SU824391A1 - Method of exciting electromotive force in ferromagnetic wire - Google Patents

Description

one

The invention relates to electrical engineering and is intended for use in electric current generators, as well as in the sensor of devices for measuring non-electric quantities by electrical methods.

A known method of exciting an emf based on the piezoelectric effect and providing a polarization of a solid body under the influence of external forces 1.

However, the known method is not applicable to bodies with ferromagnetic properties.

The closest technical solution to the present invention is the method of exciting the emf in a ferromagnetic wire, consisting in its magnetization and subsequent elastic deformation. The known method involves magnetizing the wire with a circular magnetic field by passing a constant electric current through it. The subsequent elastic deformation is carried out by stretching the aaf2J.

A disadvantage of the known method is that after each stretching the wire must be re-magnetized, since the residual circular magnetization is destroyed by the action of tensile forces. This circumstance causes a considerable complexity of the known method and a small effect in its practical implementation.

The aim of the invention is to simplify the method of exciting EMF and increase its efficiency. The latter can be increased, in particular, by allowing the excitation of alternating EMF.

This goal is achieved by the fact that in the method of exciting an emf in a ferromagnetic wire, consisting in its magnetization and subsequent elastic deformation, the wire is magnetized axially and subjected to torsion. The achievement of this goal also contributes to the fact that the wire is subjected to alternating torsion.

The essence of the proposed method is "then. when simultaneously acting on the ferromagnetic conductor of axial magnetization and elastic torsion, an emf arises in the conductor. The magnitude of the EMF depends on the length of the magnetized area of the wire, the magnitude of the residual magnetization and

the angular velocity of the elastic torsion or unwinding of the wire. At the same time, the value of the axial tension of the wire does not significantly affect the value of the emf. EMF is also excited when the ferromagnetic wire is placed in an axial magnetic field and subjected to elastic torsion. The direction of the EMF depends on the direction of the magnetic induction vector in the wire and on the direction of the torsion of the movable end of the wire (the end of magnetization) relative to the stationary one.

FIG. 1 shows a general scheme for the implementation of the proposed method; in fig. 2 - wire, axially magnetized on one of its sections; in fig. 3 is a section to A-A in FIG. 1 and 2 (on a larger scale).

Ferromagnetic wire 1 (Fig. 1) is mounted on supports 2 and 3 and is pulled on by weight 4. On lead 1 in the middle there is a leash 5 of diamagnetic material. The ends of the wire 1 wires 6 and 7 are connected to the measuring device 8.

The proposed method is carried out as follows.

Ferromagnetic wire 1 is known to be magnetized axially by a known method, for example, in the area from support 2 to driver 5 (FIG. 2), after which the driver 5 is subjected to elastic torsion at an angle f (FIG. 3). In this case, an electromotive force is excited in the wire 1, and the measuring device 8 registers an electric current in the circuit. After twisting the wire 1 through the angle -f, it is turned in the opposite direction, and the current flows again in the circuit, but in the opposite direction. In order to excite the EMF of an alternating direction, including a sinusoidal form, the wire 1 is subjected to a torsional alternating oscillation using a known method.

In order to increase the amplitude of the EMF, the ferromagnetic wire 1 can be magnetised axially in the section from support 2 to the leash 5. in one direction, and in the section from support 3 to the leash 5 in the other direction. In this case, the magnetic induction vectors of the magnetized areas will be directed in opposite directions, and in the implementation of torsional alternating oscillations of the wire 1, an emf of a higher magnitude will be excited.

The use of the proposed method allows for a single magnetization of a ferromagnetic wire and alternating elastic torsion to realize multiple excitation of EMF without an “idle run.

Claims (2)

1. A method of exciting an electromotive force in a ferromagnetic wire, consisting in its magnetization and subsequent elastic deformation, characterized in that, in order to simplify and increase efficiency, the wire is magnetized axially and subjected to torsion. 2. A method according to claim 1, characterized in that, in order to excite alternating electromotive force, the wire is subjected to alternating twisting. Sources of information taken into account in the examination 1. Worth Ch. And Thomson R. Solid State Physics, M., “Mir, 1969, p. 415-416. 2. Akulov N. S., Volkov D. I. and Belov K. P On a single electroelastic effect in ferromagnetic bodies. - “Journal of Experimental and Theoretical Physics. 1935, p. 7, issue. 7-10, p. 946.