Y series three-phase asynchronous motor dip coating process is an important production link that all motor manufacturers attach great importance to. After all, the quality level of dipping paint directly determines the intrinsic quality of the motor and is a necessary condition for extending the service life of the motor. Many motor friends think that it is not the problem of improving the quality of winding insulation treatment? But it is not easy to be able to do it well. Today, Dalan Motor Xiaobian talked with everyone about the amount of paint hanging on the motor windings.
The amount of lacquer is too low to achieve the purpose of winding insulation treatment; however, if the amount of lacquer is too high, the insulation treatment effect will be poor - in the production process, the cracking and bubbles of the lacquer layer will be accompanied, from the comprehensive economic benefit analysis, It will increase the consumption of paint and increase the cost of the product.
From the theoretical analysis of the heat conduction of the motor, or from the analysis of the curing mechanism of the impregnating varnish, the amount of winding paint can be decomposed into three parts: the amount of paint hanging in the winding, the amount of paint on the end winding and the paint film on the end winding surface.
In general, the higher the amount of paint in the winding slot, the better; the winding ends should be moderate, and the space between the enameled wires and the upper and lower layers should be filled, and the space formed by the winding between the adjacent grooves. It is better to not fill up; the paint film on the surface of the end winding is preferably thin. But how to do it right will involve many factors, different products, different materials, different processes will lead to different results.
Factors affecting the amount of paint:
Impregnating varnish
The specific gravity of different impregnating varnishes is different, and the specific gravity of the cured product formed by the cross-linking reaction of the curing system is different. Therefore, the weight of the solidified material filled in the gap of the same volume winding will be different, and the difference in the amount of winding paint will be shipped. Born.
Characteristics of the impregnating varnish itself
For different paints and different types of enameled wire, there are different paint lacquers. The thickness and weight of the paint film on the end surface of the winding are actually determined by the amount of paint lacquered by the immersion paint itself.
Structural part material
The structural parts of the winding insulation system are made of different materials, and the amount of immersion paint varies greatly. When the product is structurally designed, the size and number of structural parts of the motor winding insulation system are related to the change in the amount of paint.
product design
The groove full rate of the electromagnetic design directly determines the filling amount of the straight part of the winding. In addition to the core length and the groove structure size, the groove full rate is the main factor determining the amount of paint in the groove.
Manufacturing process
When the product is manufactured, the windings are of different types such as winding and winding, which will result in different end paint layers of the windings. In particular, the degree of tightness of the windings, the position at which the copper wires are arranged at the ends, also determines the amount of filling of the ends of the windings.
In summary, the core and key parts of the motor are windings and insulation. The amount of winding lacquer from the same batch of the same specification product will also vary greatly. For products with less paint, the temperature rise of the motor winding is relatively It is much higher; but in the same way, the high amount of lacquer alone does not necessarily guarantee the insulation effect of the winding. The suitability of the related factors such as paint, parts and environment is the key to process control.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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