JP4863145B2 - Permanent magnet type rotating electric machine - Google Patents

Permanent magnet type rotating electric machine Download PDF

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JP4863145B2
JP4863145B2 JP2008148178A JP2008148178A JP4863145B2 JP 4863145 B2 JP4863145 B2 JP 4863145B2 JP 2008148178 A JP2008148178 A JP 2008148178A JP 2008148178 A JP2008148178 A JP 2008148178A JP 4863145 B2 JP4863145 B2 JP 4863145B2
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rotor shaft
permanent magnet
retaining ring
rotor
magnet type
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JP2009296800A (en
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敏和 紙上
知幸 岩崎
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西芝電機株式会社
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Description

本発明は永久磁石形回転電機に関し、特に回転子に発生する熱応力を軽減することのできる永久磁石形回転電機に関する。   The present invention relates to a permanent magnet type rotating electrical machine, and more particularly to a permanent magnet type rotating electrical machine capable of reducing thermal stress generated in a rotor.

永久磁石を回転界磁極に用いた回転電機、すなわち永久磁石形発電機あるいは永久磁石形電動機は、回転子軸の外周に円周方向にＮ極、Ｓ極が交互に着磁された断面弧状の永久磁石を配置固定し、さらにこの永久磁石の外周部全体を円筒状の保持環で覆って高速回転中の遠心力で永久磁石の飛散を防止する構造を採用している（例えば、特許文献１、２参照）。   A rotating electrical machine using a permanent magnet as a rotating field magnetic pole, that is, a permanent magnet generator or a permanent magnet motor, has a cross-sectional arc shape in which N poles and S poles are alternately magnetized in the circumferential direction on the outer periphery of a rotor shaft. A structure is adopted in which permanent magnets are arranged and fixed, and the entire outer periphery of the permanent magnets is covered with a cylindrical retaining ring to prevent the permanent magnets from being scattered by centrifugal force during high-speed rotation (for example, Patent Document 1). 2).

図３は特許文献１あるいは２に記載の永久磁石形回転電機の回転子の半裁縦断面図である。
図３において、１は永久磁石形回転電機であり、２は電磁鋼板を軸方向に積層して環状に形成された電機子鉄心２−１およびその電機子鉄心のスロット内に収納した電機子巻線２−２を有する固定子、３は電機子鉄心２−１で形成された環状空間部に所定の空隙を介して回転可能に配置され、しかも界磁極に永久磁石を用いた回転子である。 FIG. 3 is a half-cut longitudinal sectional view of a rotor of a permanent magnet type rotating electric machine described in Patent Document 1 or 2.
3, 1 is a permanent magnet type rotary electric machine, 2 is an armature winding which is housed in the slots of the armature core 2 -1 and its armature core which is formed annularly by laminating electromagnetic steel plates in the axial direction stator having a linear 2-2, 3 is rotatably arranged via a predetermined gap to an annular space formed by the armature core 2 -1, is a rotor with permanent magnets Moreover the field pole .

この回転子３は、回転子軸４の外周全体を覆うように形成された長い円筒状の保持環５の内周部に対して、円周方向にＮ極、Ｓ極が交互に配置されるように構成された永久磁石６を接着剤等で固定し、かつ、保持環５の両端部に形成したエンドリング部５Ｒ−１および５Ｒ−２によって、回転子軸４の外周面に溶接または焼き嵌め等で接合固定されるように構成されている。７−１、７−２は保持環５のエンドリング部５Ｒ−１および５Ｒ−２と、回転子軸４の外周面との接合部を表す。
特開２０００−２７８８９８号公報 特開２００４−２６６９１９号公報 The rotor 3 has N and S poles arranged alternately in the circumferential direction with respect to the inner periphery of a long cylindrical holding ring 5 formed so as to cover the entire outer periphery of the rotor shaft 4. The permanent magnet 6 configured as described above is fixed with an adhesive or the like, and is welded or baked to the outer peripheral surface of the rotor shaft 4 by the end ring portions 5R- 1 and 5R- 2 formed at both ends of the retaining ring 5. It is configured to be joined and fixed by fitting or the like. 7 −1 and 7 −2 represent joint portions between the end ring portions 5R- 1 and 5R - 2 of the retaining ring 5 and the outer peripheral surface of the rotor shaft 4.
JP 2000-278898 A JP 2004-266919 A

通常、回転子３に設けた永久磁石６から出た磁束Φは、保持環５を透過して固定子２に到達する。保持環５は永久磁石６の磁束Φを有効利用するために磁性材料で構成されることが多い。回転子３が回転すると、保持環５の表面に渦電流が発生し、保持環５は渦電流によるジュール熱で加熱されて軸方向に伸びようとするが、その両端のエンドリング部５Ｒ−１および５Ｒ−２が接合部７−１、７−２で拘束されているため、自由に伸びることができない。このため、保持環５には熱応力が発生する。 Usually, the magnetic flux Φ emitted from the permanent magnet 6 provided in the rotor 3 passes through the holding ring 5 and reaches the stator 2. The retaining ring 5 is often made of a magnetic material in order to effectively use the magnetic flux Φ of the permanent magnet 6. When the rotor 3 rotates, an eddy current is generated on the surface of the holding ring 5, and the holding ring 5 is heated by Joule heat due to the eddy current and tends to extend in the axial direction, but end ring portions 5 </ b> R −1 at both ends thereof. And 5R- 2 is restrained by the joint portions 7-1 , 7-2 , and thus cannot be freely extended. For this reason, thermal stress is generated in the retaining ring 5.

接合部７−１、７−２に溶接接合を採用した場合は、保持環５の熱伸びによって発生した熱応力で溶接接合部が亀裂等の損傷を受けるおそれがある。また、接合部７−１、７−２に焼き嵌めを採用した場合には、保持環５の熱伸びにより保持環５と回転子軸４との接合位置が製作当初の状態からずれてくる。このため、回転電機の起動・停止が繰り返し行われると、保持環６は熱伸び・収縮を繰り返すため、接合部７−１、７−２の位置ずれが次第に大きくなり、極端な場合は保持環５が回転子軸４から外れ、回転電機が破損するおそれがある。 When welded joints are employed for the joints 7 -1 and 7-2 , the welded joints may be damaged such as cracks due to thermal stress generated by the thermal elongation of the retaining ring 5. The joining portion 7 -1, in the case of employing a shrink-fit to 7-2, bonding position between the retaining ring 5 and the rotor shaft 4 by thermal expansion of the retaining ring 5 comes deviates from fabrication initial state. For this reason, when the rotating electrical machine is repeatedly started and stopped, the retaining ring 6 repeats thermal expansion and contraction, so that the displacement of the joints 7 -1 and 7 -2 gradually increases. 5 may come off from the rotor shaft 4 and the rotating electrical machine may be damaged.

このように従来の永久磁石形回転電機における保持環５の接合固定方法では、保持環の熱伸びによって接合部７−１、７−２に亀裂や位置ずれ等が発生し、極端な場合は回転電機の破損に至るおそれがある。 Thus, in the bonding method of fixing the retaining ring 5 in the conventional permanent magnet type rotary electric machine, the joint 7 -1 by thermal expansion of the retaining ring, cracks or displacement or the like occurs in 7 -2 extreme cases rotation There is a risk of damage to the electric machine.

そこで本発明の目的は、上記の課題に鑑みてなされたもので、永久磁石を固定する保持環が熱伸びをしても、回転子軸と保持環との接合固定部に亀裂あるいは位置ずれ等の現象が発生しないようにした回転子を有する永久磁石形回転電機を提供することにある。   Therefore, the object of the present invention has been made in view of the above problems, and even if the retaining ring for fixing the permanent magnet is thermally stretched, the joint fixing portion between the rotor shaft and the retaining ring is cracked or misaligned. It is an object of the present invention to provide a permanent magnet type rotating electric machine having a rotor that prevents the above phenomenon from occurring.

前記目的を解決するために、請求項１に係る発明は、環状に形成された電機子鉄心に電機子巻線を巻回して構成した固定子と、前記電機子鉄心によって形成された空間部に回転自在に配置された回転子とを備え、前記回転子を、回転子軸と、当該回転子軸の周囲を覆いかつ回転子軸に接合固定された保持環と、前記保持環の内周面に固定された永久磁石とから構成した永久磁石形回転電機において、前記回転子軸は、前記永久磁石に対向する部分の外径よりもその両側の部分の外径を小さくすることによって回転子軸の軸受側端部に段差部を形成し、前記保持環および前記永久磁石は、それぞれ軸方向のほぼ中央部分で２分割されるとともに、各分割面間に所定寸法の隙間を設け、更に２分割されたそれぞれの前記保持環は、前記分割面と反対側の端部を前記回転子軸の両側に形成されたそれぞれの前記段差部に当接させて位置決めした状態で当該回転子軸に接合固定されることを特徴とする。 In order to solve the above-mentioned object, an invention according to claim 1 includes a stator formed by winding an armature winding around an annular armature core, and a space formed by the armature core. A rotor that is rotatably arranged, and the rotor includes a rotor shaft, a retaining ring that covers the periphery of the rotor shaft and is fixed to the rotor shaft, and an inner peripheral surface of the retaining ring. In the permanent magnet type rotating electrical machine constituted by the permanent magnet fixed to the rotor shaft, the rotor shaft is formed by making the outer diameter of the portions on both sides smaller than the outer diameter of the portion facing the permanent magnet. A stepped portion is formed at the bearing side end of the bearing ring, and the retaining ring and the permanent magnet are each divided into two at the substantially central portion in the axial direction, and a gap of a predetermined dimension is provided between the divided surfaces, and further divided into two. each of the retaining ring which is the reaction to the dividing plane Characterized in that in a state where the end portion of the side is positioned it is brought into contact with the each of the stepped portions formed on both sides of the rotor shaft is joined and fixed to the rotor shaft.

また、請求項２に係る発明は、請求項１記載の永久磁石形回転電機において、前記隙間に、分割された各保持環の熱伸びに支障をきたさない弾性材を詰めたことを特徴とする。 The invention according to claim 2 is the permanent magnet type rotating electrical machine according to claim 1, characterized in that the gap is filled with an elastic material that does not hinder the thermal expansion of each of the divided retaining rings. .

本発明によれば、保持環と回転子軸とが溶接接合の場合、保持環の熱伸びによって発生した熱応力による溶接接合部の亀裂等の損傷を抑え、保持環と回転子軸とが焼き嵌めの場合、保持環の熱伸びの繰り返しによる保持環と回転子軸の位置ずれによる回転電機の損傷を抑えることができる。   According to the present invention, when the retaining ring and the rotor shaft are welded, damage such as cracks in the welded joint due to the thermal stress generated by the thermal elongation of the retaining ring is suppressed, and the retaining ring and the rotor shaft are baked. In the case of the fitting, it is possible to suppress damage to the rotating electrical machine due to the positional deviation between the holding ring and the rotor shaft due to repeated thermal elongation of the holding ring.

以下、図面を参照して本発明の実施形態について説明する。なお、各図を通して同一部分には同一符号を付けて、重複する説明は適宜省略する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the same portions are denoted by the same reference numerals throughout the drawings, and redundant descriptions are omitted as appropriate.

（第１の実施形態）
図１を参照して第１の実施の形態について説明する。
図１は本実施形態による永久磁石形回転電機の回転子を主体にした半裁縦断面図である。 (First embodiment)
A first embodiment will be described with reference to FIG.
FIG. 1 is a half-cut longitudinal sectional view mainly composed of a rotor of a permanent magnet type rotating electric machine according to the present embodiment.

本実施形態が図３で示した従来例との異なる点は、円筒状の保持環５および永久磁石６を軸方向のほぼ中央部分で２分割して、分割保持環５−１、５−２、および分割永久磁石６−１、６−２とし、分割面間に所定の寸法の隙間８を設けるように構成した点である。ここで、隙間８の所定寸法とは、各分割保持環５−１、５−２が、渦電流によるジュール熱で加熱されて軸方向に伸びる場合の最大伸び幅の和よりも少し大きめの寸法に設定しておくものとする。 The present embodiment is different from the conventional example shown in FIG. 3 in that the cylindrical holding ring 5 and the permanent magnet 6 are divided into two at the substantially central portion in the axial direction, and the divided holding rings 5 −1 , 5 −2. , And split permanent magnets 6 -1 and 6 -2, and a gap 8 having a predetermined size is provided between the split surfaces. Here, the predetermined dimension of the gap 8 is a dimension slightly larger than the sum of the maximum extension widths when the divided holding rings 5 -1 and 5 -2 are heated by Joule heat caused by eddy currents and extend in the axial direction. Shall be set to

分割永久磁石６−１および６−２は、それぞれ分割保持環５−１および５−２の内周面に接着剤等で固定され、一方、分割保持環５−１および５−２は両端部すなわち、図示していない軸受側端部をエンドリング部５Ｒ−１および５Ｒ−２によって回転子軸４に溶接または焼き嵌め等によって接合固定されるようになっている。 The split permanent magnets 6-1 and 6-2 are fixed to the inner peripheral surfaces of the split holding rings 5-1 and 5-2 with an adhesive or the like, respectively, while the split holding rings 5-1 and 5-2 are at both ends. That is, a bearing side end (not shown) is joined and fixed to the rotor shaft 4 by the end ring portions 5R- 1 and 5R- 2 by welding or shrink fitting.

本実施形態による永久磁石形回転電機は以上のように回転子３を構成したので、回転子３の回転により分割保持環５−１および５−２の表面にそれぞれ渦電流が発生し、分割保持環５−１および５−２はそのジュール熱で加熱されて、軸方向に伸びる。 Since the permanent magnet type rotating electric machine according to the present embodiment has the rotor 3 as described above, eddy currents are generated on the surfaces of the split holding rings 5-1 and 5-2 due to the rotation of the rotor 3, respectively. Rings 5-1 and 5-2 are heated by the Joule heat and extend in the axial direction.

この場合、分割保持環５−１および５−２は、一端がエンドリング５Ｒ−１、５Ｒ−２により回転子軸４に接合されて拘束されているが、他端である分割面側は拘束されておらず、しかも所定寸法の隙間８を隔てて対向している。このため、分割保持環５−１および５−２は分割面で衝突（干渉）することなく、接合部７−１、７−２を起点として隙間８に向って自由に伸びることができる。 In this case, the split retaining rings 5-1 and 5-2 are constrained by joining one end to the rotor shaft 4 by the end rings 5 </ b > R- 1 and 5 </ b > R- 2. In addition, they are opposed to each other with a gap 8 having a predetermined dimension. Therefore, it divided retaining ring 5 -1 and 5 -2 without colliding with dividing plane (interference), can extend freely toward the gap 8 junction 7 -1, 7 -2 as a starting point.

このため、接合部７−１および７−２に溶接接合を採用した場合は、分割保持環５−１および５−２には熱応力は発生せず、接合部７−１および７−２に亀裂等が発生することはなく、回転子３の機械的損傷を抑えることができる。 Therefore, when adopting the welded joint to the joint 7 -1 and 7 -2, thermal stress in the divided retaining ring 5 -1 and 5 -2 not occur, the junction 7 -1 and 7 -2 Cracks or the like do not occur, and mechanical damage to the rotor 3 can be suppressed.

また、接合部７−１および７−２に焼き嵌め接合を採用した場合も同様に、回転子軸４からエンドリング５Ｒ−１、５Ｒ−２の接合位置が当初の状態から位置ずれを起こさないので、分割保持環５−１および５−２が熱伸び・収縮を繰り返しても分割保持環５−１および５−２が回転子軸４から外れるようなことはなく、回転子３の機械的損傷を抑えることができる。 Similarly, when employing the shrink-fitting joined to the joint portion 7 -1 and 7 -2, end rings 5R -1 from the rotor shaft 4, the position of junction 5R -2 does not cause a positional deviation from the original state since, split retaining ring 5 -1 and 5 -2 be divided holding repeated thermal elongation and contraction ring 5 -1 and 5 -2 never like out of the rotor shaft 4, the mechanical rotor 3 Damage can be suppressed.

（第２の実施形態）
図２を参照して第２の実施の形態について説明する。
図２は本実施形態による永久磁石形回転電機の回転子を主体にした半裁縦断面図である。 (Second Embodiment)
A second embodiment will be described with reference to FIG.
FIG. 2 is a half-cut longitudinal sectional view mainly including a rotor of the permanent magnet type rotating electric machine according to the present embodiment.

本実施形態が第１の実施形態と異なる点は、分割保持環５−１および５−２と回転子軸４との接合部７−１、７−２に段差部４−１、４−２を設けるようにした点である。その他の点については第１の実施形態と同じなので説明は省略する。 This embodiment is different from the first embodiment in that the stepped portions 4 -1 and 4 -2 are connected to the joint portions 7 -1 and 7 -2 between the divided holding rings 5-1 and 5-2 and the rotor shaft 4. This is the point that is provided. Since the other points are the same as those of the first embodiment, description thereof is omitted.

接合部７−１、７−２に段差部４−１、４−２を形成するには、回転子軸４の分割永久磁石６−１、６−２に対向する部分の外径Ｄ１よりもエンドリング５Ｒ−１および５Ｒ−２と接合する部分の外径Ｄ２を小さくすることによって、回転子軸４自体に寸法差（Ｄ１−Ｄ２）による段差部４−１、４−２を形成し、さらにエンドリング５Ｒ−１、５Ｒ−２の内径を小径部の外径Ｄ２に適合する寸法にすればよい。 Junction 7 -1, 7 -2 stepped portion 4 -1, to form a 4 -2, divided permanent magnets 6 -1 rotor shaft 4, than the outer diameter D 1 of the portion opposed to the 6-2 by also reduce the outer diameter D 2 of the portion to be joined with end rings 5R -1 and 5R -2, stepped portions due to dimensional differences on the rotor shaft 4 itself (D 1 -D 2) 4 -1 , 4 -2 forming a further end ring 5R -1, may be the inner diameter of the 5R -2 to sized to fit the outer diameter D 2 of the small diameter portion.

以上のように本実施形態による永久磁石形回転電機は回転子３の回転子軸４の両端部に段差部４−１、４−２を形成し、この段差部４−１、４−２に分割保持環５−１および５−２のエンドリング部５Ｒ−１および５Ｒ−２を焼き嵌めによって接合する場合、段差部４−１および４−２があることで、回転子軸４の両側から分割保持環５−１および５−２を挿入する際、エンドリング部５Ｒ−１および５Ｒ−２が段差部４−１および４−２に当接した位置で位置決めされるので、適正な隙間８を確保することが可能である。 Above the permanent magnet type rotary electric machine according to the present embodiment is stepped portion 4-1 at both ends of the rotor shaft 4 of the rotor 3, 4 -2 is formed, the stepped portion 4 -1, the 4 -2 when joining by shrink-fitting the end ring portion 5R-1 and 5R -2 split retaining ring 5 -1 and 5 -2 that there is a stepped portion 4 -1 and 4 -2, from both sides of the rotor shaft 4 when inserting the split retention ring 5 -1 and 5 -2, since the end ring portion 5R-1 and 5R -2 is positioned in contact with the position on the stepped portion 4 -1 and 4 -2, proper clearance 8 Can be secured.

これに対して回転子軸４に段差部４−１および４−２を形成していなければ、分割保持環５−１および５−２を挿入する際に、接合部７−１および７−２において分割保持環５−１および５−２と回転子軸４がずれる可能性があり、隙間８が適正値より小さくなる可能性がある。万一隙間８が適正値より小さいと、分割保持環５−１および５−２の熱伸びを吸収することができず、分割保持環７−１と７−２が衝突（干渉）して接合部７−１および７−２において位置ずれが発生する可能性がある。 If not forming a stepped portion 4 -1 and 4 -2 rotor shaft 4 with respect thereto, when inserting the split retention ring 5 -1 and 5 -2 joints 7-1 and 7 -2 In this case, the split retaining rings 5-1 and 5-2 and the rotor shaft 4 may be misaligned, and the gap 8 may be smaller than an appropriate value. When Should the gap 8 is less than the appropriate value, it can not absorb the thermal expansion of the split retaining ring 5 -1 and 5 -2, split retaining ring 7 -1 and 7 -2 collision (interference) to the junction Position misalignment may occur in the sections 7-1 and 7-2 .

したがって、本実施形態では、第１の実施形態に比べ、分割保持環５−１および５−２の相互間に適正な隙間８を設けることができる。
なお、分割保持環５−１および５−２の熱伸びに支障をきたさないようにして隙間８に弾性材を詰めることにより隙間８に鉄粉や油の飛沫、その他のごみが進入しないようにしてもよい。 Therefore, in the present embodiment, an appropriate gap 8 can be provided between the divided holding rings 5-1 and 5-2 as compared with the first embodiment.
Incidentally, splash of iron powder and oil in the gap 8, the other dust to avoid penetration by filling an elastic member in the gap 8 so as not disturb the thermal expansion of the split retaining ring 5 -1 and 5 -2 May be.

以上述べたように、本実施形態によれば、分割保持環５−１および５−２が軸方向に熱伸びを起こしても隙間８を設けているので拘束されることなく自由に伸びることができ、しかも、分割保持環５−１および５−２のエンドリング５Ｒ−１および５Ｒ−２の位置が回転子軸４に形成した段差部４−１、４−２で位置決めされるので、分割保持環７−１と７−２の自由端が衝突（干渉）することはない。この結果、接合部７−１および７−２における位置ずれは発生せず、回転子３の機械的損傷を抑えることができる。 As described above, according to the present embodiment, even if the split retaining rings 5-1 and 5-2 cause thermal expansion in the axial direction, the gap 8 is provided, so that it can be freely extended without being constrained. It can, moreover, divided retaining ring 5 -1 and 5 -2 end rings 5R-1 and 5R stepped portion 4 position is formed on the rotor shaft 4 -2 -1, since it is positioned at 4 -2, divided The free ends of the holding rings 7-1 and 7-2 do not collide (interfere). As a result, positional deviation at the joint 7 -1 and 7-2 does not occur, it is possible to suppress the mechanical damage of the rotor 3.

本発明の第１の実施形態による永久磁石形回転電機の回転子半裁縦断面図。1 is a longitudinal sectional view of a rotor half of a permanent magnet type rotating electric machine according to a first embodiment of the present invention. 本発明の第２の実施形態による永久磁石形回転電機の回転子半裁縦断面図。The rotor half-cut longitudinal cross-sectional view of the permanent-magnet-type rotary electric machine by the 2nd Embodiment of this invention. 従来の永久磁石形回転電機の回転子半裁縦断面図。The rotor half-cut longitudinal cross-sectional view of the conventional permanent magnet type rotary electric machine.

符号の説明Explanation of symbols

１…永久磁石形回転電機、２…固定子、３…回転子、４…回転子軸、４−１、４−２…回転子軸の段差部、５…保持環、５−１、５−２…分割保持環、５Ｒ−１、５Ｒ−２…エンドリング、６…永久磁石、６−１、６−２…分割永久磁石、７−１、７−２…接合部、８…隙間、Φ…磁束。 1 ... permanent magnet type rotary electric machine, 2 ... stator, 3 ... rotor, 4 ... rotor shaft, 4-1, the stepped portion of the 4 -2 ... rotor shaft, 5 ... holding ring, 5-1, 5 - 2 ... Split retaining ring, 5R- 1 , 5R- 2 ... End ring, 6 ... Permanent magnet, 6-1 , 6-2 ... Split permanent magnet, 7-1 , 7-2 ... Joint, 8 ... Gap, [Phi] ... magnetic flux.

Claims (2)

環状に形成された電機子鉄心に電機子巻線を巻回して構成した固定子と、前記電機子鉄心によって形成された空間部に回転自在に配置された回転子とを備え、前記回転子を、回転子軸と、当該回転子軸の周囲を覆いかつ回転子軸に接合固定された保持環と、前記保持環の内周面に固定された永久磁石とから構成した永久磁石形回転電機において、
前記回転子軸は、前記永久磁石に対向する部分の外径よりもその両側の部分の外径を小さくすることによって回転子軸の軸受側端部に段差部を形成し、前記保持環および前記永久磁石は、それぞれ軸方向のほぼ中央部分で２分割されるとともに、各分割面間に所定寸法の隙間を設け、更に２分割されたそれぞれの前記保持環は、前記分割面と反対側の端部を前記回転子軸の両側に形成されたそれぞれの前記段差部に当接させて位置決めした状態で当該回転子軸に接合固定されることを特徴とする永久磁石形回転電機。 A stator configured by winding an armature winding around an annular armature core, and a rotor rotatably disposed in a space formed by the armature core, and the rotor A permanent magnet type rotating electrical machine comprising a rotor shaft, a retaining ring that covers the periphery of the rotor shaft and is fixedly bonded to the rotor shaft, and a permanent magnet that is fixed to the inner peripheral surface of the retaining ring. ,
The rotor shaft forms a stepped portion at the bearing side end of the rotor shaft by making the outer diameters of both side portions smaller than the outer diameter of the portion facing the permanent magnet, and the holding ring and the permanent magnets, while being divided into two approximately in the middle portion of the axial direction, a gap of predetermined dimension between the divided surfaces, each of the retaining ring which is further divided into two, the opposite end with the split surface the permanent magnet type rotary electric machine, characterized in that parts in a state of being positioned by abutment with each of the stepped portions formed on both sides of the rotor shaft is joined and fixed to the rotor shaft. 前記隙間に、分割された各保持環の熱伸びに支障をきたさない弾性材を詰めたことを特徴とする請求項１記載の永久磁石形回転電機。 In the gap, divided according to claim 1 Symbol placement of the permanent magnet type rotary electric machine, characterized in that packed Kitasa not the elastic material problems in thermal expansion of the retaining ring was.
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JPS61116955A (en) * 1984-11-08 1986-06-04 Matsushita Electric Ind Co Ltd Rotor for motor of magnet rotation type
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JP2000020144A (en) * 1998-07-02 2000-01-21 Alps Electric Co Ltd Method for deciding whether or not battery used for power unit can be used
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