SU765913A1 - Magnetomechanical transducer - Google Patents

Description

The invention relates to electrical, equipment, and automation and can be used as a generator of adjustable movements.

Magnetomechanical transducers 5 are known, which consist of an excitation winding, magnetic armature and a mini-sharpener of ferrites or magnetic alloys - metal groups of the iron group l.

The error of these transducers is a small amount of realizable displacements due to small magnitudes of magnetostrictive deformations.

The amount of movement can be increased by 15 selection of the material of the magnetostrictor. Thus, a magnetomechanical transducer is known, comprising an excitation winding and a magnetostrictive core made of a rare-earth metal-iron type Laves phase {23.

The amount of movement of the moving part of the converter is somewhat larger than that of the previous one, but still 25 is relatively small. The range of displacements with a linear dependence on the intensity of the magnetic field created by the excitation winding is also small.

The aim of the invention is to increase displacements and expand the range of displacements with a linear dependence on the {intensity of the magnetic field.

This is achieved by the fact that a magnetomechanical transducer containing an excitation winding and a magnetostrictive core of a rare-earth metal compound such as the Laves phase, is equipped with a spring of ferromagnetic material, and at the ends of the core there are magnetic flux concentrators made of a material with positive longitudinal magnetostriction,

The essence of the invention is that the preliminary mechanical compression of the core by means of a spring changes the initial magnetic state of the core material, thus extending the interval of the linear dependence of the displacement on the intensity of the exciting field, and at large fields increases the magnitude of the displacements.

1 shows a magnetomechanical transducer; FIG. 2 shows the same, section A-A in FIG. 1; FIG. 3 shows the dependence of the "displacement of the movable part of the converter on the strength of the magnetic field for different values of the longitudinal compressive stress." (for curves a, b, c, and g, the compressive stresses, respectively, are 0; 0.9 kgf / mm 3.1 kg / mm and 9.9 kgf / mm).

The converter consists of an excitation winding 1, a compression spring 2, a fixed part of magnetic armature 3, magnetic flux concentrators 4 with an apex angle of 90-12 °, and a magnetostrictive card-; 5, the movable part of the magnetic armature 6. The magnetic armature and the spring are made of magnetic material to ensure the closure of the magnetic flux. The fixed part of the magnetic armature consists of a nut V, a screw 8 and a washer 9. The washer 9 is rigidly fastened to the frame of the field winding. To limit the rotational movement of the nut when screwing in the screw, the nut and washer have a longitudinal groove and a protrusion, respectively. The moving part of the magnetic reinforcement has the ability to move relative to the frame of the excitation winding when the spring is stretched. The magnitude of the displacement of the movable part of the magnetic reinforcement when the spring is stretched is selected from the condition of the maximum required compressive magnetostrictive stress bar. The degree of compression of the magnetostrictor depends on the amount of movement of the nut relative to the washer.

The device works as follows.

Screw 8 sets the required (see Fig. 3) compressive magnetostriction rod 5 voltage at the expense of spring 2 to provide the selected mode of operation: maximum movement of the moving part of the converter and spacing with a linear functional dependence of the movement on the intensity of the magnetic field generated by the excitation winding. Then turn on the current through the excitation winding 1.

As the current increases from to, o) c, the linear size of the magnetostrictive rod 5 with the concentrator 4 increases, which leads to movement of the moving part b and stretching of the spring 2. As the current decreases, the linear size of the rod decreases and the moving part b under the action of the spring 2 moves in the opposite direction.

The use of this magnetomechanical converter allows, without changing the mass of the magnetostrictor from the rare-earth compound

metal - iron type Laves phase and

the power consumed by the excitation winding, to significantly increase the controlled displacements and the range of displacements: with their linear functional dependence on the strength of the magnetic field.

The tests carried out showed that in a magnetic field of 5 k, created by the excitation winding, the device, with a compressive voltage of 10 kgf / mm

allows to obtain large displacements of 1.35 times, and the range of displacements with their linear functional dependence on the strength of the magnetic field increases with a 3-fold increase in the compressive stress compared with the prototype.

Claims (2)

1. USSR author's certificate 261523, cl. H 02 N 11/00, 1968. 2. The study of high cage stricture materials based on REM, Report of the Physics Department of Moscow State University, topic 46/75, published 1977, p. 3 (prototype). LD Phi1.1 it mm Phage.