Heat-generating electromechanical converter

FIELD: electricity.

SUBSTANCE: invention relates to electric engineering, namely, to a heat-generating electromechanical converter designed for heating and/or movement of liquid or gaseous medium. The device comprises an additional fixed element made of antifriction non-electroconductive material, which performs the functions of a radial and/or thrust sliding bearing, from polymer composite material on the basis of epoxide-diane resin with filler from fluoroplastic powder, cut glass fibre and additionally aluminium oxide Al2O3 or silicon dioxide SiO2, which makes it possible to increase quantity of heat removed from the primary winding.

EFFECT: increased coefficient of heat conductivity of a fixed heat-insulating element provides for reduced temperature of primary winding of a heat-generating electromechanical converter, which accordingly increases reliability of its operation.

2 tbl

 

The invention relates to electrical engineering and can be used for industrial, agricultural and domestic use.

Known Electromechanical Converter comprising a primary winding, a magnetic core and a rotating squirrel-cage secondary winding in the form of a hollow cylinder, separated from the magnetic core additional insulating element of the antifriction elektroprovodyashchego material performs the function of a sliding bearing and constituting a single whole with a magnetic core and a primary winding, and on the inner surface of the secondary winding is formed and rigidly connected with it the pressure of the blade (the patent for useful model RF # 65335, IPC7NW 6/10, F25B 29/00).

The closest in technical essence is generating Electromechanical Converter comprising a primary winding, a magnetic core and a rotating squirrel-cage secondary winding, made in the form of a hollow cylinder, separated from the magnetic core additional insulating element of the antifriction elektroprovodyashchego material that performs the function of radial and/or thrust sliding bearing and constituting a single whole with a magnetic core and a primary winding, and on the inner surface of the secondary winding is formed and rigidly connected with it pressure lo the Asti, additional stationary heat insulating element consists of a polymer composite material based on epoxy resin with filler of PTFE powder-4 and chopped fiberglass, for example, when following a weight ratio of components: epoxy resin - 75...90%; PTFE - 4-8...24%; the rest is chopped glass fiber (patent RF №2410852, IPC NW 6/10, F25B 29/00, E21D 5/012).

The disadvantage of these devices is their low reliability, due to the intense thermal conditions of the primary winding.

The task of the invention is to improve the reliability of the device by improving the heat transfer between the winding and the cooling environment and reduce the heat load of the primary winding.

Technical result achieved in the process of solving the task, is to increase thermal conductivity of the material fixed additional heat insulation of the heat generating element of the Electromechanical Converter.

This technical result is a consequence of the use of additional fixed element of the antifriction elektroprovodyashchego material that performs the function of the radial and/or thrust sliding bearing, made of composite material based on epoxy-d is anovas resin with filler of PTFE powder, chopped fiberglass and aluminum oxide Al2O3or silicon dioxide SiO2that allows you to increase the conductivity of the composite material without reducing its electrical strength.

The essence of the invention is illustrated as follows.

Generating the Electromechanical transducer consists of a magnetic core with hosted network winding and a rotating squirrel-cage secondary winding, made in the form of a hollow cylinder, the inner surface of which is formed and rigidly connected with it the pressure of the blade. Rotating the secondary winding and the magnetic core are separated fixed additional insulating element of the antifriction elektroprovodyashchego material that performs the function of radial and/or thrust sliding bearing and which is integral with the magnetic core and the primary winding. Antifriction elektroprovodyashchie material consists of composite polymer based on epoxy resin with filler of PTFE powder, chopped fiberglass and aluminum oxide Al2O3(for example, in a weight ratio of: 75...85% of epoxy resin, 4...6% - fluoroplastic-4, 5...7% aluminum oxide Al2O3the rest is chopped fiberglass) or silicon dioxide SiO2(for example the EP, in a weight ratio of: 75...85% of epoxy resin, 4...6% - fluoroplastic-4, 6...12% silicon dioxide SiO2the rest is chopped fiberglass).

Table 1 provides examples of implementation of the composition used as the material fixed additional heat insulation of the heat generating element of the Electromechanical transducer with the inclusion of aluminum oxide, in table 2 - with the inclusion of silicon dioxide.

Table 1
The weight ratio of components using aluminium oxide
ComponentsI implementationII implementation
Epoxy resin85%75%
Fluoroplastic-44%6%
Aluminium oxide5%7%
Chopped fiberglassrestrest

T the blitz 2
The weight ratio of components when using silicon dioxide
ComponentsI implementationII implementation
Epoxy resin85%75%
Fluoroplastic-44%6%
Silicon dioxide6%12%
Chopped fiberglassrestrest

When this epoxy resin and chopped glass fibers provide high strength, low shrinkage, good adhesion, low water absorption, Teflon - high wear resistance, low friction coefficient, high electrical resistance, the aluminum oxide Al2O3or silicon dioxide SiO2- high thermal conductivity fixed additional insulating element. During operation of the heat generating Electromechanical transducer primary winding is the most intense in thermal relation to the item, because is inside additional C is movable partition insulating element made of composite material. The amount of thermal power transferred from the primary winding, is determined by thermal resistance of the fixed additional insulating element, dependent thermal conductivity utverzhdenii epoxy resin (0,064 ...0,216 W/(m·K)), PTFE (0.25 W/(m·K)), chopped glass fiber (0,030...0,050 W/(m·K)). The use of aluminum oxide Al2O3with a thermal conductivity of 25...30 W/(m·K) or silicon SiO2with a thermal conductivity of 1...7 W/(m·K)) leads to lower thermal resistance, respectively, to increase the amount of exhaust from the primary winding heat and reduce its temperature. Reducing the winding temperature for each 10...12 degrees leads to an increase in its service life is almost doubled, which leads to increased reliability of the heat generating Electromechanical Converter.

Thus, additional stationary insulating element representing a radial and/or thrust bearing, of the composition, for example, in a weight ratio of: 75...85% of epoxy resin, 4...6% PTFE, 5...7% aluminum oxide Al2O3or 6...12% silicon dioxide SiO2the rest is chopped glass fiber, can reduce heating of the primary winding and reliably to increase the th generating the Electromechanical Converter.

Generating Electromechanical Converter comprising a primary winding, a magnetic core and a rotating squirrel-cage secondary winding, made in the form of a hollow cylinder, separated from the magnetic core additional insulating element of the antifriction elektroprovodyashchego material that performs the function of radial and/or thrust sliding bearing and constituting a single whole with a magnetic core and a primary winding, and on the inner surface of the secondary winding is formed and rigidly connected with it the pressure of the blade, with additional stationary heat insulating element consists of a polymer composite material based on epoxy resin, PTFE and chopped glass fiber, characterized in that the composition of the material forming the additional insulating item included aluminum oxide Al2O35...7% or silicon dioxide SiO26...12%, while the remaining components are in the following weight ratio: epoxy resin - 75...85%, fluoroplastic-4 - 4...6%, the rest is chopped fiberglass.



 

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