SU1215028A1 - Arrangement for viabrational stabilization of movable part of moving-iron instrument - Google Patents

Description

The invention relates to electrical measuring equipment and is intended for use in instrument making.

The purpose of the invention is to increase the efficiency and effectiveness of stabilization.

Fig, 1 shows a functional diagram of the proposed device; Fig. 2 illustrates the dependence of the gain of the used amplifier with automatic adjustment of the gain on the level of the input signal; FIG. 3 shows the construction of the magnetic system used; 4, the oscillation lines of the maximum magnetic field in the gap of the magnetic system.

The device (Fig. 1) contains an alternating voltage source consisting of a series-connected low-frequency noise generator 1, a band-pass filter 2 and an amplifier 3, a bridge node, in one arm of which a coil 4 of the magnetic system is connected, and the other arms are formed by resistors 5 - 7 and inductance coil 8, amplifier 9 with automatic gain control and power amplifier 10. Amplifier 9 with automatic gain control is connected by an input to the measuring diagonal of the bridge node, and an output to the input of amplifier 10 of power. The outputs of the amplifier 10 of the power and the alternating voltage source (amplifier 3) are connected to the supply diagonal of the bridge node.

The magnetic system includes, in addition to the coil 4, a permanent magnet 11 (FIG. 3) and a flat ferromagnetic core 12 inserted into the coil 4, equipped with an end in the form of a square and oriented with a point along the axis of symmetry of the permanent magnet 11-. The air gap 13 of the magnetic system is formed by a permanent magnet 11 and a core 12 located above it. In the gap 13, the ferromagnetic sector 14 of the moving part to be stabilized is freely accommodated, while it has the possibility of rotation around the axis 15 of the moving part. Uniform exposure of sector 14 in the gap 13 is achieved, for example, by setting the holder 16 of the measuring mechanism of the device on the directions 17 as well as by the interaction of the sector 14 of the moving part with the shaft magnet 11 of the magnetic system.

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The elements 5-8 of the bridge unit are selected so that when the sector 14 of the stabilized movable part is inserted into the gap 13 of the magnetic system, the bridge unit is balanced. the voltage across its measuring diagonal is zero. Dp better balancing of the bridge node instead of elements 7 and 8 can be included coil of the magnetic system, similar to the used magnetic system, with a sector of the moving part inserted into its gap, similar to stabilized, but only with a braked axis.

The device works as follows.

In a broadband random signal from the output of the low-frequency noise generator 1, a band-pass filter 2 extracts a signal in the frequency range of 100-250 Hz, in which the resonant frequencies of the elements of the moving part to be stabilized are found, after which the signal is amplified by the power diagonal bridge node.

When current flows through the coil 4 of the magnetic system in the gap 13, an alternating magnetic field is formed with characteristic lines of oscillation of the maximum (Fig. 4). At the maximum of this, the floor tends to move around the sector 14 of the stabilized movable part and as a result of this oscillating motion occurs around the axis 15. As the sector and other parts of the movable part are rigidly attached to the axis 15, oscillations are transmitted to all parts, frequencies (such details for an electromagnetic device are an arrow, a holder, a damper wing). As a result of the reverse transfer of amplified resonant oscillations of parts to the axis 15 of the movable part and their displacement, some polyharmonic mechanical oscillatory movement of sector 14 occurs, and in terms of frequency and amplitude this movement corresponds to resonant oscillations of the parts. The oscillations of sector 14 result in iz. the inductive impedance of the coil 4 of the magnetic system included in the bridge node arm, which, in turn, causes the signal on the measuring diagonal to be proportional to the polyharmonic oscillations of sector 14. The initial oscillations of sector 14 are transmitted to different parts in different proportions (also the reverse effect is also heterogeneous), and even excitations of the same part at different frequencies are not equivalent. Therefore, the amplitudes of the frequency components of the polyharmonic signal on the measuring diagon of the bridge node are also different.

The signal from the measuring diagonal of the bridge node passes to the amplifier 9 with automatic gain control. the level Ug of the input signal (figure 2). At the output of amplifier 9, a signal is formed, in terms of frequency, proportional to the input, but inversely proportional to the amplitudes of the component frequencies. As a result, a polyharmonic voltage is applied to the supply diagonal of the bridge node with component frequencies that coincide with the resonant frequencies of the parts of the stabilized moving part, the amplitudes of which are inversely proportional to the degree of excitation of the resonance. If the resonance at any frequency is more easily excited, the supply voltage at that frequency is less and vice versa.

In this way, simultaneous and intensive excitation of the resonant oscillations of all parts of the stabilized moving part is achieved, which makes it possible to increase the efficiency of vibration stabilization. Boost

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Efficiency is due to the elimination of thermal stabilization and the cost of electricity necessary for its implementation.

5 pho. rmula of invention

1. A device for vibration stabilization of a moving part of an electromagnetic device containing an alternating voltage source and a magnetic system consisting of a coil and a permanent magnet, characterized in that, in order to increase the efficiency and effectiveness of stabilization, a bridge node, an amplifier with with an automatic compression gain control and a power amplifier, the magnetic system coil being included in one shoulder of the bridge node; the amplifier with automatic gain control is connected to the measuring diagonal via an input skeleton node, and output to the input of the power amplifier, the outputs of the power amplifier 25 and used source of alternating voltage connected to the supply diagonal of the bridge node.

2. The POP.1 device, characterized in that the magnetic system is made with a gap to accommodate a sector of the stabilized movable part, the gap being formed by a permanent magnet and a flat ferromagnetic core located above it, inserted into a coil, equipped with an end in the form of a square and oriented tip along the axis of the permanent magnet symmetry.

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Editor A. Ogar

Compiled by L.Morozov

Tehred J. Kastelevich Proof-reader I. Erdeyi

Order 902/52 Circulation 730 Subscription

VNISH1I of the State Committee of the USSR IT

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

Branch PPP Patent, ul.Proektna, d.4 / 5

Claims (2)

5 claims 1. A device for vibrational stabilization of the movable part of an electromagnetic device containing A nickel of alternating voltage and a magnetic system consisting of a coil and a permanent magnet, characterized in that, in order to increase the efficiency and stabilization efficiency, a bridge unit, an amplifier with automatic gain control and a power amplifier are introduced into it, and the coil of the magnetic system is included in one shoulder of the bridge junction, 20, an amplifier with automatic gain control is connected by the input to the measuring diagonal of the bridge unit, and by the output to the input of the power amplifier, the outputs of the power amplifier and the ac voltage source are connected to the supply diagonal of the bridge unit. 2. The device according to claim 1, characterized in that the magnetic system 30, the subject was made with a gap to accommodate the sectors of the stabilized moving part in it, the gap being formed by a permanent magnet and a flat ferromagnetic core located above it, inserted into the coil, provided with an end in the form of a square and oriented with a tip along the axis of symmetry of the permanent magnet. —Kalezania Line Nevermind