Abstract
The paper discusses the problem of drying electric motors in a humid environment. The study considers the influence of oven, current, electroosmotic, convective-electroosmotic drying methods on defect formation in electrical insulating materials of electric motors. Thermal oven drying destroys the insulation system of electric motors for an order of magnitude higher than other methods and has a lot of negative consequences. The electroosmotic and convective-electroosmotic drying processes do not have disadvantages of thermal drying methods, or these disadvantages are kept to a minimum. It is shown that electroosmotic and convective-electroosmotic drying result in a uniform distribution of moisture content in the volume of electrical insulating materials. This reduces the likelihood of dangerous stresses and subsequent cracking. Electroosmotic and convective-electroosmotic drying have little effect on defect formation processes in the insulation system of electric motors and, thus, almost do not reduce the service life of electric motors.
Highlights
One of the main reasons for failure of electric motors is moisturization of winding insulation
In the agro-industrial complex the electric motors can be often exposed to water or disinfectant solutions, and drying of windings should be performed in a shorter period
It is explained by the impossibility of the existence of such electrical insulating materials, and by the fact that any material, undergoing vibration and thermal destruction during the operation of electric motors, ages over time and begins to moisten
Summary
One of the main reasons for failure of electric motors is moisturization of winding insulation. For the same humidity and temperature of 0 °C this time period increases to 18-20 days [8]. In the agro-industrial complex the electric motors can be often exposed to water or disinfectant solutions, and drying of windings should be performed in a shorter period. There is no fundamental possibility to create an electric motor winding with absolute moisture resistance. It is explained by the impossibility of the existence of such electrical insulating materials, and by the fact that any material, undergoing vibration and thermal destruction during the operation of electric motors, ages over time and begins to moisten. The problem of drying and moisture protection of electric motors will be relevant in the foreseeable future and effective means will be required to solve it
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