In the new paint and the old paint, we found an importa […]
In the new paint and the old paint, we found an important structural principle, which is reflected to some extent in all types: the chemical composition of the oillacquer oil component of the resin composition. Winding stick together. This is useful, for example, in a coil where the coil must have a rigid form without support, such as a deflection yoke in a television picture tube. However, in the following we will forget about this thermoplastic paint and only discuss the true insulation and must therefore meet the conditions for the formation of three-dimensional networks of the above molecules.
The second requirement is that the network in question must firmly adhere to the copper enameled wire. This can be explained as follows. Of course, the enamel layer on the enameled wire used to wind the coil should be able to accommodate the strain caused by the winding process without breaking. Copper core itself can meet this demand, as long as it is correct. Now experiments show that a "loose" enamel film can hardly adapt to any strain. But in the enamel to produce local contraction, leading to rupture.
However, if there is a balance of molecular networks between more flexible components and more rigid components. The first here represents a dry oil of long chain linear carbon chains, the second being a resin whose molecules contain a large number of rings. If the network of molecules in question is formed only of flexible components, as in, for example, rubber, we obtain a very flexible product, but its disadvantage is that it is soft and can easily swell in many solvents: the molecules of the latter are easily permeable To "open" the network and inflate it. On the other hand, if the network consists of rigid components only, the result is a hard and brittle substance.
The combination of resin and drying oil actually used is exactly what is needed for the enameled wire to have excellent properties for winding the coil: enamelled wire combines good flexibility with considerable resistance to mechanical and chemical effects. Now that we have learned some general structural principles, we can show how the individual properties of certain types of enameled wires can be understood as their structural background.