SU1257757A1 - Rotor of electric machine - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to expand the field of application of direct evaporative cooling. The rotor of an electric machine with evaporative cooling contains a winding and coaxial heat pipes (TTs), made in the form of winding holders. The body of the TT is made of two parts. The outer part 9 has a U-shaped cross-sectional shape and radial heat-conducting insulated plates 10 between themselves. The inner part 16 is made with fin 10 and provides condensation of the refrigerant, while the outer part provides evaporation of the coolant. Such an implementation of TTs ensures their use for various forms of winding conductors. 6 Il. i (L 22. 1C ate h “VI ate m ui.2

Description

The invention relates to electrical engineering and can be used to cool the rotors of electric machines (EM).

The purpose of the invention is to expand the field of application of direct evaporative cooling.

Fig, 1 presents the proposed rotor collector computers; 2, the same section; FIG. 3 is a section A-A in FIG. 2; in fig. A is a section B-B in FIG. one; in FIG. 5, node I in FIG. one; in fig. 6 - node II in figure 1

The rotor of the collector EM consists of winding 1 core, core 2 core, shaft 3, collector 4, front 5 and rear 6 winding holders of the ring TT 7 and 8, installed from the front and rear lob. Of the winding parts of the core. The body of the TT is made of two parts. The outer part 9 of these TTs, which are U-shaped hollow cylinders, are made of a dielectric material, for example, alundum ceramics. In order to provide a heat sink, T or L-shaped plates 10 made of thermally conductive material, such as copper, are installed in part 9 of the TT. The plates 10 are evenly spaced along the radius in the axial direction and have an outer short protruding 11 and an inner elongated 12 part. In the outer part 11 for connecting the plates to the conductors of the winding of the core there are grooves 13. The connection of the plates 10 TT to the collector 4 is carried out using nepeji bmeK

14, and the connection of the TT 8 with the conductors of the winding core is made by brackets

15. All connections are made.

using soldering. Internal nasti 16. TT 7 and 8, which are hollow cylinders of the U-shaped form, are made of heat-conducting material, for example copper. The use of specific materials for the plates 10 and part 16 depends on the type of refrigerant used. To supply the refrigerant to the heat pipe 8, in part 16 there is a threaded hole 17 in which a screw 18 is installed to ensure the tightness of the internal cavity of the TT. A coolant 18 is inserted into the internal cavity of the TT 7 through the hole 19 through the hole 19. The screw 21 serves as the internal cavity. Since the TT bodies are filled with composite ones:

5 0 5 o

five

0

five

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is provided by soldering the junction of the protruding part 11 of the plates 10 with the wall 9, the inner 16 and the outer 9 parts. To do this, a layer of silver is applied to the material from which part 9 is made, at the points of the above-mentioned joints. The inner surface of part 9 and plates 10 form the evaporation zone TT. When the EM operates under load, the refrigerant introduced into the CT through the opening 17 is distributed in a thin layer on the evaporation zone. Formed from heat sources, frontal parts of the core winding, heat flux passing through, winding holders, outer walls. TT, connecting brackets and plates 10 cause the refrigerant to heat and evaporate. The refrigerant vapor condenses on the inner surface of wall 16 (condenser zone), and the liquid formed under the action of centrifugal forces returns to the inner surface of wall 9. Heat removal from the capacitor zone TT is performed by axial air flow using ribs 22 and fastening elements ( coils, bushings, core core) in contact with the inner part 16. It is most convenient to install coaxial CTs in the area of the frontal parts of the rotor winding, but the same TTs can be installed between separate parts of the rotor core when distributed into sections. The TT is mounted on the core core bushing With the aid of ring lugs 23 on the inner parts of the 16 TT.

The assembly process of the rotor collector EM is carried out as follows.

The collector is first assembled on BTyjjKe. and core core with coils and coaxial CTs on the core sleeve. After pressing the core core and installing the stop ring, the core sleeve is installed on the core shaft. A tube for supplying a refrigerant is introduced into the TT from the front winding carrier side and plates are connected into the protruding part 11 of the plates 10 to be connected to the cocks of the collector. Then a collector is installed on the shaft core on the sleeve, the core winding is laid, brackets 15 are installed from the side

rear end parts and all connections are soldered

The use of coaxial CTs, the introduction of a section of dielectric material in their case, the installation of plates of thermally conductive material in this area, isolated between themselves and connected to the current-carrying parts of the rotor, makes it possible to expand the scope of direct evaporative cooling, since the proposed design can be applied; for various forms of conductors of the rotor winding, including for subdivided conductors, as well as for improving cooling, in particular, a collector for collector EM. As a result of using the proposed rotor design, the temperature of the current-carrying parts of the rotor can be reduced, and the electromagnetic loadings of the EMs can be increased. In the first case, the life of the EM is increased, as well as the efficiency of the EM due to a decrease in the temperature of the rotor winding, and consequently, the magnitude of losses in it. In the second case, the weight and dimensions of the EM are improved, since the ability of the EM can be increased as a result of current density in the conductors of the core winding while maintaining the consumption of active materials.

Thus, the use of the proposed design of a rotor with TT allows to improve the technical and operational

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The basic properties of EM for both general purpose and special purpose.

All parts and elements that make up the proposed rotor design are mastered by domestic industry, therefore, no additional costs and significant changes in the technology are required for the manufacture of EM. The proposed rotor design can be used for both DC and AC machines.

Claims (1)

Invention Formula The rotor of an electric machine with evaporative cooling, which contains a serrated; decar, current-carrying parts, a shaft, and heat pipes, is distinguished by the fact that, in order to expand the field of application, heat pipes are made in the form of winding holders and have the shape of hollow rings The two parts, the outer part of which is made of a dielectric material, mainly of alundum ceramics, has a U-shaped cross-section and are installed radially on the outer surface in the axial direction of a plate made of a heat-conducting mat iala, preferably copper, insulated between themselves and connected with the conductive portions and the inner oreb- formed with rhenium. / 75 3 2 LLL / / JIMyVfyMlu ll Fig.Z Bb PhilL fi9.5 (.6