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The influence of paint on motor windings on the motor
source：未知 time：2024-07-12 09:33
For any motor product, the dipping and baking process is a very critical control link. For this process, it is mainly controlled by equipment, technology and process management. The purpose of dipping and baking the motor winding is to fill the insulating varnish into all the gaps inside the winding, and after drying, the winding becomes a solid whole to ensure that the insulation, heat dissipation and vibration performances meet the requirements during the operation of the motor, and meet and improve the overall performance level of the motor.
During the disassembly process of the motor with winding failure, it can be found that some windings are relatively loose, which obviously has a certain adverse effect on the performance of the motor. In order to achieve sufficient effective paint hanging amount for the motor winding, sufficient attention should be paid to the materials, process parameters and process control involved in the dipping and baking process.
The viscosity of the paint is very critical. If the paint is too thin, there will not be enough paint base in the winding to fill its gaps. If the paint is too thick, it will be difficult for the paint to enter the winding, especially the core slot. At present, many motor companies have adopted VPI vacuum pressure dipping equipment, which will make up for the unsuitability of some materials, but the effect is very limited. In the actual production process, the state of the dipping equipment and the viscosity of the paint must be dynamically monitored, otherwise it is difficult to achieve the expected effect.
In the winding insulation treatment process, most of the dipping and drying processes are carried out separately. Pre-baking before dipping is necessary to remove moisture and air in the winding. After the dipping is completed, the drying process is carried out. If the baking temperature is low, the paint that has entered the winding will quickly lose, and the insulation treatment effect will be greatly reduced. Of course, if the temperature is too high, it will cause aging and failure of materials such as electromagnetic wire and insulation.
For most drying processes, the winding is in a stationary state, which always leads to an uneven distribution of the insulating paint relative to the winding. This leads to a problem of the curing time of the insulating paint. If the time is too long, the unevenness of the insulation treatment will be greater. In order to improve the insulation treatment effect of the winding, some baking equipment has added a rotation processing function, that is, to ensure that the winding is in a rotating state during the drying process, and to effectively improve the uniformity of the insulating paint distribution in the winding.
From a theoretical analysis, it is better to have a larger amount of paint on the winding, that is, to meet the saturation of all filling gaps in the winding, but the effective filling effect is critical. If the paint is relatively viscous, you can see that there is a thick layer of paint on the winding end and the inner and outer circles of the core. There may also be very little paint entering the winding. From the data analysis of the amount of paint, the data is relatively good, but the insulation treatment effect is not ideal.
Whether it is a high-voltage motor or a low-voltage motor, the insulation treatment process is particularly critical, especially for high-voltage motors, which also involve coil winding and wrapping processes, which we will not go into here.
