SU1222322A1 - Electrodynamic vibration exciter - Google Patents

Description

2. The vibration exciter according to claim. 2, which is characterized by the fact that the spiral cylindrical winding is provided with an electrically conductive frame.

The invention relates to a vibration technique and can be used with EiaHo in electrodynamic vibration stands.

The purpose of the invention is to increase the efficiency and the efforts developed by the exciter.

Figure 1 shows the exciter incision; in Fig.2-4 - node 1 in Fig.1; Fig. 5 illustrates the electrically conductive frame of a single-layer helical cylindrical winding, in isometric view.

The electrodynamic vibration exciter contains a closed laminated core 1 with a central rod 2, side rods 3 and pole pieces 4, installed on the middle parts of the rods 3 with an air gap 5 relative to the rod 2, short-circuit the movable element in the form of a helical cylindrical winding 6, the ends of which shorted between each other, mounted in the gap 5 by means of elastic suspensions 7, and fixedly mounted on the core 1 outside the gap 5 according to the connected windings 8 and 9 of alternating current, and all RIVER included winding 10 and 11 bias. The winding 6 is wound around a shaped conductor 12, which may have a B-shaped (FIGS. 2 and 3) or rectangular (FIG. 4) section. If the winding 6 is made single-layer, then its ends can be short-circuited through an electrically conductive frame 13, which has a longitudinal section 14. The vibration exciter is equipped with a table 15 to which the test object can be attached.

Bibroseater works as follows.

When powered in accordance with the included windings 8 and 9, an alternating magnetically induced longitudinal section is induced in the saddle in alternating current, located on this frame in one layer and electrically closed on its ends.

ny flow F 5 which in turn induces in the short-circuited winding covered by it 6 alternating current of the same frequency as the current of the windings 8

and 9. In the interaction of variable

the current of the winding 6 with a constant magnetic flux FD of the magnetization excited by the windings 10 and 11, in the zone of the air gap 5 an electromechanical force occurs causing the winding to oscillate 6. Since the spiral in the spiral cylindrical winding 6 is connected to each other in series, the density induced

in it, the alternating current is constant along the height of this winding, despite the distribution 3 of the inductive resistance of these turns, which makes it possible to increase the efficiency and the magnitude of the force developed by the exciter.

Based on the strength and cooling conditions, the winding 6 is manufactured with no more than two layers. With

the two-layer winding 6 short circuit is accomplished by connecting the ends of the winding to one of the ends of the coil. In the case of winding 6 single-layer, its short circuit is carried out by connecting each of its ends to the corresponding end of the frame 13, made of high-strength electrically conductive material. In this case, the current between the ends of the winding 6, which is closed through the frame 13, eliminates the torsional component of the electrodynamic force due to the spiral winding of the winding 6, and the frame itself,

even with a negligible thickness, it significantly increases the rigidity of the winding 6. A longitudinal section 14 in the frame 13 makes it possible to exclude a short MbiKaHi; i.e., each of the two extreme turns of the winding 6, is found on the edge

(or outside) the air gap 5, in the place of electrical contact of the ends of the winding with the frame 13.

Since in the winding 6, as in the entire spiral winding, the coils are interconnected in series, the current density in it is the same as the height of the gap 5, regardless of the difference in inductance of each of the coils. Consequently, over the entire height of the gap 5, the maximum allowable electrodynamic coupling is realized.

the action of the magnetic field with the maximum (from the conditions of the teip calculation) current of the winding 6 along the entire active length of its conductor 12.

Such a design of a moving coil allows a 15% increase in pushing force and a 7% efficiency compared to, for example, the design of a moving element made in the form of a hollow electrically conductive cylinder.

SrigL

/ J

FIG. five

Editor N.Rogulich

Compiled by V. Davydov

Tehred I. Popov Corrector V. But ha

1640/6 Circulation 428 Subscription VNISHTI of the USSR State Committee for Inventions and Discoveries 4/5, Moscow, Zh-35, Raushsk nab., 113035

Branch ShSh Patent, Uzhgorod, st. Project, 4

Claims (2)

1. ELECTRODYNAMIC VIBRATOR,. comprising a closed lined core with a central and side rods, a short-closed movable element installed in the air gap between the central rod and the pole pieces, and fixedly mounted on the core outside the air gap according to the included excitation windings. alternating current, as well as counterclockwise magnetization windings, characterized in that, in order to increase the efficiency and developed efforts, the short-closed movable element is made in the form of a spiral cylindrical winding from a shaped conductor, the ends of which are short-circuited with each other. φνι.Ι 2. The vibration exciter according to claim 1, characterized in that the spiral cylindrical winding is provided with an electrically conductive frame having a longitudinal section, is located on this frame in one layer and is electrically closed to it by its ends.