SU851673A1 - Electrodynamic vibration exciter - Google Patents

Description

   , one

The invention relates to electro. technique, in particular to the excitation of mechanical oscillations by an electromagnetic method, and can be used for vibration tests of massive components and children's radio-electronic devices for horizons vibrations.

Known vibroevoditel containing the inductor, made in the form. several flat serrated stator with multi-phase winding, and movable measles. This vibration locomotive (an amplifier allows to increase the motion of a mobile element with a high value of the disturbing force l. H) the complex core structure, assuming a special case for fastening the excitation winding frame, a large envelope of the exciter due to the massive core poles and the forked stator inductor, as well as low efficiency due to the reduction of the area of energy conversion by the magnitude of the pole division of the inductor.

Closer to the proposed technical entity is an electrodynamic vibration exciter comprising an inductor carrying an alternating current winding and movable measles with

DC winding having psevtosny division equal to the pole division of the inductor winding. Such an embodiment of the exciter allows to increase the efficiency and magnitude of the disturbing force at the same electrical costs, and also simplifies the design of the core 2. However, in the specified vibration exciter, the principle of the spin is impossible to realize the most economical resonant mode of operation when adjusting the frequency of the disturbing force, since its only value exists equal to the natural frequency of the mechanical system of the vibration exciter, in which the latter operates in a resonant mode.

The purpose of the invention is efficiency, the vibration exciter, the extension of the range 20, by adjusting the amplitude of the oscillations of the core when the frequency of the disturbance changes, the force.

The goal is achieved by the fact that the fixed inductor is supplied with

25 two END magnets having a polarity opposite to the polarity of the ends of the cores against which it is “installed, and the length of the core exceeds the length of the inductor HF (1 + J) times,

30 where P is the number of rfap poles of -ductance ..

The drawing shows an electrodynamic vibration exciter, a longitudinal section.

The vibration exciter comprises an inductor, made in the form of a toothed laminated magnetic circuit 1, in whose slots an alternating current winding is placed, for example, a three-phase winding 2, and movable measles, made in the form of a toothed charge marnithore 3, in the slots of which is placed “0 on winding 4 fixed” current, the pole division of which is equal to the pole division of the winding of the inductor 2. The length of the core magnetic core 3 exceeds the length of the magnetic circuit of the inductor 1 at both ends of the latter by the magnitude of the pole division. Under the protrusion of the core ends on both sides of the inductor, there are permanent magnets 5, the polarity of which is opposite to the polarity of the core ends / against which they are located. In order to eliminate the magnetic coupling between the inductor and the permanent magnets 5, the gap size dif between the magnetic core of the inductor 1 and each permanent magnet 5 is set larger than the gap cfa between the magnetic cores of the inductor 1 and the core 3 so that v (4 5) da. To prevent magnetic attraction of the core to the inductor and to provide horizontal movements of the core, the latter is fixed on the frame b mounted on the support bearings 7. Vibrational energy is introduced into the working area with a rod 8 fixed with a bark by means of fasteners 9 .

Vibro works as follows.

When the inductor winding is powered by 2 40 three-phase current, and the winding is 4-core by direct current, in the gap cfa a magnetic field of the core and a running magnetic field of the inductor are created.

In the interaction of the magnetic fields of the core and the inductor, a disturbing force is formed that is variable in magnitude and direction, causing an oscillatory motion of the core. The oscillation frequency jg core is equal to the frequency of the current supplied to the winding of the inductor 2. When adjusting the magnitude of the direct current of the winding 4 core, the force arising between the permanent magnets 5 located along the edges of the inductor and the windings 4 cores opposite the magnets are positioned. Thus, the reduced rigidity of the mechanical system of the exciter is adjusted, which allows the adjustment of the exciter to the resonant mode when the frequency of the disturbing force is changed.

Constructive execution of the movable core in the form of a gear magnet circuit with o6MOTKOli direct current, having a somewhat larger length than an unplugged inductor, and the location of the two permanent magnets at both ends of the last will allow the vibration exciter to be adjusted when adjusting the frequency of the force disturbance as a result of the mechanical tuning system on the resonance mode reduced rigidity. In addition, the vibration exciter design allows for a wider range of crust control when the frequency of the disturbing force is changed.

Claims (2)

1. Authors certificate USSR 284133, cl. H 02 K 33/18, 1968. 2. USSR author's certificate, No. 545047, cl. H 02 K 33 / 00,1972.