JP5732716B2 - Motor core - Google Patents
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- JP5732716B2 JP5732716B2 JP2009269227A JP2009269227A JP5732716B2 JP 5732716 B2 JP5732716 B2 JP 5732716B2 JP 2009269227 A JP2009269227 A JP 2009269227A JP 2009269227 A JP2009269227 A JP 2009269227A JP 5732716 B2 JP5732716 B2 JP 5732716B2
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- 230000003746 surface roughness Effects 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 238000003475 lamination Methods 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 60
- 239000011162 core material Substances 0.000 description 54
- 229910052742 iron Inorganic materials 0.000 description 30
- 230000006866 deterioration Effects 0.000 description 13
- 230000006835 compression Effects 0.000 description 10
- 238000007906 compression Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 229910000976 Electrical steel Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 235000019592 roughness Nutrition 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Y02T10/641—
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- Iron Core Of Rotating Electric Machines (AREA)
Description
本発明は、モータコアに関し、特にコア外周から圧縮力が付加された場合に懸念されるコア鉄損の劣化を効果的に低減しようとするものである。 The present invention relates to a motor core, and particularly intends to effectively reduce deterioration of core iron loss, which is a concern when a compressive force is applied from the outer periphery of the core.
家庭用エアコンのコンプレッサーモータは、可変速運転が行われており、最高周波数は200〜400Hz程度であって、ＰＷＭ（Pulse Width Modulation）制御等により数kHzのキャリア周波数が重畳した状態で使用されている。
また、最近急速に普及しているハイブリッド電気自動車の駆動モータや発電機も、高出力、小型化の観点から数kHzの周波数で駆動されている。
The compressor motor of a home air conditioner is operated at variable speed, the maximum frequency is about 200-400Hz, and it is used with a carrier frequency of several kHz superimposed by PWM (Pulse Width Modulation) control etc. Yes.
In addition, drive motors and generators of hybrid electric vehicles that have been rapidly spreading recently are also driven at a frequency of several kHz from the viewpoint of high output and miniaturization.
このようなモータのコア材として使用される無方向性電磁鋼板には、高周波鉄損の低いものが要望されていて、（Si＋Al）量が３〜４質量％程度の高グレードの電磁鋼板が使用されている。 Non-oriented electrical steel sheets used as the core material of such motors are required to have low high-frequency iron loss, and high-grade electrical steel sheets with a (Si + Al) content of about 3 to 4% by mass are used. Has been.
ところで、コンプレッサーモータでは、コア締結に焼きばめが適用されているため、モータコアはその外周から100MPa程度の圧縮力が付加された状態で使用されている。また、ハイブリッドＥＶ（Electric Vehicle）の駆動モータにも、樹脂モールド等が施されることから、モータコアにはその外周から圧縮力が付加されることとなる。
しかしながら、このような圧縮応力下では電磁鋼板の磁気特性は大きく劣化することが知られている。
By the way, in compressor motors, shrink fitting is applied for core fastening, so the motor core is used in a state where a compression force of about 100 MPa is applied from the outer periphery thereof. Moreover, since the resin mold etc. are given also to the drive motor of hybrid EV (Electric Vehicle), compression force will be added to the motor core from the outer periphery.
However, it is known that the magnetic properties of the electrical steel sheet are greatly deteriorated under such compressive stress.
圧縮応力下での鉄損特性を改善するものとして、例えば特許文献１には、Si：2.6〜４％、比抵抗：50〜75×10-8Ωm、結晶粒径：60〜165μmとした無方向性電磁鋼板が開示されている。 For example, Patent Document 1 discloses that Si: 2.6 to 4%, specific resistance: 50 to 75 × 10 −8 Ωm, and crystal grain size: 60 to 165 μm are provided to improve the iron loss characteristics under compressive stress. A grain-oriented electrical steel sheet is disclosed.
しかしながら、特許文献１に開示の材料を用いても、コア外周からの圧縮力付与による鉄損劣化代の改善量は従来材に比べて著しく多いわけではなく、そのため、かかる圧縮力下での鉄損の劣化を抑制する手法が求められている。 However, even if the material disclosed in Patent Document 1 is used, the amount of improvement in the iron loss deterioration allowance due to the application of compressive force from the outer periphery of the core is not significantly greater than that of the conventional material. There is a need for a technique for suppressing the deterioration of loss.
本発明は、上記の要請に有利に応えるもので、コア外周から圧縮力が付加された状態での使用に際しても鉄損の劣化を効果的に軽減することができる、モータコアについて提案することを目的とする。 The present invention advantageously responds to the above-described demand, and an object of the present invention is to propose a motor core that can effectively reduce the deterioration of iron loss even when used in a state where a compression force is applied from the outer periphery of the core. And
さて、発明者らは、上記の問題を解決すべく鋭意検討を重ねたところ、モータコアの積層方向に圧縮力を付与することにより、焼きばめ時等に付加されるステータの周方向への圧縮応力に起因した鉄損の劣化が効果的に軽減されること、そして用いる電磁鋼板の表面粗さを規制することが鉄損劣化のさらなる抑制に有効であること、の知見を得た。
本発明は上記の知見に立脚するものである。
Now, the inventors have intensively studied to solve the above problems, and by applying a compressive force in the motor core laminating direction, compression in the circumferential direction of the stator added during shrink fitting or the like. The present inventors have obtained knowledge that the deterioration of iron loss due to stress is effectively reduced, and that the regulation of the surface roughness of the electrical steel sheet to be used is effective in further suppressing the deterioration of iron loss.
The present invention is based on the above findings.
すなわち、本発明の要旨構成は次のとおりである。
ティース部とバックヨーク部を有する電磁鋼板の積層体で構成されるステータをそなえ、該ステータの周方向に10MPa以上の圧縮応力が付与されるモータのコアにおいて、該バックヨークの積層方向に0.3MPa以上の圧縮応力が付与されているとともに、前記電磁鋼板の表面粗さを最大高さで５〜50μmとすることを特徴とするモータコア。
That is, the gist configuration of the present invention is as follows.
In a motor core having a stator composed of a laminate of electromagnetic steel sheets having a tooth portion and a back yoke portion, and applying a compressive stress of 10 MPa or more in the circumferential direction of the stator, 0.3 MPa in the lamination direction of the back yoke A motor core characterized in that the above-described compressive stress is applied, and the surface roughness of the electromagnetic steel sheet is 5 to 50 μm at the maximum height.
本発明によれば、ステータの円周方向に圧縮応力が付加された使用状態下においても、鉄損の低いモータコアを得ることができる。
従って、本発明のモータコアを用いることにより、焼きばめや樹脂モールド等によりコア材料に圧縮力が付加されるエアコンコンプレッサーモータや、ハイブリッドＥＶ用駆動モータ、ＥＶ用駆動モータ、ＦＣＥＶ用駆動モータ、高速発電機等において、その鉄損を低減することが可能となる。
According to the present invention, a motor core having a low iron loss can be obtained even in a use state in which a compressive stress is applied in the circumferential direction of the stator.
Accordingly, by using the motor core of the present invention, an air conditioner compressor motor in which a compression force is applied to the core material by shrink fitting, resin molding, etc., a hybrid EV drive motor, an EV drive motor, an FCEV drive motor, a high speed In a generator or the like, the iron loss can be reduced.
以下、本発明の解明経緯について説明する。
家電用エアコンコンプレッサーモータやハイブリッド電気自動車用のモータでは、コアを固定するために、ハウジングの焼きばめやハウジングへの圧入が行われる。この焼きばめや圧入によりモータコアに付加される圧縮応力は20〜150MPa程度と言われており、かような圧縮応力下での鉄損劣化抑制手法が望まれていた。
The elucidation process of the present invention will be described below.
In an air conditioner compressor motor for home appliances or a motor for a hybrid electric vehicle, a shrink fit of the housing or press-fitting into the housing is performed to fix the core. The compressive stress applied to the motor core by shrink fitting or press fitting is said to be about 20 to 150 MPa, and a technique for suppressing iron loss deterioration under such compressive stress has been desired.
まず、発明者らは、このような圧縮応力下での鉄損特性について詳細な検討を行ったところ、圧縮応力によってヒステリシス損だけでなく渦電流損も増加することが明らかとなった。ハイブリッドＥＶモータやエアコンコンプレッサーモータは高周波域で駆動されるだけでなく、インバーター制御が行われているため数kHzの高調波も加わっていることから、渦電流損による鉄損劣化を抑制することが重要となる。 First, the inventors conducted a detailed study on the iron loss characteristics under such compressive stress, and found that not only hysteresis loss but also eddy current loss increases due to the compressive stress. Hybrid EV motors and air-conditioner compressor motors are not only driven in the high frequency range, but are also controlled by the inverter, so harmonics of several kHz are added, so iron loss deterioration due to eddy current loss can be suppressed. It becomes important.
そこで、発明者らは、この渦電流損劣化の原因について検討したところ、ステータコア（モータコア）に圧縮応力が付加された場合、それを緩和するためにコアを構成する電磁鋼板の板面方向に磁化ベクトルが向き、この状態で磁化されると板面内で渦電流が流れ、これが鉄損劣化の原因であることが明らかとなった。 Thus, the inventors examined the cause of this eddy current loss degradation. When compression stress is applied to the stator core (motor core), the magnetism is magnetized in the direction of the surface of the electrical steel sheet constituting the core in order to mitigate it. When the vector is oriented and magnetized in this state, an eddy current flows in the plate surface, and it has become clear that this is the cause of iron loss deterioration.
そこで、さらに発明者らは、磁化ベクトルが電磁鋼板の板面方向を向くことを抑制することが渦電流損抑制の観点で重要と考え、その対策として、電磁鋼板の板面方向すなわちコアにおける積層方向に応力を付与することに想い至った。 Therefore, the inventors further consider that it is important from the viewpoint of suppressing eddy current loss that the magnetization vector is directed in the direction of the plate surface of the electromagnetic steel sheet. I came up with the idea of applying stress in the direction.
上記の考えを検証するため、板厚：0.35mmの３質量％Si鋼板を用い、12スロットのステータコアを打ち抜きにより作製した。ここで、ステータ外径は100mm、積み厚は60mmとした。
ついで、このコアに、焼きばめ代：5〜50μmで焼きばめを行った。その際、コアバック中央部の円周方向の圧縮応力を歪みゲージを用いて測定したところ、円周方向の圧縮応力（焼きばめ応力）は５〜50MPaであった。
ついで、積層方向に圧縮応力を付与するため、図１に示すように、バックヨーク部１に非磁性ステンレス鋼で作製したリング２を取り付け、このリング２を油圧プレスでコア積層方向に締めることにより、種々の圧縮力を付与した。その際の圧縮力は、リングとステータコア間に感圧紙を挟むことにより測定した。なお、図１中、番号３はティース部、４は焼きばめリング（ハウジング）である。
In order to verify the above idea, a 12-slot stator core was manufactured by punching using a 3 mass% Si steel plate having a thickness of 0.35 mm. Here, the stator outer diameter was 100 mm, and the stacking thickness was 60 mm.
Subsequently, the core was shrink-fitted with a shrinkage allowance of 5 to 50 μm. At that time, when the compressive stress in the circumferential direction of the central portion of the core back was measured using a strain gauge, the compressive stress in the circumferential direction (shrink fit stress) was 5 to 50 MPa.
Next, in order to apply a compressive stress in the stacking direction, as shown in FIG. 1, a ring 2 made of nonmagnetic stainless steel is attached to the back yoke portion 1, and this ring 2 is tightened in the core stacking direction with a hydraulic press. Various compressive forces were applied. The compression force at that time was measured by sandwiching a pressure sensitive paper between the ring and the stator core. In FIG. 1, reference numeral 3 denotes a tooth portion and 4 denotes a shrink-fitting ring (housing).
図２に、ステータコアの円周方向の圧縮応力がコア鉄損に及ぼす影響ついて調べた結果を示す。なお、ステータコアの鉄損は、バックヨーク部の非磁性体の上から励磁コイル、ピックアップコイルを巻き線することにより、ステータコア円周方向の鉄損を測定することにより行った。
同図に示したとおり、コア外周からの圧縮応力が10MPa以上になると、鉄損の劣化が顕著になることが確認された。
FIG. 2 shows the result of examining the influence of the circumferential compressive stress of the stator core on the core iron loss. The iron loss of the stator core was measured by measuring the iron loss in the circumferential direction of the stator core by winding an excitation coil and a pickup coil from above the nonmagnetic material of the back yoke portion.
As shown in the figure, it was confirmed that when the compressive stress from the outer periphery of the core is 10 MPa or more, the deterioration of the iron loss becomes remarkable.
図３に、焼きばめ応力（円周方向の圧縮応力）が30MPaであるモータコアおよびかような焼きばめを行わなかったモータコアについて、積層方向（板厚方向）に圧縮力を付与した際の付与応力とコア鉄損との関係について調査した結果を示す。
同図から明らかなように、焼きばめを行わない場合は、積層方向に圧縮力を付与しても鉄損の変化はほとんどなかったが、焼きばめを行った場合には、積層方向に圧縮力を付与することによって、鉄損が大きく改善されることがわかる。特に付与応力が0.3MPa以上の場合に改善代が大きいことが判明した。
そこで、本発明では、積層方向の圧縮応力は0.3MPa以上、より好ましくは0.5MPa以上、さらに好ましくは３MPa以上とした。但し、積層方向に付与する圧縮応力があまりに大きいと、コア変形等の弊害を招くおそれがあるので、付与応力は100MPa以下とすることが好ましい。
FIG. 3 shows a motor core having a shrink fit stress (circumferential compressive stress) of 30 MPa and a motor core not subjected to such shrink fit when compressive force is applied in the stacking direction (plate thickness direction). The result of investigating the relationship between applied stress and core iron loss is shown.
As is clear from the figure, there was almost no change in iron loss even when compressive force was applied in the stacking direction when shrink fitting was not performed, but in the stacking direction when shrink fitting was performed. It can be seen that the iron loss is greatly improved by applying the compressive force. In particular, it was found that the improvement allowance was large when the applied stress was 0.3 MPa or more.
Therefore, in the present invention, the compressive stress in the stacking direction is set to 0.3 MPa or more, more preferably 0.5 MPa or more, and further preferably 3 MPa or more. However, if the compressive stress applied in the stacking direction is too large, there is a risk of adverse effects such as core deformation. Therefore, the applied stress is preferably 100 MPa or less.
ここで、板厚方向の圧縮応力は、焼きばめ応力が付与されるバックヨークの平均応力であり、バックヨーク全面において均一に付与されることが好ましい。
そして、板厚方向に圧縮力を付与する方法としてはどのような手法でも構わないが、例えば、上述したようにモータコアの両端にリング状のあて板を当て、ボルト等にてあて板を締め付ける方法、プレス等にてコアに積層方向の圧縮力を作用させた状態で、コア端面を溶接する方法、等が挙げられる。
Here, the compressive stress in the plate thickness direction is an average stress of the back yoke to which shrink fit stress is applied, and is preferably applied uniformly over the entire back yoke.
And, any method may be used as a method of applying the compressive force in the plate thickness direction. For example, as described above, a ring-shaped contact plate is applied to both ends of the motor core, and the contact plate is tightened with a bolt or the like. And a method of welding the end face of the core in a state in which a compressive force in the stacking direction is applied to the core with a press or the like.
なお、従来のモータコアにおいても、カシメ等により積層方向に圧縮力が付加される場合があるが、その場合の圧縮応力は0.2MPa以下程度の小さなものであり、またこの技術は、焼きばめ応力に起因した鉄損劣化を抑制することを狙いとしたものではなく、単にコアを固定することを目的としたものである。
また、ボルト締めにより固定されるモータコアも存在し、積層方向に圧縮力が加わっている場合もあるが、ボルト締めによる圧縮力はボルト近傍のみであり、磁束が主に流れているバックヨークには圧縮力はほとんど作用していない。しかも、ボルト締めにより固定されたモータコアに焼きばめを施すことは従来行われておらず、ボルト締めの目的は焼きばめ応力に起因した特性劣化を抑制するためのものではない。
Even in the conventional motor core, a compressive force may be applied in the stacking direction by caulking or the like, but the compressive stress in that case is as small as about 0.2 MPa or less, and this technique is a shrink fit stress. It is not intended to suppress the iron loss deterioration caused by the above, but simply intended to fix the core.
Also, there are motor cores that are fixed by bolting, and compression force may be applied in the stacking direction, but the compression force by bolting is only in the vicinity of the bolt, and the back yoke where the magnetic flux mainly flows The compressive force is hardly acting. In addition, it has not been conventionally performed to shrink fit the motor core fixed by bolt tightening, and the purpose of the bolt tightening is not to suppress characteristic deterioration caused by shrink fit stress.
次に、モータコアの鉄損に及ぼす電磁鋼板の表面粗さの影響を調査した。
板厚：0.30mmの４質量％Si鋼板を種々の表面粗さを有するロールで圧延することにより、表面粗さを最大高さ（Ｒmax：JIS Ｂ0601-1982)で１〜40μmの範囲に変化させた鋼板の
両面に、片面当たりの被膜厚さ0.6μmの厚みの半有機被膜を塗布し、外径：100mmのステータコアを作製し、図１に示したようにしてモータコアを作製後、鋼板の表面粗さと鉄損との関係について調査した。その結果を、図４に示す。なお、円周方向の圧縮応力は30MPaであり、また積層方向への付与応力は３MPaとした。
同図に示したとおり、積層方向に圧縮力を付与しない場合には鉄損に及ぼす表面粗さの影響は認められなかったが、３MPaの圧縮応力を付与した場合には、表面粗さが５μm未満になると、鉄損が増加することがわかる。この原因は、圧縮力を付与した材料では端面の短絡が生じ易くなっているためと考えられる。よって、表面粗さは５μm以上とする。また、表面粗さが50μmを超えると、占積率が著しく低下しモータ効率が低下する。
従って、電磁鋼板の表面粗さは、最大高さで５μm以上50μm以下とする。
Next, the influence of the surface roughness of the electrical steel sheet on the iron loss of the motor core was investigated.
Thickness: Rolling a 4 mass% Si steel sheet with a thickness of 0.30mm with rolls having various surface roughnesses, the surface roughness is changed to the maximum height (Rmax: JIS B0601-1982) in the range of 1 to 40 μm. A semi-organic coating with a film thickness of 0.6 μm per side was applied to both sides of the steel plate to produce a stator core with an outer diameter of 100 mm. After producing the motor core as shown in FIG. The relationship between roughness and iron loss was investigated. The result is shown in FIG. The compressive stress in the circumferential direction was 30 MPa, and the applied stress in the stacking direction was 3 MPa.
As shown in the figure, the effect of surface roughness on iron loss was not observed when no compressive force was applied in the stacking direction. However, when a compressive stress of 3 MPa was applied, the surface roughness was 5 It can be seen that the iron loss increases when the thickness is less than μm. This is considered to be because the end face is easily short-circuited in the material to which the compressive force is applied. Therefore, the surface roughness is 5 μm or more. On the other hand, when the surface roughness exceeds 50 μm, the space factor is remarkably lowered and the motor efficiency is lowered.
Therefore, the surface roughness of the electrical steel sheet is 5 μm or more and 50 μm or less at the maximum height.
なお、鋼板の表面粗さを高める方法はどのようなものでも構わないが、前述のような所定の表面粗さを有するロールで圧延する方法のほか、例えば、絶縁被膜中に直径２μm以上の無機系の粒子を混入させる等の方法がある。 Any method for increasing the surface roughness of the steel sheet may be used. In addition to the method of rolling with a roll having the predetermined surface roughness as described above, for example, an inorganic film having a diameter of 2 μm or more in an insulating film. There are methods such as mixing system particles.
Siを４質量％含有し、板厚が0.30mmの無方向性電磁鋼板に、直径２〜60μmの無機系粒子を混入させた半有機被膜を塗布することにより、鋼板の表面粗さを変化させた。これらを素材として、12スロットのステータコアをクリアランス：５％の金型にて打ち抜いた。ここで、ステータ外径は100mm、積み厚は60mmとした。ついて得られたステータコアに焼きばめ代：０〜50μmで焼きばめを行った。その際、コアバック中央部の円周方向の圧縮応力を歪みゲージを用いて測定した。ついで、積層方向に圧縮力を付与するため、図１に示したように、バックヨーク部に非磁性ステンレスで作製したリングを取り付け、リングを油圧プレスでコア積層方向に締めることにより圧縮力を変化させた。その際の圧縮応力は、リングとステータコア間に感圧紙を挟むことにより測定した。
かくして得られたステータコアの鉄損Ｗ１０／１ｋ（W/kg）について調べた結果を、表１に示す。
By applying a semi-organic coating mixed with inorganic particles with a diameter of 2 to 60 μm on a non-oriented electrical steel sheet containing 4% by mass of Si and having a thickness of 0.30 mm, the surface roughness of the steel sheet is changed. It was. Using these as materials, a 12-slot stator core was punched with a 5% clearance mold. Here, the stator outer diameter was 100 mm, and the stacking thickness was 60 mm. The stator core thus obtained was shrink-fitted at a shrinkage allowance of 0 to 50 μm. At that time, the compressive stress in the circumferential direction at the center of the core back was measured using a strain gauge. Next, to apply compressive force in the stacking direction, as shown in FIG. 1, a ring made of nonmagnetic stainless steel is attached to the back yoke, and the compressive force is changed by tightening the ring in the core stacking direction with a hydraulic press. I let you. The compressive stress at that time was measured by sandwiching a pressure sensitive paper between the ring and the stator core.
Table 1 shows the results of examining the iron loss W 10 / 1k (W / kg) of the stator core thus obtained.
また、このステータコアを用いて、ステータ外径：100mm、ロータ外径：70mm、積み厚：60mmで、８極、12スロットの内部磁石埋込型モータ（ＩＰＭモータ）を作製し、トルクおよび回転数を種々に変化させたときの最大モータ効率を測定した結果も表１に示す。
なお、表１には、鋼板の表面粗さ、焼きばめ応力（円周方向の圧縮応力）および積層方向に付与した圧縮応力も併せて示す。
Also, using this stator core, a stator outer diameter: 100 mm, rotor outer diameter: 70 mm, stacking thickness: 60 mm, an 8-pole, 12-slot embedded internal magnet motor (IPM motor), and torque and rotation speed Table 1 also shows the results of measurement of the maximum motor efficiency when various changes are made.
Table 1 also shows the surface roughness of the steel sheet, shrink-fit stress (circumferential compressive stress), and compressive stress applied in the stacking direction.
同表から明らかなように、本発明に従い、バックヨークの積層方向（鋼板の板厚方向）に0.3MPa以上の圧縮応力を付与し、かつ鋼板の表面粗さを２〜50μmの範囲とすることにより、焼きばめ応力に起因した鉄損劣化を軽減できることが分かる。 As is clear from the table, according to the present invention, compressive stress of 0.3 MPa or more is applied in the stacking direction of the back yoke (the thickness direction of the steel plate), and the surface roughness of the steel plate is in the range of 2 to 50 μm. Thus, it can be seen that iron loss deterioration due to shrink fit stress can be reduced.
１ バックヨーク部
２ リング
３ ティース部
４ 焼きばめリング（ハウジング）
1 Back yoke part 2 Ring 3 Teeth part 4 Shrink fit ring (housing)
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