JP3653838B2

JP3653838B2 - Permanent magnet type synchronous rotating machine rotor

Info

Publication number: JP3653838B2
Application number: JP34959695A
Authority: JP
Inventors: 光浩古賀; 筒井　　幸雄; 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: 2005-06-02
Anticipated expiration: 2015-12-20
Also published as: JPH09182331A

Description

【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。
【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）。
【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。
【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。
【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、前記回転子鉄心の軸方向の全積層全域における各永久磁石挿入穴の周方向位置を同一にし、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。
【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。
【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。
【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。
【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。
【図面の簡単な説明】
【図１】本発明の第１の実施例を示す正断面図。
【図２】本発明の第２の実施例を示す正断面図。
【図３】本発明の第３の実施例を示す正断面図。
【符号の説明】
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[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotor of a permanent magnet type synchronous rotating electric machine.
[0002]
[Prior art]
As a conventional technique, a plurality of rectangular permanent magnet insertion holes are provided on the outer diameter side of the 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 addition, there is a rotor of a permanent magnet type rotating electrical machine in which an inverted triangular leakage magnetic flux prevention hole is provided and a permanent magnet having the same size as the permanent magnet insertion hole is inserted into the permanent magnet insertion hole (Japanese Patent Laid-Open No. 6-323292). ).
[0003]
[Problems to be solved by the invention]
However, in the conventional technology, the q-axis magnetic flux (horizontal magnetic flux) due to the armature reaction tends to be saturated at the outer iron core formed between the upper surface of the permanent magnet insertion hole and the outer diameter of the rotor iron core. There is a problem that the torque cannot be used, and a large torque cannot be obtained at start-up or sudden load fluctuation.
Therefore, the present invention provides a permanent magnet type synchronous rotating electrical machine that can suppress the saturation of the q-axis magnetic flux and can use reluctance torque at the outer core portion formed between the upper surface of the permanent magnet insertion hole and the outer diameter of the rotor core. The object is to provide a rotor.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the magnetic flux created by the permanent magnet is circumferentially and in the same direction with respect to the pole pitch line at the outer core portion formed between the upper surface of the permanent magnet insertion hole and the outer diameter of the rotor core. Try to distribute evenly.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
A plurality of rectangular permanent magnet insertion holes are provided on the outer diameter side of the rotor core symmetrically with respect to the radial pole pitch line provided at a predetermined pole pitch angle, and a leakage magnetic flux prevention hole is provided between these permanent magnet insertion holes. In the rotor of a permanent magnet type rotating electrical machine in which a permanent magnet is inserted into the permanent magnet insertion hole, the circumferential position of each permanent magnet insertion hole in the whole axial lamination region of the rotor core is the same, The distribution of the magnetic flux generated by the permanent magnet is distributed in a circumferentially and the same direction with respect to the pole pitch line at the outer core portion formed between the upper surface of the permanent magnet insertion hole and the outer diameter of the rotor core. It is a rotor of a permanent magnet type synchronous rotating electric machine provided with magnetic flux biasing means.
The magnetic flux biasing means is such that the width of the permanent magnet is made shorter than the width of the permanent magnet insertion hole, and the end surface of the permanent magnet is brought into contact with the circumference of the permanent magnet insertion hole and in the same direction.
At 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 4 is distributed circumferentially and in the same direction with respect to the pole pitch line.
The q-axis magnetic flux due to the armature reaction and the magnetic flux due to the permanent magnet are urged at the abutting end surface and only the magnetic flux due to the armature reaction at the non-abutting end surface. The saturation of the q-axis magnetic flux can be suppressed.
[0006]
【Example】
Embodiments will be described below with reference to the drawings.
FIG. 1 is a front sectional view showing a first embodiment.
The shaft 2 is shrink-fitted into the hole 21 on the inner diameter side of the rotor core 1 in which the disc-shaped electromagnetic steel plates are laminated.
A plurality of rectangular permanent magnet insertion holes 3 having a width Bh and a height H are provided on the outer diameter side of the rotor core 1 symmetrically with respect to the radial pole pitch line PL provided at a predetermined pole pitch angle.
As a result, an 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.
Between the end faces in the circumferential direction of each permanent magnet insertion hole 3, an inverted triangular leakage magnetic flux prevention hole 5 is provided with the connection portion 6 left uncut.
In each permanent magnet insertion hole 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 same direction (for example, in the rotational direction). Then, it is fixed in contact with the end face of the permanent magnet insertion hole 3. As a result, a space 31 is formed between the other end surface of the permanent magnet insertion hole 3 and the other end surface of the permanent magnet 4.
[0007]
FIG. 2 is a front sectional view showing a second embodiment.
In this example, the inverted triangular leakage magnetic flux prevention hole 5 of the first embodiment is made into two slit-like leakage magnetic flux prevention holes 5a and 5b provided in parallel. As a result, a small small salient pole 12 is formed between the two leakage magnetic flux prevention holes 5a and 5b. A d-axis magnetic flux flows through the small salient pole 12 to generate reluctance torque.
[0008]
FIG. 3 is a front sectional view showing a third embodiment.
In this example, the width of the permanent magnet insertion hole 3 is equal to the width of the permanent magnet 4, and two irregularly shaped leakage magnetic flux prevention holes 5 c and 5 d are provided between the permanent magnet insertion holes 3. It is provided to be inclined in the same direction as the circumference with respect to the pitch line PL, and the cross-sectional area of the outer iron core portion 11 is asymmetric with respect to the pole pitch line PL.
In the outer iron core portion 11, the q-axis magnetic flux flows while being biased to one side in the circumferential direction.
Compared with the second embodiment, the contact area between the permanent magnet insertion hole 3 and the permanent magnet 4 is increased, so that the permanent magnet 4 is fixed securely.
[0009]
【The invention's effect】
As described above, the present invention can suppress the saturation of the q-axis magnetic flux in the outer iron core, and thus has an effect that the reluctance torque can be used at the time of start-up or in response to a sudden load fluctuation.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing a first embodiment of the present invention.
FIG. 2 is a front sectional view showing a second embodiment of the present invention.
FIG. 3 is a front sectional view showing a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotor 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 part

Claims

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、
前記回転子鉄心の軸方向の全積層全域における各永久磁石挿入穴の周方向位置を同一にし、
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。A plurality of rectangular permanent magnet insertion holes provided on the outer diameter side of the rotor core symmetrically with respect to a radial pole pitch line provided at a predetermined pole pitch angle, and leakage magnetic flux provided between these permanent magnet insertion holes In a rotor of a permanent magnet type rotating electrical machine having a prevention hole and having a permanent magnet inserted into the permanent magnet insertion hole,
The circumferential position of each permanent magnet insertion hole in the entire laminated area in the axial direction of the rotor core is the same,
The distribution of the magnetic flux created by the permanent magnet is distributed in a circumferentially and the same direction with respect to the pole pitch line at the outer core portion 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 characterized by comprising magnetic flux biasing means.

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。By the magnetic flux biasing means, the width of the permanent magnet is made shorter than the width of the permanent magnet insertion hole, and the end face of the permanent magnet is brought into contact with the circumference and the end face in the same direction of the permanent magnet insertion hole. The rotor of the permanent magnet type synchronous rotating electric machine according to claim 1.

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。The rotor of a permanent magnet type synchronous rotating electric machine according to claim 2, wherein two slits provided in parallel with the leakage magnetic flux prevention hole are formed, and a small salient pole is formed between the slits.

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。The magnetic flux biasing means equalizes the width of the permanent magnet insertion hole and the width of the permanent magnet, has two leakage flux prevention holes of different shapes, and each of the leakage flux prevention holes is circular with respect to the pole pitch line. The rotor of the permanent-magnet-type synchronous rotating electrical machine according to claim 1, wherein the rotor is provided so as to be inclined in the same direction and the cross-sectional area of the outer core portion is asymmetric with respect to the pole pitch line.