JP2740553B2 - Rotating magnetic field iron loss measurement method - Google Patents
Rotating magnetic field iron loss measurement methodInfo
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- JP2740553B2 JP2740553B2 JP1200206A JP20020689A JP2740553B2 JP 2740553 B2 JP2740553 B2 JP 2740553B2 JP 1200206 A JP1200206 A JP 1200206A JP 20020689 A JP20020689 A JP 20020689A JP 2740553 B2 JP2740553 B2 JP 2740553B2
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- Prior art keywords
- rotating
- magnetic field
- magnetic material
- measuring
- energy loss
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Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、回転機、リニアモータなどのアクチュエー
タや発電機に使用される磁性材料の回転磁界中でのエネ
ルギー損失の測定法に関するものである。Description: TECHNICAL FIELD The present invention relates to a method for measuring energy loss in a rotating magnetic field of a magnetic material used for an actuator such as a rotating machine or a linear motor or a generator. .
［従来の技術］ 回転機などはインバータなどにより高周波駆動が行わ
れ、磁性材料に要求される特性、特に高周波鉄損などが
重要になってきている。[Related Art] High frequency driving is performed by a rotary machine or the like by an inverter or the like, and characteristics required for magnetic materials, particularly high frequency iron loss, etc., have become important.
珪素鋼板等の磁性材料を回転機などに使用した場合の
エネルギー損失すなわち鉄損評価は、JIS C 2550に記載
されている電磁鋼板試験方法が一般的である。しかしな
がら、この方法は励磁方向が一方向であり、回転機など
の内部で生じている回転磁界中でのエネルギー損失評価
には適さない。回転磁界中での鉄損評価法としては、鉄
損による磁性材料の温度上昇を熱電対やサーミスタを利
用して測定し、鉄損を求める方法や、磁束密度と磁界の
大きさを２次元で測定して鉄損を求める方法がある。こ
れらの方法は、局所の鉄損を求めるには適しているが実
際に使用されている形状での全鉄損を求めるには不向き
であったり、均一磁束磁界分布でしか測定できない。For evaluation of energy loss, that is, iron loss, when a magnetic material such as a silicon steel sheet is used for a rotating machine or the like, an electromagnetic steel sheet test method described in JIS C 2550 is generally used. However, this method has a unidirectional excitation direction and is not suitable for evaluating energy loss in a rotating magnetic field generated inside a rotating machine or the like. As a method for evaluating iron loss in a rotating magnetic field, the temperature rise of a magnetic material due to iron loss is measured using a thermocouple or a thermistor, and a method for obtaining iron loss, or a method of two-dimensionally measuring magnetic flux density and magnetic field magnitude. There is a method of measuring the iron loss by measuring. These methods are suitable for finding the local iron loss, but are not suitable for finding the total iron loss in the actually used shape, or can be measured only with a uniform magnetic flux magnetic field distribution.
一方、回転機などの中で、磁性材料で消費される回転
磁界による鉄損を評価するために、回転機のモデル機を
製作し、回転機特性より回転磁界鉄損を求めることは回
転機の構造などの要因が多すぎて、不可能に近く、また
時間と費用を要する。On the other hand, in order to evaluate the iron loss due to the rotating magnetic field consumed by the magnetic material in a rotating machine, a model machine of the rotating machine is manufactured, and to determine the rotating magnetic field iron loss from the rotating machine characteristics is to evaluate the rotating machine. There are too many factors, such as structure, almost impossible, and it takes time and money.
以上より、現在使用されている測定法では、回転機中
で実際に使用されている状態で磁性材料を十分に評価で
きない。従って、回転機などに使用する磁性材料につい
ての最適設計を行うにしても、回転機における磁性材料
の位置付けが明らかにできず、磁性材料の選択や形状設
計が十分にできない。As described above, the currently used measuring method cannot sufficiently evaluate a magnetic material in a state where the magnetic material is actually used in a rotating machine. Therefore, even if the optimum design is performed for the magnetic material used in the rotating machine, the positioning of the magnetic material in the rotating machine cannot be clarified, and the selection and shape design of the magnetic material cannot be sufficiently performed.
［発明が解決しようとする課題］ この発明は上記の問題点を解決するためになされたも
ので、回転磁界などの中で使用される磁性材料のエネル
ギー損失すなわち鉄損を容易に測定するものであり、し
かも、測定される材料の任意の形状あるいは使用される
状態で測定可能な回転磁界鉄損測定方法を提供するもの
である。[Problems to be Solved by the Invention] The present invention has been made to solve the above problems, and is intended to easily measure the energy loss, that is, the iron loss of a magnetic material used in a rotating magnetic field or the like. An object of the present invention is to provide a rotating field iron loss measuring method capable of measuring a material to be measured in an arbitrary shape or in a used state.
［課題を解決するための手段］ 本発明は、回転数ｎ（rpm）で回転する回転磁界中で
使用される磁性材料の、前記回転磁界中で消費されるエ
ネルギー損失を測定するにあたり、直流磁界中において
前記磁性材料を回転数ｎ（rpm）で回転させ、前記磁性
材料に誘起される回転力を測定することによりエネルギ
ー損失を求めることを特徴とする回転磁界鉄損測定方法
であり、 また、回転数ｎ（rpm）で回転する回転磁界中で使用
される磁性材料の、前記回転磁界中で消費されるエネル
ギー損失を測定するにあたり、回転磁界中において前記
磁性材料を回転数no（rpm）で回転させるとともに、前
記回転磁界を回転数ｎ＋no（rpm）で回転させ、前記磁
性材料に誘起される回転力を測定することによりエネル
ギー損失を求めることを特徴とする回転磁界鉄損測定方
法である。[Means for Solving the Problems] The present invention relates to a method for measuring the energy loss consumed in a rotating magnetic field of a magnetic material used in a rotating magnetic field rotating at a rotation speed n (rpm). A rotating magnetic field iron loss measuring method, characterized in that the magnetic material is rotated at a rotation speed n (rpm), and an energy loss is obtained by measuring a rotating force induced in the magnetic material. of the magnetic material used in a rotary magnetic field that rotates at a rotational speed n (rpm), Upon measuring the energy loss consumed in the rotating magnetic field, the magnetic material in a rotating magnetic field rotational speed n o (rpm) in is rotated, the rotating magnetic field is rotated at a rotational speed n + n o (rpm), rotating magnetic field iron and obtains the energy loss by measuring the rotational force induced in the magnetic material This is a loss measurement method.
また、前記磁性材料が、磁性材料の応用製品に使用さ
れる形状に成形されていることが好ましい。さらにま
た、回転磁界中でのエネルギー損失を測定する前記磁性
材料が、板状の磁性材料であって、積層法、接着法また
は固定法により、磁性材料の応用製品で使用される状態
に成形されていることが好ましい。Further, it is preferable that the magnetic material is formed into a shape used for an application product of the magnetic material. Furthermore, the magnetic material for measuring the energy loss in the rotating magnetic field is a plate-shaped magnetic material, which is formed by a laminating method, an adhesive method or a fixing method into a state used in an applied product of the magnetic material. Is preferred.
回転磁界中で使用されている磁性材料にエネルギー損
失があると、その磁性材料に回転力が誘起される。この
ときの誘起される回転力Ｔ（Nm）と回転磁界によるエネ
ルギー損失Ｗ（Ｗ）との関係は、エネルギーを損失する
磁性材料に対する回転磁界の回転数をｎ（rpm）とし、
円周率をπとするとＷ＝２πnT/60で表すことが可能で
あり、回転磁界中での磁性材料のエネルギー損失は磁性
材料に誘起される回転力で測定することができる。回転
力すなわちトクルは、周知のトルク測定法、例えばプー
リ法、ひずみゲージを利用したトルク−変位法、または
ヴェルトハイム効果を利用したトルク−電磁気法などで
測定することができる。When a magnetic material used in a rotating magnetic field has an energy loss, a rotational force is induced in the magnetic material. At this time, the relationship between the induced rotational force T (Nm) and the energy loss W (W) due to the rotating magnetic field is as follows: The rotating speed of the rotating magnetic field with respect to the magnetic material that loses energy is n (rpm).
Assuming that the pi is π, it can be expressed by W = 2πnT / 60, and the energy loss of the magnetic material in the rotating magnetic field can be measured by the rotational force induced in the magnetic material. The torque or torque can be measured by a well-known torque measurement method, for example, a pulley method, a torque-displacement method using a strain gauge, or a torque-electromagnetic method using the Wertheim effect.
本発明による回転磁界とは、エネルギー損失の測定を
行う磁性材料（以後、測定試料と記す。）に対する磁界
の動きを示すものであり、測定試料と外部磁界のどちら
か一方あるいは双方が回転し、測定試料に対して磁界が
回転する場合の磁界を言う。従って、磁界が固定され、
測定試料を回転数ｎ（rpm）で回転させた場合において
も、測定試料に対して回転磁界が生じることになり、測
定試料に誘起された回転力を測定することによって回転
磁界中におけるエネルギー損失を測定することができ
る。この場合、回転磁界の回転数は測定試料の回転数と
同じとなり、測定しようとする所要の回転磁界の回転数
で測定試料を回転させる。The rotating magnetic field according to the present invention indicates the movement of a magnetic field with respect to a magnetic material (hereinafter, referred to as a measurement sample) for which energy loss is to be measured. One or both of the measurement sample and the external magnetic field rotate, It refers to the magnetic field when the magnetic field rotates with respect to the measurement sample. Therefore, the magnetic field is fixed,
Even when the measurement sample is rotated at a rotation speed n (rpm), a rotating magnetic field is generated with respect to the measurement sample, and the energy loss in the rotating magnetic field is measured by measuring the rotation force induced in the measurement sample. Can be measured. In this case, the rotation speed of the rotating magnetic field is the same as the rotation speed of the measurement sample, and the measurement sample is rotated at the required rotation speed of the rotation magnetic field to be measured.
回転数ｎ（rpm）の回転磁界中の磁性材料の回転磁界
によるエネルギー損失を測定する場合に、磁性材料を、
磁気特性にあまり影響しない程度に低い回転数no（rp
m）で回転させ、外部の回転磁界の回転数をｎ＋no（rp
m）とすることにより摩擦力などによる測定誤差を低減
することができる。When measuring energy loss due to the rotating magnetic field of a magnetic material in a rotating magnetic field of a rotation speed n (rpm), the magnetic material is
Low enough not to much effect on the magnetic properties of the rotational speed n o (rp
m), and the number of rotations of the external rotating magnetic field is n + n o (rp
m) can reduce measurement errors due to frictional force and the like.
なお、この場合、回転磁界の回転数は、測定試料に対
する回転磁界の回転数がｎとなるように、測定試料と回
転磁界の回転方向を考慮する必要があることは言うまで
もない。In this case, it is needless to say that it is necessary to consider the rotation direction of the rotating magnetic field with respect to the measurement sample so that the rotation speed of the rotating magnetic field with respect to the measurement sample becomes n.
ここで、前記の誘起回転力とエネルギー損失との関係
の中に形状などの条件は含まれないので、材料の形状は
任意でよく、実際に磁性材料が応用製品で使用される使
用形状、使用状態で測定可能である。板状の磁性材料を
使用する場合、板状の磁性材料を積層法、接着法、また
は固定法などによって応用製品として組込まれる状態に
形成されていることが好ましい。Here, since conditions such as shape are not included in the relationship between the induced rotational force and energy loss, the shape of the material may be arbitrarily determined. It can be measured in a state. When a plate-shaped magnetic material is used, it is preferable that the plate-shaped magnetic material is formed in a state of being incorporated as an applied product by a lamination method, an adhesion method, a fixing method, or the like.
すなわち、磁性材料は、珪素鋼板、フェライトあるい
はそれらの複合したもの、磁性材料とその他の材料との
複合材料などいかなる種類の磁性材料でもよく、あるい
は、棒状、板状、管状、多角形状など応用製品に適用さ
れる形状に成形されているものでも測定可能である。That is, the magnetic material may be any type of magnetic material such as a silicon steel sheet, ferrite or a composite thereof, a composite material of a magnetic material and another material, or an applied product such as a bar, a plate, a tube, and a polygon. Can be measured even if it is molded into a shape applicable to
特に、磁性材料が板形状のものである場合には、通常
上記のような応用製品として使用される矩形状、円板
状、環状などの形状に形成した板状の磁性材料を接着し
あるいはボルト等で固定して応用製品に組込まれる所要
の状態にあるもの、あるいは板状の磁性材料を２枚以上
積層し、あるいは積層して接着あるいはボルト等で固定
して、応用製品に組み込まれる所要の状態にあるものな
どにおいても測定可能である。In particular, when the magnetic material is in the form of a plate, a plate-like magnetic material formed into a rectangular, disk, or annular shape, which is usually used as an applied product as described above, is bonded or bolted. In the required state to be incorporated into the application product after being fixed with the like, or by laminating two or more plate-shaped magnetic materials, or by laminating and bonding or fixing with bolts, etc. It can be measured even in a state.
磁性材料の応用製品とは、モーターなどのアクチュエ
ーターや発電機、さらに他の応用でも、回転磁界が生じ
ている場合のものを含む。The applied products of the magnetic material include actuators such as motors, generators, and other applications in which a rotating magnetic field is generated.
［実施例］ 本発明を実施例の図を参照しながら説明する。第１図
および第２図は、直流電流により得られる磁界中で円盤
状の磁性材料を回転させ、回転磁界によるエネルギー損
失を測定する装置であり、１は直流電流原、２と３は直
流磁界を発生させるコイルと鉄心、４は回転磁界による
エネルギー損失を測定する円盤状の磁性材料、５は測定
試料である磁性材料４に誘起する回転力と回転数を検出
する検出器、６は試料４を回転させるモータである。測
定試料４と鉄心３より構成される磁気回路に供給される
エネルギーは、直流電源１とモータ６である。試料４が
回転していても同じ角度になると、定常状態であれば、
磁気回路の磁束、磁界分布は同じになるので、コイル２
に誘起する電圧も同じになり、直流電源１から供給され
るエネルギーは平均すれば０となる。従って、磁気回路
に供給されるエネルギーＷは、モータ６より供給される
エネルギーだけとなり、その回転力Ｔと回転数ｎより、
Ｗ＝２πnT/60となる。磁気回路に供給されたエネルギ
ーＷは、試料４と鉄心３で消費されるが、鉄心３での磁
束変化が少なければ、試料４での回転磁界によるエネル
ギー損失となり、測定しようとする回転磁界によるエネ
ルギー損失が求められる。Embodiment The present invention will be described with reference to the drawings of the embodiment. FIGS. 1 and 2 show an apparatus for measuring the energy loss due to a rotating magnetic field by rotating a disk-shaped magnetic material in a magnetic field obtained by a DC current, wherein 1 is a DC current source, and 2 and 3 are DC magnetic fields. 4 is a disk-shaped magnetic material for measuring the energy loss due to the rotating magnetic field, 5 is a detector for detecting the rotational force and the number of revolutions induced in the magnetic material 4 as a measurement sample, and 6 is a sample 4 Is a motor for rotating. Energy supplied to the magnetic circuit composed of the measurement sample 4 and the iron core 3 is the DC power supply 1 and the motor 6. If the same angle is obtained even when the sample 4 is rotating, if it is in a steady state,
Since the magnetic flux and the magnetic field distribution of the magnetic circuit are the same, the coil 2
At the same time, and the energy supplied from the DC power supply 1 becomes 0 on average. Therefore, the energy W supplied to the magnetic circuit is only the energy supplied from the motor 6, and the energy W is given by
W = 2πnT / 60. The energy W supplied to the magnetic circuit is consumed by the sample 4 and the iron core 3. If there is little change in the magnetic flux in the iron core 3, the energy is lost due to the rotating magnetic field in the sample 4. Loss is required.
第３図および第４図は、３相電源７、磁界発生用コイ
ル８と鉄心９により得られる回転数ｎ＋noの回転磁界中
での円盤状の磁性材料10を角速度noで回転させ、回転数
ｎの回転磁界によるエネルギー損失を測定する装置であ
り、11は、測定試料である磁性材料10に誘起する回転力
と回転数を検出する検出器、12は試料を回転させるモー
タである。この場合も回転数ｎ＋noで回転する座標軸で
考えると、第１図の実施例と同じに考えることができ、
従って試料10で回転磁界によるエネルギー損失はＷ＝２
πnT/60の関係式により試料10に誘起する回転力Ｔから
求められる。試料10が停止状態である場合には、摩擦に
よる回転力の不安定が生じるが、この実施例の方法で
は、試料10をその影響がなくなるできるだけ低い回転数
で回転させているので測定精度を高めることができる。FIGS. 3 and 4 can rotate the three-phase power supply 7, a disk-shaped magnetic material 10 in a rotating magnetic field rotational speed n + n o obtained by the magnetic field generating coil 8 and the iron core 9 at an angular velocity n o, rotation This is an apparatus for measuring energy loss due to a number n of rotating magnetic fields, 11 is a detector for detecting the rotational force and the number of revolutions induced in the magnetic material 10 as a measurement sample, and 12 is a motor for rotating the sample. In this case also considered in the coordinate axis which rotates at a rotational speed n + n o, can be considered the same as the embodiment of Figure 1,
Therefore, the energy loss of the sample 10 due to the rotating magnetic field is W = 2.
It is determined from the rotational force T induced on the sample 10 by the relational expression of πnT / 60. When the sample 10 is in a stopped state, the rotational force becomes unstable due to friction. However, in the method of this embodiment, the measurement accuracy is increased because the sample 10 is rotated at a rotation speed as low as possible without the influence. be able to.
［発明の効果］ この発明の測定法によると、回転磁界でのエネルギー
損失がいかなる複雑な形状やあらゆる使用状況でも測定
することが可能であり、しかも、材料全体で消費する全
エネルギー損失として捕えられる。さらに回転磁界も磁
性材料の応用製品内で生じる同じ磁束分布をもったもの
でもよく、磁性材料の応用される状態での全エネルギー
損失が直接測定できる。従って、モータなどのアクチュ
エータや発電機の設計に必要なデータが直接得られ、こ
の分野で価値の高いものである。この発明は、アクチュ
エータや発電機だけでなく、他の応用で回転磁界が生じ
ているところで使用される磁性材料にも適用できる。[Effect of the Invention] According to the measuring method of the present invention, the energy loss in the rotating magnetic field can be measured in any complicated shape and in any use condition, and is captured as the total energy loss consumed by the entire material. . Further, the rotating magnetic field may have the same magnetic flux distribution generated in the applied product of the magnetic material, and the total energy loss in the applied state of the magnetic material can be directly measured. Therefore, data necessary for designing an actuator such as a motor or a generator can be directly obtained, which is of high value in this field. The present invention is applicable not only to actuators and generators, but also to magnetic materials used in other applications where a rotating magnetic field is generated.
第１図〜第４図は、測定試料である円盤状の磁性材料
の、回転磁界によるエネルギー損失を測定する装置であ
り、第１図は測定試料が回転している例であり、第２図
は第１図のａ矢視図である。第３図は磁界及び測定試料
を回転させて測定する実施例であり、第４図は第３図の
ｂ矢視図である。 １……直流磁界を発生させる直流電流源、２、８……磁
界を発生させるコイル、３、９……鉄心、４、10……エ
ネルギー損失を測定する磁性材料、５……測定試料であ
る磁性材料に誘起する回転力と回転数を検出する検出
器、６、12……測定試料を回転させるモータ、７……回
転磁界を発生させる３相電源。1 to 4 show an apparatus for measuring the energy loss of a disk-shaped magnetic material as a measurement sample due to a rotating magnetic field. FIG. 1 shows an example in which the measurement sample is rotating. FIG. 2 is a view as seen from the arrow a in FIG. FIG. 3 is an embodiment in which measurement is performed by rotating a magnetic field and a measurement sample, and FIG. 4 is a view taken in the direction of arrow b in FIG. 1, a direct current source for generating a DC magnetic field, 2, 8, a coil for generating a magnetic field, 3, 9, an iron core, 4, 10, a magnetic material for measuring energy loss, 5 a measurement sample. Detectors for detecting the rotational force and the number of rotations induced in the magnetic material, 6, 12,..., A motor for rotating the sample to be measured,..., A three-phase power supply for generating a rotating magnetic field.
Claims (4)
使用される磁性材料の、前記回転磁界中で消費されるエ
ネルギー損失を測定するにあたり、直流磁界中において
前記磁性材料を回転数ｎ（rpm）で回転させ、前記磁性
材料に誘起される回転力を測定することによりエネルギ
ー損失を求めることを特徴とする回転磁界鉄損測定方
法。When measuring the energy loss consumed in a rotating magnetic field of a magnetic material used in a rotating magnetic field rotating at a rotating speed of n (rpm), the rotating speed of the magnetic material in a DC magnetic field is measured. A method for measuring iron loss in a rotating magnetic field, comprising: rotating at n (rpm) and measuring a rotational force induced in the magnetic material to determine an energy loss.
使用される磁性材料の、前記回転磁界中で消費されるエ
ネルギー損失を測定するにあたり、回転磁界中において
前記磁性材料を回転数no（rpm）で回転させるととも
に、前記回転磁界を回転数ｎ＋no（rpm）で回転させ、
前記磁性材料に誘起される回転力を測定することにより
エネルギー損失を求めることを特徴とする回転磁界鉄損
測定方法。2. A method for measuring an energy loss consumed in a rotating magnetic field of a magnetic material used in a rotating magnetic field rotating at a rotating speed n (rpm). While rotating at n o (rpm), the rotating magnetic field is rotated at a rotation speed n + n o (rpm),
A method for measuring iron loss in a rotating magnetic field, comprising determining an energy loss by measuring a rotating force induced in the magnetic material.
用される形状に成形されていることを特徴とする請求項
１または２に記載の回転磁界鉄損測定方法。3. The method according to claim 1, wherein the magnetic material is formed into a shape used for an applied product of the magnetic material.
磁性材料が、板状の磁性材料であって、積層法、接着法
または固定法により、磁性材料の応用製品に組込まれる
状態に成形されていることを特徴とする請求項１または
２に記載の回転磁界鉄損測定方法。4. The magnetic material for measuring energy loss in a rotating magnetic field is a plate-like magnetic material, which is formed by a lamination method, an adhesion method or a fixing method so as to be incorporated into an applied product of the magnetic material. The method for measuring iron loss in a rotating magnetic field according to claim 1 or 2, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1200206A JP2740553B2 (en) | 1989-08-03 | 1989-08-03 | Rotating magnetic field iron loss measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1200206A JP2740553B2 (en) | 1989-08-03 | 1989-08-03 | Rotating magnetic field iron loss measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0365676A JPH0365676A (en) | 1991-03-20 |
| JP2740553B2 true JP2740553B2 (en) | 1998-04-15 |
Family
ID=16420572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1200206A Expired - Lifetime JP2740553B2 (en) | 1989-08-03 | 1989-08-03 | Rotating magnetic field iron loss measurement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2740553B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022220264A1 (en) | 2021-04-14 | 2022-10-20 | 日本製鉄株式会社 | Method for manufacturing bonded laminate core and bonded laminate core manufacturing device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004281624A (en) * | 2003-03-14 | 2004-10-07 | Toei Scientific Industrial Co Ltd | Electromagnet for measuring magnetic physical property using permalloy as core |
| JP5165614B2 (en) * | 2009-02-18 | 2013-03-21 | 公益財団法人鉄道総合技術研究所 | Simulated measurement method and apparatus for eddy current loss of ground coil conductor in superconducting magnetic levitation railway |
| JP2011220692A (en) * | 2010-04-02 | 2011-11-04 | Nippon Steel Corp | Two-dimensional magnetic characteristic measuring apparatus |
| JP6303740B2 (en) * | 2014-04-08 | 2018-04-04 | 富士通株式会社 | Magnetic characteristic measuring apparatus and control method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5935162A (en) * | 1982-08-24 | 1984-02-25 | Toshiba Corp | Apparatus for testing iron core |
| JPS61206883U (en) * | 1985-06-14 | 1986-12-27 |
-
1989
- 1989-08-03 JP JP1200206A patent/JP2740553B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022220264A1 (en) | 2021-04-14 | 2022-10-20 | 日本製鉄株式会社 | Method for manufacturing bonded laminate core and bonded laminate core manufacturing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0365676A (en) | 1991-03-20 |
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