SU1224954A1 - Magnetic modulator - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to increase the sensitivity and accuracy of the conversion. The device contains magnetic cores (MS) 1 and 2, field windings 3, 4, output windings 5, 6, capacitor 7, rod (C) 8 of magnetostrictive material, non-magnetic gasket (NP) 9, control winding 10, bimetallic screen 11, housing 12. Control voltage 10, located at C 8, is supplied with alternating voltage, varying in amplitude. A variable amplitude magnetic field causes the C 8 to be elongated by a different amount. With the 8 ends of both ends, it is rigidly connected to MS 1. Under the effect of elongation, C 8 MS 1 is expanded. The arising variable mechanical stresses lead to a change in the magnetic permeability of MS 1 according to the sin law. As a result, a differential signal appears on the output windings 5 and 6. It is amplified by a resonant circuit from capacitor 7 and the output windings 5 and 6 tuned to the carrier frequency. NP 9 dissolves magnetic circuits MS 1 and C 8 and reduces the damping of elastic waves C 8. A bimetallic screen 11 around C 8 with a control winding 10 reduces the effect on C 8 of the fields from the excitation winding 3 and the output winding 5. 1 Il. (L to th 4 ;; (; about SP 4;

Description

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The invention relates to radio engineering and can be used to generate amplitude-modulated signals in radio engineering devices for various purposes.

The purpose of the invention is to increase the sensitivity and accuracy of the conversion.

The drawing shows a structural electrical circuit of a magnetic modulator.

The magnetic modulator contains the first 1 and second 2 magnetic cores, excitation windings 3 and 4, output windings 5 and 6, capacitor 7, rod 8 of magnetostrictive material, non-magnetic gasket 9, control winding 10, bimetallic screen 11, housing 12.

The magnetic modulator operates as follows.

A variable voltage frequency f, varying in amplitude, is applied to the control winding 10 placed on the rod 8. This. The stress creates a magnetic field of variable amplitude, which accordingly causes the rod 8 of a magnetostrictive material to lengthen by a different size. Since the rod 8 is almost rigidly connected to the magnetic core 1 with both of them, the mechanical sinusoidal oscillations of the rod 8 will be transmitted from both ends to the magnetic core 1. Under the action of the elongation of the rod 8, the magnetic core 1 is stretched. Under the action of a variable tensile force in the magnetic core 1, alternating mechanical tensile stresses arise, which lead to a change in its magnetic permeability according to a sinusoidal law. Due to the change in the magnetic permeability of the magnetic core 1, a difference signal appears on the output windings 5 and 6, which is amplified by resonance

Magnetic modulator, two magnetic materials on each of which are excited and an output rod of material magnetostriction, on which the control rammers, are connected to each other in succession, respectively, 30 windings are connected between the opposite side, and output terminals The first capacitor is made in the form of a ring 35; the end of the rod is made of magnetic material rigidly with the first magnetic card and the same. In order to increase the sensitivity, 40 transforms the accuracy, the magnetostrictive mat is placed inside the first meter of the core, and its other co is connected to the first magician 45 through a nonmagnetic magnet with a rod of mag netic material, on which the control winding is inserted

condenser 7 and the compiler G. Zakharchenko Editor E. Kopcha Tehred N. Bonkalo KorrectorM. Pojo

Order 1962/56

Circulation 816

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35 ,, Raushsk nab. D. 4/5

Production and printing company, Uzhgorod, st. Project, 4

windings 5 and 6. Since the resonant circuit is tuned to the carrier frequency f,, an amplitude-modulated voltage is produced on it,

The non-magnetic gasket 9 divides the magnetic circuits of the magnetic core 1 and the rod 8 from a magnetostrictive material, and the presence of elastic properties close to the magnetic cores reduces the damping of the elastic oscillations of the rod 8. The presence of a bimetallic screen 11 around the rod B with a winding 10 controls reduces the effect the scattering on the rod 8 from the excitation winding 3 and the output winding 5.

Claims (1)

Invention Formula 20 25 Magnetic modulator containing two magnetic cores placed in a housing of a non-magnetic material, each of which contains an excitation winding and an output winding, and a rod of magnetostrictive material on which a control winding is placed, the excitation windings being interconnected in series with each other, output 30 the windings are interconnected in series with each other, and between the other outputs of the output windings a capacitor is turned on, the first magnetic core is made in the form of a ring, and one 35 end The magnetostrictive material is rigidly connected to the first magnetic core, which is distinguished by the fact that, with the aim of increasing sensitivity and 40 conversion accuracy, the rod of magnetostrictive material is located inside the first magnetic core, and its other end is rigidly connected to the first magnetic core. - 45 by means of a de-magnetic plate through a non-magnetic spacer, while a rod of magnetostrictive material on which the control winding is placed is located in the inserted bimetallic screen. Subscription