JPH04102462U - Iron loss value measuring device - Google Patents

Abstract

(57) [Summary] [Purpose] To enable accurate measurement depending on material and tension online in the production line. [Structure] Magnetic flux density of the material to be measured 1 measured by the detection coil 4, thickness and width of the material to be measured measured by the thickness gage 20 and width gage 21, tension measured by the tension meter 22, and material of the material to be measured 1 at the time of the tension. The iron loss is calculated by inputting the correction value corresponding to the iron loss calculation circuit 11 into the iron loss calculation circuit 11.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention aims to reduce iron loss in ferromagnetic materials, especially in electrical steel sheets where the quality of magnetic properties is an issue. This relates to an iron loss value measuring device that performs online measurements during construction.

0002

[Conventional technology]

For ferromagnetic materials such as steel sheets, especially electrical steel sheets, the quality of magnetic properties such as iron loss is a major factor in quality. Measuring iron loss is important for quality control and operational management as it affects quality. .

0003 An example of a device that can analyze iron loss online is the one disclosed in Japanese Patent Application Laid-open No. 49-6961. A device has been proposed. This device is a rectangular cylinder with flanges at both ends as shown in Figure 6. A magnetic flux density coil is installed on the outside of the iron core 31 so as to have the same axis as shown in FIG. 33 is wound, and an air gap compensation coil 35 and a magnetic field coil are attached to the outer side of the coil 33 in order from the inside. An excitation coil 34 is provided on the outside so as to be coaxial with the iron core 31. 32 is wound around the detection section 30.

0004 However, in the case of this device, the exciting coil 32 is connected to the other coils 33, 3. Due to the presence of 4 and 35, they are separated from steel plate 1, as shown by the broken line in Fig. 7. The vertical component of the magnetic force lines generated from the excitation coil 32 to the surface of the steel plate 1 becomes smaller, It is difficult for magnetic lines of force to enter the steel plate 1. For this reason, the detection unit 30 operates at a constant rate as shown in FIG. In order to obtain the required length l, which corresponds to the strength of the magnetic field of the bell, the length of the excitation coil is set to a long dimension. Also, it was necessary to increase the output of the excitation power supply.

[0005] Iron loss is the power loss value per unit weight, and when measuring it, Due to the necessity of dimensional measurement, measurements of thickness, width, etc. are required. For example, for a steel plate with a constant width, the thickness The thickness gage 36 (see FIG. 7) used for this measurement is connected to the detection unit 3. Due to the mechanism of the 0, it cannot be installed in the same location as the It was difficult to measure at certain points. To solve this problem, measure the same location on the steel plate. It would be better to synchronize the timing of steel plate thickness measurement and power loss measurement so that In that case, there was a problem that the device would be complicated.

[0006] Therefore, in order to solve these problems, the applicant of the present application first proposed. This is an iron loss measuring device disclosed in Japanese Utility Model Application Publication No. 61-206883. this is , two through-type excitation coils are used, and each magnetic field component from these is one closed magnetic circuit. A detection coil is arranged between the detection coils and a detection coil A measuring device to measure dimensions related to the cross-sectional area of steel plates, etc. will be installed near the Therefore, the output of the excitation power source can be reduced, and the relationship between power loss and cross-sectional area can be reduced. An object of the present invention is to provide an iron loss measuring device that can measure iron loss accurately by measuring approximately the same location. The porpose is to do.

[0007] This iron loss measuring device is capable of measuring the movement of a long material to be measured that is moving in the longitudinal direction. Two pieces are installed so that the material to be measured passes through them at different positions in the direction of movement within the area. An excitation coil is placed between the excitation coils and detects changes in magnetic flux density of the material to be measured. A detection coil that is installed near the detection coil and has dimensions related to the cross-sectional area of the material to be measured. The present invention is characterized by comprising a measuring device for non-magnetically measuring the magnetic field.

[0008]

[Problem that the idea aims to solve]

It is mandatory for the above-mentioned electrical steel sheets to display the iron loss through the Epstein test at the time of shipment. This Epstein test is conducted under no tension, but during operation When measuring iron loss, generally tension is always applied to the electrical steel sheet. by the way, As shown in Figure 4, iron loss depends on the tension of the steel plate and its material, and varies depending on the grade. It has characteristics of A to D depending on the characteristics.

[0009] Therefore, for the same material to be measured, the iron loss measured during operation and the Epstein There is a problem that the iron loss obtained by the iron test is different from the iron loss. Additionally, the Epstein test Because the measurement is carried out by cutting the product, it is not possible to measure the entire length, and it is not possible to measure the entire length. There was a problem in that it could not be reflected in operations due to reasons such as inability to measure.

0010 In view of the above-mentioned problems, this invention uses the same setup as the Epstein test for tension during operation. By correcting the iron loss measurement value so that the (equivalent to the iron loss during the Epstein test) without being affected by tension. Iron loss measurement equipment that can measure iron loss continuously and in real time during operation. It was made for the purpose of providing.

[0011]

[Means to solve the problem]

In order to solve the above problems, the iron loss value measuring device of the present invention moves in the longitudinal direction. The long material to be measured penetrates at different positions in the moving direction of the long material to be measured. Two excitation coils are arranged so that the a detection coil for detecting changes in magnetic flux density; A measuring device that non-magnetically measures dimensions related to the cross-sectional area of a constant material, and a device near the above-mentioned detection coil. A tension meter installed at Iron loss calculation circuit that calculates iron loss by correcting the tension according to the tension and the material of the material to be measured. It is equipped with the following.

0012

[Effect]

With the above-described configuration, the present invention uses the detection coil to detect the magnetic flux density of the material to be measured and The thickness and width of the material to be measured using the tension meter, and the tension measured by the tension meter and at the time of the tension. The iron loss value of the material to be measured is determined by the correction value according to the material of the material to be measured. Accurate measurement depends on the corresponding tension.

[0013]

【Example】

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, in which 1 is a manufacturing line. A magnetic steel sheet is being transported in the longitudinal direction (in the direction of the arrow) over a steel plate (not shown). .

[0014] An appropriate length in the transfer direction of the transfer area of this electromagnetic steel plate (hereinafter simply referred to as "steel plate") 1 Excitation coils with an inner diameter larger than the cross-sectional dimension in the width direction of the steel plate 1 are located at two separated positions. 2 and 3 are provided so that the steel plate 1 passes through them, and the excitation coils 2 and 3 respectively Both ends are 50Hz or 60Hz, which is specified as the frequency for iron loss measurement in JIS. It is connected in series to the current power source 5. Note that excitation coils 2 and 3 may be connected in parallel. stomach.

[0015] The separation distance between the excitation coils 2 and 3 is determined as shown in FIG. The lines of magnetic force H from each of 2 and 3 are set so as to form a closed magnetic path with one loop. As a result, when the steel plate 1 passes through the excitation coils 2 and 3, it is lengthened by the excitation coils 2 and 3. AC magnetization is performed in the hand direction, and a constant magnetic flux is created between the excitation coils 2 and 3 as shown in Figure 3. A stable magnetic flux density region E having a density greater than or equal to the required length is formed.

[0016] In addition, the detection coil is wound with a steel plate 1, for example, at the center position between the excitation coils 2 and 3. A detection coil 4 is provided with a 50Hz detection coil based on the frequency of the AC power source 5. Or a fundamental wave of 60Hz and a harmonic of about 150Hz caused by waveform distortion due to iron loss of steel plate 1, etc. wave (n x fundamental wave, n = 2, 3, 4...) and the magnetic domain wall inside steel plate 1 during the steel plate magnetization process. High frequencies (several KHz to Detects a signal containing three components including Barkhausen noise (several 100 KHz). In addition, The detection coil 4 is provided with a magnetic path length correction coil (not shown). For example, if the magnetic field distribution changes depending on the transfer speed or material of the steel plate 1, the Determine the effective magnetic path length using the calibration curve between the desired magnetic path length correction coil output and effective magnetic path length. It is now possible to do so.

[0017] The detection signal of the detection coil 4 is then applied to an attenuator 6 and a current control circuit 7. It will be done. The current control circuit 7 controls the output of the AC power supply 5 based on the detected input signal. The voltage is adjusted to adjust the strength of the magnetic field generated from the excitation coils 2 and 3. On the other hand, decrease A low-pass filter 8 is connected to the output side of the attenuator 6, and the input from the detection coil 4 is The attenuation rate is set so that the power signal level does not exceed the maximum allowable input voltage of low-pass filter 8. is determined.

[0018] The low-pass filter 8 has a cutoff frequency of, for example, 100Hz to remove the third harmonic. ing. The output signal of the low-pass filter 8 is amplified by the amplifier 9, and the output signal of the power meter 10 is Applied to the voltage terminal. Excitation current is supplied to the wattmeter 10 from the AC power supply 5. It has become so. Therefore, the detection coil 4, the low-pass filter 8, the wattmeter 10 and AC power supply 5 have the same configuration as the Epstein test equipment, and are equipped with a power meter. 10 detects power loss from the excitation current signal and the voltage signal from the amplifier 9; The output value is given to the iron loss calculation circuit 11.

[0019] A position near the detection coil 4 between the excitation coil 2 and the detection coil 4 and the excitation coil Excitation coils 2 and 2 are located between the coil 3 and the detection coil 4, respectively, at positions near the detection coil. without being affected by magnetic field lines from 3 and without affecting the detection signal of detection coil 4. For example, a thickness gauge 20 and a width gauge 21 using gamma rays, which can be detected without any detection, are placed facing the steel plate 1. Furthermore, a tension meter is installed near the excitation coil 3 to measure the tension in the steel plate 1. 22 are provided. Then, the respective values from the thickness gauge 20, width gauge 21 and tension gauge 22 are The detection signal is input to the iron loss calculation circuit 11 together with the output signal of the wattmeter 10. The iron loss is calculated by this iron loss calculation circuit 11.

[0020] First, the iron loss calculation circuit 11 calculates the iron loss W per unit weight (1 kg). Regarding the mass of the steel plate 1 length l portion corresponding to the power loss detection section (effective magnetic path length) Equation 1 below for determining power loss P is set.

[0021]

[Math 1] W=P/ρ・t・w・l (W/kg) However, ρ: density of steel plate t: Thickness of steel plate w: Width of steel plate

[0022] Therefore, t and w from the thickness gauge 20 and width gauge 21, and P from the wattmeter 10. Based on the input, the iron loss W is calculated based on Equation 1 above. Next, the iron loss calculation circuit 11 calculates the iron loss W calculated based on the above formula 1. Then, tension correction is performed according to the tension of the steel plate 1 measured by the tension meter 22. vinegar In other words, if the tension-corrected iron loss is W' and the measured tension is Ten, then W' is It is determined by Equation 2 below.

[0023]

[Math 2] W'=W(1-α/Ten) However, α: Tension correction coefficient by material

[0024] Then, record the iron loss W' (W/kg) obtained by this formula 2 on the recorder 16. It is something that can be done. Here, the coefficient α depends on the set magnetic flux density of the steel plate 1 and its material. They are different. In addition, the iron loss value based on the tension corresponding to each material is As shown in Figure 4 above, the influence can be determined by setting the characteristics A to D in advance and The properties of the steel plate 1 to be measured are set in advance from A to D, and the properties of the steel plate 1 to be measured are set to any of A to D. This can be corrected by selecting depending on the material. It is.

[0025] As described above, while transporting the steel plate 1 on the production line (that is, online ), the iron loss value is continuously measured in real time, and the value is recorded on the recorder 16. It is something that can be done. Moreover, the iron loss value depends on the tension of the steel plate 1, and Since the tension is corrected according to the material of plate 1 and is measured and recorded with high accuracy, This recorded iron loss value can also be used as the iron loss value by Epstein test at the time of shipment. Wear. This can be explained using the correlation diagram shown in Figure 5. The diagram shows the iron loss corrected for tension. The results of comparing the measured values with the Epstein test values are shown, and the measured iron loss values at each measurement position are It is close to the Epstein value, indicating that it was measured with high accuracy.

[0026]

[Effect of the idea]

As explained above, the iron loss value measuring device of the present invention detects the measured material using the detection coil. The magnetic flux density, the thickness and width of the material to be measured by the measuring device, and the tension and its width by the tensiometer. The iron of the material to be measured is determined by the correction value according to the material of the material to be measured at the time of tension This is a method to measure the loss value, and is performed online in the production line depending on the material and tension. It is possible to measure with high accuracy. Therefore, the iron loss required when shipping electrical steel sheets is Not only can values be measured with high precision during the manufacturing process, but the measurement results can also be viewed in real time. This can be reflected in the manufacturing conditions in time, and can improve the product yield rate. It is a very effective iron loss value measuring device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the iron loss value measuring device of the present invention.

FIG. 2 is an explanatory diagram of routes of excitation magnetic lines of force in the device.

FIG. 3 is an explanatory diagram showing the magnetization state of a steel plate by the excitation coil.

FIG. 4 is a characteristic diagram showing the influence of tension on iron loss value.

FIG. 5 is a relationship diagram showing the effect of tension correction.

FIG. 6 is a perspective view of an iron core of a detection unit in a conventional example.

FIG. 7 is a sectional view of the coil in a wound state.

FIG. 8 is a characteristic diagram of the same magnetic field state.

[Explanation of symbols]

1 Electrical steel sheet 2, 3 Excitation coil 4 Detection coil 11 Iron loss calculation circuit 20 Thickness gauge 21 Width meter 22 Tension meter

Claims (1)

[Scope of utility model registration request] 1. Two excitation coils provided so that the material to be measured penetrates at different positions in the movement direction of a long material to be measured, which is moving in the longitudinal direction, and a space between the excitation coils. a detection coil that is disposed in the area to detect changes in magnetic flux density of the material to be measured; a measuring device that is provided near the detection coil to non-magnetically measure dimensions related to the cross-sectional area of the material to be measured; and the detection coil. A tension meter that is installed nearby and measures the tension of the material to be measured, and an iron loss calculation circuit that calculates iron loss by correcting the tension according to the tension measured by the tension meter and the material of the material to be measured. An iron loss value measuring device comprising: