RU2349018C1 - Linear asynchronous motor - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention relates to electrical engineering and deals with electrical drives with linear or reciprocal motion of operating components and may be used for electrical transport. The linear asynchronous motor includes induction coil consisting of an iron with multiphase winding. The secondary element contains the iron with grooves having insulated current-conducting rods inserted into them and placed one above the other. From one side, the current-conducting rods are closed by the common current-conducting bus. From the other side, they are closed by closing cylinder consisting of a current-conducting part and insulating part. The cylinder is provided with handle. The secondary element iron grooves have the central part, which is perpendicular to the horizontal axis of closing cylinder and adjoining side parts at equal angle from both sides. All current-conducting rods describe the groove shape.

EFFECT: ensured cross stabilisation.

5 dwg

Description

The invention relates to the field of electrical engineering, and more specifically to linear induction motors (LAD), intended for electric drives with rectilinear or reciprocating movement of the working bodies and electric vehicles.

A linear induction motor is known, comprising an inductor consisting of a core and a three-phase winding, and a secondary element consisting of a core, in the grooves of which are insulated conductive rods, one above the other, closed on one side by a common electrically conductive bus, and on the other, by a closing cylinder, consisting of of electrically conductive and insulating parts, mounted with the possibility of rotation around its horizontal axis (see, for example, the USSR AS IPC Н02K 41/025, No. 1350778, 87, RF patent IPC Н02K 41/025, No. 1823094, 93 g.).

These LADs are not able to develop stabilizing forces with lateral displacement of the secondary element relative to its inductor.

The closest in technical essence to the claimed one is LAD containing an inductor consisting of a core and a three-phase winding, and a secondary element consisting of a core, in the slots of which are located one above the other insulated conductive rods, closed on one side by a common conductive bus, and with the other is a locking cylinder, consisting of electrically conductive and insulating parts, mounted with the possibility of rotation around its horizontal axis (see AS USSR MPK Н02K 41/025, No. 1104619, 84). This LAD is selected as a prototype.

The inability of this LAD to develop lateral stabilization efforts with lateral displacement of the secondary element relative to the inductor is a disadvantage of the prototype.

The technical task of the present invention is to eliminate the noted drawback in the developed design of LAD.

The solution to this technical problem is achieved by the fact that in LAD containing an inductor consisting of a core and a three-phase winding, and a secondary element consisting of a core, in the grooves of which are located one above the other insulated conductive rods, closed on one side by a common conductive bus, and with the other is a locking cylinder, consisting of electrically conductive and insulating parts, mounted to rotate around its horizontal axis, according to the invention, the grooves of the core of the secondary element They squeeze the central part perpendicular to the horizontal axis of the closing cylinder, and the side parts adjacent to it at equal angles on both sides, while all the conductive rods repeat the shape of the groove.

The execution of the grooves of the core of the secondary element containing the central part perpendicular to the horizontal axis of the closing cylinder, and the side parts adjoining it at equal angles on both sides, while all the electrically conductive rods repeat the shape of the groove - these signs determine the novelty and significant differences of this technical solution.

The invention is further illustrated by an example of its specific implementation with reference to the accompanying drawings, in which:

figure 1 depicts a General view of the LAD (cross section);

figure 2 - secondary element LAD (top view schematically);

figure 3 shows the LAD, the secondary element of which is offset to the left relative to the inductor LAD;

figure 4 shows the direction of action of the forces applied to the secondary element LAD, with a symmetrical arrangement of the secondary element relative to the inductor;

5 is the same with lateral displacement of the secondary element relative to the LAD inductor to the left.

LAD (figure 1) contains an inductor consisting of a core 1 and a three-phase winding 2. The secondary element 3 consists of a core 4, in the grooves of which are located one above the other insulated conductive rods 5, closed on one side by a common conductive bus 6, and on the other parties - closing cylinder 7, consisting of electrically conductive and insulating parts and equipped with a handle 8.

Figure 2 shows a schematic top view of the secondary element. It can be seen that the grooves and the conductive rods 5 contain a central part 9 and side parts 10 and 11. The remaining designations are the same as in figure 1.

Figure 3 shows the lateral displacement of the secondary element 3 relative to the LAD inductor. Here, all the notation is the same as in figure 1.

Figure 4 shows the forces acting on the secondary LAD element with a symmetrical arrangement of the secondary element relative to the inductor: F ₁ and F ₂ - forces acting on the secondary element; F _b1 and F _b2 - transverse forces acting on the secondary element; F _T1 and F _T2 - traction forces acting on the secondary element. The remaining notation is the same as in figure 2.

Figure 5 shows the same forces as in figure 4, but with lateral displacement of the secondary element relative to the LAD inductor.

Consider the principle of operation of this LAD.

When a three-phase winding 2 is connected to a three-phase voltage source, a traveling magnetic field is created that intersects the rods 5 of the short-circuited winding of the secondary element and induces electromotive forces (EMF) into them. Under the influence of EMF in the rods 5 will flow currents interacting with a traveling magnetic field. As a result of this interaction, mechanical forces F _Tcp , F ₁ and F _{2 are created} , applied respectively to the central and lateral parts of the secondary element. The efforts of F ₁ and F ₂ decompose into components F _T1 , F _T2 , F _b1 , F _b2 . Traction forces F _Tcp , F _T1 and F _T2 set in motion the secondary element, and forces F _b1 and F _{b2 of the} same magnitude (FIG. 1 and FIG. 4) mutually balance each other and do not affect the movement of the secondary LAD element. When the secondary element is displaced relative to the LAD inductor to the left (Fig. 3), part of the winding of the secondary element is outside the inductor (Fig. 3). Therefore, the forces F ₁ and F ₂ resulting from the interaction of the traveling magnetic field with the currents of the secondary element will become unequal (F ₁ <F ₂ ). At the same time, the equality of the transverse forces F _b1 and F _{b2 is} violated (Fig. 5), and F _b1 <F _b2 . Under the action of the difference in transverse forces F _b2 -F _{b1, the} secondary LAD element will automatically return to a symmetrical position relative to the inductor (Fig. 1 and Fig. 4). Thus, automatic transverse self-stabilization of the secondary element relative to the LAD inductor will be carried out. Moreover, with an increase in the transverse displacement of the secondary element, the difference in the transverse forces F _b2 -F _b1 , which returns the secondary element to a symmetrical position, will proportionally increase. As with the prototype, by rotating the closing cylinder 7 (FIG. 1 and FIG. 2), it is possible to change the resistance value of the short-circuited winding of the secondary element and adjust the amount of mechanical forces and the speed of the LAD movement.

Compared with the prototype, the ability to create lateral stabilization efforts with lateral displacement of the secondary element relative to the LAD inductor is realized.

Claims (1)

A linear induction motor containing an inductor consisting of a core and a three-phase winding, and a secondary element consisting of a core, in the grooves of which are insulated conductive rods, one above the other, closed on one side by a common electrically conductive bus, and on the other, by a closing cylinder, consisting of electrically conductive and insulating parts mounted rotatably around its horizontal axis, characterized in that the grooves of the core of the secondary element contain a central part, perp ndikulyarnuyu horizontal axis of the lock cylinder and adjacent thereto at the same angle with the side portions on both sides, all the electrically conductive rods repeated groove shape.

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