RU2556U1 - ELECTRODYNAMIC SUSPENSION VEHICLE - Google Patents

Abstract

An electrodynamic suspension vehicle comprising a traction motor, a crew with a superconducting suspension solenoid, an electrically conductive track, characterized in that the track is made of longitudinal strips with different conductivities, with the extreme stripes having a higher conductivity with respect to the center strip .

Description

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Transport medium with electrodynamic suspension.

The utility model relates to electrical engineering, namely, vehicles with electrodynamic suspension. Known vehicles with a magnetic suspension of the crew, with linear traction motors, suspension solenoids located on the carriage, ferromagnetic track guides (Yu.A. Bakhvalov and others. Transport with a magnetic suspension, M., Engineering 1991, p. 48). The disadvantage of these systems is the instability of the suspension, if the current of the solenoid is not regulated depending on the size of the gap between the crew and the track. This is due to the fact that the suspension force is attractive, and with a decrease in the gap between the suspension solenoid and the ferromagnetic track guide, the force tends to reduce this gap, which necessitates the use of suspension solenoid current control systems.

In a vehicle (Edited by R. Thornton, Land Transport of the 80s, M., Mir., 1974, p. 100), selected as a prototype, this drawback can be avoided, because the suspension force of the crew is repulsive, and with a decrease in the gap between the solenoid and the electrically conductive track, the repulsive force increases. The prototype contains a linear traction motor, suspension solenoids and an electrically conductive track. When the solenoid moves relative to the electrically conductive track, eddy currents are induced in the latter, the interaction of which with the magnetic field of the solenoid is expressed in the appearance of a repulsive force.

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The main disadvantage of the prototype is that with a lateral displacement of the suspension solenoid (with a finite width of the electrically conductive part of the track) relative to the symmetrical position, a transverse force begins to act on the latter, tending to increase the displacement of the solenoid indicated above, which inevitably leads to an increase in the crew's ability to go beyond the track while the latter is directly related to the operational reliability of the vehicle. The authors faced the task: to create a vehicle on an electrodynamic suspension, which allows to increase its operational reliability.

This problem is solved in that in the claimed vehicle on an electrodynamic suspension containing a traction non-linear electric motor, a crew with a superconducting suspension solenoid, an electrically conductive track, the latter is made up of longitudinal strips with different values of specific conductivities, and the extreme strips with respect to the central strip have higher conductivity.

Comparative analysis with the prototype shows that the claimed vehicle is characterized by the presence of extreme bands with higher conductivity with respect to the central strip. Thus, the claimed vehicle meets the criterion of novelty.

An analysis of the essential features of the proposed utility model in this and related fields of technology, taking into account the condition that they are all in a single logical chain and are aimed at achieving the same result, is performed using an example (I.A. Glebov et al. Turbogenerators with using

superconductivity, L. Science, 198.1, p. 27). In the identified device (cryoturbogenerator), an electrically conductive screen consisting of copper and titanium shells is used to protect the superconducting winding from alternating magnetic fields. Obviously, this device in its design and goals achieved is not equivalent to the claimed device. This in turn allows

to draw a conclusion on the correspondence of the alleged edocel goal to the criterion of yo. and gives reason to protect it

priority.

The suspension unit of the described vehicle with electrodynamic suspension is shown in figure 1. Figure 2 shows, schematically, the mechanism of formation of the transverse stabilizing force.

The composition of the suspension unit (figure 1) includes a superconducting solenoid 1 and an electrically conductive track, including

self central 2 and extreme 3 conductive stripes. Here, the distribution of levitation forces F | excluding

edge effects. The mechanism of formation of the transverse stabilizing force is presented in figure 2. When the solenoid 1 moves in an electrically conductive track, currents are induced. The interaction of these currents with the magnetic field of the solenoid 1 determines the appearance of the interaction force between them, the value of which is proportional to the productivity of the track and is determined by the expression:

F (t, x) Ib i (t, x (

level

where Ib - M.D.S. superconducting solenoid 1; i (x; t) currents induced in the web 2, 3; M (x; y; z) is the mutual inductance coefficient; and - the coordinate along which the crew shifted.

The magnitude of the current induced in the conductive sheet is proportional to the electrical conductivity of the sheet i (t; x)

As can be seen from figure 2, the interaction force between the solenoid 1 and

main lane 2 consists of two components:

Similarly, the force of interaction between the extreme strip 3 and the solenoid 1 can be represented by the expression:

Forces Fyi and Fy2 are directed counter-to each other. Since the conductivity of the side bands is higher, then Fy2 Fyi and the resulting

shear force is stabilizing:

which leads to increased reliability of vehicles.

For example, if the central strip is made of aluminum (,), then the transverse force Fy2 is 65.7% greater

shear force fy- | according to relations (1) and (2), ceteris paribus, (side strips are made of copper with a specific resistance of 2.83 10 Ohm m).

Fi FLi + Fyi

P2 F | i + Fy2

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Claims (1)

An electrodynamic suspension vehicle comprising a traction motor, a crew with a superconducting suspension solenoid, an electrically conductive track, characterized in that the track is made of longitudinal strips with different conductivities, with the extreme stripes having a higher conductivity with respect to the center strip .