JP4402921B2 - Magnetic measuring device - Google Patents

Description

The present invention, magnetic properties of the magnetic material, and more particularly relates to a preferred magnetic measurements equipment for measuring the two-dimensional magnetic properties.

  One way to reduce the loss and increase the efficiency of electrical equipment is to reduce iron loss in the core of electrical equipment. One approach is to accurately grasp the magnetic properties of magnetic materials and what A structural improvement of whether to use in shape is conceivable.

  In terms of accurately grasping the magnetic properties of magnetic materials, it has been a one-dimensional measurement by unidirectional excitation so far, so it is difficult to say that the properties have been accurately grasped. That is, the axial characteristic measurement method such as the single plate test method and the Epstein test method is a one-dimensional measurement by one-way excitation, and ignores the relationship between the magnetic flux density B and the magnetic field strength H, which should be a vector quantity, and the measurement direction ( The amount of mapping in the direction of the easy axis of magnetization was only measured as a scalar value.

  However, when a magnetic field is applied to an anisotropic magnetic material with an inclination with respect to the easy axis direction, or under a rotating magnetic field, a difference in direction occurs between the magnetic flux density and the magnetic field strength vector. In order to accurately grasp this magnetic characteristic, an attempt to directly measure the relationship between the two as a vector quantity has recently made it possible to measure the magnetic characteristic in a magnetic material under various magnetic flux conditions such as alternating and rotating. A two-dimensional magnetic measuring device has been proposed. The magnetic properties obtained by this measurement method are called two-dimensional magnetic properties, and the magnetic field strength and magnetic flux density of the entire sample can be grasped as vector quantities, and are positioned as absolute evaluation methods for materials.

  With reference to FIG. 8, the outline | summary of the two-dimensional magnetic measuring apparatus proposed now is demonstrated. As shown in FIG. 8 (a), a pair of exciting yokes 101x opposite to each other in the x direction and a pair of exciting yokes 101y opposite to each other in the y direction are arranged and fixed, and each of the exciting yokes 101x, 101y is arranged. Are magnetically coupled by the yoke 102. An exciting coil 103 is wound around each of the exciting yokes 101x and 101y.

  A sample 104 is placed at a position surrounded by the excitation yokes 101x and 101y. In order to concentrate the magnetic flux in the sample 104, as shown in FIG. 8 (b), the both end portions of the excitation yokes 101x and 101y are processed to be inclined at 45 degrees. In order to make the magnetic flux in the sample 104 uniform, an air gap 105 is formed between the sample 104 and each of the exciting yokes 101x and 101y.

  A hole is formed in the central region of the sample 104, and a B coil 106 is provided in which formal wires are wound in each direction so as to be orthogonal to the sample several turns depending on the sample. Further, above the sample 104, a H coil 107 is used in which a formal wire is used for bakelite, and an Hx coil is wound orthogonally on the Hy coil.

As shown in FIG. 9, an alternating magnetic flux and a rotating magnetic flux are defined. In the alternating magnetic flux, the maximum magnetic flux density B _max and the tilt angle φ from the easy axis, and in the rotating magnetic flux, the axial ratio α (short axis / long axis), the maximum magnetic flux density B _max, and the long axis tilt from the easy axis. Expressed by the angle φ.

Masato Gion: “Two-dimensional magnetic properties”, Electrical Engineering, Vol. 115, No. 1, (1995)

  However, when a magnetic material is processed and used in an electrical device or the like, stress is applied by cutting, caulking, or installation in the manufacturing process, and the magnetic characteristics of the magnetic material change due to the influence of residual stress or distortion. Therefore, a technique for measuring two-dimensional magnetic characteristics in consideration of stress is required.

  The present invention has been made in view of the above points, and an object of the present invention is to enable measurement of two-dimensional magnetic characteristics in consideration of stress on various magnetic materials.

It is a feature of the magnetic measuring device of the present invention is a magnetic measuring device as the magnetic flux penetrates into the sample from a direction which is arbitrarily selected among the x and y directions, to measure the magnetic properties of the sample In addition, an external force applying means capable of applying a desired external force to the sample is provided, the long plate-shaped sample is arranged and fixed in the x direction, and opposite to each other in the y direction on both sides of the sample. A pair of exciting yokes is arranged and fixed, and an exciting coil is wound around both ends of the sample and each exciting yoke. Further, the external force applying means is for applying an arbitrary tensile load or compressive load to one or both ends in the longitudinal direction of the sample. Furthermore, the external force applying means is to apply a load uniformly to the entire end face of the sample.

Another feature of the magnetic measurement apparatus of the present invention is that the magnetic measurement apparatus measures the magnetic properties of the sample by allowing magnetic flux to penetrate into the sample from any direction selected from the x and y directions. And an external force applying means capable of applying a desired external force to the sample, a pair of exciting yokes opposite to each other in the x direction across the sample, and a y direction across the sample. A pair of exciting yokes opposite to each other are arranged and fixed, and an exciting coil is wound around each of the exciting yokes. Further, both ends in the x direction or y direction of the sample are bent substantially vertically downward or substantially vertically upward, and the external force applying means applies an arbitrary tensile load to the bent ends or one end. In that point.

  According to the present invention, since a desired external force can be applied to the sample, it is possible to measure two-dimensional magnetic characteristics in consideration of stress, and various magnetic materials change due to the effects of residual stress and strain. It becomes possible to evaluate the magnetic characteristics.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a magnetic measuring device according to the invention will be described with reference to the drawings.
(First embodiment)
With reference to FIGS. 1-6, the magnetic measuring apparatus of 1st Embodiment is demonstrated. A long plate-shaped sample 1 is arranged and fixed in the x direction, and a pair of exciting yokes 2 opposite to each other in the y direction are arranged and fixed on both sides of the sample 1. An excitation coil 3 is wound around the yoke 2. The sample 1 is manufactured, for example, as shown in FIG. 5 by cutting out from the specimen 10, and the inclination angle θ _B σ from the easy magnetization axis is one of the parameters.

  The sample 1 and the exciting yoke 2 are magnetically coupled by the yoke 4. In order to concentrate the magnetic flux in the sample 1, both sides of the tip of the excitation yoke 2 are processed to be inclined by 45 degrees, and in order to make the magnetic flux in the sample 1 uniform, the sample 1 and the excitation yoke are processed. As described above, an air gap is formed between the two.

  Although not specifically shown, a hole is formed in the central region of the sample 1, and a B coil is provided in which a formal wire is wound in each direction so as to be orthogonal to the sample several turns depending on the sample. In addition, an H coil 5 in which a formal wire is used for an acrylic or quartz plate and a Hx coil is wound orthogonally on the Hy coil is disposed above the sample 1 (see FIG. 4).

  Here, as shown in FIG. 3A, an external force applying means 6 that can selectively apply an arbitrary tensile load and compressive load to the sample 1 is provided at one end in the longitudinal direction of the sample 1. It is done. The specific configuration of the external force applying means 6 is not limited, but the load is applied uniformly to the entire end surface of the sample 1. Further, in the illustrated example, the external force applying means 6 exists only on one end side of the sample 1, but may exist on both end sides. The sample 1 may be laminated as shown in FIG. 2 or may be a single plate that can reduce the applied force.

  In addition, as shown in FIG. 3B, a triaxial strain gauge 7 is disposed on the sample 1. As shown in the figure, the triaxial strain gauge 7 is composed of first to third strain gauges 7a to 7c arranged at a phase of 60 degrees so as to go to the center of the sample 1, and the first first strain gauge in the center. Are arranged along the short direction of the sample 1. The stress σ measured by the triaxial strain gauge 7 is set as one of the parameters.

  As the measurement system, as shown in FIG. 6, using the magnetic measurement device and the control device 50 described so far, waveform control, waveform processing, calculation of magnetic flux density B and magnetic field strength H are performed by software programming.

In general, magnetic characteristics are measured under sinusoidal magnetic flux conditions. That is, the applied magnetic field is controlled so that an arbitrary magnetic flux density becomes a sine wave at the output. Thereby, the relationship between the magnetic flux density B and the magnetic field strength H is uniquely determined. In the measurement method, parameters (magnetic flux density B _max , tilt angle φ, axial ratio α, frequency, etc.) for creating an arbitrary magnetic flux density condition are first input, and the difference between the set waveform and the induced magnetic flux voltage waveform is added to the excitation waveform. This is repeated until the waveform control is completed. After the waveform control is completed, the magnetic flux density B and the magnetic field strength H are measured. One cycle is divided into 512 to approximate the waveform.

Further, the magnetic flux density B and the magnetic field strength H that change with time in the data logger 51 are set as parameters (stress σ and inclination angle θ _B σ from the easy axis of magnetization, magnetic flux density B _max , inclination angle φ, axial ratio). (α, frequency, etc.).

  According to the magnetic measuring apparatus of the first embodiment described above, the magnetic force can be measured while applying an arbitrary tensile load and compressive load to the sample 1 by the external force applying means 6, It is possible to measure the considered two-dimensional magnetic characteristics, and it is possible to evaluate the magnetic characteristics that change due to the effects of residual stress and strain for various magnetic materials.

(Second Embodiment)
With reference to FIG. 7, the magnetic measurement apparatus of 2nd Embodiment is demonstrated. A pair of exciting yokes 11x opposite to each other in the x direction and a pair of exciting yokes 11y opposite to each other in the y direction are arranged and fixed, and each of the exciting yokes 11x and 11y are magnetically coupled by a yoke (not shown). . An exciting coil 13 is wound around each exciting yoke 11x, 11y.

  A sample 14 is placed at a position surrounded by the excitation yokes 11x and 11y. In order to concentrate the magnetic flux in the sample 14, both ends of the excitation yokes 11x and 11y are processed to be inclined by 45 degrees, and in order to make the magnetic flux in the sample 14 uniform, the sample 14 and the excitation yoke 11x are excited. As described above, an air gap is formed between the yokes 11x and 11y.

  Although not specifically shown, a hole is formed in the central region of the sample 14, and a B coil is provided in which a formal wire is wound in each direction so as to be orthogonal to the sample several turns depending on the sample. Further, above the sample 14, an H coil 15 is used in which a formal wire is used for bakelite, and an Hx coil is wound orthogonally on the Hy coil (see FIG. 4).

  Here, as shown in FIG. 7 (b), both ends of the sample 14 (both ends in the x direction in the illustrated example) are bent so as to hang downward substantially vertically, Thus, an external force applying means 16 capable of applying an arbitrary tensile load is provided. A support member 17 is provided to support the sample 14 so as not to move when a tensile load is applied. Note that both ends of the sample 14 may be bent substantially vertically upward, and the external force applying means 16 may exist only on one end side of the sample 14.

  Further, as described in the first embodiment, the triaxial strain gauge 7 is disposed on the sample 14. As shown in FIG. 3, the triaxial strain gauge 7 is configured by first to third strain gauges 7 a to 7 c arranged so as to be shifted to the center of the sample 1 by 60 degrees, and the first first strain gauge in the center. Are arranged along the short direction of the sample 1. The stress σ measured by the triaxial strain gauge 7 is set as one of the parameters.

  According to the magnetic measurement apparatus of the second embodiment described above, the magnetic force can be measured while applying an arbitrary tensile load to the sample 1 by the external force applying means 16, so that the stress is taken into consideration. Dimensional magnetic characteristics can be measured, and various magnetic materials can be evaluated for magnetic characteristics that change due to the effects of residual stress and strain.

  It should be noted that the shapes and structures of the respective parts shown in the above embodiments are merely examples of implementation in carrying out the present invention, and these limit the technical scope of the present invention. It should not be interpreted. That is, the present invention can be implemented in various forms without departing from the spirit or main features thereof.

It is a top view which shows the outline | summary of the magnetic measuring apparatus of 1st Embodiment. It is a perspective view which shows the outline | summary of the magnetic measuring apparatus of 1st Embodiment. It is a side view which shows the outline | summary of the magnetic measuring apparatus of 1st Embodiment, and a figure which shows a triaxial strain gauge. It is a perspective view which shows H coil. It is a figure for demonstrating manufacture of a sample. It is a figure for demonstrating the structure around the control apparatus. It is the perspective view and side view which show the outline | summary of the magnetic measuring apparatus of 2nd Embodiment. It is a figure explaining the outline | summary of the conventional two-dimensional magnetic measuring apparatus. It is a figure for demonstrating an alternating magnetic flux and a rotation magnetic flux.

Explanation of symbols

1, 14 Sample 2, 11x, 11y Excitation yoke 3, 13 Excitation coil 4 Yoke 5, 15 H coil 6, 16 External force applying means 7 Triaxial strain gauge

Claims (5)

A magnetic measurement apparatus for measuring magnetic properties of a sample by allowing magnetic flux to penetrate into the sample from a direction arbitrarily selected from the x direction and the y direction,
Comprising an external force applying means capable of applying a desired external force to the sample;
A long plate-shaped sample is arranged and fixed in the x direction, and a pair of exciting yokes opposite to each other in the y direction are arranged and fixed on both sides of the sample, and both ends of the sample and the exciting yokes are arranged. magnetic measuring device characterized in that the excitation coil is wound around the. 2. The magnetic measurement apparatus according to claim 1 , wherein the external force applying means applies an arbitrary tensile load or compressive load to one end or both ends in the longitudinal direction of the sample. The magnetic measurement apparatus according to claim 2 , wherein the external force applying unit applies a load uniformly to the entire end surface of the sample. A magnetic measurement apparatus for measuring magnetic properties of a sample by allowing magnetic flux to penetrate into the sample from a direction arbitrarily selected from the x direction and the y direction,
Comprising an external force applying means capable of applying a desired external force to the sample;
A pair of exciting yokes that are opposite to each other in the x direction across the sample and a pair of exciting yokes that are opposite to each other in the y direction across the sample are arranged and fixed, and each exciting yoke has an exciting coil. magnetic measuring device shall be the characterized in that the wound. Both ends in the x direction or y direction of the sample are bent substantially vertically downward or substantially vertically upward, and the external force applying means applies an arbitrary tensile load to the bent ends or one end. The magnetic measurement apparatus according to claim 4 .

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