SU270876A1 - DEVICE FOR OBTAINING A VARIABLE MAGNETIC FIELD OF A GIVEN VOLTAGE - Google Patents

Description

The invention relates to measures of non-temporary magnetic field, intended for reconstructing its knowledge, calibration, innovations and research on the magnitude of a non-magnetic magnetic field under the conditions of scientific research: verification or industrial laboratory.

The device for reconstructing the idimensional magnetic zero, which is not air, does not contain aerial (not contained; not ferromagnetic materials) coils (Helm-holtz rings, Maxwell-Rubens coils, etc.), through which alternating current flows.

The accuracy of such measures cannot be accurate in measuring the magnitude of the alternating current intaled by the coil. Instruments for measuring the magnitude of the alternating current have an accuracy of 0.1 g 0.5% in the sonic and 1 in the subsonic frequency range. Such accuracy in the strength of the wellness field is insufficient.

Also known are devices that can serve to reproduce a constant magic field, made in the form of variometers. Such devices consist of two katuiles inserted one into another, one of the coils (internally) having the ability to rotate around a fixed axis. If the coil is wired, the coil has a constant current, then the inside will receive a vras, an alternating magnetic field, the intensity of which will be determined by the value of the supply current of the constant coil, and the angular frequency will be the rotation speed of the coil. The accuracy of the rotating magnitude of a rotating non-temporary magnetic field with a device is 2 to 3 times higher than the accuracy of the above-described devices for reproduced magnetic field strength due to the fact that the measurement error of the value of the angular current that winds the coil will be reduced. However, a similar device does not solve the task of reproducing stresses of an uninterrupted magnetic zero by completeness, since it can retard only a rotating magnetic field.

In order to improve the reproducibility of the reproducibility of a temporary magnetic field and the possibility of varying the laws of its change, both air coils of the proposed device, having different diameters and inserted one into another, are mounted on a common axis and equipped with a jog drive, for example, counter-rotation of coils. devices with equal angular velocity. The coils of the device have equal constant but intensity, are connected by a sequence and flow around the common constant gok from the stabilized current. The OAiia of the cogwheel differential gears is connected externally to the coil of the nasredswheel of the iol shaft, the other - with the internal and atvihikha of a smaller diameter shaft passing along the axis of the hollow shaft.

FIG. 1 given the mechanical system, a sca-scheme of the proposed device for the reproduction and an array of temporary magnetic zero; in fig. 2-terminal electrical circuit of the device; in fig. 3rd vector diagram.

On a common non-displaceable base / there is a gear differential consisting of a drive shaft 2, a pinion gear 3 m of two driven gears 4 and 5, and a coil device for reproducing the magnetic field of magnetic zero; The inner 6 is outer 7. The inner coil 6 is connected to the bristles 4 by means of the shaft 8, and the outer coil 7 is connected by means of a nil shaft 9 to the gear 5. The gears 5, 4 n 5 have the same diameters and number of teeth. A device made in this way has one degree of freedom; when the rotation of the input shaft 2 at an angle of f its Bnu1renn and external coils make an angular rotation of the corners, respectively, cpi and ф2, respectively, nrich.m

F1

A schematic diagram of the electrical connections of the device for reproducing the voltage, explaining how the total DC current flows through the counter-rotating coils, is shown in FIG. 2. BHVTrenna the coil 6 through the contact rings 10. 11, and the sliding contacts 12, 13 is connected to a stabilized source of static current 14. The external coil 7 of the device for transferring the ion through the contact rings 15, 16 and the sliding contacts 17 18 also connects to a current source. In this way, the coils of the device are connected in series without violating their rotation. Both coils of the device have different waveforms, t, e, with a flow of equal (in this case, total) current through them, each of the coils creates a constant magnetic field of equal strength;

HI // a - // o.

The direction of the intensity vectors is perpendicular to the plane of each of the rollers and, therefore, depends only on their angle of rotation φ.

Considering that // 1 Я2 Яо and ф,

From the above ratio, the out-bottom, 1 anravlennaya vector of tension in space is constant, and its value is determined by the angle of rotation of the input shaft of the device.

The proposed device works as follows. From the external drive (Fig. 1), the shaft of the device 2 enters, rotating uniformly (). Due to the use of the differential with an equal number of teeth of the drive 3 n driven 4 and 5 gears, the coils of the device 6 and 7 through the shafts 8 and 9 also receive a uniform rotation, but in mutually opposite directions (coi - -c). The serial connection of coils 6 and 7 is not disturbed during rotation due to the use of co-tact rings 10, 11 and U5, 16 and sliding contacts / 2, 13 and 17, 18 (Fig. 2). With uniform and counter-rotation of the coils, the device's floor dimension will be harmonize;

I am a cos ((o / + f).

Where I am

total vector nair femininity

25 floor in the center of the cutter devices ; Yao - magnetic field strength,

created by each pz coaters; (O - angular velocity; 0t - time;

f - the initial phase.

For nauchepi uniform zero in a large volume of the proposed device. Can

be composed of coils of complex configuration (Helmholtz rings, coils

Maxwell, Rubens Coil),

Obtaining other laws from the change of time consistency can be achieved by choosing the appropriate law to change the speed of rotation of the drive shaft.

Thus, the proposed device for reproducing the intensity of a non-reliant magnetic naught, due to the fact that a direct current is used for its supply, 5 the measurement accuracy of which is 100-g1000 times higher than the current, allows to increase the accuracy of reproduction of the magnitude of the ac magnetic magni fi 10 grams 100 times. 0

Subject invention

A device for producing an alternating magnetic field of predetermined intensity,

5 contains two air coils located one inside the other, mounted on one axis of a mechanical drive common to them, as well as a source of direct current, characterized in that, in order to increase gears, one of which is connected to the outer coil by means of a new shaft, and the friend is connected to the inner katugiko by a shaft of smaller diameter passing along

The oci of the hollow shaft, while the coils and connected to the nostochnnku of a constant current are successively, and their nostochny but nanrnosheng are chosen equal.

15 1b

/ MS

amounts

2-but