SU1261057A1 - Electric machine - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to increase the cooling efficiency and simplify the design. The electric machine contains a winding 1, the frontal parts of which, together with heat pipes, are filled with heat-conducting dielectric material 2. Condensation chambers 4 and evaporation chambers 3 are made in the form of two concentrically arranged toroids on each side, which are connected by radial tubes 5. frontal parts are involved, the cooling efficiency is increased, and since the two sides of the core are installed along one pipe encapsulated with the frontal parts, the design groves 2 Il. Od JV H Par.1

Description

The invention relates to electrical engineering, namely to the design of closed asynchronous electric machines with evaporative cooling.

The purpose of the invention is to increase the cooling efficiency and simplify the design.

FIG. 1 depicts an electric machine; FIG. 2 is a section A-A in FIG. 2

The machine contains a stator winding 15 whose frontal parts are filled into capsules with a heat-conducting dielectric material 2, for example, a mixture of epoxy compound with iron powder. Toroidal evaporation chambers 3 are embedded in these capsules. 4. Condensation toroidal chambers are located outside the body 5 of the machine. Both chambers are connected by tightly arranged tubes 6, passing through the machine casing. Inside the evaporation chamber 3 and condensation 4, as well as the tubes 6 connecting them, are lined with a capillary-porous mass 7.

In order to cool the condensation chamber 4 and the machine body 5, an impeller 8 of the fan is mounted on the shaft.

The machine works as follows

When current flows through the stator winding 1, the latter heats up. In asynchronous machines of conventional design, the front ends of the stats windings are in the air gap. Due to the slight heat transfer into the air, the frontal parts are heated to the greatest extent.

In the case when the frontal parts of the stator windings are placed in the capsules, the efficiency of heat transfer to the blown body of the machine increases, but still remains insignificant.

In order to increase the cooling efficiency, evaporation chambers 3 are also placed in the stator winding capsules, filled with a heat-transfer fluid, such as distilled water, spit, acetone.

During operation, heat is supplied to the evaporation chamber 3 through the heat-conducting material of the capsule. The heat transfer fluid evaporates p and. flow

the vapor enters the condensation chamber 4 through the radial tubes 6. Ka-- the condensation measures 4 are cooled by the air flow supplied by the impeller 8

fan. When heat is removed in the condensation chamber 4, steam condensation occurs. The condensate is returned to the evaporative part 3 through the wick under the action of a capillary head.

 Thus, heat transfer is due to the latent heat of vaporization.

Refusal of orientation of heat pipes along the machine axis allows using the proposed evaporative-condensation cooling in machines of any size, including low-power ones.

Structurally and technologically, the machine is even more simplified, since

its assembly consists in installation from two sides of the stator winding through one heat pipe and encapsulation of the evaporators together with the frontal parts.

The cooling efficiency increases as the heat transfer involves front ends.

For normal operation, the evaporation-condensation cooling requires a small number of tubes connecting the evaporator to the condenser, practically one is enough. In addition, very small temperature differences are required for heat transfer in heat pipes.

Formula inventions

An electric machine comprising a housing, an external air blower, a core with a winding and heat pipes, the condensation chambers of which are located outside the housing and the evaporation chambers between the frontal winding parts and the housing, that, in order to increase cooling efficiency and simplification, the condensation and evaporation chambers are implemented in the form of two concentrically located toroids on each side of the core, connected by radially arranged tubes, and the evaporation chambers, together with the frontal parts s dielectric thermally conductive compound in the cap

suly.

Editor L. Veselovska

Order 5241/55 Circulation 631 Subscription

VNRSHPI State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Design,

FIG. 2

Compiled by L. Kartseva

Tehred L.Oleynik Proofreader (A.T.

Claims (1)

Claim An electric machine comprising a housing, an external blower, a core with a winding and heat pipes, condensation chambers of which are located outside the housing, and evaporation chambers between the frontal parts of the winding and the coil, characterized in that, in order to increase cooling efficiency and simplify, the condensation chambers and vaporization is made in the form of two concentrically arranged toroids on each side of the core, connected by radially arranged tubes, and the evaporation chamber together with the frontal parts are filled with dielectric richeskim heat-conducting compound in capsules. 1201057 A “A