SU1531043A1 - Device for measuring magnetic characteristics of ferromagnetic materials - Google Patents

Abstract

The invention relates to magnetic measurements. The aim of the invention is to improve the accuracy of measurements. The device contains a symmetrical magnetic circuit 1 with measuring 2 and compensation 3 branches C-shaped with a common central core 4, magnetizing windings 5 and 6, measuring windings 7.8, compensation windings 9.10, potential-pole coils 11.12, gauge 13 magnetic field strengths, magnetic induction meter 14, automatic compensation unit 15, power amplifier 16, comparison unit 17, jumper 18. 1 Il.

Description

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The invention relates to magnetic measurements and is intended to measure the magnetic characteristics of ferromagnetic materials as well as their products.

The purpose of the invention is to increase the measurement measurement.

The drawing shows a block diagram of the device.

The device contains a symmetrical magnetic core-1 with measuring 2 and compensating 3 branches of the C-shaped form with a common central rod k, magnetizing windings 5 and 6, measuring windings 7 and 8, compensation windings 9 and 10, potential-pole coils 11 and 12, meter. 13 magnetic field strengths, And magnetic induction meter, automatic compensation unit 15, power amplifier 1b, comparison unit 17, jumper 18.

The device works as follows.

Since the magnetic system is symmetric and the magnetic resistances of branches 2 and 3 are equal in the absence of the test sample 19, when current flows through the magnetizing windings 5 and 6, the magnetic flux in the rod is absent due to the magnetic fluxes in the branches x 2 and 3. After the test sample is placed into the gap of the measuring branch 2, the equality of the magnetic resistances of the branches 2 and 3 is violated and in branch 2 an additional magnetic flux created by the test sample 19 appears. This magnetic flux mainly closes along the rod k and t m greater the greater magnetic resistance branch 3. This means that the magnetic flux F through the rod will be a function of the magnetization and thickness I of the test sample 1, i.e. f (i, l). Induced in the first measuring winding 7, the EMF is applied to the input of the automatic compensation unit 15.

The automatic compensation unit 15 allows the output to receive an amplitude-adjustable signal that is identical in shape to the input signal. The unit delivers current in the presence of the test piece 19 in the air gap of the measuring branch 2 and turns off when it is removed. Adjustment of the compensation current coming from block 15

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The compensation windings 9 and 10 are produced by the output resultant signal from the comparison block 17, to the inputs of which signals from the power amplifier 16 and the second measuring winding 8 are supplied. When the resultant signal from the comparison block 17 is equal to zero, the amplitude of the compensation current stops.

The compensation current supplied from the automatic compensation unit 15 to the compensation windings 9 and 10 creates an additional magnetic flux that compensates for the fall of the magnetic potential in the rod 4 and at the junction points between sample 19 and the magnetic conductor 1. In this case, the magnetic flux ceases to depend on the thickness of the subject sample and recorded by magnetic induction meter 1.

A magnetic field strength meter 13 connected to potential-pole coils 11 and 12 records the magnetic field strength value in sample 19.

Claims (1)

Invention Formula A device for measuring the magnetic characteristics of ferromagnetic materials, containing a magnetic core with two magnetizing windings connected in series, the first measuring winding, the first terminal of which is connected to the input of a magnetic induction meter, and the second terminal is connected to a common bus, the second measuring winding, the first terminal of which is connected with the first input of the comparison unit, and the second output is connected to the common bus, the first and second potential-pole coils, placed at the corresponding poles of the ma pnitoprovods, the first terminals of which are connected to the inputs of a magnetic field strength meter, the first and second compensation windings connected in series, connected to a common bus, a power amplifier, characterized in that, in order to improve the measurement accuracy, it is equipped with an automatic compensation unit, and a jumper, the magnetic circuit is made symmetrical in the form of C-shaped measuring and compensation branches with a common central rod, the first and second magnetizing windings are arranged accordingly ng  15310 3 measuring and compensating branch of the magnetic circuit, we will take the first pin of the magnetic circuit, the first e-waters of the first measuring winding The first and the first compensation module is connected to the first input of the automatic winding unit; they are placed on the central rod-automatic compensation; the second input no magnetic conductor, the second meter is connected to the output of the unit on the coil is located on one of the comparison, the second input of which is through the poles of the compensation branch of the magnesium power amplifier is connected to the output ground, the second compensation block of automatic compensation and the winding is placed on the measuring Q by the first output of the first compensating branch of the magnetic circuit and is made from the winding, potentially pole two sections, each of which snab-coils are connected in series, additional conclusions, the jumper is fixed with the possibility A potential-pole coil size by means of its complement on the lateral surface of the corresponding-15 output sections of the second compensating pole of the measuring wind-oWet.