石形同期回転電機の回転子を提供
することを目的とする。However, in the conventional technique, the q-axis magnetic flux (horizontal axis magnetic flux) due to the armature reaction is formed in the outer core portion formed between the upper surface of the permanent magnet insertion hole and the outer diameter of the rotor core. ) Is easily saturated, the reluctance torque cannot be used, and there is a problem that a large torque cannot be obtained at the time of starting or abrupt load change. Therefore, the present invention relates to a permanent magnet type synchronous rotating electric machine capable of suppressing saturation of q-axis magnetic flux and utilizing reluctance torque in an outer core portion formed between the upper surface of the permanent magnet insertion hole and the outer diameter of the rotor core. The purpose is to provide a rotor.

【０００４】[0004]

【課題を解決するための手段】上記課題を解決するた
め、永久磁石挿入穴の上面と前記回転子鉄心の外径間に
形成された外鉄心部で、永久磁石の作る磁束が、極ピッ
チ線に対し、円周かつ同方向に偏って分布するようにす
る。In order to solve the above-mentioned problems, in the outer core portion formed between the upper surface of the permanent magnet insertion hole and the outer diameter of the rotor core, the magnetic flux generated by the permanent magnet has a pole pitch line. On the other hand, it is distributed so that it is distributed in the circumference and in the same direction.

【０００５】[0005]

【発明の実施の形態】所定の極ピッチ角で設けた放射状
の極ピッチ線に対し対称に、回転子鉄心の外径側に複数
の矩形の永久磁石挿入穴を設け、これらの永久磁石挿入
穴間に、漏洩磁束防止穴を設け、前記永久磁石挿入穴に
永久磁石を挿入した永久磁石形回転電機の回転子におい
て、前記永久磁石挿入穴の上面と前記回転子鉄心の外径
間に形成された外鉄心部で、前記永久磁石が作る磁束の
分布を、極ピッチ線に対し、円周かつ同方向に偏って分
布させる磁束偏寄手段を備えた永久磁石形同期回転電機
の回転子である。磁束偏寄手段は、前記永久磁石の幅を
前記永久磁石挿入穴の幅より短くし、前記永久磁石の端
面を前記永久磁石挿入穴の円周かつ同方向の端面に当接
させたことによる。前記永久磁石挿入穴の上面と前記回
転子鉄心の外径間に形成される外鉄心部で、永久磁石４
の作る磁束は極ピッチ線に対し円周かつ同方向に偏って
分布する。電機子反作用によるｑ軸磁束と永久磁石によ
る磁束は、当接している端面では付勢し合い、当接して
いない端面では電機子反作用による磁束のみとなるの
で、永久磁石挿入穴の外鉄心部のｑ軸磁束の飽和を抑え
ることができる。BEST MODE FOR CARRYING OUT THE INVENTION A plurality of rectangular permanent magnet insertion holes are provided on the outer diameter side of a rotor core symmetrically with respect to a radial pole pitch line provided at a predetermined pole pitch angle. In a rotor of a permanent magnet type rotary electric machine in which a leakage magnetic flux prevention hole is provided between and a permanent magnet is inserted in the permanent magnet insertion hole, the rotor is formed between the upper surface of the permanent magnet insertion hole and the outer diameter of the rotor core. A rotor of a permanent magnet type synchronous rotating electric machine having magnetic flux biasing means for biasing the magnetic flux distribution produced by the permanent magnet in the outer core portion so as to be biased circumferentially and in the same direction with respect to the pole pitch line. . The magnetic flux biasing means is configured such that the width of the permanent magnet is shorter than the width of the permanent magnet insertion hole, and the end face of the permanent magnet is brought into contact with the circumferential end face of the permanent magnet insertion hole in the same direction. The outer core portion formed between the upper surface of the permanent magnet insertion hole and the outer diameter of the rotor iron core includes the permanent magnet 4
The magnetic flux created by is distributed around the pole pitch line in the circumference and in the same direction. The q-axis magnetic flux due to the armature reaction and the magnetic flux due to the permanent magnet urge each other at the abutting end faces and become the only magnetic flux due to the armature reaction at the abutting end faces, so that the outer core portion of the permanent magnet insertion hole The saturation of the q-axis magnetic flux can be suppressed.

【０００６】[0006]

【実施例】以下に、図面に基づき実施例を説明する。図
１は、第１の実施例を示す正断面図である。円板状の電
磁鋼板を積層した回転子鉄心１の内径側には、穴２１に
シャフト２を焼き嵌めしてある。所定の極ピッチ角で設
けた放射状の極ピッチ線ＰＬに対し対称に、回転子鉄心
１の外径側に幅Ｂｈで高さＨの矩形の永久磁石挿入穴３
を複数個設けてある。その結果、回転子鉄心１の外径側
と永久磁石挿入穴３の上面の間には、外鉄心部１１が形
成される。おのおのの永久磁石挿入穴３の円周方向の端
面間には、逆三角形の漏洩磁束防止穴５をつなぎ部６を
切り残して設けてある。おのおのの永久磁石挿入穴３内
には、永久磁石挿入穴３の幅Ｂｈより短い幅Ｂｍで高さ
Ｈの永久磁石４を、その端面を円周かつ同方向（例え
ば、回転方向）に偏らせて、永久磁石挿入穴３の端面に
当接させて固定してある。その結果、永久磁石挿入穴３
の他方の端面と永久磁石４の他方の端面の間には、空間
３１が生じる。Embodiments Embodiments will be described below with reference to the drawings. FIG. 1 is a front sectional view showing a first embodiment. A shaft 2 is shrink-fitted in a hole 21 on the inner diameter side of a rotor core 1 formed by laminating disc-shaped electromagnetic steel plates. A rectangular permanent magnet insertion hole 3 having a width Bh and a height H on the outer diameter side of the rotor core 1 symmetrically with respect to a radial pole pitch line PL provided at a predetermined pole pitch angle.
A plurality of are provided. As a result, the outer core portion 11 is formed between the outer diameter side of the rotor core 1 and the upper surface of the permanent magnet insertion hole 3. An inverted triangular leakage flux prevention hole 5 is provided between the end faces in the circumferential direction of each permanent magnet insertion hole 3 with a connecting portion 6 left uncut. In each of the permanent magnet insertion holes 3, a permanent magnet 4 having a width Bm shorter than the width Bh of the permanent magnet insertion hole 3 and a height H is biased in the circumferential direction and in the same direction (for example, the rotation direction). The end face of the permanent magnet insertion hole 3 is abutted and fixed. As a result, the permanent magnet insertion hole 3
A space 31 is formed between the other end surface of the permanent magnet 4 and the other end surface of the permanent magnet 4.

【０００７】図２は第２の実施例を示す正断面図であ
る。この例は、第１の実施例の逆三角形の漏洩磁束防止
穴５を、平行させて設けた２本のスリット状の漏洩磁束
防止穴５ａ、５ｂにしたものである。その結果、２本の
漏洩磁束防止穴５ａ、５ｂ間には、細い小突極１２が形
成される。この小突極１２にはｄ軸磁束が流れ、リラク
タンス・トルクを生じる。FIG. 2 is a front sectional view showing a second embodiment. In this example, the inverted triangular leakage flux prevention holes 5 of the first embodiment are replaced by two slit-shaped leakage flux prevention holes 5a and 5b provided in parallel. As a result, a thin small salient pole 12 is formed between the two leakage flux prevention holes 5a and 5b. A d-axis magnetic flux flows through the small salient poles 12 to generate reluctance torque.

【０００８】図３は第３の実施例を示す正断面図であ
る。この例は、永久磁石挿入穴３の幅と永久磁石４の幅
を等しくし、永久磁石挿入穴３間に、２個の異形状の漏
洩磁束防止穴５ｃ、５ｄを永久磁石挿入穴３の極ピッチ
線ＰＬに対し円周かつ同方向に傾斜させて設け、外鉄心
部１１の断面積を極ピッチ線ＰＬに対し非対称にしたも
のである。外鉄心部１１内で、ｑ軸磁束が円周方向の一
方に偏って流れる。第２の実施例に比べ、永久磁石挿入
穴３と永久磁石４の接触面積が増えるので、永久磁石４
の固定が確実になる。FIG. 3 is a front sectional view showing a third embodiment. In this example, the width of the permanent magnet insertion hole 3 and the width of the permanent magnet 4 are made equal, and two differently-shaped leakage flux prevention holes 5c and 5d are provided between the permanent magnet insertion holes 3 as poles of the permanent magnet insertion hole 3. The outer core portion 11 is asymmetrical with respect to the pole pitch line PL by being provided circumferentially and inclined in the same direction with respect to the pitch line PL. In the outer core portion 11, the q-axis magnetic flux flows in one direction in the circumferential direction. As compared with the second embodiment, the contact area between the permanent magnet insertion hole 3 and the permanent magnet 4 increases, so that the permanent magnet 4
Will be fixed securely.

【０００９】[0009]

【発明の効果】本発明は、以上述べたように、外鉄心部
のｑ軸磁束の飽和を抑えることができるので、起動時や
急激な負荷変動に対応して、リラクタンス・トルクを利
用できるという効果がある。As described above, according to the present invention, the saturation of the q-axis magnetic flux in the outer core portion can be suppressed, so that the reluctance torque can be used at the time of start-up or in response to a sudden load change. effective.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の第１の実施例を示す正断面図。FIG. 1 is a front sectional view showing a first embodiment of the present invention.

【図２】本発明の第２の実施例を示す正断面図。FIG. 2 is a front sectional view showing a second embodiment of the present invention.

【図３】本発明の第３の実施例を示す正断面図。FIG. 3 is a front sectional view showing a third embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１回転子鉄心１１外鉄心部１２小突極２シャフト２１穴３永久磁石挿入穴４永久磁石３１空間５、５ａ、５ｂ、５ｃ、５ｄ漏洩磁束防止穴６つなぎ部 1 Rotor Iron Core 11 Outer Iron Core Part 12 Small Salient Pole 2 Shaft 21 Hole 3 Permanent Magnet Insertion Hole 4 Permanent Magnet 31 Space 5, 5a, 5b, 5c, 5d Leakage Magnetic Flux Prevention Hole 6 Connecting Portion

Claims

【特許請求の範囲】[Claims]

【請求項１】所定の極ピッチ角で設けた放射状の極ピッ
チ線に対し対称に、回転子鉄心の外径側に設けた複数の
矩形の永久磁石挿入穴と、これらの永久磁石挿入穴間に
設けた漏洩磁束防止穴を備え、前記永久磁石挿入穴に永
久磁石を挿入した永久磁石形回転電機の回転子におい
て、前記永久磁石挿入穴の上面と前記回転子鉄心の外径間に
形成された外鉄心部で、前記永久磁石が作る磁束の分布
を、極ピッチ線に対し、円周かつ同方向に偏って分布さ
せる磁束偏寄手段を備えたことを特徴とする永久磁石形
同期回転電機の回転子。1. A plurality of rectangular permanent magnet insertion holes provided on the outer diameter side of a rotor core symmetrically with respect to a radial pole pitch line provided at a predetermined pole pitch angle, and between these permanent magnet insertion holes. In a rotor of a permanent magnet type rotating electrical machine having a leakage magnetic flux prevention hole provided in a permanent magnet insertion hole, the rotor is formed between an upper surface of the permanent magnet insertion hole and an outer diameter of the rotor core. The permanent magnet type synchronous rotating electric machine, further comprising magnetic flux biasing means for biasing the distribution of the magnetic flux generated by the permanent magnets in the outer iron core portion in a circumferentially and in the same direction with respect to the pole pitch line. Rotor.

【請求項２】前記磁束偏寄手段が、前記永久磁石の幅を
前記永久磁石挿入穴の幅より短くし、前記永久磁石の端
面を前記永久磁石挿入穴の円周かつ同方向の端面に当接
させたことによる請求項１に記載の永久磁石形同期回転
電機の回転子。2. The magnetic flux biasing means makes the width of the permanent magnet shorter than the width of the permanent magnet insertion hole, and makes the end surface of the permanent magnet contact the circumference and the end surface of the permanent magnet insertion hole in the same direction. The rotor of the permanent magnet type synchronous rotating electric machine according to claim 1, which is brought into contact with the rotor.

【請求項３】前記漏洩磁束防止穴を平行させて設けた２
本のスリットとし、このスリット間に小突極を形成した
請求項２に記載の永久磁石形同期回転電機の回転子。3. The magnetic flux leakage prevention holes are provided in parallel with each other.
The rotor of a permanent magnet type synchronous rotating electric machine according to claim 2, wherein the slits are book-like and small salient poles are formed between the slits.

【請求項４】前記磁束偏寄手段が、前記永久磁石挿入穴
の幅と前記永久磁石の幅を等しくし、前記漏洩磁束防止
穴を異形状の２個とし、前記漏洩磁束防止穴おのおのを
極ピッチ線に対し円周かつ同方向に傾斜させて設け、前
記外鉄心部の断面積を極ピッチ線に対して非対称にする
ことによる請求項１に記載の永久磁石形同期回転電機の
回転子。4. The magnetic flux biasing means equalizes the width of the permanent magnet insertion hole and the width of the permanent magnet, and the leakage magnetic flux prevention holes have two different shapes, and each leakage magnetic flux prevention hole is a pole. The rotor for a permanent magnet type synchronous rotating electric machine according to claim 1, wherein the rotor is provided circumferentially and inclined in the same direction with respect to the pitch line, and the cross-sectional area of the outer core portion is asymmetric with respect to the pole pitch line.