SU777491A1 - Magnetoelastic force transducer - Google Patents

Description

The magnetic core is assembled from plates 1 of a ferromagnetic material with holes 2, in which magnetizing 3 and measuring 4 windings are mutually attached to the rio pendpendiculum. The winding planes are located at an angle of 45 ° to the direction of the force. Holes 5 are designed to apply a tensile force R. On the opposite sides of the magnetic conduit near the holes for the magnetizing winding, grooves 6 are made.

The proposed magnetic circuit is characterized by making recesses on the side of the ports of the magnetizing windings, which create additional stress concentrators in the zone of these holes, leading to a change in the magnetic anisotropy of the magnetic core and, consequently, to an increase in the output signal of the converter, i.e., to an increase in its sensitivity.

Induced in the measuring (secondary) winding of the magnetoelastic converter, the EMF is determined mainly by the magnitude of the magnetic flux surrounding it. Therefore, the sensitivity of the transducer is determined by the change in the part of the magnetic flux lines located near the secondary winding or covering it. The change in the magnitude of the magnetic flux created by the magnetizing winding is affected by the saturation of a part of the magnetic conductor adjacent to the holes for the magnetizing winding, which in turn is determined by the magnetic force, by its strength and magnetic permeability, depending on the magnitude of the measured force.

Therefore, the hole introduced into the magnetic core in the designated area must be used for the magnetizing winding. In this case, the change in the magnetic anisotropy of the material of the magnetic circuit

leads to an increase in the magnetic flux generated by the nerve winding, and consequently, to an increase in the output signal of the converter and to an increase in its frequency.

The introduction of the grooves in the area of the holes in which the magnetizing winding was placed, led to an increase in the sensitivity of the MPS about 2 times.

As can be seen from the graphs, the most effective use of the sensing element of the proposed power converter to achieve the greatest sensitivity of the latter is manifested when the depth of the notch is (10, 0.45) b and the distance between the edges of the notch and the node hole is magnetizing winding / g -0.4) 6.

Formula of Invention,.

A magnetoelastic force transducer containing a magnetic-permeable magnetic core with holes in which the magnetizing and measuring windings are mutually perpendicular, and the notches from the external circuit of the magnetic circuit, in order to draw the sensitivity of the transducer, the grooves are made from a force-sensitive profile. the area of the magnetic conductor at a distance of (0.15-0.4) b from the edge of the holes for the magnetizing winding and a depth of (0.15-0.45) b, where b is the width of the magnetic circuit.

Sources of information taken into account in the examination

1.Shevchenko G. I. Magnetic-anisotrophic sensors. M., “Energie, 1967, p. 22

2. US patent number 3664187, cl. 73-141, 1972, (prototype).

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Claims (1)

Claim . A magnetoelastic force transducer comprising a force-sensing magnetic circuit with holes in which the magnetizing and measuring windings are mutually perpendicularly laid and recesses' on the side of the external circuit of the magnetic circuit, characterized in that, in order to increase the sensitivity of the transducer, recesses are made between the power-sensing portions and the active zone of the magnetic circuit on a distance (0.15-0.4) b from the edge of the holes for the magnetizing winding and a depth of (0.15-0.45) b, where b is the width of the magnetic circuit.