JP2012092446A - Steel sheet for rotor core of ipm motor excellent in magnetic property - Google Patents
Steel sheet for rotor core of ipm motor excellent in magnetic property Download PDFInfo
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本発明は主に電気自動車やハイブリッド自動車或いは工作機械などに使用される永久磁石埋め込み型モータのロータ鉄心用鋼板及びその製造方法に関する。 The present invention relates to a steel plate for a rotor core of a permanent magnet embedded motor mainly used in an electric vehicle, a hybrid vehicle, or a machine tool, and a method for manufacturing the same.
一般に永久磁石埋め込み型モータ（以下「ＩＰＭモータ」と記す。）は、誘導電動機モータと比べ、高価な永久磁石を使用するため、コストは高くなるものの、高効率であり、ハイブリッド自動車や電気自動車の駆動用モータや発電用モータ、さらには各種工作機械用のモータとして広く使用されてきている。
ＩＰＭモータの鉄心は固定子と回転子に分けられるが、固定子側には巻線を通じて、交流磁界が直接付与されるため、高効率化のためには、鉄心には高透磁率であることと同時に、体積抵抗率を高めて、鉄損を低減する必要があった。そのため、固定子用の鉄心には、極低炭素鋼にＳｉを添加して軟磁気特性を改善した電磁鋼板が用いられている。
In general, an embedded permanent magnet motor (hereinafter referred to as an “IPM motor”) uses an expensive permanent magnet as compared with an induction motor, and thus is high in cost but is highly efficient. It has been widely used as a drive motor, a power generation motor, and a motor for various machine tools.
The core of an IPM motor is divided into a stator and a rotor. Since an AC magnetic field is directly applied to the stator through a winding, the core must have high permeability for high efficiency. At the same time, it was necessary to increase the volume resistivity and reduce the iron loss. Therefore, an electromagnetic steel sheet in which soft magnetic properties are improved by adding Si to an extremely low carbon steel is used for the iron core for the stator.
一方、回転子側には、永久磁石が埋め込まれ、鉄心は主にヨークとして磁束密度を高める役割を担っており、固定子側から発生する僅かな交流磁界の影響は受けるもののその影響は限定的であり、磁束密度は高くする必要があるが、鉄損についてはモータの性能には大きな影響を及ぼさない。したがって、鉄心材として鉄損特性に有利な電磁鋼板を使用する必要はなかった。しかし、固定子のみに電磁鋼板を使用すると、電磁鋼板の製品歩留りが低下してモータの製造コストが高くなることもあって、通常は固定子側と全く同じ電磁鋼板を素材として用いていた。
一般に、モータの効率は回転子の回転速度を高くするほど良好となるが、回転子には永久磁石を埋め込んでいるため、回転速度が速くなり過ぎると、永久磁石に働く遠心力によって回転子の突極部近傍が変形し、固定子と接触、最終的にはモータの破損に至る。
On the other hand, a permanent magnet is embedded on the rotor side, and the iron core plays a role of increasing the magnetic flux density mainly as a yoke, and although it is affected by a slight alternating magnetic field generated from the stator side, the influence is limited. Thus, the magnetic flux density needs to be increased, but the iron loss does not greatly affect the performance of the motor. Therefore, it was not necessary to use a magnetic steel sheet advantageous in iron loss characteristics as the iron core material. However, if the electromagnetic steel sheet is used only for the stator, the product yield of the electromagnetic steel sheet is reduced and the manufacturing cost of the motor is increased. Therefore, the same electromagnetic steel sheet as that of the stator side is usually used as the material.
Generally, the efficiency of a motor becomes better as the rotational speed of the rotor is increased. However, since the permanent magnet is embedded in the rotor, if the rotational speed becomes too fast, the centrifugal force acting on the permanent magnet causes the rotor to move. The vicinity of the salient pole part is deformed and comes into contact with the stator, and eventually the motor is damaged.
回転速度の限界は、回転子用鉄心の形状が同一の場合には、回転子用鉄心の降伏強度に依存するが、例えば３％程度のＳｉを含有する無方向性電磁鋼板（３５Ａ３００）の場合、磁性焼鈍後の降伏強度は約４００Ｎ／ｍｍ2程度であり、現状ではせいぜい１５０００ｒｐｍ程度までが回転速度の限界と考えられている。これまでも、電磁鋼板をベースに鉄心の降伏強度を高くする検討が種々行われている。 The limit of the rotational speed depends on the yield strength of the rotor core when the shape of the rotor core is the same. For example, in the case of a non-oriented electrical steel sheet (35A300) containing about 3% Si The yield strength after magnetic annealing is about 400 N / mm 2 , and at present, it is considered that the maximum rotational speed is about 15000 rpm. So far, various studies have been made to increase the yield strength of iron cores based on electromagnetic steel sheets.
例えば、特許文献１には磁気特性、耐変形性の優れた電磁鋼板及びその製造方法に関する発明が開示されている。また、特許文献２には、鉄損特性の内、ヒステリシス損よりも渦電流損の改善に着目し、高強度化との両立を図った鋼板及びその製造方法が開示されている。その製造方法は、Ｃを通常の電磁鋼板よりも高め、連続焼鈍設備にて変態強化することを特徴としている。
特許文献３は、強度の改善に力を注いでおり、変態や冷延により導入された転位を、低温焼鈍、ロールレベラーの通板等によって再配列させることで、高強度と高磁束密度を両立させる発明が開示されている。
Patent Document 3 focuses on improving the strength, and rearranges the dislocations introduced by transformation or cold rolling by low-temperature annealing, roll leveler threading, etc. to achieve both high strength and high magnetic flux density. The invention to be disclosed is disclosed.
しかしながら、特許文献１で提案された方法は、軟磁気特性の改善に力を注いでいるため、十分な強度が確保できない。また特許文献２で提案された方法による焼入れ処理ままではヒステリシス損が大きくなり過ぎて交流磁界を付与しても十分に励磁する事ができず、残留磁束密度も低くなる。そのため、ＩＰＭモータのリラクタンストルクが低下してモータ効率が低下する。なお、特許文献２の図２において、焼入れままの発明鋼は、同じ体積抵抗率の通常の電磁鋼板よりも渦電流損が低い値となっているが、これは、同じ条件で励磁しても、磁壁の移動が磁界の変化に追随できず、磁界の変化幅が見かけ上小さくなったためと考えられる。すなわち、特許文献２に記載のものでは、鋼中の転位密度が非常に高く、しかも複雑に絡み合っているために、励磁しても磁壁の移動が磁界の変化に追随できず、結果的に磁束密度の値が低くなっている。
特許文献３は、強度の改善に重点を置いており、高強度化に有効なSiおよびMnを多量に含有し、磁束密度の低下を招いている。
However, since the method proposed in Patent Document 1 focuses on improving the soft magnetic characteristics, sufficient strength cannot be ensured. Further, if the quenching process by the method proposed in Patent Document 2 is used, the hysteresis loss becomes too large to be sufficiently excited even when an AC magnetic field is applied, and the residual magnetic flux density is also lowered. As a result, the reluctance torque of the IPM motor is reduced and the motor efficiency is reduced. In FIG. 2 of Patent Document 2, the as-quenched invention steel has a lower eddy current loss than a normal electromagnetic steel sheet having the same volume resistivity. This is probably because the movement of the domain wall cannot follow the change of the magnetic field, and the change width of the magnetic field is apparently reduced. That is, in the thing of patent document 2, since the dislocation density in steel is very high and it is entangled intricately, even if it excites, the movement of a magnetic wall cannot follow the change of a magnetic field, As a result, magnetic flux The density value is low.
Patent Document 3 focuses on improving the strength, contains a large amount of Si and Mn effective for increasing the strength, and causes a decrease in magnetic flux density.
本発明は、このような問題を解消すべく案出されたものであり、ＩＰＭモータのロータ鉄心として用いるときにＩＰＭモータのリラクタンストルクの低下を招くことなく、降伏強度は従来材と同様でありながら、磁束密度をさらに高めることが可能なロータ鉄心用鋼板を提供することを目的とする。 The present invention has been devised to solve such problems. When used as a rotor core of an IPM motor, the yield strength is the same as that of a conventional material without causing a decrease in reluctance torque of the IPM motor. However, it aims at providing the steel plate for rotor cores which can raise magnetic flux density further.
本発明のＩＰＭモータのロータ鉄心用鋼板は、ＳｉとＭｎが鋼板の高強度化に有効であると同時に、多量に含有すると磁束密度の低下をまねく、すなわち相反する効果を有することから、発明者がＳｉとＭｎの含有量と磁気特性の関係を鋭意検討し、その結果、それらの含有量を規定することでその目的を達成したものである。すなわち、Ｃ：０．０６％超〜０．９０質量％以下、Ｓｉ：１．５質量％以下かつＭｎ：０．２質量％以下、Ｐ：０．０５質量％以下、Ｓ：０．０２質量％以下、酸可溶Ａｌ：０．００５〜３．５質量％を、Ｓｉ＋Ａｌ：５．０質量％以下なる条件で含み、必要に応じてＴｉ、Ｎｂ、Ｖの１種又は２種以上を合計で０．０１〜０．２０質量％、或いはさらに必要に応じてＭｏ：０．１〜０．６質量％、Ｃｒ：０．１〜１．０質量％及びＢ：０．０００５〜０．００５質量％の１種以上を含み、残部がＦｅ及び不可避的不純物からなる成分組成を有し、７８０Ｎ／ｍｍ２以上の降伏強度、及び４０００Ａ／ｍにおける磁束密度Ｂ４０００が１．６Ｔ以上なる磁界の強さを呈することを特徴とする。 The steel sheet for rotor cores of the IPM motor of the present invention is effective for increasing the strength of the steel sheet, while Si and Mn are effective for increasing the strength of the steel sheet. Has intensively studied the relationship between the contents of Si and Mn and the magnetic properties, and as a result, the contents have been defined to achieve the object. That is, C: more than 0.06% to 0.90 mass% or less, Si: 1.5 mass% or less and Mn: 0.2 mass% or less, P: 0.05 mass% or less, S: 0.02 mass% % Or less, acid-soluble Al: 0.005 to 3.5% by mass, Si + Al: 5.0% by mass or less, and if necessary, total of one or more of Ti, Nb, V 0.01 to 0.20% by mass, or, if necessary, Mo: 0.1 to 0.6% by mass, Cr: 0.1 to 1.0% by mass, and B: 0.0005 to 0.005. A magnetic field containing one or more of the mass%, the balance having a composition composed of Fe and inevitable impurities, a yield strength of 780 N / mm 2 or more, and a magnetic flux density B 4000 of 4000 T / m at 4000 A / m or more. It is characterized by exhibiting strength.
本発明により、強度と磁気特性がともに優れたロータ鉄心用鋼板が提供される。したがって、当該鋼板をＩＰＭモータのロータ鉄心として用いるとき、ＩＰＭモータのリラクタンストルクの低下を招くことなく、高強度で高速回転可能なＩＰＭモータのロータが得られる。
本発明により、高速回転モータの高効率化、更なる小型化が期待できる。
According to the present invention, a steel sheet for a rotor core having excellent strength and magnetic properties is provided. Therefore, when the steel plate is used as a rotor core of an IPM motor, a rotor of an IPM motor that can rotate at high speed with high strength can be obtained without causing a decrease in reluctance torque of the IPM motor.
According to the present invention, high efficiency and further miniaturization of the high-speed rotary motor can be expected.
以下に、本発明の詳細を説明する。
まず、本発明鋼板を構成する鋼の成分組成について説明する。本明細書において、含有量の範囲に関し下限値を記載せずに上限値のみを「〜質量％以下」と表現する場合がある。その場合の下限値は、対象の成分について常法の分析方法による検出限界以下であることを意味する。
Ｃ：０．０６％超〜０．９０質量％以下
７８０Ｎ/mm2以上の降伏強度を得るためには、０．０６質量％を超えるＣを含有させる必要がある。しかし、０．９０質量％を超えて含有させると、磁束密度が低くなる。
Details of the present invention will be described below.
First, the component composition of steel constituting the steel sheet of the present invention will be described. In the present specification, the upper limit value alone may be expressed as “˜mass% or less” without describing the lower limit value with respect to the content range. In this case, the lower limit value means that the target component is below the detection limit by a conventional analysis method.
C: In order to obtain a yield strength of more than 0.06% to 0.90% by mass or less and 780 N / mm 2 or more, it is necessary to contain C exceeding 0.06% by mass. However, if the content exceeds 0.90% by mass, the magnetic flux density is lowered.
Ｓｉ：１．５質量％以下
Ｓｉは、高強度化や渦電流損の低減に有効な元素である。しかし、多量に添加すると磁束密度の劣化を招くとともに、鋼板の靭性も劣化する。本出願では、添加量は１．５質量％以下とするべきである。
Ｍｎ：０．２質量％以下
Ｍｎも、高強度化や渦電流損の低減に有効な元素であるが、多量に添加すると磁束密度を劣化させてしまう。そこで、Ｍｎ以外の元素、本発明ではＳｉにより高強度化及び渦電流損の低減を行えば、過度にＭｎを含有する必要はない。所定のＳｉ含有量の範囲においてＭｎ含有量を０．２質量％以下に抑えることで磁束密度が向上し、モータトルクの向上につながる。
Si: 1.5% by mass or less Si is an element effective for increasing strength and reducing eddy current loss. However, if added in a large amount, the magnetic flux density is deteriorated and the toughness of the steel sheet is also deteriorated. In the present application, the addition amount should be 1.5% by mass or less.
Mn: 0.2% by mass or less Mn is also an element effective for increasing the strength and reducing the eddy current loss. However, if added in a large amount, the magnetic flux density is deteriorated. Therefore, if the strength is increased and the eddy current loss is reduced by an element other than Mn, in the present invention, Si, it is not necessary to contain Mn excessively. By suppressing the Mn content to 0.2% by mass or less within a predetermined Si content range, the magnetic flux density is improved, and the motor torque is improved.
Ｐ：０．０５質量％以下
Ｐは高強度化に有効な元素であるが、添加量が多いと鋼の靭性を著しく低下させ、磁束密度も低下する。０．０５質量％までは許容できるため、上限を０．０５質量％とする。
以下の３行は、岩津さんと私（坂本）の間の出願前のやりとりが明細書の中に残ったまま出願してしまったものです。気がついてすぐ、この段落を訂正する手続補正書は出しました。今回、もちろん削除します。
Ｓ：０．０２質量％以下
Ｓは高温脆化を引き起こす元素であり、大量に含有すると、熱間圧延時に表面欠陥を生じ、表面品質を劣化させる。したがって、できるだけ低減することが望まれる。０．０２％質量までは許容できるため、上限を０．０２質量％とする。
P: 0.05% by mass or less P is an element effective for increasing the strength. However, if the addition amount is large, the toughness of the steel is remarkably lowered and the magnetic flux density is also lowered. Since 0.05 mass% is acceptable, the upper limit is made 0.05 mass%.
The following three lines have been filed with the pre-application exchange between Mr. Iwatsu and me (Sakamoto) remaining in the description. As soon as I realized, I issued a procedural amendment to correct this paragraph. This time, of course, delete.
S: 0.02% by mass or less S is an element that causes high-temperature embrittlement. If it is contained in a large amount, surface defects are generated during hot rolling, and surface quality is deteriorated. Therefore, it is desired to reduce as much as possible. Since 0.02% by mass is acceptable, the upper limit is made 0.02% by mass.
酸可溶Ａｌ：０．００１〜３．５質量％、Ｓｉ＋Ａｌ≦５．０質量％
Ａｌは脱酸剤として添加されるほか、Ｓｉと同様に鋼の体積抵抗率を上昇させるのに有効な元素である。その効果を発揮するためには、少なくとも０．００５％以上含有させることが必要である。しかしＳｉとの合計で５．０質量％を越えて含有させると磁束密度の低下が大きくなり、モータの性能が劣化する。
Acid-soluble Al: 0.001 to 3.5% by mass, Si + Al ≦ 5.0% by mass
In addition to being added as a deoxidizer, Al is an element effective for increasing the volume resistivity of steel in the same manner as Si. In order to exhibit the effect, it is necessary to contain at least 0.005% or more. However, if the total content of Si exceeds 5.0% by mass, the magnetic flux density is greatly reduced and the motor performance is deteriorated.
Ｔｉ＋Ｎｂ＋Ｖ：０．０１〜０．２０質量％
Ｔｉ，Ｎｂ及びＶは、鋼中で炭窒化物を形成し、析出強化による高強度化に有効な元素である。その効果を得るためには、１種又は２種以上を合計で、０．０１質量％以上の添加が必要である。しかし、０．２０質量％を超えて添加しても、析出物の粗大化により強度上昇は飽和するとともに、製造コストの増大を招く。
Ti + Nb + V: 0.01-0.20% by mass
Ti, Nb, and V are elements that form carbonitrides in steel and are effective for increasing the strength by precipitation strengthening. In order to obtain the effect, it is necessary to add 0.01% by mass or more of one type or two or more types in total. However, even if added over 0.20% by mass, the increase in strength is saturated due to the coarsening of precipitates, and the production cost is increased.
Ｍｏ：０．１〜０．６質量％、Ｃｒ：０．１〜１．０質量％及びＢ：０．０００５〜０．００５質量％の1種以上
Ｍｏ，Ｃｒ及びＢは、鋼の焼入れ性を高め、高強度化に有効な元素である。その効果を得るためには、それぞれ単独で、設定の下限値以上の添加が必要である。しかし、それぞれの上限値を超えて添加してもその効果は飽和するととともに製造コストの増加を招く。なお、単独でも複合添加でもその効果は認められるが、複合添加する場合は、それぞれ設定した上限値の１／２を超えて添加すると、その効果に比して製造コストの上昇が大きくなるので、１／２以下の量を複合添加することが望ましい。
One or more of Mo: 0.1-0.6% by mass, Cr: 0.1-1.0% by mass and B: 0.0005-0.005% by mass are hardenability of steel. Is an element effective in increasing the strength and increasing the strength. In order to obtain the effect, it is necessary to add more than the lower limit of the setting. However, even if added in excess of the respective upper limit value, the effect is saturated and the manufacturing cost is increased. In addition, although the effect is recognized by single addition or combined addition, in the case of adding multiple additions, if the addition exceeds 1/2 of the set upper limit value, the increase in manufacturing cost will be larger than the effect, It is desirable to add in an amount of 1/2 or less.
次に、本発明のＩＰＭモータのロータ鉄心用鋼板の製造方法について説明する。
前記した通り、ＩＰＭモータのロータ鉄心用鋼板は、鋼板の成分組成の調整を特徴としている。すなわち、製造方法は冷延鋼板を製造する常法に従えばよい。上記した成分組成を有する熱延鋼板を、酸洗し、冷間圧延の後、連続焼鈍することにより製造できる。焼鈍後の冷延鋼板にスキンパス圧延等を施して、鋼板の形状を矯正することも常法に従うことができる。また、得られた冷延鋼板の少なくとも片方の表面に有機成分の絶縁皮膜、無機成分の絶縁皮膜及び有機・無機複合の成分のいずれかの絶縁皮膜を形成してもよい。
Next, the manufacturing method of the steel plate for rotor cores of the IPM motor of this invention is demonstrated.
As described above, the steel sheet for the rotor core of the IPM motor is characterized by adjusting the component composition of the steel sheet. That is, the manufacturing method may follow a conventional method for manufacturing a cold-rolled steel sheet. It can manufacture by pickling the hot-rolled steel plate which has an above-described component composition, and performing continuous annealing after cold rolling. It is also possible to follow the conventional method to correct the shape of the steel sheet by subjecting the cold-rolled steel sheet after annealing to skin pass rolling or the like. Further, an insulating film of an organic component, an insulating film of an inorganic component, and an insulating film of an organic / inorganic composite component may be formed on at least one surface of the obtained cold-rolled steel sheet.
連続焼鈍以降の工程は、例えば、次のような条件で製造すればよい。
焼鈍加熱温度：７５０℃以上
連続熱処理により高強度化を図る場合、加熱温度が７５０℃未満では十分な強度が得られない。したがって、７５０℃以上の温度に加熱する。
冷却条件：４５０℃以下まで平均冷却速度１０℃／ｓ以上で冷却、２００〜５００℃に１２０ｓ以上保持
冷却終了温度が４５０℃より高いと硬質相の体積率が小さくなり、十分な強度が得られない。また、冷却後の保持温度が２００℃未満又は保持時間が１２０ｓ未満では、転位の再配列が不十分で磁束密度が低くなる。また、保持温度が５００℃を超えると軟質化するため十分な強度が得られなくなる。
What is necessary is just to manufacture the process after continuous annealing on the following conditions, for example.
Annealing heating temperature: 750 ° C. or higher When increasing the strength by continuous heat treatment, a sufficient strength cannot be obtained if the heating temperature is less than 750 ° C. Therefore, it is heated to a temperature of 750 ° C. or higher.
Cooling conditions: Cool to 450 ° C. or lower at an average cooling rate of 10 ° C./s or higher, hold at 120 to 200 to 500 ° C. for 120 s or higher If the cooling end temperature is higher than 450 ° C., the volume fraction of the hard phase decreases and sufficient strength is obtained. Absent. On the other hand, when the holding temperature after cooling is less than 200 ° C. or the holding time is less than 120 s, rearrangement of dislocations is insufficient and the magnetic flux density is lowered. On the other hand, when the holding temperature exceeds 500 ° C., it becomes soft and sufficient strength cannot be obtained.
冷却手段
連続熱処理における冷却手段は、ガスジェット、汽水冷却、水冷ロールによる冷却、水冷など種々の方法が考えられるが、ガスジェット又は汽水冷却以外の方法では、鋼板の板形状の劣化を生じるため、ガスジェット冷却又は汽水冷却の方が望ましい。板形状が劣化すると、積層した際の占積率が劣るため、ロータのバランスがくずれ、モータ性能が劣化する。
連続熱処理後の軽冷延
冷延鋼板の製造工程では、通常、熱処理後に軽冷延（スキンパス圧延）を付与して、板形状を向上させている。この場合、伸び率は０．５〜２．０％程度である。
As the cooling means in the cooling means continuous heat treatment, various methods such as gas jet, brackish water cooling, water cooling roll, and water cooling can be considered, but methods other than gas jet or brackish water cooling cause deterioration of the plate shape of the steel sheet, Gas jet cooling or brackish water cooling is preferred. When the plate shape is deteriorated, the space factor upon lamination is inferior, so that the balance of the rotor is lost and the motor performance is deteriorated.
In the manufacturing process of the light cold-rolled cold-rolled steel sheet after the continuous heat treatment , the plate shape is usually improved by applying light cold- rolling (skin pass rolling) after the heat treatment. In this case, the elongation is about 0.5 to 2.0%.
表１に示す成分組成を有する鋼を真空溶解し、これらの連鋳片を１２５０℃に加熱し、８３０℃で仕上げ圧延して５６０℃で巻取り、板厚１．８ｍｍの熱延鋼板を得た。この熱延鋼板を酸洗後、冷間圧延して板厚０．５ｍｍの冷延鋼板を得た。
続いて、得られた冷延鋼板に対し連続焼鈍を施した。その条件は、加熱温度；８３０〜８７０℃，平均冷却速度；７５℃／ｓで２３０〜２７０℃まで冷却、更に引き続き再加熱した。再加熱温度は３８０〜４２０℃で、その温度での保持時間は、１８０秒とした。
更に、焼鈍後の鋼板に最大歪量が０．７％のスキンパス圧延を施した。
Steel having the component composition shown in Table 1 is melted in vacuum, and these continuous cast pieces are heated to 1250 ° C., finish-rolled at 830 ° C. and wound at 560 ° C. to obtain a hot-rolled steel plate having a thickness of 1.8 mm. It was. The hot-rolled steel sheet was pickled and cold-rolled to obtain a cold-rolled steel sheet having a thickness of 0.5 mm.
Subsequently, the obtained cold-rolled steel sheet was subjected to continuous annealing. The conditions were as follows: heating temperature: 830 to 870 ° C., average cooling rate: cooled to 230 to 270 ° C. at 75 ° C./s, and then reheated. The reheating temperature was 380 to 420 ° C., and the holding time at that temperature was 180 seconds.
Further, the steel plate after annealing was subjected to skin pass rolling with a maximum strain amount of 0.7%.
得られた冷延鋼板からＪＩＳ５号試験片を加工し、ＪＩＳ Ｚ ２２４１に規定された引張試験方法により、降伏強度と引張強さを測定した。また、内径３３ｍｍ、外形４５ｍｍのリング状の試験片を打抜きにより作製し、磁化測定に供した。さらに、幅１０ｍｍの短冊状のサンプルを圧延方向と平行な方向から切出し、先端ｒ０．３ｍｍおよび０．５ｍｍの９０°曲げ試験に供した。
表２に、各サンプルの降伏強さと引張強さ、曲げ試験の結果、及び４０００Ａ／ｍにおける磁束密度Ｂ４０００を示した。
曲げ試験の結果は、先端ｒ０．３ｍｍで割れ無しであったものを◎、先端ｒ０．５ｍｍで割れ無しであったものを○、先端ｒ０．５ｍｍで割れが発生したものを×で表示している。
A JIS No. 5 test piece was processed from the obtained cold-rolled steel sheet, and the yield strength and tensile strength were measured by a tensile test method defined in JIS Z 2241. Further, a ring-shaped test piece having an inner diameter of 33 mm and an outer diameter of 45 mm was produced by punching and subjected to magnetization measurement. Furthermore, a strip-shaped sample having a width of 10 mm was cut out from a direction parallel to the rolling direction, and subjected to a 90 ° bending test with the tip r of 0.3 mm and 0.5 mm.
Table 2 shows the yield strength and tensile strength of each sample, the results of the bending test, and the magnetic flux density B 4000 at 4000 A / m.
The results of the bending test are indicated by ◎ when the tip r is 0.3 mm and no crack, ○ when the tip r is 0.5 mm and no crack, and × when the tip is 0.5 mm and crack is generated. Yes.
Ｎｏ.２鋼は、Ｓｉ含有量が多いため、磁束密度Ｂ４０００が１．６Ｔ未満となっていた。
Ｎｏ．４、１６は特許文献３の発明範囲にあたりＳｉおよびＭｎの含有量がともに多いため、磁束密度Ｂ４０００が１．６Ｔ未満であった。Ｎｏ．４については、Ｎｏ．１６よりもＰ量が多いため曲げ性に劣っておりロータ形状への加工が困難であった。
一方、本願発明範囲を満足する成分組成を有するその他の鋼に関しては、高強度かつ高磁束密度を有しており、機械的強度が要求される高速回転モータに好適である。
No.2 steel, since the Si content is large, the magnetic flux density B 4000 has been a less than 1.6 T.
No. Nos. 4 and 16 are within the scope of the invention of Patent Document 3, and both the contents of Si and Mn are large. Therefore, the magnetic flux density B 4000 was less than 1.6T. No. For No. 4, no. Since the amount of P was larger than 16, the bendability was inferior and it was difficult to process into a rotor shape.
On the other hand, other steels having a component composition that satisfies the scope of the present invention have high strength and high magnetic flux density, and are suitable for high-speed rotary motors that require mechanical strength.
Claims (4)
Furthermore, one or more of Ti, Nb, and V are combined in a range of 0.01 to 0.20 mass%, Mo: 0.1 to 0.6 mass%, and Cr: 0.1 to 1.0 mass. % And B: A steel plate for a rotor core of an IPM motor according to claim 1, containing at least one of 0.0005 to 0.005 mass%.
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