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      1. C.P: Mr. Wu
        F T: 0512-66956915
        FDM: 0512-66930668-9602
        FAX: 0512-66930698-9602
        EMAIL: wuxiaomin@szyongjie-motor.com

        Impregnation of motor windings

        Author:yongjie Comefrom:Original Date:2017-4-7 10:22:21 Hits:804

        Motor (English: Electric machinery, commonly known as "motor") is based on the law of electromagnetic induction to achieve energy conversion or transmission of an electromagnetic device.

        In the circuit with the letter M (old standard with D) said. Its main role is to produce the drive torque, as a power source for electrical appliances or various machines. The generator is indicated by the letter G in the circuit. Its main role is the use of mechanical energy into electricity, the most commonly used is the use of heat, water and other power generators to promote power generation.

        First, the purpose of the motor winding dip paint drying

        The purpose of the vacuum winding of the motor winding is to remove the moisture contained in the insulating material and fill all the air gap with the insulating paint so as to improve the insulation strength and moisture resistance of the winding and improve the heat resistance of the winding And heat dissipation, but also improve the mechanical properties of winding insulation, chemical stability, thermal conductivity and cooling effect and delay aging, the quality of motor diamonds is good or bad, directly affect the motor temperature and service life. Requirements of dipping and drying in strict accordance with the insulation treatment process to ensure that the permeability of the insulating paint is good, the film surface smooth and high mechanical strength. So that the stator winding bonding into a solid whole.

        At present, E, B-class insulation of the motor stator winding dipping treatment, the general use of 1032 melamine alkyd resin paint, the solvent is toluene or xylene, dipping times for the second, will be collectively referred to as universal secondary immersion hot immersion art.

        Second, the motor winding dip paint drying process

        The process consists of pre-drying, dipping two main processes.

        Prebb

        1) pre-baked

        Winding in the dipping before the first pre-bake, is to remove the moisture in the winding and improve the temperature of the workpiece dipping to improve the quality of paint and paint penetration.

        2) pre-bake method

        Pre-baking heating to gradually increase the temperature rise rate of not more than 20-30 degrees / h is appropriate. Pre-baking temperature as the insulation level to be set, the E-class insulation should be controlled at 120 ~ 125 degrees, B-class insulation should reach 125 ~ 130 degrees, at this temperature for 4 to 6 hours, and then pre-bake the cooling 60 ~ 80 degrees began to dip paint.

        2. Impregnation

        Dip paint should pay attention to the workpiece temperature, dipping viscosity and dipping time and other issues.

        If the temperature of the workpiece is too high, the solvent in the paint is rapidly volatilized, so that the film is formed on the surface of the winding, and it is not easy to penetrate into the inner part of the winding. If the temperature is too low, it will lose the pre-baking effect. Of the viscosity increases, poor mobility and permeability, but also make the paint effect is not good. Practice has proved that the workpiece temperature in the 60 ~ 80 degree dipping is appropriate.

        Paint viscosity: paint the viscosity of the choice should be appropriate, the first time when the paint is soaked in the paint soaked inside the winding, so the paint is better mobility, so the viscosity of the paint should be low, generally desirable 22 ~ 26s (20 degrees, 4 viscometer); the second dipping, the main hope in the winding surface to form a better layer of paint, so the viscosity of the paint should be larger, generally take 30 ~ 38s is appropriate. As the paint temperature on the viscosity of a great, so the general provisions of 20 degrees as a benchmark, so the viscosity should be measured according to the temperature of the paint to make appropriate adjustments.

        Dip time: Dip time selection principle: the first dipping, hope that the paint can try to soak into the winding, so the damping time should be longer, about 15 ~ 20min second dipping, mainly to form a better Surface paint, so the damping time should be shorter, so as not to be too long but will damage the film, it is about 10 ~ 15min is appropriate. But must be soaked, has been soaked until the bubble so far, if not appropriate to extend the dipping time. After each paint is completed, the stator winding should be placed vertically, dripping dry paint, the time should be 30min, and other parts of the paint with the solvent wipe.

        Third, dipping method

        The main methods of dipping are: pouring, immersion, vacuum pressure dip.

        For a single repair of the motor dipping, the use of more than the use of immersion, and immersion and vacuum pressure dip is usually used in the manufacture of motor, the bulk can be considered immersion, high voltage motor was vacuum pressure dip.

        Commonly used diving process is: take out the pre-bake motor, until the temperature cool to 60 ~ 80 degrees, vertical frame in the lacquer above; will be solvent-free paint into the empty beverage plastic bottles, in order to grasp the amount of dipping ; Holding a plastic bottle with insulating paint, oblique bottle mouth to make the insulating paint out of the bottle was linear, from the top of the winding pouring insulation paint, so that the paint in the coil through the bottom of the winding and then return to the lacquer plate; When the dripping paint is stopped for about 20 to 30 minutes, the motor stator is turned over, and the insulating paint is poured into the upper end of the winding (the original lower end) until infiltration is reached; and after about 30 minutes, the cloth is dipped in kerosene, And the drying of the remaining paint on the base, and then drying; for secondary dipping, after drying out to cool to 60 to 80 degrees and then the second dip, the same operation.

        Fourth, vacuum pressure dipping (referred to as: VPI) insulation process

        VPI-vacuum pressure impregnation process is to pre-bake the workpiece after the tide after cooling, placed in a vacuum environment, excluding the white billet inside the air and volatiles, relying on vacuum in the lacquering fluid gravity and coil capillary action, and the use of dry compressed air or inert gas, the lifting of the vacuum after the immersion paint applied a certain role in the pressure, so that the rapid penetration of paint and filled with insulation structure of the inner layer. In the country, the current VPI is still a gap operation of the insulation process. The drying process of the workpiece is carried out in the lacquered tank. The drying process is usually carried out in the form of a container or an oven. The vacuum drying process is carried out by drying or drying at atmospheric pressure.

        Comparison: Obviously, VPI is superior to other dipping processes in terms of lacquer penetration and impregnation. In the application, VPI is more suitable for large high-voltage coil, multi-layer winding yoke coil and require a large large winding, and other high-voltage coil. In theory, VPI applications, vacuum and pressure can be done quite high, of course, the cost is high. FGH is not, because of continuous operations, as well as the specific requirements of production and cost, its application has a certain range of restrictions.

        In the application test and the actual work, we found that the vacuum environment for a temperature condition of a dipping paint, when its vacuum is lower than the value of an absolute pressure, that is, to achieve a corresponding "critical" Vacuum, it will lead to a large number of foam in the impregnated liquid and a large number of liquid mist generation, that is, "bubble" and "atomization" phenomenon. "Foaming" caused a lot of holes in the paint, will hinder the infiltration. "Atomization" causes a large amount of solvent or diluent to escape, will affect the curing.

        For pressure, in principle, the pressure is to make the paint more easily into the filling gap, the paint process actually has an atmospheric pressure. If the wettability of the capillary in the insulating structure is balanced, increasing the pressure does not have a significant effect on the filling of the entire insulating structure, unless the increased pressure is maintained at the time of curing, the effective way to increase the filling is to reduce the viscosity of the paint and Reduce the insulation structure of the gap, improve the capillary effect, rather than increase the pressure. According to the "viscosity and pressure on the penetration rate" of the test, the data show that: when the viscosity of the larger paint, the increase in pressure on the filling speed has a greater role in the viscosity of the paint when the increase in pressure on the filling speed of the role is not Significantly. However, the viscosity of the paint solution has a very significant effect on the filling speed, the two were inversely proportional relationship.

        Thus, in the VPI process applications, one-sided emphasis and simple pursuit of high vacuum or high pressure, is blind and useless. The result will affect the impregnation efficiency and even damage the impregnation quality.

        A process for different insulation structure and different technical requirements, the actual process parameters are also different. For example, VPI has four process parameters, namely vacuum Vi, pressure Pi, temperature Ti, time ti, where i is 1, 2, 3, ..., n (n is the total number of VP process steps, i is the order). Insulation structure (W), technical index (A), paint characteristics (E) is the basic function of these four parameters of the elements.

        Fifth, the motor, transformer winding impregnation insulation treatment process

        From immersion, that is, ordinary dipping to multiple impregnation, and to the drop paint, roll dip and vacuum impregnation, vacuum pressure impregnation to the process of continuous continuous immersion, drop paint and roll soaking, and finally to vacuum impregnation drying integration, the formation of A series of a variety of mechanized continuous operation, the application of modern computer technology and PLC technology automatic control of the impregnation process, which is constantly through technological innovation, production needs and social development, and gradually evolve, it is this push, and produce A new generation of vacuum immersion paint dryer, energy saving, environmental protection into one of the high-tech products, brand-name products, nearly 600 users at home and abroad to use.

        A new generation of vacuum immersion paint dryer is the workpiece into the dip dryer pre-bake, in a vacuum environment to exclude the air inside the coil and volatile matter, and then under the vacuum conditions to rely on the lacquer gravity and coil capillary action, vacuum varnish , So that the rapid penetration of paint and filled with insulation structure of the inner layer of a mechanical operation of the insulation process.

        Process: into the workpiece → white pre-bake → vacuum dehumidification → vacuum leaching paint → back paint → drop paint → cleaning → back to the cleaning agent → low temperature drying to high temperature curing → insulation → baked the whole process, sealed no environmental pollution Sex is done.

        Advantages: In the scope of application of the process, the main advantages of its role in the following areas:

        1) to improve the integrity of the insulating varnish so that the insulating paint is almost completely filled with insulation, to strengthen the integrity of the entire winding, the winding in the operation of the various parts will not move alone, reducing the movement caused by wear and tear.

        2) to improve the environmental conditions, due to vacuum impregnation, the entire dipping process, including paint and varnish drying, are completely sealed containers under the conditions and the completion of the entire drying process using hot air circulation heating, the resulting exhaust through the A , B two groups of condenser recycling and re-discharge, improve the working environment, in line with environmental requirements.

        3) to reduce the operating temperature and temperature rise, due to vacuum impregnation and drying into a fully filled, a good alternative to the internal air gap, improve the thermal conductivity of the motor, the transformer can generally reduce 5-10 ℃.

        4) to improve the performance of the workpiece, due to vacuum impregnation paint the entire winding was impregnated paint tightly sealed, soaked, the surface of the film smooth and glossy, so that pollutants, moisture and chemical gases can not enter the inner layer, eliminating the conductive medium bridge Caused by the failure.

        5) to save energy and reduce costs, due to vacuum dipping, drying into one, drying time than the oven shortened by two-fifths, drying temperature than the oven 10-20 ℃, to further increase production and reduce energy costs.


        ICP: 蘇ICP備14038574號-1 Technical support:RBWL

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