SU1254577A2 - Magnetic modulator - Google Patents

Abstract

The invention relates to radio engineering, in relation to auth.St. No. 116525 reduces the temperature error of the output signal. The device contains two magnetic cores 1 and 2, excitation windings 3 and 4, output windings 5 and 6, a capacitor 7, a housing 8 from a nonmagnetic material, a rod 9 from a magnetostrictive material, a control winding 10. Again, an additional rod 11 from magnetostrictive material, to-ry at one end rigidly connected to the second magnetic core 2, and the other to KopnycoMvB. 1 il. i (L

Description

The invention relates to radio engineering, can be used to generate amplitude modulated signals in radio engineering devices for various purposes, and is an improvement of the known device according to the main author. No. 1116525.

The purpose of the invention is to reduce the temperature error of the output signal.

The drawing shows the structural electrical circuit of the proposed magnetic modulator.

The magnetic modulator contains two magnetic cores 1 and 2, windings 3 and 4 of the excitation, output windings 5 and 6, a capacitor 7, a housing 8 from a nonmagnetic material, a rod 9 from a magnetostrictive material, a control winding 10, an additional rod 11 from a magnetostrictive material .

The magnetic modulator operates as follows.

The excitation windings 3 and 4 of the magnetic cores 1 and 2 are supplied with alternating voltage of the carrier frequency f. Since the output windings 5 and 6 are counter-connected, the difference signal at their output is zero. On the control winding 10 of the rod 9, an alternating voltage L of an amplitude varying voltage is applied. This voltage creates an alternating magnetic field, which accordingly causes the rod 9 of a magnetostrictive material to lengthen by a different size. Since the rod 9 is rigidly connected at one end with the housing 8, and the other with the magnesium core 1, the mechanical vibrations of the rod 9 are transmitted to the magnetic core 1.

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Under the action of the extension of the rod 9, the magnetic core 1 is compressed. Under the action of a variable compressive force in the magnetic core 1, alternating mechanical compressive stresses arise, which lead to a decrease in its magnetic permeability with a frequency of self.

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 a resonant circuit from capacitor 7 and output windings 5 and 6. Since the resonant circuit is tuned. If the carrier frequency is f, then it will have amplitude-modulated voltage.

When the magnetic modulator is operating under temperature fluctuations, linear deformations of the rods 9 and 11 and magnetic cores 1 and 2 occur, which cause the appearance of mechanical stresses in the magnetic cores 1 and 2 and a change in their magnetic permeabilities.

Claims (1)

Since the rods 9 and 11 mechanically act on the magnetic cores 1 and 2, the windings 5 and 6 of which are connected in opposite directions, the same temperature changes in the magnetic permeability mutually compensate. Invention Formula Magnetic modulator auth.St. No. 1116525, characterized in that, in order to reduce the temperature error of the output signal, an additional rod of magnetostrictive material is inserted into it, which at one end is rigidly connected to the second magnetic core and the other to the case from a nonmagnetic material.