JP3438154B2 - Rotating electric machine rotor - Google Patents
Rotating electric machine rotorInfo
- Publication number
- JP3438154B2 JP3438154B2 JP14882696A JP14882696A JP3438154B2 JP 3438154 B2 JP3438154 B2 JP 3438154B2 JP 14882696 A JP14882696 A JP 14882696A JP 14882696 A JP14882696 A JP 14882696A JP 3438154 B2 JP3438154 B2 JP 3438154B2
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- iron core
- rotor
- varnish
- electric machine
- 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.)
- Expired - Fee Related
Links
Landscapes
- Induction Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Manufacture Of Motors, Generators (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は回転電機の回転子に
係り、特に、大きな電磁加振力に対しても信頼性を損な
わない回転電機の回転子に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of a rotary electric machine, and more particularly to a rotor of a rotary electric machine that does not impair reliability even with a large electromagnetic excitation force.
【０００２】[0002]
【従来の技術】従来の一般的な回転電機の回転子につい
て、図８〜図１１を用いて説明する。図８は回転電機の
回転子の断面図、図９は図８のＡ−Ａ断面図を示す。こ
れらの図に示すように、回転子の鉄心１は、回転軸２の
周りに珪素鋼板を積層した後、両端を鉄心押え３で固定
することによって形成される。導体４は鉄心１に設けた
溝に両端部が頭出しするように挿入して固定される。導
体４の両端部は短絡環６の外周側に設けた溝に挿入され
固定される。短絡環６の外周は保持環７によって補強さ
れる。また、導体４と鉄心１の溝との隙間には単一種類
のワニス８が充填され、導体４と鉄心１の溝との隙間の
幅は軸方向に一定であった。このように、従来の回転電
機の回転子には、導体の頭出部５を支持する構造がなか
ったか、もしくは導体４の頭出部５を全方向に支持する
構造を有していた。また、短絡環６の外周には保持環７
等の補強部材を備えていた。2. Description of the Related Art A conventional rotor of a general electric rotating machine will be described with reference to FIGS. 8 is a sectional view of the rotor of the rotating electric machine, and FIG. 9 is a sectional view taken along line AA of FIG. As shown in these drawings, the iron core 1 of the rotor is formed by laminating silicon steel plates around the rotating shaft 2 and then fixing both ends with iron core retainers 3. The conductor 4 is inserted and fixed in a groove provided in the iron core 1 so that both ends thereof are exposed. Both ends of the conductor 4 are inserted and fixed in grooves provided on the outer peripheral side of the short-circuit ring 6. The outer circumference of the short-circuit ring 6 is reinforced by the holding ring 7. The gap between the conductor 4 and the groove of the iron core 1 was filled with a single type of varnish 8, and the width of the gap between the conductor 4 and the groove of the iron core 1 was constant in the axial direction. As described above, the rotor of the conventional rotating electric machine does not have a structure for supporting the lead-out portion 5 of the conductor, or has a structure for supporting the lead-out portion 5 of the conductor 4 in all directions. Further, a retaining ring 7 is provided on the outer periphery of the short-circuit ring 6.
And the like.
【０００３】この種の回転電機の回転子の一例として、
特開昭５６−６６５７号公報があるが、しかし本例のも
のは、鉄心押えと導体とが溶接されているため、導体は
円周方向と同様に半径方向にも拘束されており、また、
同公報の第２図から明らかなように、鉄心および鉄心押
えの溝は、外側に行くほど幅が小さくなっており、導体
は円周方向と同様に半径方向にも拘束されている。As an example of the rotor of this type of rotary electric machine,
There is Japanese Patent Laid-Open No. 56-6657, but in this example, since the iron core holder and the conductor are welded, the conductor is constrained not only in the circumferential direction but also in the radial direction.
As is clear from FIG. 2 of the publication, the width of the iron core and the groove of the iron core retainer becomes smaller toward the outside, and the conductor is constrained in the radial direction as well as in the circumferential direction.
【０００４】[0004]
【発明が解決しようとする課題】通常、回転電機の回転
子には、溝高調波による多くの電磁加振力が作用する。
さらに、インバータ駆動電動機には、インバータ出力波
形に含まれる時間高調波成分により、運転速度とともに
周波数が変動する多くの電磁加振力が作用する。図８の
ように、導体４の両端が鉄心１から頭出しした回転電機
の回転子には、図１０のように、導体４の頭出部５が変
形して、鉄心１と短絡環６とが逆方向に振動するねじり
固有振動モードが存在し、電磁加振力と共振すれば、導
体４の頭出部５に過大な応力が発生する可能性がある。
電磁加振力は周波数が高くなるほど弱くなるので、電磁
加振力との共振により、導体４の頭出部５に過大な応力
を発生させないためには、ねじり固有振動数を十分に高
くすることが有効である。図８のような構造の回転子
は、高速車両用電動機によく用いられるが、近年の車両
高速化にしたがい、高周波数域の電磁加振力が大きくな
りつつあるため、さらに、信頼性の高い回転子構造が求
められている。Generally, a lot of electromagnetic excitation force due to groove harmonics acts on the rotor of a rotary electric machine.
Further, the inverter drive motor is subjected to a large amount of electromagnetic excitation force whose frequency varies with the operating speed due to the time harmonic components included in the inverter output waveform. As shown in FIG. 8, in the rotor of the rotating electric machine in which both ends of the conductor 4 extend from the iron core 1 as shown in FIG. 10, the lead-out portion 5 of the conductor 4 is deformed and the iron core 1 and the short-circuit ring 6 are formed. If there is a torsional natural vibration mode that vibrates in the opposite direction and resonates with the electromagnetic excitation force, there is a possibility that excessive stress will be generated in the lead-out portion 5 of the conductor 4.
Since the electromagnetic excitation force becomes weaker as the frequency becomes higher, the torsional natural frequency must be sufficiently high in order to prevent excessive stress from being generated in the heading portion 5 of the conductor 4 due to resonance with the electromagnetic excitation force. Is effective. The rotor having the structure as shown in FIG. 8 is often used in an electric motor for a high-speed vehicle, but the electromagnetic excitation force in the high frequency region is increasing with the recent increase in the vehicle speed, so that the rotor is more reliable. A rotor structure is required.
【０００５】図８に示すように、導体４の頭出部５を支
持する構造がない回転電機の回転子のねじり固有振動数
ｆｎは、図１１のように、導体４の頭出部５の長さを
ｌ、導体の本数をｎ、縦弾性率をＥ、断面二次モーメン
トをＩとし、短絡環及び保持環の質量をＭとすると、近
似的に数式（１）のようになる。ただし、Ｋは導体４の
端部の支持剛性で、数式（２）のようになる。As shown in FIG. 8, the torsional natural frequency fn of the rotor of the rotating electric machine that does not have a structure for supporting the lead-out portion 5 of the conductor 4 is as shown in FIG. Assuming that the length is 1, the number of conductors is n, the elastic modulus is E, the second moment of area is I, and the masses of the short-circuit ring and the retaining ring are M, an approximate expression (1) is obtained. However, K is the supporting rigidity of the end portion of the conductor 4, and is expressed by the equation (2).
【０００６】[0006]
【数１】 [Equation 1]
【０００７】[0007]
【数２】 [Equation 2]
【０００８】回転子は運転時に発熱して温度が高くな
り、各部材は膨張する。このとき、鉄心１（珪素鋼）と
短絡環６（銅）の半径方向の熱変形量が異なるため、導
体４の頭出部５は半径方向に曲げられて熱応力が発生す
る。この熱応力を低減するためには、熱変形を受ける頭
出部５の長さを長くすることが有効である。導体４の頭
出部５に過大な熱応力が発生しないようにするために、
数式（２）において、導体４の頭出部５の長さｌを、十
分に長くしなければならないので、導体４の頭出部５を
支持する構造のない従来の回転電機の回転子において、
数式（１）のねじり固有振動数を高くすることは困難で
あった。During operation, the rotor generates heat and its temperature rises, and each member expands. At this time, since the amounts of thermal deformation of the iron core 1 (silicon steel) and the short-circuiting ring 6 (copper) in the radial direction are different, the head portion 5 of the conductor 4 is bent in the radial direction and thermal stress is generated. In order to reduce this thermal stress, it is effective to increase the length of the heading portion 5 that undergoes thermal deformation. In order to prevent excessive thermal stress from being generated in the head portion 5 of the conductor 4,
In the formula (2), since the length l of the lead-out portion 5 of the conductor 4 must be made sufficiently long, in the rotor of the conventional rotating electric machine having no structure for supporting the lead-out portion 5 of the conductor 4,
It was difficult to increase the torsional natural frequency of the mathematical expression (1).
【０００９】また、導体４の頭出部５を支持した構造も
有るが、導体４を円周方向のみならず半径方向にも支持
していたため、導体４の頭出部５の短い部分に熱変形が
加わることになり、導体４に過大な熱応力が発生すると
いう問題があった。また、図８のように、導体４を短絡
環６の外周側に固定する構造では、導体４の端部が、回
転子回転時の遠心力によって、短絡環６の外周側に飛び
出す可能性があるため、短絡環６の外周に保持環７を設
けて補強していた。このため、数式（１）において、導
体４の端部の質量Ｍが大きくなり、ねじり固有振動数を
高くすることが困難であった。また、導体４を短絡環６
の内周側に固定する構造においても、短絡環６の外周に
保持環７を設けていたため、数式（１）において、導体
４の端部の質量Ｍが大きくなり、ねじり固有振動数を高
くすることが困難であった。There is also a structure in which the lead-out portion 5 of the conductor 4 is supported, but since the conductor 4 is supported not only in the circumferential direction but also in the radial direction, heat is applied to the short portion of the lead-out portion 5 of the conductor 4. There is a problem that the conductor 4 is deformed and excessive thermal stress is generated in the conductor 4. Further, as shown in FIG. 8, in the structure in which the conductor 4 is fixed to the outer peripheral side of the short-circuit ring 6, the end portion of the conductor 4 may fly out to the outer peripheral side of the short-circuit ring 6 due to centrifugal force when the rotor rotates. Therefore, the retaining ring 7 is provided on the outer periphery of the short-circuiting ring 6 for reinforcement. Therefore, in the formula (1), the mass M of the end portion of the conductor 4 becomes large, and it is difficult to increase the torsional natural frequency. Moreover, the conductor 4 is connected to the short-circuit ring 6
Also in the structure of fixing to the inner peripheral side of No. 3, since the retaining ring 7 is provided on the outer periphery of the short-circuit ring 6, the mass M of the end portion of the conductor 4 in Formula (1) increases, and the torsional natural frequency increases. Was difficult.
【００１０】一方、回転子が電磁加振力と共振したとき
に、導体４に局所的に過大な応力が発生しないようにす
るには、回転電機運転時における回転子の振動特性を、
一様にすることが重要である。冷却のために冷媒を軸方
向に流す構造では、冷媒の入口側と出口側で温度差が生
じ、冷媒の出口側のワニスはやわらかく、入口側のワニ
スは硬くなる。従来の回転電機の回転子には単一種類の
ワニスが用いられ、また、導体と鉄心の溝との隙間の幅
は軸方向に一定であったため、回転電機運転時に回転子
の振動特性が一様でなくなり、共振時に導体の一部に過
大な応力が発生する可能性があった。On the other hand, in order to prevent an excessive stress from being locally generated in the conductor 4 when the rotor resonates with the electromagnetic excitation force, the vibration characteristics of the rotor during operation of the rotating electric machine should be set as follows.
Uniformity is important. In the structure in which the refrigerant flows in the axial direction for cooling, a temperature difference occurs between the inlet side and the outlet side of the refrigerant, the varnish on the outlet side of the refrigerant becomes soft, and the varnish on the inlet side becomes hard. A single type of varnish is used for the rotor of a conventional rotating electric machine, and the width of the gap between the conductor and the groove of the iron core is constant in the axial direction. However, there is a possibility that excessive stress may occur in a part of the conductor at the time of resonance.
【００１１】本発明の目的は、上記問題点に鑑みなされ
たもので、回転子のねじり固有振動数を高くすることに
より、あるいは、回転子の振動特性を一様にすることに
より、回転子と電磁加振力との共振によって導体に生じ
る過大な応力の発生を防止するようにした回転電機の回
転子を提供することである。The object of the present invention has been made in view of the above-mentioned problems. The object of the present invention is to increase the torsional natural frequency of the rotor or to make the vibration characteristics of the rotor uniform, It is an object of the present invention to provide a rotor of a rotary electric machine that prevents generation of excessive stress that occurs in a conductor due to resonance with an electromagnetic excitation force.
【００１２】[0012]
【課題を解決するための手段】本発明は上記課題を以下
のように解決した。請求項１に係る発明は、回転軸と、
前記回転軸の周りに積層される鉄心と、前記鉄心に設け
た溝に両端を頭出しして挿入された導体と、前記導体と
前記鉄心の溝との隙間に充填されたワニスと、前記導体
の端部を短絡する短絡環とから構成される回転電機の回
転子において、前記ワニスは、複数種類のワニスが用い
られていることを特徴とする。回転電機の運転時の発熱
による軸方向の温度差によって、ワニスに充填位置によ
り硬軟が生じ、このため回転子の振動特性は一様でなく
なり、共振時に導体の一部に過大な応力が発生する恐れ
があるが、ワニスの種類を位置によって変えることによ
り、運転時のワニスの硬さが、全域でほぼ等しくできる
ので、運転時の回転子の振動特性が一様になり、電磁加
振力との共振による局所的な過大応力が導体に発生する
のを防止できる。また、請求項２に係る発明は、回転軸
と、前記回転軸の周りに積層される鉄心と、前記鉄心に
設けた溝に両端を頭出しして挿入された導体と、前記導
体と前記鉄心の溝との隙間に充填されたワニスと、前記
導体の端部を短絡する短絡環とから構成され、前記回転
軸方向に冷却冷媒を流す構造である回転電機の回転子に
おいて、前記ワニスは、前記冷却冷媒の入口側に軟らか
いワニスが用いられ、出口側に硬いワニスが用いられて
いることを特徴とする。運転時の発熱によって、冷媒の
入口側と出口側で温度差が生じ、従来のように、単一種
類のワニスを用いた場合、冷媒の出口側のワニスは軟ら
かく、入口側のワニスは硬くなり、そのため、回転子の
振動特性が一様にならない。上記構成によれば、冷媒の
入口側と出口側とでワニスの硬さがほぼ等しくなり、前
述のように運転時の回転子の振動特性が一様になり、電
磁加振力との共振による局所的な過大応力が導体に発生
するのを防止できる。また、請求項３に係る発明は、回
転軸と、前記回転軸の周りに積層される鉄心と、前記鉄
心に設けた溝に両端を頭出しして挿入された導体と、前
記導体と前記鉄心の溝との隙間に充填されたワニスと、
前記導体の端部を短絡する短絡環とから構成される回転
電機の回転子において、前記鉄心の溝と前記導体との隙
間の幅が、軸方向に向かって変化していることを特徴と
する。前述したように、運転時の発熱により軸方向に温
度のばらつきが生じるが、隙間の幅を変化させることに
より、軸方向全域でのワニスの支持剛性をほぼ等しくで
き、運転時の回転子の振動特性を一様にして、共振時の
過大応力の発生を防止できる。また、請求項４に係る発
明は、前記鉄心の溝または前記導体に段差を形成するこ
とにより、前記鉄心の溝と前記導体との隙間の幅が、軸
方向に、冷却冷媒の上流側から下流側に向かって減少し
ていることを特徴とするので、冷却冷媒を流す構造に単
一種類のワニスを採用でき、冷媒入口側と出口側とでワ
ニスの支持剛性をほぼ等しくでき、前述のように運転時
の回転子の振動特性が一様になり、電磁加振力との共振
による局所的な過大応力が導体に発生するのを防止でき
る。また、請求項５に係る発明は、前記導体が軸方向に
向かってテーパ状に形成されていることにより、前記鉄
心の溝と前記導体との隙間の幅が、軸方向に、冷却冷媒
の上流側から下流側に向かって減少していることを特徴
とし、上記請求項４に係る発明と同様の作用効果があ
る。The present invention has solved the above problems as follows . Invention includes a rotary shaft according to 請 Motomeko 1,
An iron core laminated around the rotating shaft, a conductor inserted into the groove provided in the iron core by squeezing out both ends, a varnish filled in a gap between the conductor and the groove of the iron core, and the conductor In a rotor of a rotary electric machine configured with a short-circuit ring that short-circuits the ends of the varnish, a plurality of types of varnish are used as the varnish. Due to the temperature difference in the axial direction due to the heat generated during the operation of the rotating electric machine, the varnish becomes hard and soft depending on the filling position, so the vibration characteristics of the rotor are not uniform and excessive stress is generated in a part of the conductor at resonance. However, by changing the type of varnish depending on the position, the hardness of the varnish during operation can be made almost equal over the entire range, so the vibration characteristics of the rotor during operation become uniform, and the electromagnetic excitation force and It is possible to prevent local overstress from occurring in the conductor due to resonance. In the invention according to claim 2 , a rotating shaft, an iron core laminated around the rotating shaft, a conductor inserted at both ends in a groove provided in the iron core, the conductor and the iron core. In the rotor of the rotating electric machine, which is composed of a varnish filled in the gap with the groove and a short-circuit ring that short-circuits the end of the conductor, and has a structure in which a cooling refrigerant flows in the rotation axis direction, the varnish is It is characterized in that a soft varnish is used on the inlet side of the cooling refrigerant and a hard varnish is used on the outlet side. Due to the heat generated during operation, a temperature difference occurs between the inlet side and the outlet side of the refrigerant.When using a single type of varnish as in the past, the varnish on the outlet side of the refrigerant becomes soft and the varnish on the inlet side becomes hard. , Therefore, the vibration characteristics of the rotor are not uniform. According to the above configuration, the hardness of the varnish is substantially equal on the inlet side and the outlet side of the refrigerant, the vibration characteristics of the rotor during operation are uniform as described above, and the resonance with the electromagnetic excitation force is caused. It is possible to prevent local overstress from occurring in the conductor. Further, the invention according to claim 3 is, a rotating shaft, an iron core laminated around the rotating shaft, a conductor inserted into the groove provided in the iron core with both ends thereof being pierced, and the conductor and the iron core. Varnish filled in the gap with the groove of,
In a rotor of a rotating electric machine configured with a short-circuit ring that short-circuits an end portion of the conductor, a width of a gap between the groove of the iron core and the conductor changes in an axial direction. . As described above, the heat generated during operation causes temperature variations in the axial direction, but by varying the width of the gap, the rigidity of supporting the varnish in the entire axial direction can be made almost equal, and the vibration of the rotor during operation can be reduced. By making the characteristics uniform, it is possible to prevent the occurrence of excessive stress at the time of resonance. Further, according to the invention of claim 4, by forming a step in the groove of the iron core or in the conductor, the width of the gap between the groove of the iron core and the conductor is set in the cooling refrigerant in the axial direction. Since it is characterized by decreasing from the upstream side to the downstream side, a single type of varnish can be adopted for the structure that flows the cooling refrigerant, and the supporting rigidity of the varnish is almost equal on the refrigerant inlet side and the outlet side. As a result, as described above, the vibration characteristics of the rotor during operation become uniform, and it is possible to prevent local overstress from occurring in the conductor due to resonance with the electromagnetic excitation force. Further, in the invention according to claim 5, since the conductor is formed in a taper shape in the axial direction, the width of the gap between the groove of the iron core and the conductor is axially upstream of the cooling refrigerant. It is characterized by decreasing from the side toward the downstream side, and has the same effect as the invention according to claim 4 above.
【００１３】[0013]
【発明の実施の形態】以下、図面を参照して本発明の実
施の形態を説明する。図１は、本発明の回転電機の回転
子の一実施形態を示す要部斜視図である。図１におい
て、鉄心２１は回転軸２２の周りに珪素鋼板を積層し、
両端を鉄心押え２３で固定することによって形成され
る。導体２４は鉄心２１に設けた溝３０に両端部が頭出
しするように挿入して固定され、その両端部を短絡環２
６により短絡されている。前述したように、回転電機の
運転時には、回転子に種々の電磁加振力が作用するが、
導体２４の両端が鉄心２１から頭出しする構造の回転電
機の回転子には、図１０のように、導体４の頭出部５が
変形して、鉄心１と短絡環６とが逆方向に振動するねじ
り固有振動モードが存在し、電磁加振力と共振すると、
導体４の頭出部５に過大な応力が発生する可能性があ
る。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an essential part showing an embodiment of a rotor of a rotary electric machine according to the present invention. In FIG. 1, the iron core 21 is formed by laminating silicon steel plates around the rotating shaft 22,
It is formed by fixing both ends with iron core retainers 23. The conductor 24 is inserted and fixed in a groove 30 provided in the iron core 21 so that both ends of the short circuit ring 2 are inserted.
Shorted by 6. As described above, various electromagnetic excitation forces act on the rotor during operation of the rotating electric machine,
In the rotor of the rotating electric machine having a structure in which both ends of the conductor 24 are located at the top of the iron core 21, as shown in FIG. 10, the lead-out portion 5 of the conductor 4 is deformed so that the core 1 and the short-circuit ring 6 move in opposite directions. When there is a torsional natural vibration mode that oscillates and resonates with the electromagnetic excitation force,
Excessive stress may occur on the head portion 5 of the conductor 4.
【００１４】回転子に作用する電磁加振力は、周波数が
高くなるほど弱くなるため、電磁加振力との共振によっ
て導体２４の頭出部２５に過大な応力を発生させないた
めには、回転子のねじり固有振動数を高くすることが有
効である。本実施形態では、鉄心押え２３の外周に、溝
３１を設けて導体２４を円周方向に支持しているため、
数式（１）における導体２４の端部の支持剛性Ｋが大き
くなり、ねじり固有振動数を高くすることができるの
で、電磁加振力との共振によって導体２４の頭出部２５
に過大な応力が発生することを防止できる。The electromagnetic excitation force acting on the rotor becomes weaker as the frequency becomes higher. Therefore, in order to prevent an excessive stress from being generated at the head portion 25 of the conductor 24 due to resonance with the electromagnetic excitation force, the rotor is It is effective to increase the torsional natural frequency of. In the present embodiment, since the groove 31 is provided on the outer periphery of the iron core retainer 23 to support the conductor 24 in the circumferential direction,
Since the supporting rigidity K of the end portion of the conductor 24 in the mathematical expression (1) is increased and the torsional natural frequency can be increased, resonance with the electromagnetic excitation force causes the head protruding portion 25 of the conductor 24.
It is possible to prevent excessive stress from being generated.
【００１５】また、回転子は運転時に発熱して温度が高
くなり、各部材は膨張する。このとき、鉄心２１（珪素
鋼）と短絡環２６（銅）の半径方向の熱変形量が異なる
ため、導体２４の頭出部２５は半径方向に曲げられて熱
応力が発生する。また、導体２４の熱変形を受ける部分
が短くなると、導体２４の頭出部２５に過大な熱応力が
発生する可能性がある。本実施形態においては、鉄心の
溝３０の幅は外周部で狭くなっており、導体２４は鉄心
の溝３０によって半径方向に支持されているが、鉄心押
え２３の溝３１の幅は一定であり、鉄心押え２３は導体
２４を半径方向に支持していない。鉄心押え２３は導体
２４の頭出部２５の半径方向の熱変形を逃がすため、導
体２４の熱変形を受ける部分の長さは変わらず、導体２
４に過大な熱応力が発生することはない。Further, the rotor heats up during operation and the temperature rises, and each member expands. At this time, the thermal deformation amounts of the iron core 21 (silicon steel) and the short-circuit ring 26 (copper) in the radial direction are different, so that the head portion 25 of the conductor 24 is bent in the radial direction and thermal stress is generated. Further, if the portion of the conductor 24 that undergoes thermal deformation becomes short, excessive thermal stress may occur at the head projecting portion 25 of the conductor 24. In the present embodiment, the width of the iron core groove 30 is narrowed at the outer peripheral portion, and the conductor 24 is supported in the radial direction by the iron core groove 30, but the width of the groove 31 of the iron core retainer 23 is constant. The core holder 23 does not support the conductor 24 in the radial direction. Since the iron core retainer 23 releases the thermal deformation in the radial direction of the head-out portion 25 of the conductor 24, the length of the portion of the conductor 24 that receives the thermal deformation does not change, and the conductor 2
No excessive thermal stress occurs in No. 4.
【００１６】図２は、本発明の回転電機の回転子の他の
実施形態を示す断面図で、導体２４の頭出部２５を円周
方向に保持する手段３３の支持位置は、図２に示すよう
に、導体２４の頭出部２５のどの部分でもよいし、導体
２４の頭出部２５を全て支持してもよい。いずれにして
も、前述の実施形態と同様に、導体頭出部の半径方向の
熱変形を逃がすため、導体に過大な熱応力の発生するこ
とが防止される。FIG. 2 is a cross-sectional view showing another embodiment of the rotor of the rotating electric machine of the present invention, and the support position of the means 33 for holding the lead-out portion 25 of the conductor 24 in the circumferential direction is shown in FIG. As shown, any portion of the lead-out portion 25 of the conductor 24 may be used, or all of the lead-out portion 25 of the conductor 24 may be supported. In any case, as in the above-mentioned embodiment, thermal deformation in the radial direction of the conductor leading-out portion is released, so that excessive thermal stress is prevented from occurring in the conductor.
【００１７】また、図３は、本発明の回転電機の回転子
のさらに他の実施形態を示す要部斜視図である。図３に
示すように、鉄心２１の溝３０に両端を頭出しして固定
された導体２４の端部は短絡環２６の内周に設けた溝３
２に挿入されて固定される。このため導体２４が遠心力
によって短絡環２６の外周側に飛び出すことはなく短絡
環２６の外周を補強する保持環２７を省略でき、前述し
た数式（１）における導体２４の端部の質量Ｍを小さく
できるため、ねじり固有振動数を高くすることができ、
電磁加振力との共振によって導体２４の頭出部２５に過
大な応力が発生することを防止できる。FIG. 3 is a perspective view of a main part showing still another embodiment of the rotor of the rotary electric machine according to the present invention. As shown in FIG. 3, the ends of the conductors 24 fixed to the groove 30 of the iron core 21 by squeezing out both ends thereof are provided on the inner circumference of the short circuit ring 26.
It is inserted in 2 and fixed. Therefore, the conductor 24 does not jump out to the outer peripheral side of the short-circuit ring 26 due to centrifugal force, and the retaining ring 27 that reinforces the outer periphery of the short-circuit ring 26 can be omitted, and the mass M of the end portion of the conductor 24 in the above-mentioned mathematical expression (1) can be reduced. Since it can be made smaller, the torsional natural frequency can be increased,
It is possible to prevent excessive stress from being generated in the head projection portion 25 of the conductor 24 due to resonance with the electromagnetic excitation force.
【００１８】また、図４は、本発明の回転電機の回転子
のさらに他の実施形態を示す要部斜視図である。本実施
形態は、冷却のために冷媒２９を軸方向に流す構造で、
冷媒２９の出口側に硬いワニス２８ａを用い、入口側に
やわらかいワニス２８ｂを用いることにより、冷媒２９
の入口側と出口側におけるワニスの硬さが、回転電機の
運転時の発熱によって、ほぼ等しくなるようにしたもの
である。FIG. 4 is a perspective view of a main part showing still another embodiment of the rotor of the rotary electric machine according to the present invention. The present embodiment has a structure in which the coolant 29 is flowed in the axial direction for cooling,
By using a hard varnish 28a on the outlet side of the refrigerant 29 and a soft varnish 28b on the inlet side, the refrigerant 29
The hardness of the varnish on the inlet side and the hardness of the outlet side are made substantially equal by the heat generated during the operation of the rotating electric machine.
【００１９】前述したように、回転子が電磁加振力と共
振したときに、導体２４に局所的に過大な応力が発生し
ないようにするには、回転電機の運転時における回転子
の振動特性を一様にすることが重要である。図５のよう
に、冷却のために冷媒２９を軸方向に流す構造では、冷
媒２９の入口側と出口側で温度差が生じるので、単一種
類のワニスを用いた場合、冷媒２９の出口側のワニスは
軟らかく、入口側のワニスは硬くなる。このため回転子
の振動特性は一様でなくなり、共振時に導体２４の一部
に過大な応力が発生する可能性がある。As described above, in order to prevent the local excessive stress from being generated in the conductor 24 when the rotor resonates with the electromagnetic excitation force, the vibration characteristics of the rotor during the operation of the rotating electric machine. Is important to be uniform. As shown in FIG. 5, in the structure in which the refrigerant 29 is allowed to flow in the axial direction for cooling, a temperature difference occurs between the inlet side and the outlet side of the refrigerant 29. Therefore, when a single type of varnish is used, the outlet side of the refrigerant 29 is The varnish is soft and the varnish on the inlet side is hard. Therefore, the vibration characteristics of the rotor are not uniform, and excessive stress may occur in a part of the conductor 24 during resonance.
【００２０】本実施形態によれば、冷媒２９の出口側に
硬いワニス２８ａを用い、入口側にやわらかいワニス２
８ｂを用いることにより、回転電機の運転時に、冷媒２
９の入口側と出口側におけるワニスの硬さが、ほぼ等し
くなるようにしているため、運転時の回転子の振動特性
が一様になり、電磁加振力との共振による局所的な過大
応力が、導体に発生するのを防止できる。According to this embodiment, a hard varnish 28a is used on the outlet side of the refrigerant 29, and a soft varnish 2 is used on the inlet side.
By using 8b, the refrigerant 2
Since the hardness of the varnish on the inlet side and the hardness of the outlet side of 9 are almost equal, the vibration characteristics of the rotor during operation are uniform, and local excessive stress due to resonance with the electromagnetic excitation force is generated. However, it can be prevented from being generated in the conductor.
【００２１】また図６は、本発明の回転電機の回転子の
さらに他の実施形態を示す要部斜視図である。本実施形
態は、図示するように、鉄心２１に段差３４を形成し、
また、導体２４に段差３５を形成して、これらの段差に
より、鉄心および導体間のワニス２８を充填する隙間の
幅を、軸方向に向かって変化させたものである。すなわ
ち、鉄心２１と導体２４との隙間の幅を、冷媒２９の入
口側で出口側より広くし、出口側のワニスの幅を減少さ
せている。FIG. 6 is a perspective view of a main part of a rotor of a rotating electric machine according to another embodiment of the present invention. In this embodiment, as shown in the figure, a step 34 is formed on the iron core 21,
Further, a step 35 is formed on the conductor 24, and the width of the gap filled with the varnish 28 between the iron core and the conductor is changed in the axial direction by the step. That is, the width of the gap between the iron core 21 and the conductor 24 is made wider on the inlet side of the refrigerant 29 than on the outlet side, and the width of the varnish on the outlet side is reduced.
【００２２】冷媒２９を軸方向に流す回転電機の回転子
では、運転時において冷媒入口側のワニス２８が冷媒出
口側より硬くなるが、本実施形態によれば、鉄心２１の
溝３０および導体２４に段差３４を形成したので、鉄心
２１と導体２４との隙間の幅が、冷媒２９の入口側で出
口側より広くなり、ワニスの幅を変化させていることに
よって、回転電機の運転時におけるワニスの支持剛性
を、冷媒２９の入口側と出口側とでほぼ等しくしてい
る。そのため、運転時に回転子の振動特性が一様にな
り、共振時に導体２４の一部に過大な応力が発生するこ
とを防止できる。In the rotor of the rotary electric machine in which the refrigerant 29 is passed in the axial direction, the varnish 28 on the refrigerant inlet side becomes harder than the refrigerant outlet side during operation, but according to this embodiment, the groove 30 of the iron core 21 and the conductor 24. Since the step 34 is formed in the varnish, the width of the gap between the iron core 21 and the conductor 24 becomes wider on the inlet side of the refrigerant 29 than on the outlet side, and the width of the varnish is changed. Has substantially the same support rigidity on the inlet side and the outlet side of the refrigerant 29. Therefore, the vibration characteristics of the rotor become uniform during operation, and it is possible to prevent excessive stress from being generated in part of the conductor 24 during resonance.
【００２３】図７は、図６のものの変形例である。鉄心
２１と導体２４の隙間の幅を変える手段としては、図６
のような段差３４、３５ではなく、図７に示すように、
導体２４自体をテーパ状に形成してもよい。あるいは、
段差とテーパとを組み合わせてもよく、また、段差また
はテーパ構造を、鉄心もしくは導体のみに用いてもよい
ことはもちろんである。FIG. 7 is a modified example of that of FIG. As means for changing the width of the gap between the iron core 21 and the conductor 24, FIG.
As shown in FIG. 7, instead of the steps 34 and 35 like
The conductor 24 itself may be formed in a tapered shape. Alternatively,
Of course, the step and the taper may be combined, and the step or taper structure may be used only for the iron core or the conductor.
【００２４】上述のとおり、これらの実施形態の回転電
機の回転子によれば、導体の頭出部を円周方向に支持し
たことにより、導体の支持剛性が向上し、ねじり固有振
動数が高くなって電磁加振力との共振によって導体の頭
出部に過大な応力が発生することを防止できる。また、
短絡環の内周側に導体を固定して保持環を省略したこと
により、導体の端部を軽量化できるため、ねじり固有振
動数が高くなり、電磁加振力との共振によって導体頭出
部に過大応力が発生することを防止できる。As described above, according to the rotors of the rotating electric machines of these embodiments, since the lead-out portion of the conductor is supported in the circumferential direction, the support rigidity of the conductor is improved and the torsional natural frequency is increased. Therefore, it is possible to prevent excessive stress from being generated at the head of the conductor due to resonance with the electromagnetic excitation force. Also,
By fixing the conductor on the inner circumference side of the short-circuit ring and omitting the retaining ring, the end of the conductor can be made lighter, the torsional natural frequency increases, and resonance with the electromagnetic excitation force causes the conductor head to exit. It is possible to prevent an excessive stress from being generated.
【００２５】さらに、回転電機運転時に、温度の高い冷
媒の出口側に硬いワニスを用い、温度の低い入口側に軟
らかいワニスを用いて、冷媒の入口側と出口側における
ワニスの硬さがほぼ等しくなるようにしているため、運
転時の回転子の振動特性が一様になり、電磁加振力との
共振によって導体に過大な応力が発生することを防止で
きる。もしくは、鉄心と導体との隙間の幅を、冷媒の入
口側で出口側より広くしてワニスの幅を変化させ、運転
時におけるワニスの支持剛性を、冷媒の入口側と出口側
とでほぼ等しくしているため、運転時の回転子の振動特
性が一様になり、電磁加振力との共振によって導体に過
大な応力が発生することを防止できる。Further, during operation of the rotating electric machine, a hard varnish is used on the outlet side of the high temperature refrigerant, and a soft varnish is used on the low temperature inlet side, so that the hardness of the varnish on the refrigerant inlet side is substantially equal to that on the outlet side. Therefore, the vibration characteristics of the rotor during operation become uniform, and it is possible to prevent excessive stress from being generated in the conductor due to resonance with the electromagnetic excitation force. Alternatively, the width of the gap between the iron core and the conductor is made wider on the inlet side of the refrigerant than on the outlet side to change the width of the varnish, and the supporting rigidity of the varnish during operation is almost equal on the inlet side and the outlet side of the refrigerant. Therefore, the vibration characteristics of the rotor during operation become uniform, and it is possible to prevent excessive stress from being generated in the conductor due to resonance with the electromagnetic excitation force.
【００２６】[0026]
【発明の効果】以上説明したように、本発明によれば、
回転電機の回転子のねじり固有振動数を高くすることに
より、あるいは、回転子の振動特性を一様にすることに
より、回転子と電磁加振力との共振による過大応力が導
体に発生するのを防止することができる。As described above, according to the present invention,
By increasing the torsional natural frequency of the rotor of the rotating electric machine or by making the rotor's vibration characteristics uniform, excessive stress due to resonance between the rotor and the electromagnetic excitation force is generated in the conductor. Can be prevented.
【図１】本発明の一実施形態を示す要部斜視図である。FIG. 1 is a perspective view of an essential part showing an embodiment of the present invention.
【図２】本発明の他の実施形態を示す断面図である。FIG. 2 is a sectional view showing another embodiment of the present invention.
【図３】本発明のさらに他の実施形態を示す要部斜視図
である。FIG. 3 is a perspective view of a main part showing still another embodiment of the present invention.
【図４】本発明のさらに他の実施形態を示す要部斜視図
である。FIG. 4 is a perspective view of a main part showing still another embodiment of the present invention.
【図５】本発明における冷却構造を説明するための斜視
図である。FIG. 5 is a perspective view for explaining a cooling structure according to the present invention.
【図６】本発明のさらに他の実施形態を示す要部斜視図
である。FIG. 6 is a perspective view of a main part showing still another embodiment of the present invention.
【図７】本発明のさらに他の実施形態を示す要部斜視図
である。FIG. 7 is a main part perspective view showing still another embodiment of the present invention.
【図８】一般的な回転電機の回転子を示す断面図であ
る。FIG. 8 is a sectional view showing a rotor of a general rotary electric machine.
【図９】図８のＡ−Ａ断面図である。9 is a cross-sectional view taken along the line AA of FIG.
【図１０】回転電機の回転子のねじり固有振動モードの
模式図である。FIG. 10 is a schematic diagram of a torsional natural vibration mode of a rotor of a rotating electric machine.
【図１１】ねじり固有振動数の説明図である。FIG. 11 is an explanatory diagram of torsional natural frequencies.
１ 鉄心 ２ 回転軸 ３ 鉄心押え ４ 導体 ５ 導体の頭出部 ６ 絡環 ７ 保持環 ８ ワニス ２１ 鉄心 ２２ 回転軸 ２３ 鉄心押え ２４ 導体 ２５ 導体の頭出部 ２６ 短絡環 ２７ 保持環 ２８ ワニス ２８ａ 硬いワニス ２８ｂ 軟らかいワニス ２９ 冷媒 ３０ 鉄心の溝 ３１ 鉄心押えの溝 ３２ 短絡環の溝 ３３ 導体頭出部を円周方向に保持する手段 ３４ 鉄心の段差 ３５ 導体の段差 1 iron core 2 rotation axes 3 Iron core holder 4 conductors 5 Cue of conductor 6 Entangled ring 7 holding ring 8 varnish 21 iron core 22 rotation axis 23 Iron core presser 24 conductors 25 Cue of the conductor 26 short-circuit ring 27 retaining ring 28 varnish 28a Hard varnish 28b Soft varnish 29 Refrigerant 30 Iron core groove 31 Iron retainer groove 32 Short-circuit ring groove 33 Means for holding conductor lead-out portion in circumferential direction 34 Iron core step 35 Conductor step
───────────────────────────────────────────────────── フロントページの続き (72)発明者 今井 勇人 茨城県日立市幸町三丁目１番１号 株式 会社 日立製作所 日立工場内 (72)発明者 石川 辰明 茨城県日立市幸町三丁目１番１号 株式 会社 日立製作所 日立工場内 (56)参考文献 特開 平４−222446（ＪＰ，Ａ) 実開 平４−58076（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H02K 17/16 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hayato Imai 3-1-1 Sachimachi, Hitachi City, Ibaraki Prefecture Hitachi Ltd. Hitachi factory (72) Inventor Tatsuaki Ishikawa 3-chome, Hitachi City, Ibaraki Prefecture No. 1 Hitachi, Ltd., Hitachi Works (56) References JP-A-4-222446 (JP, A) Fukukaihei 4-58076 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) H02K 17/16
Claims (5)
る鉄心と、前記鉄心に設けた溝に両端を頭出しして挿入
された導体と、前記導体と前記鉄心の溝との隙間に充填
されたワニスと、前記導体の端部を短絡する短絡環とか
ら構成される回転電機の回転子において、前記ワニス
は、複数種類のワニスが用いられていることを特徴とす
る回転電機の回転子。1. A rotating shaft, an iron core laminated around the rotating shaft, a conductor inserted into the groove provided in the iron core with both ends thereof being sunk, and a gap between the conductor and the groove of the iron core. In a rotor of a rotary electric machine configured by a varnish filled in a varnish, and a short-circuit ring for short-circuiting the end portion of the conductor, the varnish includes a plurality of types of varnish. Rotor.
る鉄心と、前記鉄心に設けた溝に両端を頭出しして挿入
された導体と、前記導体と前記鉄心の溝との隙間に充填
されたワニスと、前記導体の端部を短絡する短絡環とか
ら構成され、前記回転軸方向に冷却冷媒を流す構造であ
る回転電機の回転子において、前記ワニスは、前記冷却
冷媒の入口側に軟らかいワニスが用いられ、出口側に硬
いワニスが用いられていることを特徴とする回転電機の
回転子。2. A rotary shaft, an iron core laminated around the rotary shaft, a conductor inserted into the groove provided in the iron core so that both ends thereof are located, and a gap between the conductor and the groove of the iron core. In the rotor of the rotating electric machine, which is composed of a varnish filled in the varnish and a short-circuit ring that short-circuits the end of the conductor, and has a structure in which the cooling refrigerant flows in the rotation axis direction, the varnish is an inlet of the cooling refrigerant. A rotor for a rotary electric machine, wherein a soft varnish is used on the side and a hard varnish is used on the outlet side.
る鉄心と、前記鉄心に設けた溝に両端を頭出しして挿入
された導体と、前記導体と前記鉄心の溝との隙間に充填
されたワニスと、前記導体の端部を短絡する短絡環とか
ら構成される回転電機の回転子において、前記鉄心の溝
と前記導体との隙間の幅が、軸方向に向かって変化して
いることを特徴とする回転電機の回転子。3. A rotating shaft, an iron core laminated around the rotating shaft, a conductor inserted into the groove provided in the iron core with both ends thereof being sunk, and a gap between the conductor and the groove of the iron core. In a rotor of a rotary electric machine composed of a varnish filled in and a short-circuit ring that short-circuits the end of the conductor, the width of the gap between the groove of the iron core and the conductor changes in the axial direction. A rotor of a rotating electric machine characterized in that
いて、前記鉄心の溝または前記導体に段差を形成するこ
とにより、前記鉄心の溝と前記導体との隙間の幅が、軸
方向に、冷却冷媒の上流側から下流側に向かって減少し
ていることを特徴とする回転電機の回転子。4. The rotor of the rotating electric machine according to claim 3 , wherein a step is formed in the groove of the iron core or the conductor so that a width of a gap between the groove of the iron core and the conductor is axially increased. A rotor of a rotating electric machine, wherein the cooling refrigerant decreases from the upstream side to the downstream side.
いて、前記導体が軸方向に向かってテーパ状に形成され
ていることにより、前記鉄心の溝と前記導体との隙間の
幅が、軸方向に、冷却冷媒の上流側から下流側に向かっ
て減少していることを特徴とする回転電機の回転子。5. The rotor for a rotating electric machine according to claim 3 , wherein the conductor is formed in a taper shape in the axial direction, so that the width of the gap between the groove of the iron core and the conductor is A rotor of a rotating electric machine, wherein the cooling medium is reduced in axial direction from an upstream side to a downstream side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14882696A JP3438154B2 (en) | 1996-06-11 | 1996-06-11 | Rotating electric machine rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14882696A JP3438154B2 (en) | 1996-06-11 | 1996-06-11 | Rotating electric machine rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09331659A JPH09331659A (en) | 1997-12-22 |
| JP3438154B2 true JP3438154B2 (en) | 2003-08-18 |
Family
ID=15461600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14882696A Expired - Fee Related JP3438154B2 (en) | 1996-06-11 | 1996-06-11 | Rotating electric machine rotor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3438154B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4159308B2 (en) * | 2002-04-26 | 2008-10-01 | 新日本製鐵株式会社 | Rotating electric machine for vehicle and manufacturing method thereof |
| US20140339950A1 (en) * | 2013-05-18 | 2014-11-20 | Tesla Motors, Inc. | Rotor Assembly with Electron Beam Welded End Caps |
| JP6509615B2 (en) * | 2015-04-10 | 2019-05-08 | 株式会社日立製作所 | Induction machine, and induction machine drive system and railway vehicle using the same |
| JP6796449B2 (en) * | 2016-10-21 | 2020-12-09 | 東芝産業機器システム株式会社 | Synchronous reluctance type rotary electric machine |
| JP6956488B2 (en) * | 2016-12-28 | 2021-11-02 | 東芝産業機器システム株式会社 | Rotor and reluctance motor |
| JP6587773B2 (en) | 2017-03-06 | 2019-10-09 | 三菱電機株式会社 | Cage induction motor for vehicles |
-
1996
- 1996-06-11 JP JP14882696A patent/JP3438154B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09331659A (en) | 1997-12-22 |
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