RU2480779C2 - Ferroprobe shunt - Google Patents

Abstract

FIELD: measurement equipment.

SUBSTANCE: ferroprobe shunt includes a core closed for an excitation flow made of soft magnetic material, excitation, measurement and feedback windings, at the same time the core is made in the form of a truss with two contact sites connected by arc plates, at the same time excitation windings are arranged at longitudinal, and measurement and feedback ones - on their orthogonal transverse sides of arc plates in close proximity to contact plates.

EFFECT: detection of zones with higher and lower concentration of magnetic flows in ferroprobe structures.

2 dwg

Description

The invention relates to the field of measuring the magnetic field parameters of structures made of ferromagnetic material, for example a ship hull.

A flux-gate shunt as a magnetic flux sensor is designed to identify zones with increased and decreased magnetic flux concentration in structures, determine the spatial orientation of fluxes, and also as a link in an automatic control system that generates a mismatch signal between the initial magnetic flux of an object and a compensation flux.

A known design of a single-component flux gate with two cores of soft magnetic material with excitation windings deposited on each of them and common measuring, feedback, and compensation windings for the cores. Also known are the designs of fluxgates with cores closed for the excitation field, for example, toroidal and ellipsoidal (Afanasyev Yu.V. Ferrozondy, L., Energia, 1969; Yu.V. Afanasyev and other magnetometric transducers, devices, installations. L., Energy, 1972).

The recorded value of such flux gates is the magnetic field acting along the longitudinal axis of the measuring winding. Sensors of this type are usually installed in the vicinity of the structure and thus the components of its scattering field are recorded.

The closest to the essence of the proposal is the invention according to US patent No. 6.456.069 B1 from 09.24.2002, in which the core of the flux gate is made in the form of the letter E and at the same time its legs are installed on the surface of the structure - the prototype.

The field winding is wound on the middle leg, the measuring windings between the legs on the base, and the calibration windings on each leg. Such a fluxgate registers a magnetic flux branching from the body of the object and passing through its core.

The disadvantages of the prototype are:

1) the dependence of the excitation mode and, as a consequence, the dependence of the sensitivity on the magnetic conductivity of the gap between the legs of the sensor and the body of the structure and the conductivity of the section of the structure adjacent to the legs of the sensor;

2) the susceptibility of the sensor to the magnetic fields of external sources, the directions of which are parallel to the axes of the measuring windings.

The invention consists in:

- the choice of the core configuration, ensuring the constancy of the magnetic resistance to the excitation flow due to the closure of the soft magnetic material;

- introducing pads into the core structure to create magnetic contact with the body of the object;

- placement of the measuring windings in the immediate vicinity of the contact pads on the transverse sides of the shunt orthogonal to the surface of the object.

As a result, the magnetic flux becomes the recorded value of the flux-gate transducer.

The invention is illustrated by drawings, where figure 1 shows the configuration of the core of the flux-gate shunt with the location of the field windings, measuring and feedback, as well as the path of the magnetic flux of the field. Figure 2 shows a full-face view of a flux-gate shunt with windings installed on the surface of the object, the paths of the magnetic flux lines of the object, a part of this flux closing through the magnetic circuit, the core and the flux of external sources parallel to the longitudinal axis of the shunt.

The core of the flux-gate shunt is a core of a special shape 1. Assembled, the core is a truss with two contact pads 2 connected by arched plates 3. For technological reasons, the core is prefabricated. Field windings 4 are applied to the longitudinal sides, and measuring windings 5 and feedback 6 to the transverse sides of the core plates.

Field windings are applied to each of the longitudinal sides and are interconnected so that a closed field of excitation is formed, as shown by the field lines 7 (Fig. 1).

Measuring windings and negative feedback are applied to each pair of transverse sides and connected together in series and according to the field that closes through the shunt.

In order not to clutter the drawings, the connections between the windings, as well as possibly the required compensation and calibration windings are not shown in the drawings.

Figure 2 shows a flux-gate shunt mounted on the body of the object 8, the lines of force of the magnetic field 9 inside the object, the lines of force of the field 10, which are closed through the core of the shunt and the lines of magnetic field of the external sources 11.

The flux gate shunt allows you to judge the magnetic flux in the body and in other elements of the object by registering the flux linkage of a portion of the flux that closes through the core of the flux gate shunt with turns of the measuring windings.

The stability and independence of the shunt from the magnetic conductivity of the material of the object and the magnetic resistance of the gap between the body of the object and the core are ensured by the closure of the excitation field completely along the soft magnetic core material, and the high magnetic permeability of the material, many times higher than the permeability of the material of the object, provides a shunt effect.

In order to reduce the magnetic resistance of the gap between the body of the object and the shunt, the core is proposed to be performed with pads. In this case, it is necessary to provide for the possibility of processing the surface of the object in places of contact with the shunt sites.

Measuring windings and negative feedback windings are supposed to be placed on each of the pairs of transverse plates of the shunt core in close proximity to the contact pads. This arrangement provides the maximum flux linkage of the turns of the windings with magnetic flux branching from the object.

In this case, flux linkage with magnetic fields of external sources, the direction of which coincides with the plane of the turns of the windings, is absent.

The technical advantages of flux gate shunts over the prototype are:

1. The possibility of determining in flux-gate structures of zones with increased and reduced concentrations of magnetic fluxes, the dependences of their spatial orientation and levels on the modes and conditions of the object;

2. The possibility of creating magnetic flux sensors based on flux-gate shunts installed in the interior directly on the housing and other structural elements, an object magnetic field compensation system acting on the principle of a closed loop.

Claims (1)

A flux gate shunt, which includes a core made of soft magnetic material closed for the excitation flow, field windings, measuring and feedback, characterized in that the core is made in the form of a truss with two contact pads connected by arched plates, while the field windings are located on the longitudinal and measuring and feedback - on the transverse sides of the arched plates orthogonal to them in the immediate vicinity of the contact plates.

Images