SU1520630A1 - Rotor of electrical machine with evaporative cooling - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is the intensification of heat transfer in the evaporation zone. The rotor of the electric machine contains a shaft-heat pipe 2, in which a cylindrical insert is fixed in the area of the rotor package 1. Due to the fact that the insert 4 is made in the form of a continuous ferromagnetic material with protrusions 5 on the side surface and channels 6 between them, the achievement of the goal is achieved. 3 il.

Description

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The invention relates to the design of electric machines with evaporative cooling of the rotor and can be used, for example, in asynchronous motors with an increased 1m slip.

The purpose of the invention is the intensification of heat transfer in the evaporation zone.

Fig. 1 depicts a rotor from a tagging into channels in the evaporation zone 3. Due to the fact that, when boiling during boiling, heat transfer occurs through a very thin layer of heat transfer medium, its intensity increases many times over. At the time of the start of the machine, when the rotor slip reaches 100%, in a massive insert of ferromagnetic

A long tube in the shaft, a longitudinal paspesjj material, generates a lot of heat, in FIGS. 2 and 3 a heat pipe with inserts of different designs, a cross section.

The rotor consists of a package 1 of the rotor, a heat pipe 2, and a massive insert 4 of a ferromagnetic material reinforced in the entire evaporation zone 3 of the heat pipe. On the lateral surface of the massive insert, longitudinal or screw protrusions 5 are made, nearing the inner surface of the heat pipe, and the channels 6 located between them. The projections 5 and channels 6 can be made on the side surface of the insert by pressing. The insert 25 4 can be made in the form of a polyhedron (Fig. 3), and the channels 6 have the form of segments formed by the faces of the massive insert 4 and the side wall of the pipe 2.

When an electric machine is in operation, heat released in the rotor heats the walls of the heat pipe 2, the intermediate heat carrier located here, for example acetone, evaporates into

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In this case, a very thin layer of heat-transfer agent remains on the channel walls, which, by evaporation, intensively removes heat from the pipe walls. The resulting steam is transferred to a cooled condenser 7 and is condensed, releasing heat to its walls. The condensate produced by centrifugal forces, which appear when the rotor rotates, returns 35

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At these moments, heat is supplied to the coolant in the channels not only from the side of the pipe wall, but also from the side of the massive insert. As a result, the surface area of the heat transfer increases approximately twice and the amount of heat removed accordingly.

The magnetic flux created in the rotor by a rotating magnetic field passes through a massive insert 4 made of ferromagnetic material, the resistance to the magnetic flux decreases and the power factor of the machine increases accordingly,

The proposed technical solution is used in asynchronous motors with proper slip and evaporative cooling of the rotor.

f o ploma

The rotor of an electric machine with evaporative cooling: containing a hollow shaft made in the form of a heat pipe with evaporation and condensation zones, in the cavity of which a cylindrical insert is fixed in the region of the rotor package,

that, in order to intensify heat exchange in the evaporation zone, the insert is made in the form of a solid massive body made of ferromagnetic material with BWcrynat and a side surface, which is attached to the inner surface of the heat pipe, and longitudinal channels between them.

This material generates a lot of heat.

At these moments, heat is supplied to the coolant in the channels not only from the side of the pipe wall, but also from the side of the massive insert. As a result, the surface area of heat transfer increases approximately twice and the amount of heat removed accordingly.

The magnetic flux created in the rotor by a rotating magnetic field passes through a massive insert 4 made of ferromagnetic material, the resistance to the magnetic flux decreases and the power factor of the machine increases accordingly,

The proposed technical solution is used in asynchronous motors with proper slip and evaporative cooling of the rotor.

f o ploma

The rotor of an electric machine with evaporative cooling: containing a hollow shaft, made in the form of a heat pipe with evaporation and condensation zones, in the cavity of which a cylindrical insert is fixed in the area of the rotor package, characterized by that.

that, in order to intensify heat transfer in the evaporation zone, the insert is made in the form of a solid massive body of ferromagnetic material with BWcrynat and side surfaces, which are attached to the internal surface of the heat pipe, and longitudinal channels between them.

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Claims (1)

The rotor of an electric machine with evaporative cooling, containing a hollow shaft made in the form of a heat pipe with zones of evaporation and condensation, in the cavity of which a cylindrical insert is fixed in the rotor package zone, characterized in that, in order to intensify heat transfer in the evaporation zone, the insert is made in the form a solid massive body of ferromagnetic material with protrusions on the side surface, when No. 1 is attached to the inner surface of the heat pipe, and longitudinal channels between them.