JP5576840B2 - Magnetic characteristic measuring sensor and magnetic characteristic measuring method using the same - Google Patents

Magnetic characteristic measuring sensor and magnetic characteristic measuring method using the same Download PDF

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JP5576840B2
JP5576840B2 JP2011188653A JP2011188653A JP5576840B2 JP 5576840 B2 JP5576840 B2 JP 5576840B2 JP 2011188653 A JP2011188653 A JP 2011188653A JP 2011188653 A JP2011188653 A JP 2011188653A JP 5576840 B2 JP5576840 B2 JP 5576840B2
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和 中畑
ボルコヴスキー バルトッシュ
正人 榎園
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国立大学法人 大分大学
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本発明は、永久磁石の磁気特性を測定するための磁気特性測定センサー及び同センサーを用いた磁気特性測定方法に関するものである。   The present invention relates to a magnetic property measuring sensor for measuring magnetic properties of a permanent magnet and a magnetic property measuring method using the sensor.

永久磁石は、磁束密度や磁界強度や磁化をパラメーターとして用いて磁気特性が評価される。そして、永久磁石の磁気特性を測定する方法としては、日本工業規格に「永久磁石試験方法」として規格されている（非特許文献１参照。）。   Permanent magnets are evaluated for magnetic properties using magnetic flux density, magnetic field strength, and magnetization as parameters. And as a method of measuring the magnetic characteristic of a permanent magnet, it is standardized as a “permanent magnet test method” in Japanese Industrial Standards (see Non-Patent Document 1).

この日本工業規格で定められた「永久磁石試験方法」によれば、測定対象となる永久磁石と電磁石とで閉磁気回路を構成し、磁束密度を測定するためのＢコイルと磁気分極の測定に用いるＪコイルと磁界強度を測定するＨセンサーとを用いて、永久磁石の磁気特性を測定する。   According to the “permanent magnet test method” defined in the Japanese Industrial Standard, a closed magnetic circuit is constituted by a permanent magnet and an electromagnet to be measured, and the B coil and magnetic polarization for measuring the magnetic flux density are measured. The magnetic characteristics of the permanent magnet are measured using the J coil to be used and the H sensor for measuring the magnetic field strength.

ここで、永久磁石の磁束密度は、永久磁石の周囲にＢコイルを巻回し、Ｂコイルの誘導電圧を積分することで測定する。また、永久磁石の磁化（磁気分極）は、永久磁石の周囲にＪコイルを巻回するとともに永久磁石の周囲に巻回していないＢコイルをＪコイルに互いに電気的に打ち消し合うように接続することでＢコイルを空隙補償コイルとして用い、Ｊコイルの誘導電圧を積分することで測定する。また、磁界強度は、永久磁石の側方近傍にフラットサーチコイルや磁気ポテンショメーターやホールプローブなどのＨセンサーを配置して測定する。   Here, the magnetic flux density of the permanent magnet is measured by winding a B coil around the permanent magnet and integrating the induced voltage of the B coil. The magnetization (magnetic polarization) of the permanent magnet is such that the J coil is wound around the permanent magnet and the B coil not wound around the permanent magnet is electrically connected to the J coil so as to cancel each other. The B coil is used as the air gap compensation coil, and the measurement is performed by integrating the induced voltage of the J coil. The magnetic field strength is measured by arranging an H sensor such as a flat search coil, a magnetic potentiometer, or a hall probe near the side of the permanent magnet.

日本工業規格 ＪＩＳ Ｃ２５０１ 「永久磁石試験方法」Japanese Industrial Standard JIS C2501 “Permanent Magnet Test Method”

ところが、上記した日本工業規格で定められた「永久磁石試験方法」では、永久磁石の磁界強度や磁化の測定において必ずしも測定誤差が十分小さいものとは言えず、永久磁石の磁界強度や磁化といった磁気特性を正確に評価することが困難であった。   However, the “permanent magnet test method” defined in the above Japanese Industrial Standards does not necessarily have a sufficiently small measurement error in the measurement of the magnetic field strength and magnetization of the permanent magnet. It was difficult to accurately evaluate the characteristics.

本発明の特徴とするところは、次の(1)〜(2)の通りである。
(1) 永久磁石の外周に装着して磁気特性を測定するための磁気特性測定センサーにおいて、
永久磁石の試験片２を挿通させる中空部９を形成し外周部の中央部の円周方向にコイル溝１０を形成した円筒状でセラミック製の内側ホルダー７を備え、前記内側ホルダー７のコイル溝１０に、永久磁石の磁束密度を測定するためのＢコイル４と、前記Ｂコイル４の外周に絶縁シート１１を介して永久磁石の磁界強度の測定に用いるＨコイル５とを巻回し、前記内側ホルダー７を挿通して収容する中空部１２を形成し外周部の中央部の円周方向にコイル溝１３を形成した円筒状でセラミック製の外側ホルダー８を備え、前記外側ホルダー８のコイル溝１３に永久磁石の磁化の測定に用いるＭコイル６を巻回し、前記Ｍコイルの外周に絶縁シート１４を配置し、前記Ｂコイル４と前記Ｈコイル５と前記Ｍコイル６とは互いに同軸状に巻回し且つ前記Ｂコイル４と前記Ｈコイル５は巻数を同一にすると共に前記Ｂコイル４と前記Ｍコイル６の巻数及び断面積との積を同一にして、永久磁石の磁束密度と磁界強度と磁化とを測定することを特徴とする磁気特性測定センサー。
(2) 前記(1)に記載の磁気特性測定センサーを永久磁石の試験片２の伸延方向の中央部の外周に装着し、前記磁気特性測定センサーの前記Ｂコイル４の誘導電圧を積分して磁束密度を測定し、前記Ｂコイル４と前記Ｍコイル６を直列に接続し経時的に測定した電圧を積分した値から磁化を測定し、前記Ｂコイル４と前記Ｈコイル５の各々で経時的に測定した電圧の差を積分した値から磁界強度を測定することを特徴とする磁気特性測定方法。
The features of the present invention are as follows (1) to (2).
(1) In a magnetic property measurement sensor for measuring magnetic properties attached to the outer periphery of a permanent magnet,
A cylindrical ceramic inner holder 7 having a hollow portion 9 through which a permanent magnet test piece 2 is inserted and a coil groove 10 formed in the circumferential direction of the central portion of the outer peripheral portion is provided, and the coil groove of the inner holder 7 is provided. 10, a B coil 4 for measuring the magnetic flux density of a permanent magnet and an H coil 5 used for measuring the magnetic field strength of the permanent magnet are wound around the outer periphery of the B coil 4 via an insulating sheet 11. A cylindrical ceramic outer holder 8 having a hollow portion 12 through which the holder 7 is inserted and accommodated and a coil groove 13 is formed in the circumferential direction of the central portion of the outer peripheral portion is provided, and the coil groove 13 of the outer holder 8 is provided. The M coil 6 used for the measurement of the magnetization of the permanent magnet is wound around, the insulating sheet 14 is disposed on the outer periphery of the M coil, and the B coil 4, the H coil 5 and the M coil 6 are wound coaxially with each other. Turn and The B coil 4 and the H coil 5 have the same number of turns, and the B coil 4 and the M coil 6 have the same number of turns and cross-sectional areas so that the magnetic flux density, magnetic field strength, and magnetization of the permanent magnet can be obtained. A magnetic property measuring sensor characterized by measuring.
(2) The magnetic property measuring sensor described in (1) above is mounted on the outer periphery of the central portion of the permanent magnet test piece 2 in the extending direction, and the induced voltage of the B coil 4 of the magnetic property measuring sensor is integrated. The magnetic flux density is measured, the B coil 4 and the M coil 6 are connected in series, the magnetization is measured from a value obtained by integrating the voltage measured over time, and each of the B coil 4 and the H coil 5 is measured with time. A magnetic characteristic measuring method, comprising: measuring a magnetic field intensity from a value obtained by integrating a difference between voltages measured in a step.

そして、本発明では、永久磁石の磁気特性を測定するための磁気特性測定センサーにおいて、永久磁石の磁束密度を測定するためのＢコイルと、永久磁石の磁界強度の測定に用いるＨコイル及び永久磁石の磁化の測定に用いるＭコイルとを、永久磁石の周囲に同軸状に巻回することにより、永久磁石の磁気特性を測定するにあたって永久磁石の磁界強度や磁化の測定誤差を小さくすることができ、永久磁石の磁気特性を従来よりも正確に評価することができる。
And in this invention, in the magnetic characteristic measurement sensor for measuring the magnetic characteristic of a permanent magnet, B coil for measuring the magnetic flux density of a permanent magnet, H coil used for the measurement of the magnetic field strength of a permanent magnet, and a permanent magnet and M coil used to measure the magnetization of, by winding coaxially around the permanent magnet, it is possible to reduce the measurement error of the magnetic field strength or the magnetization of the permanent magnet when measuring the magnetic properties of the permanent magnet The magnetic properties of the permanent magnet can be evaluated more accurately than before.

本発明に係る磁気特性測定センサーを示す正面断面図。1 is a front sectional view showing a magnetic property measuring sensor according to the present invention. 同側面断面図。FIG.

以下に、本発明に係る磁気特性測定センサー及び同センサーを用いた磁気特性測定方法の具体的な構成について図面を参照しながら説明する。   Hereinafter, a specific configuration of a magnetic characteristic measurement sensor and a magnetic characteristic measurement method using the same according to the present invention will be described with reference to the drawings.

図１に示すように、磁気特性測定センサー１は、所定長さの円柱状に形成した永久磁石の試験片２を挿通させたホルダー３にＢコイル４とＨコイル５とＭコイル６とを巻回している。ここで、Ｂコイル４は、試験片２の磁束密度を測定するためのコイルであり、Ｈコイル５は、Ｂコイル４とともに用いて試験片２の磁界強度を測定するためのコイルであり、Ｍコイル６は、Ｂコイル４とともに用いて試験片２の磁化を測定するためのコイルである。   As shown in FIG. 1, the magnetic characteristic measuring sensor 1 has a B coil 4, an H coil 5, and an M coil 6 wound around a holder 3 through which a test piece 2 of a permanent magnet formed in a cylindrical shape having a predetermined length is inserted. It is turning. Here, the B coil 4 is a coil for measuring the magnetic flux density of the test piece 2, and the H coil 5 is a coil for measuring the magnetic field strength of the test piece 2 together with the B coil 4. The coil 6 is a coil for use with the B coil 4 to measure the magnetization of the test piece 2.

ホルダー３は、試験片２を挿通させた円筒状の内側ホルダー７と、内側ホルダー７の外周に装着した円筒状の外側ホルダー８とで構成している。   The holder 3 includes a cylindrical inner holder 7 through which the test piece 2 is inserted, and a cylindrical outer holder 8 attached to the outer periphery of the inner holder 7.

内側ホルダー７は、試験片２を挿通させるために試験片２の径の寸法公差を考慮した内径の中空部９を形成するとともに、外周部にコイル溝10を円周方向に向けて形成している。コイル溝10には、Ｂコイル４を巻回するとともに、Ｂコイル４の外周部にＨコイル５を絶縁シート11を介して巻回している。これにより、Ｈコイル５は、試験片２の周囲において試験片２に対してＢコイル４と同軸状、かつ、同心円上に配置されている。また、Ｈコイル５は、巻数がＢコイル４と同一となるようにしている。
The inner holder 7 is formed with a hollow portion 9 having an inner diameter in consideration of the dimensional tolerance of the diameter of the test piece 2 in order to allow the test piece 2 to be inserted, and a coil groove 10 is formed on the outer peripheral portion in the circumferential direction. Yes. A B coil 4 is wound around the coil groove 10, and an H coil 5 is wound around the outer periphery of the B coil 4 via an insulating sheet 11. Thus, the H coil 5 is arranged coaxially with the B coil 4 and concentrically with respect to the test piece 2 around the test piece 2. Further, the H coil 5 has the same number of turns as the B coil 4.

外側ホルダー８は、内側ホルダー７を挿通させるために中空部12を形成するとともに、外周部にコイル溝13を円周方向に向けて形成している。コイル溝13には、Ｍコイル６を巻回するとともに、Ｍコイル６の外周部に絶縁シート14を被覆している。Ｍコイル６は、巻数と断面積との積がＢコイル４と同一となるようにしている。この外側ホルダー８は、コイル溝13を内側ホルダー７のコイル溝10の外周部に位置させており、これにより、Ｍコイル６は、試験片２の周囲において試験片２に対してＢコイル４及びＨコイル５と同軸状、かつ、同心円上に配置されている。
The outer holder 8 is formed with a hollow portion 12 so that the inner holder 7 can be inserted therethrough, and a coil groove 13 is formed on the outer peripheral portion in the circumferential direction. An M coil 6 is wound around the coil groove 13, and an outer periphery of the M coil 6 is covered with an insulating sheet 14. The M coil 6 is configured such that the product of the number of turns and the cross-sectional area is the same as that of the B coil 4. In the outer holder 8, the coil groove 13 is positioned on the outer peripheral portion of the coil groove 10 of the inner holder 7, so that the M coil 6 has the B coil 4 and the B coil 4 and the test piece 2 around the test piece 2. It is coaxial with the H coil 5 and is arranged on a concentric circle.

上記磁気特性測定センサー１では、試験片２と各コイル4,5,6とを近接させて配置するとともに、各コイル4,5,6やホルダー３の熱等による変形を防止することで、測定精度をより一層向上させることができる。そのため、上記磁気特性測定センサー１では、ホルダー３（内側ホルダー７、外側ホルダー８）を薄くても強度を確保でき耐熱性に優れたセラミック材で形成し、また、薄くて耐熱性を有する絶縁シート11を介してＢコイル４にＨコイル５を巻回している。   In the magnetic property measuring sensor 1, the test piece 2 and the coils 4, 5, 6 are arranged close to each other, and the coils 4, 5, 6 and the holder 3 are prevented from being deformed by heat, etc. The accuracy can be further improved. Therefore, in the magnetic property measuring sensor 1, the insulating sheet is made of a ceramic material that can ensure strength even when the holder 3 (inner holder 7 and outer holder 8) is thin and has excellent heat resistance, and is thin and has heat resistance. The H coil 5 is wound around the B coil 4 via 11.

磁気特性測定センサー１は、以上に説明したように構成しており、この磁気特性測定センサー１を用いて試験片２の磁気特性を測定することができる。   The magnetic characteristic measurement sensor 1 is configured as described above, and the magnetic characteristic of the test piece 2 can be measured using the magnetic characteristic measurement sensor 1.

磁気特性を測定するには、試験片２の伸延方向の略中央部に磁気特性測定センサー１を装着するとともに、日本工業規格で定められた「永久磁石試験方法」と同様に測定対象と試験片２と電磁石とで閉磁気回路を構成し、試験片２の磁束密度や磁化や磁界強度を測定する。   In order to measure the magnetic properties, the magnetic property measuring sensor 1 is attached to the substantially central portion of the test piece 2 in the extending direction, and the measurement object and the test piece are similar to the “permanent magnet test method” defined by the Japanese Industrial Standards. 2 and an electromagnet constitute a closed magnetic circuit, and the magnetic flux density, magnetization, and magnetic field strength of the test piece 2 are measured.

磁束密度を測定する場合には、試験片２の周囲に巻回したＢコイル４の誘導電圧を積分することで測定できる。   When measuring the magnetic flux density, it can be measured by integrating the induced voltage of the B coil 4 wound around the test piece 2.

磁化を測定する場合には、試験片２の周囲に同軸状に巻回したＢコイル４とＭコイル６とを用い、以下に説明するように、Ｍコイル６を空隙補償コイルとして利用することで測定できる。
When measuring magnetization with a B coil 4 wound coaxially and M coil 6 around the test piece 2, as described below, by using the M coil 6 as a void compensation coil It can be measured.

まず、それぞれのＢコイル４とＭコイル６とで得られる磁束密度ＢB、ＢMは、磁界強度をＨ、磁化をＭ、透磁率をμ0とすると、式１で示される。

Figure 0005576840
First, the magnetic flux densities B B and B M obtained by each of the B coil 4 and the M coil 6 are expressed by Equation 1, where the magnetic field strength is H, the magnetization is M, and the magnetic permeability is μ 0 .
Figure 0005576840

この式１を、Ｂコイル４とＭコイル６とで得られる磁束φB、φMで表すと、Ｂコイル４とＭコイル６と試験片２の断面積をそれぞれＳB、ＳM、ＳSとすると、式２に変形できる。

Figure 0005576840
When Expression 1 is expressed by magnetic fluxes φ B and φ M obtained by the B coil 4 and the M coil 6, the cross-sectional areas of the B coil 4, the M coil 6 and the test piece 2 are respectively represented by S B , S M and S S. Then, it can be transformed into Equation 2.
Figure 0005576840

そして、Ｂコイル４とＭコイル６とを直列接続したときに計測される電圧ｅBMは、Ｂコイル４とＭコイル６の巻数をそれぞれＮB、ＮMとすると、式３で示される。この式３に上記式２を代入して展開すると、電圧ｅBMは、式４に変形できる。

Figure 0005576840
The voltage e BM measured when the B coil 4 and the M coil 6 are connected in series is expressed by Equation 3 when the number of turns of the B coil 4 and the M coil 6 is N B and N M , respectively. When the above expression 2 is substituted into the expression 3 and developed, the voltage e BM can be transformed into the expression 4.
Figure 0005576840

ここで、Ｂコイル４とＭコイル６は、巻数と断面積との積が同一（ＮBＳB＝ＮMＳM）であることから、式４は、式５と表せる。

Figure 0005576840
Here, since the product of the number of turns and the cross-sectional area of the B coil 4 and the M coil 6 is the same (N B S B = N M S M ), the expression 4 can be expressed as the expression 5.
Figure 0005576840

したがって、磁化は、式５を積分して変形することで式６を用いて求めることができ、Ｂコイル４とＭコイル６とを直列接続したときに経時的に計測される電圧ｅBMを積分回路で積分した値から測定することができる。

Figure 0005576840
Therefore, the magnetization can be obtained by using Equation 6 by integrating and transforming Equation 5, and integrating the voltage e BM measured over time when the B coil 4 and the M coil 6 are connected in series. It can be measured from the value integrated by the circuit.
Figure 0005576840

ここで、磁化は、試験片２に巻回していない空隙補償コイルをＢコイル４に互いに電気的に打ち消し合うように接続したときに計測される電圧ｅから式７を用いて測定することもできる。

Figure 0005576840
Here, the magnetization can also be measured by using Equation 7 from the voltage e measured when the air gap compensation coils that are not wound around the test piece 2 are connected to the B coil 4 so as to electrically cancel each other. .
Figure 0005576840

しかしながら、直径10mm、長さ20mmの純度99.99％のニッケル、コバルト、鉄からなる試験片２について実際に測定し、理論値との相対的な誤差を算出したところ、式６を用いた場合には、各試験片２について1.3％、2.74％、1.52％であったのに対して、式７を用いた場合には、各試験片２について16.1％、17.2％、14.7％となった。   However, when actual measurement was performed on a test piece 2 made of nickel, cobalt, and iron with a diameter of 10 mm and a length of 20 mm and a purity of 99.99%, the relative error from the theoretical value was calculated. In contrast, the values of 1.3%, 2.74%, and 1.52% for each test piece 2 were 16.1%, 17.2%, and 14.7% for each test piece 2 when Equation 7 was used.

このことから、上記磁気特性測定センサー１のように試験片２の周囲に同軸状に巻回したＢコイル４とＭコイル６とを用いて測定することにより、測定誤差を小さくできることが示された。
Therefore, by measuring by using the above-mentioned magnetic property measurement B coil 4 and M coil 6 wound coaxially around the specimen 2 as in the sensor 1, it was shown that the measurement error can be reduced .

また、試験片２の端部近傍では反磁界の影響を大きく受けるために、測定誤差が大きくなるおそれがある。そこで、直径10mm、純度99.99％の長さ4mm、10mm、20mm、30mmの試験片２について伸延方向の中央部に磁気特性測定センサー１を装着して実際に測定し、理論値との相対的な誤差を算出したところ、各試験片２について26.7％、7.6％、1.1％、0.9％となった。   Further, the measurement error may be increased because the demagnetizing field is greatly influenced near the end of the test piece 2. Therefore, a test piece 2 having a diameter of 10 mm and a purity of 99.99% and a length of 4 mm, 10 mm, 20 mm, and 30 mm was actually measured by mounting the magnetic property measuring sensor 1 at the center in the distraction direction, and the relative value to the theoretical value. When the error was calculated, it was 26.7%, 7.6%, 1.1%, and 0.9% for each test piece 2.

このことから、上記磁気特性測定センサー１を試験片２に装着する場合には、反磁界の影響が無くなるように試験片２の端部から磁気特性測定センサー１をなるべく離して装着する必要があり、長さ20mm以上の試験片２の伸延方向の中央部に装着することが望ましい。   For this reason, when the magnetic property measuring sensor 1 is attached to the test piece 2, it is necessary to attach the magnetic property measuring sensor 1 as far as possible from the end of the test piece 2 so as to eliminate the influence of the demagnetizing field. It is desirable to attach the test piece 2 having a length of 20 mm or more to the central portion in the extending direction.

以上のようにして磁化を精度良く測定することができるため、上記磁束密度と磁化とを用いて式８に示される関係式から磁界強度を算出することができる。

Figure 0005576840
Since the magnetization can be accurately measured as described above, the magnetic field strength can be calculated from the relational expression shown in Expression 8 using the magnetic flux density and the magnetization.
Figure 0005576840

また、磁界強度は、試験片２の周囲に同軸状に巻回したＢコイル４とＨコイル５とを用い、以下に説明するように、Ｈコイル５を空隙補償コイルとして利用することで測定することもできる。
The magnetic field strength is measured by using the B coil 4 and the H coil 5 coaxially wound around the test piece 2 and using the H coil 5 as a gap compensation coil as will be described below. You can also.

まず、それぞれのＢコイル４とＨコイル５とで得られる磁束密度ＢB、ＢHは、磁界強度をＨ、磁化をＭ、透磁率をμ0とすると、式９で示される。

Figure 0005576840
First, the magnetic flux densities B B and B H obtained by the respective B coils 4 and H coils 5 are expressed by Equation 9 where the magnetic field strength is H, the magnetization is M, and the magnetic permeability is μ 0 .
Figure 0005576840

この式９を、Ｂコイル４とＨコイル５とで得られる磁束ΦB、ΦHで表すと、Ｂコイル４とＨコイル５と試験片２の断面積をそれぞれＳB、ＳH、ＳSとし、Ｂコイル４とＨコイル５の巻数をそれぞれＮB、ＮHとすると、式１０に変形できる。

Figure 0005576840
When Expression 9 is expressed by magnetic fluxes Φ B and Φ H obtained by the B coil 4 and the H coil 5, the cross-sectional areas of the B coil 4, the H coil 5 and the test piece 2 are respectively represented by S B , S H and S S. Assuming that the numbers of turns of the B coil 4 and the H coil 5 are N B and N H , respectively, the equation 10 can be obtained.
Figure 0005576840

そして、Ｈコイル５とＢコイル４とでそれぞれ計測される電圧ｅH、ｅBの差は、式１１で示される。この式１１に上記式１０を代入して展開すると、電圧ｅH、ｅBの差は、式１２に変形できる。

Figure 0005576840
The difference between the voltages e H and e B measured by the H coil 5 and the B coil 4 is expressed by Expression 11. When the above equation 10 is substituted into the equation 11 and developed, the difference between the voltages e H and e B can be transformed into the equation 12.
Figure 0005576840

ここで、Ｂコイル４とＨコイル５は、巻数が同一（ＮB＝ＮH）であることから、式１２は、式１３と表せる。

Figure 0005576840
Here, since the B coil 4 and the H coil 5 have the same number of turns (N B = N H ), Expression 12 can be expressed as Expression 13.
Figure 0005576840

したがって、磁界強度は、式１３を積分して変形することで式１４を用いて求めることができ、Ｈコイル５とＢコイル４とでそれぞれ経時的に計測される電圧ｅH、ｅBの差を積分回路で積分した値から測定することができる。

Figure 0005576840
Therefore, the magnetic field strength can be obtained by using Equation 14 by integrating and transforming Equation 13, and the difference between voltages e H and e B measured with time in H coil 5 and B coil 4 respectively. Can be measured from the value integrated by the integration circuit.
Figure 0005576840

以上に説明したように、本発明では、試験片２の磁気特性を測定する磁気特性測定センサー１において、磁束密度を測定するためのＢコイル４と、Ｂコイル４とともに用いて磁界強度を測定するためのＨコイル５と、Ｂコイル４とともに用いて磁化を測定するためのＭコイル６とを、試験片２の周囲に同軸状に巻回している。 As described above, in the present invention, in the magnetic property measuring sensor 1 for measuring the magnetic property of the test piece 2, the magnetic field strength is measured using the B coil 4 for measuring the magnetic flux density and the B coil 4. and H coils 5 for, and M coil 6 for measuring the magnetization used with B coil 4 is wound coaxially around the specimen 2.

そのため、本発明では、試験片２の磁気特性を測定するにあたって磁界強度や磁化の測定誤差を小さくすることができ、試験片２の磁気特性を従来よりも正確に評価することができる。   For this reason, in the present invention, when measuring the magnetic characteristics of the test piece 2, the measurement error of the magnetic field strength and the magnetization can be reduced, and the magnetic characteristics of the test piece 2 can be evaluated more accurately than before.

特に、本発明では、Ｈコイル５又はＭコイル６とＢコイル４とを試験片２の周囲に同軸上、かつ、同心円上に配置することで、磁気特性測定センサー１及び同センサー１を用いた測定システムの小型化を図ることもできる。   In particular, in the present invention, the magnetic property measuring sensor 1 and the sensor 1 are used by arranging the H coil 5 or the M coil 6 and the B coil 4 coaxially and concentrically around the test piece 2. It is also possible to reduce the size of the measurement system.

また、本発明では、Ｈコイル５の巻数をＢコイル４の巻数と同一とし、或いは、Ｍコイル６の断面積と巻数との積をＢコイル４の断面積と巻数との積と同一とすることで、経時的に計測される電圧を積分回路で積分することで磁界強度や磁化を容易に測定することができる。   In the present invention, the number of turns of the H coil 5 is the same as the number of turns of the B coil 4, or the product of the sectional area and the number of turns of the M coil 6 is the same as the product of the sectional area and the number of turns of the B coil 4. Thus, the magnetic field strength and the magnetization can be easily measured by integrating the voltage measured over time with the integration circuit.

１ 磁気特性測定センサー ２ 試験片
３ ホルダー ４ Ｂコイル
５ Ｈコイル ６ Ｍコイル
７ 内側ホルダー ８ 外側ホルダー
９ 中空部 10 コイル溝
11 絶縁シート 12 中空部
13 コイル溝 14 絶縁シート DESCRIPTION OF SYMBOLS 1 Magnetic characteristic measurement sensor 2 Test piece 3 Holder 4 B coil 5 H coil 6 M coil 7 Inner holder 8 Outer holder 9 Hollow part 10 Coil groove
11 Insulation sheet 12 Hollow part
13 Coil groove 14 Insulation sheet

Claims (2)

永久磁石の外周に装着して磁気特性を測定するための磁気特性測定センサーにおいて、
永久磁石の試験片(２)を挿通させる中空部(９)を形成し外周部の中央部の円周方向にコイル溝(１０)を形成した円筒状でセラミック製の内側ホルダー(７)を備え、前記内側ホルダー(７)のコイル溝(１０)に、永久磁石の磁束密度を測定するためのＢコイル(４)と、前記Ｂコイル(４)の外周に絶縁シート(１１)を介して永久磁石の磁界強度の測定に用いるＨコイル(５)とを巻回し、前記内側ホルダー(７)を挿通して収容する中空部(１２)を形成し外周部の中央部の円周方向にコイル溝(１３)を形成した円筒状でセラミック製の外側ホルダー(８)を備え、前記外側ホルダー(８)のコイル溝(１３)に永久磁石の磁化の測定に用いるＭコイルを巻回し、前記Ｍコイル(６)の外周に絶縁シート(１４)を配置し、前記Ｂコイル(４)と前記Ｈコイル(５)と前記Ｍコイル(６)とは互いに同軸状に巻回し且つ前記Ｂコイル(４)と前記Ｈコイル(５)は巻数を同一にすると共に、前記Ｂコイル(４)と前記Ｍコイル(６)を直列に接続し且つ巻数及び断面積との積を同一にして、永久磁石の磁束密度と磁界強度と磁化とを測定することを特徴とする磁気特性測定センサー。 In a magnetic property measurement sensor that is attached to the outer periphery of a permanent magnet to measure magnetic properties,
A cylindrical ceramic inner holder (7) having a hollow portion (9) through which a permanent magnet test piece (2) is inserted and a coil groove (10) formed in the circumferential direction at the center of the outer peripheral portion is provided. The coil groove (10) of the inner holder (7) has a B coil (4) for measuring the magnetic flux density of a permanent magnet, and the outer periphery of the B coil (4) is permanently attached via an insulating sheet (11). An H coil (5) used for measuring the magnetic field strength of the magnet is wound to form a hollow portion (12) that is inserted through the inner holder (7) and accommodated, and a coil groove is formed in the circumferential direction at the center of the outer peripheral portion. A cylindrical ceramic outer holder (8) formed with (13) is provided, and an M coil used for measuring the magnetization of a permanent magnet is wound around the coil groove (13) of the outer holder (8). An insulating sheet (14) is arranged on the outer periphery of (6), and the B coil (4), the H coil (5), and the M coil (6) And the B coil (4) and the H coil (5) have the same number of turns, and the B coil (4) and the M coil (6) are connected in series and the number of turns and A magnetic property measurement sensor characterized by measuring the magnetic flux density, magnetic field strength, and magnetization of a permanent magnet with the same cross-sectional area product . 請求項１に記載の磁気特性測定センサーを永久磁石の試験片２の伸延方向の中央部の外周に装着し、前記磁気特性測定センサーの前記Ｂコイル(４)の誘導電圧を積分して磁束密度を測定し、前記Ｂコイル(４)と前記Ｍコイル(６)を直列に接続し経時的に測定した電圧を積分した値から磁化を測定し、前記Ｂコイル(４)と前記Ｈコイル(５)の各々で経時的に測定した電圧の差を積分した値から磁界強度を測定することを特徴とする磁気特性測定方法。A magnetic property measuring sensor according to claim 1 is mounted on the outer periphery of the central portion in the extending direction of the test piece 2 of a permanent magnet, and the induced voltage of the B coil (4) of the magnetic property measuring sensor is integrated to obtain a magnetic flux density. The B coil (4) and the M coil (6) are connected in series, the magnetization is measured from the value obtained by integrating the voltage measured over time, and the B coil (4) and the H coil (5) are measured. The magnetic field strength is measured from a value obtained by integrating the voltage difference measured over time in each of the above.
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