SU35923A1 - Device for testing electromagnets, permanent magnets and specimens of magnetic materials - Google Patents

Description

The proposed device refers to the number of devices according to the type of magnetometers, designed to determine the magnetic properties of various materials according to the magnitude of the magnetic field created by the samples during their magnetization; The device is built on the principle of spring balance in such a way that the force of the field is determined by the magnitude of the force that must be applied in order to detach the reference sample from the magnetized specific number of ampervices of the sample under study.

Such devices are known and applied in practice.

A feature of the proposed device is the use of an adjustable air gap between the magnetizing core and the tip of the instrument pointer (arrow) being attracted by it.

In FIG. 1 shows a schematic overview of the device; FIG. 2- its construction.

The main part of the device is a coil-solenoid / (Fig. 1), fed by a direct current, the value of which is regulated by a rheostat 2 and is set by measuring device 3. In the solenoid. The test specimen is placed out of ferromagnetic material.

The solenoid is mounted on a movable rod 4, equipped with a handle to move it around a fixed axis. The arrow 6 with a tip 5 of magnetic material is strengthened on the same axis. In the absence of current in the solenoid, the arrow by the force of the spiral spring is held in the extreme left position corresponding to the zero point of the scale. When testing finished electromagnets, they are fixed instead of a solenoid, for which additional clamps 7 and 8 are provided. The measurement is carried out as follows. When the rod 4 is rotated, the sample magnetized by the solenoid 7 carries the arrow with the iron tip until the value of the counteracting moment of the swirling helical spring 9 does not equal the magnetic force of the sample; then the arrow is detached from the magnet and returns to its original position. The magnitude of the magnetic attraction of the sample under investigation is determined by the magnitude of the angle of rotation of the rod 4, corresponding to the moment when the arrow returns. In order to be able to measure fields of various sizes, it is proposed to provide the solenoid with a movable tip allowing wide adjustment of the magnitude of the air

the gap between the elactromagnet and the iron arrowhead. For this, an endless screw 10 (Fig. 2) is installed, rotated between the posts 7 / by means of the handle 12. The screw 13 moves the nut 13 connected to the iron tip 14. The connecting nut 13 and the iron tip 14 the rod 15 moves when the screw 10 rotates in the longitudinal slit along the rod 4. To determine the magnitude of this movement on the rod, a large-scale ruler 16 with divisions is strengthened. In measurements, as can be seen in the drawing, the distance between the iron tips J4nl5 is first established, and then the coil 7 is pushed to the full contact between the iron core and the M tip, after which measurements are made as described above.

Thus, the division value of the magnetometer scale will depend on the distance between the tips 14 and 15, which is indicated on the auxiliary

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scale 75. The movable jelly tip can be replaced, in some cases, with movable pins from a non-magnetic material, which in the latter case are intended only to establish a certain amount of inter-iron space.

The subject matter of the invention.

A device for testing electromagnets, permanent magnets and specimens of magnetic materials, in which the readings are made by turning an arrow and equipped at the end with pieces of iron and deviating from zero position under the influence of a test magnet or electromagnet, In order to change the size of the gap between the test rod and the end of the arrow, the turntable on which this rod is fastened is equipped with a micrometer screw and a scale to measure the size of the gap.

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