JPH0624789Y2 - Continuous iron loss measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement of an iron loss measuring device that measures the iron loss of a continuously running iron plate in real time online.

<Prior Art> An example of the prior art will be described with reference to FIG. 1 is arrow A
The iron plates 2 and 3 that continuously run in the direction are the exciting coil means and the secondary coil means that are arranged opposite to each other with the iron plate sandwiched therebetween, and an alternating exciting current I is supplied to the exciting coil.

Reference numeral 4 is an AC reference voltage source, and 5 is a voltage dividing means for dividing the reference voltage _es by the control signal e _c and supplying the set value e _i to the current generating means 6. The current generating means 6 supplies an exciting current I to the exciting coil 2 such that the set value e _i and the set value e _f of the secondary coil 3 become equal.

Reference numeral 7 is a thickness sensor using radiation means, and the measured value PV _t is guided to the thickness deviation calculation means 8 and the nominal thickness t _o.
And the plate thickness deviation ± Δt is calculated and transmitted to the plate thickness calculating means 9. Thickness calculating means 9, nominal thickness t _o the thickness deviation ±
A plate thickness signal t is transmitted by Δt by calculating t = t _o ± Δt.

Block 10 of the chain line is a excitation control means, within the control unit, 101 is a first arithmetic function having the characteristics of 1 / t _o, by entering the measured values e _f of the secondary coil means e _f
/ T _o supplying operation output to the second calculation function 102 along with sending to iron loss calculation means described below.

Here, the measurement value _{e f} of the secondary coil unit 3, a constant K,
The frequency of the excitation current f, and the magnetic flux density B, and the thickness of the iron plate when t, the width is b, a _{e f = K · f · B} · t · b.

The second calculation function 102 receives the magnetic flux density setting signal B and outputs 1
Since it has the characteristic of / B, its operation output is K · f · B ·
b · t _o / t, which is transmitted to the third arithmetic function 103.

The third calculation function 103 inputs the plate thickness signal t, the nominal plate thickness setting value t _o , and the plate width setting signal b from the plate thickness calculating means 9 to input t.
Since it has a characteristic of _o / bt, its operation output becomes Kf, the deviation from the set value E _s is input to the integrating amplifier 104, and its output e _c is supplied to the voltage dividing means 5.

By such an excitation control means, the magnetic flux density of the iron plate to be measured is controlled to the set value B.

The chain line block 11 is an iron loss calculation means. In the iron loss calculation means 11, the signal related to the exciting current I is input to the calculation function 111. The calculation function 111 inputs the current range signal CT for power calculation and has a characteristic of 1 / CT, so the calculation output is I / CT, and this signal is input to the first multiplication function 112 that executes power calculation. .

The first multiplication function 112 is the calculation function 101 of the excitation control means.
Input e _f / t _o of the output of
The second multiplication function 113 outputs a power signal W _{/ t} o · CT
Call.

Reference numeral 12 is a calculating means, which inputs the plate thickness deviation signal ± Δt, the nominal plate thickness set value t _o , and the plate width set value b, and calculates the output of t _o / b · t by the second multiplication of the iron loss calculating device. Call function 113. Therefore, the multiplication output of the second multiplication function 113 is W / b
• t · CT, and this output is transmitted to the arithmetic function 114.

The calculation function 114 inputs the current range set value CT and the density set value D of the iron plate to be measured, and has the characteristic of CT / D.
The calculated output is W / b · t · D, which is the power value per unit volume of the iron plate 1, that is, the measured value of iron loss.

Reference numeral 13 is a recording / displaying means of the iron loss measurement value, and 15 is a speed sensor of a traveling iron plate. The measured value PV _s is guided to the recording / displaying means 14 to synchronize the recording paper feed speed with the traveling speed.

<Problems to be Solved by the Invention> In such a configuration, since the position of the measuring coil means and the position of the sensor 7 for measuring the plate thickness are apart, the thickness deviation calculating means 8 has a thickness It incorporates a dead time element that electrically delays the signal by a fixed time τ according to the traveling speed of the iron plate, and the process of matching the timing of coil measurement with the timing of plate thickness measurement is executed.

However, if there is a change in the traveling speed of the iron plate to be measured, when the value of the dead time element is a fixed value, the timing of measurement in the coil means and the timing of plate thickness measurement do not exactly match, Since the accuracy of weight calculation is reduced, there is a problem that the measurement accuracy of iron loss is reduced. .

An object of the present invention is to provide a continuous iron loss measuring device which solves such a problem.

<Means for Solving Problems> The structural feature of the present invention is that the exciting coil means and the secondary coil means, which are arranged so as to face each other with the continuously running iron plate to be measured, and the measured values of the secondary coil means. Means for controlling the exciting current supplied to the exciting coil means so that the magnetic flux density becomes constant, thickness measuring means for continuously measuring the thickness of the iron plate to be measured, and running of the iron plate to be measured. Velocity measuring means for measuring velocity at pulse rate, thickness measuring means, and thickness signal generating means for transmitting a thickness signal synchronized with the pulse rate based on the measurement value of the velocity measuring means, and the thickness signal Data obtained by shifting the output of the generating means,
An iron loss calculating means for continuously calculating the iron loss of the iron plate to be measured based on the signal related to the exciting current and the measured value of the secondary coil means is provided.

<Operation> According to the present invention, the traveling speed of the iron plate to be measured is measured at the pulse rate, and the pulse rate signal is used as the clock pulse signal to transmit the thickness signal synchronized with the pulse rate.
The iron loss of the iron plate to be measured is continuously calculated based on the data obtained by shifting the thickness signal, the signal related to the exciting current, and the measured value of the secondary coil means.

<Embodiment> An embodiment of the present invention will be described with reference to FIG. The same components as those described with reference to FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted.

The speed sensor 14 is realized by a rotary encoder or the like and transmits a measured value PV _s of a pulse rate proportional to the speed. This signal is introduced as a clock pulse signal to the analog-digital conversion function 151 of the synchronization processing means 15, the operation output of the plate thickness deviation operation means 8 is digitally converted in synchronization with the clock pulse, and sent to the memory function 152. Temporarily store a certain number from. The content of this memory is shifted by a predetermined number by the data shift function 153, converted into an analog signal by the digital / analog conversion function 154, and transmitted to the plate thickness calculation means 9 and calculation means 12.

The number of data shifts in the data shift function 153 is
When the distance from the speed sensor 14 to the coil means is Lm and the pulse rate of the measured speed value PV _s is lm / P, if L / l, then the plate thickness deviation signal corresponding to the traveling distance of the iron plate is obtained. It is possible to accurately calculate the iron loss by using. Further, if the pulse-relate measurement value PV _s is appropriately divided or multiplied to set l = 1, a clock pulse can be obtained every 1 m of the unit traveling distance. Therefore, in this case, the number of data shifts should be L. .

<Effect of the Invention> As described above, according to the present invention, it is possible to accurately measure the plate thickness signal of the iron plate at the measurement point of the coil means even when the traveling speed of the measured iron plate varies. The accuracy of the weight calculation is improved, and thus the accuracy of iron loss measurement can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a conventional technique. 1 ... Iron plate to be measured, 2 ... Excitation coil, 3 ... Secondary coil, 4
... reference voltage source, 5 ... voltage dividing means, 6 ... current generating means, 7 ...
Thickness sensor, 8 ... Plate thickness deviation calculation means, 9 ... Plate thickness calculation means, 10 ... Excitation control means, 11 ... Iron loss calculation means, 12 ...
Calculation means, 13 ... Record display means, 14 ... Speed sensor,
Reference numeral 15 ... Synchronous processing means, 151 ... Analog / digital conversion function, 152 ... Memory function, 153 ... Data shift function, 154 ... Digital / analog conversion function

Claims (1)

[Scope of utility model registration request] 1. An exciting coil means and a secondary coil means, which are opposed to each other with a continuously traveling iron plate to be measured sandwiched therebetween, and
Means for controlling the exciting current supplied to the exciting coil means so that the magnetic flux density becomes constant based on the measured value of the next coil means, and thickness measuring means for continuously measuring the thickness of the iron plate to be measured, Speed measuring means for measuring the traveling speed of the iron plate to be measured at a pulse rate, and thickness signal generating means for transmitting a thickness signal synchronized with the pulse rate based on the measured values of the thickness measuring means and the speed measuring means. And an iron loss calculation for continuously calculating the iron loss of the iron plate to be measured based on the data obtained by shifting the output of the thickness signal generating means, the signal related to the exciting current and the measured value of the secondary coil means. And a continuous iron loss measuring device.