KR100270107B1 - Electric iron plate continuation iron-loss measuring apparatus - Google Patents

Abstract

PURPOSE: An apparatus for measuring continuous iron wires is provided to directly measure on-line iron wires of an electrical steel plate using the principle of a transformer. CONSTITUTION: An apparatus for measuring continuous iron wires includes an iron wire measuring sensor(11) consisting of the first excitation coil for generating a given magnetic flux to an electrical steel plate and the second sensing coil for detecting a thermal loss upon generation of a magnetic flux of the electrical steel plate. A power supply(13) applies a given current to the first excitation coil of the iron wire measuring sensor(11) based on a control of a microcomputer(14). A wattmeter(12) outputs a current value by the voltage value applied to the second sensing coil of the iron wire measuring sensor(11) and a current value applied to the first excitation coil. The microcomputer(14) applies a loss signal to a data writer(15) using a compensation value for the iron value detected from the iron wire measuring sensor(11) and the power value from the wattmeter(12) and also calculates the iron value using data representing the loss signal from the data writer(15). The data writer(15) outputs the loss signal from the microcomputer(14) as digital data of a given format. An encoder(16) applies a given coding signal to the microcomputer(14). A chart writer(17) displays the calculation result from the microcomputer(14) on a chart writing paper. A monitor(18) displays the output value from the microcomputer(14) on a screen. A printer(19) prints the result from the microcomputer(14) on a given paper.

Description

Electrical steel sheet continuous iron loss measuring device

FIG. 1 is a block diagram showing a configuration of a continuous iron loss measuring apparatus according to an embodiment of the present invention.

2b is a perspective view showing the detailed configuration of the sensor shown in Fig. 1; Fig.

2c is a plan view of the sensor shown in FIG.

FIG. 3a is a block diagram for explaining the Em Stein test method.

3b is an equivalent circuit diagram of Fig. 3a, and Fig. 3c is an equivalent circuit diagram of Fig. 3a.

DESCRIPTION OF THE REFERENCE NUMERALS

11: Iron loss measuring sensor 12:

13: power supply 14: microcomputer

15: Data writer 16: Encoder

17: chart recorder 18: monitor

19: Printer

TECHNICAL FIELD The present invention relates to an apparatus for measuring continuous iron loss of an electric steel sheet, and more particularly, to an apparatus for measuring continuous iron loss on an electric steel sheet, which can be installed on a production line directly on site to measure iron loss of an electric steel sheet on-

The iron loss refers to the electric energy lost in the steel when the steel sheet is magnetized in alternating current, and is expressed as loss energy per unit mass (W / Kg). In the KS and JIS standards, The test method is fixed.

However, when the iron loss is measured off-line, it is difficult to measure the iron loss on the electric steel sheet overall length. Therefore, the above-mentioned E-Stein measuring method is an off-line measuring method. TOP TAIL) and the value measured by the off-line MSTEIN method must be applied to the entire steel sheet.

An object of the present invention is to provide an apparatus for measuring continuous iron loss on an electric steel sheet, which can directly measure iron loss of an electric steel sheet on-line from a production line in the field using the principle of a transformer have.

As a technical means for achieving the above object, the present invention provides an apparatus for continuously measuring iron loss in an electric steel sheet,

An iron loss sensing means composed of a primary excitation coil for holding a predetermined magnetic flux on an electric steel plate and a conductor for winding a secondary sensing coil for detecting the magnetic flux of the electric steel plate,

Current applying means for applying a predetermined current to the primary excitation coil of the iron loss sensing means in accordance with a control signal from the control means,

Power measuring means for measuring a power value for outputting a power value based on a current output from the current applying means and a voltage applied to a secondary sensing coil of the iron loss sensing means;

And outputs the core loss signal to the data writing means, receives the loss data output from the data writing means, and outputs the loss data from the data writing means. A control means for calculating an iron loss value,

Data writing means for representing the loss signal input from said control means in a predetermined form of digital data;

And output means for outputting the iron loss value calculated by the control means.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a configuration of an apparatus for measuring iron loss of an electric steel sheet according to an embodiment of the present invention. The apparatus includes a primary excitation coil for generating a magnetic flux on an electric steel plate, A power supply 13 for applying a predetermined current to the primary excitation coil of the iron loss measuring sensor 11 by a control signal from the microcomputer 14, A power meter 12 for outputting a power value based on a voltage value applied to the secondary sensing coil of the iron loss measurement sensor 11 and a current value applied to the primary excitation coil; And receives a power value from the power meter 12 to apply a loss signal to the data writer 15 and again receives data indicating the loss signal from the data writer 15 Do not calculate the iron loss value. A data writer 15 for outputting a loss signal input from the microcomputer 14 in a predetermined format as digital data and an encoder 15 for applying a predetermined encoding signal to the microcomputer 14, A chart recorder 17 for displaying a calculation result output from the microcomputer 14 on a chart recording sheet, a monitor 18 for displaying an output value from the microcomputer 14 on the screen, And a printer 19 for printing the result output from the microcomputer 14 on a predetermined paper.

Fig. 2 (a) is a partial structural view of an iron loss detection sensor showing a primary excitation coil wound around the entire outer surface of a conductor tube having a length of 50 mm inside, a width of 1500 mm and a length of 970 mm. And FIG. 2C is a plan view of an iron loss detection sensor in which the first excitation coil and the second sensing coil are wound together. FIG. 2C is a partial plan view of the iron loss detection sensor showing a secondary sensing coil wound around a portion of the outer surface of the conductor tube .

The operation and effect of the present invention will be described in detail.

First, the principle of the present invention will be described as follows.

In the overall schematic of the Emstein test machine shown in FIG. 3a, a test piece passing through the primary coil and the secondary coil is stacked in a rectangular shape as shown in the figure, and the current flowing in the primary coil, that is, the magnetizing coil and the secondary coil, The induced voltage is measured to calculate the power loss due to iron loss. If the magnetic flux flowing through the specimen is ø, the voltage E induced on the secondary coil is as follows.

(Where E: effective value voltage (V) of the detection coil)

n: Second coil winding

f: excitation frequency (Hz)

t: steel plate thickness (m)

w: steel plate width (m)

B: magnetic flux density (T)

Therefore, the magnetic flux density (B) is expressed by the following equation.

The iron loss should be determined when the maximum value of magnetic flux density is 1.7T for directional electrical steel and 1.5T for non-oriented electrical steel. When this condition is satisfied, the iron loss is obtained from the output of the power meter according to the following equation.

(Where W _L : iron loss [W / kg]

P: Power [W]

E: Effective voltage of detection coil [V]

E1: average value voltage of detection coil [V]

R: Composite resistance of voltmeter and power meter [Ω]

h: Hysteresis loss ratio

e: eddy current loss ratio

m: mass of sample [kg]

In Figure 3a, the inputs of the power system are the primary side current and the secondary side voltage. In other words, M. Stein testing machine, by default, when by using a voltage converter to view the 3b degree equivalent circuit, R _1, X _1, and R _2, X ₂ is the first and a second resistance and the reactance of the secondary coil, respectively, g _0, b ₀ is a woman (勵磁) will display the impedance when in the form of an admittance, the Figure 3b in the I ₀ is woman (勵磁) current, I _u is the core loss current, I _m is the magnetizing current, I ₁ 1 I ₂ represents a secondary current.

In the above, the iron loss of the sample, whereas inde E _i I _o, the output of the meter is shown with the product of the cosine of the phase difference between V ₂ I ₁ and V _2, I _1. Since the internal impedance of the voltmeter is very large, I _i = I ₀ -I ₂ in FIG. 3b, and due to the phase relationship shown in FIG.

Here, E ₁ I ₀ is the power lost at the excitation resistance g ₀ , E ₂ I ₂ is the loss due to the power system internal resistance R, and the output value of the power system is the loss due to the iron loss, Is equal to the sum of losses due to the internal resistance of the power system, and thus the output value of the power system is clearly shown as follows.

According to the above-described principle, the present invention calculates a power value according to a voltage detected from a secondary sensing coil and a current applied to a primary excitation coil, and calculates an iron loss value from the calculated power value. The operation by this will be described with reference to FIGS. 1 and 2.

First, the operation of the iron loss measurement sensor shown in FIG. 2 will be described. In this embodiment, an electric steel sheet to be measured for iron loss is inserted therein, a predetermined current is applied to the primary excitation coil, The iron loss value is measured.

The object to be measured with the iron loss is inserted into the iron loss measuring sensor 11 as shown in FIG. 2, and an operation control signal is applied to the power supply 13, A current of a predetermined value is applied to the primary excitation coil of the iron loss measuring sensor 11 so that a magnetic flux is generated in the electric steel sheet inserted into the iron loss measuring sensor 11 and a voltage V2 is applied to the secondary sensing coil, . And the current value applied to the primary excitation coil is input to the power meter 12. The power meter 12 detects the current value of the input primary excitation coil and the voltage value of the secondary sensing coil And outputs the calculated power value to the microcomputer 14. The microcomputer 14 corrects the error due to the environmental condition or the condition conversion and inputs the loss signal due to the power value input from the power meter 13 to the data writer 15. [ The data writer 15 converts the inputted core loss into data of a predetermined format and outputs the data to the microcomputer 14 so that the microcomputer 14 reads the data inputted from the data writer 15 The iron loss value of the electric steel sheet inserted into the iron loss measurement sensor 11 is calculated. The calculation of the iron loss value is performed by the above-described equation (3), and the calculation result is outputted to each of the output devices, for example, the chart recorder 17, the monitor 18 and the printer 19 , So that the user can see it.

Thus, the present invention is characterized in measuring the iron loss of an electric steel sheet without a magnetic closed loop, and it is possible to measure continuous iron loss with respect to the electric field of the electric steel sheet, and to obtain the distribution of iron loss on the steel sheet overall length , And there is also an excellent effect that can be applied directly to production lines in the field.

Claims (2)

An iron steel loss continuous measurement apparatus for an iron steel plate, comprising: iron loss sensing means comprising a primary excitation coil for holding a predetermined magnetic flux on an electric steel plate and a conductor for winding a secondary sensing coil for detecting the magnetic flux of the electric steel plate; A current applying means for applying a predetermined current to the primary excitation coil of the iron loss sensing means in accordance with a control signal from the current application means and a voltage applied to the secondary sensing coil of the iron loss sensing means And outputs the core loss signal to the data writing means. The data writing means is configured to output the core loss signal to the data writing means, Control means for receiving loss data output from the writing means and calculating an iron loss value from the data; Data writing means for representing the loss signal inputted from the control means in the form of digital data in a predetermined format and output means for outputting the iron loss value calculated by the control means. The iron loss measuring apparatus according to claim 1, wherein the iron loss measuring sensor is formed by winding the primary excitation coil over the entire surface of the conductor tube and winding the secondary winding coil over a central portion of the conductor tube. Device.