The history of the creation of the lucky wire:
A famous German legend tells that a German girl was able to weave gold with strings of mats and in this way achieved great wealth. This story is also sometimes true about the lacquered wire. In some cases, lacquered wire is more expensive and more important than gold. Almost in most cases, the application of lacquered wire is in the production of magnetic field.
In 1831, Faraday – an English physicist – discovered that a current is created or induced in a coil by moving a magnet inside it. He wrote in his diary on August 29, 1831 that he separated the layers of the coil with cloth strips. These bulky, hand-wrapped conductors were sufficient for testing, but unacceptable for commercial purposes.
In fact, since the beginning of the development of electrotechnics at the end of the last century, the wires that can be used in winding or the “magnet wire” have been of great importance. Accordingly, the word “magnet wire” (American term) seems more expressive than “winding wire” (English term). At that time, the conductors were insulated only by weaving cotton, paper or natural silk. Due to the high moisture absorption of these insulating materials, the prepared bobbin should be completely dried first and then inoculated several times with anti-humidity materials. Until 1900, winding wires were made entirely in the same way. Later, in order to reduce the volume of the bobbins and create more resistance to moisture, the wires were immersed in materials based on natural varnishes. Until 1915, these natural varnishes were mainly produced based on “bitumen” and “drying oils”. The introduction of wood oil created an important evolution in inoculating varnishes because the double bonds, one in the middle in its chemical structure, caused rapid polymerization of the varnish due to the absorption of oxygen against heat.
With the progress of science and in order to reduce the volume of bobbins and create resistance to moisture, wire insulation was produced based on linear polyamides that had high strength and flexibility. As a result, the insulation of the wires did not peel off due to wrapping.
Today, varnishing is done using a solvent method. In this method, local polymers are stretched in organic solvents on the bare wire with the desired thickness, and after the evaporation of the solvent, the film formed on the wire is polymerized, hardened and stabilized.
We already know that from the smallest electric motors to the most complex industrial tools and equipment, they have an inevitable and widespread dependence on lacquered wire, and basically any conversion of electrical power to mechanical and vice versa without using lacquered wire, which is the main element of creating a field Magnetic seems to be the problem. From this point of view, this product can be called a strategic product.
The most important metal that is used in the manufacture of lacquered wire conductors is copper. Nowadays, other metals such as aluminum, silver, etc. are also coated with electrically insulating varnish and they are used in special industries such as military industries, medical equipment, etc. The section of lacquered wire can also be round and flat. But the most common type of lacquered wire section is round.
There are different types of electrical insulators used in the manufacture of lacquered wire, which are classified according to thermal class. The thermal class indicates that during the use of the wire, its temperature should not exceed.
Insulating varnishes are usually in liquid form, which after being coated on the wire with special methods, are polymerized by heat in varnishing furnaces and stick to the surface of the wire in the form of a solid, polished and uniform coating. Varnish coating methods on wire are also done either by special molds or by felt, the latter of which is used for lacquered wire with diameters less than 20.0.
This post is written by kamalifard