The current insulation materials are almost entirely synthetic. The yarns are enamelled with varnishes that safely admit the application of thinner layers than double cotton layers, and have dielectric strength several times greater than the ability to withstand increasingly high temperatures. Check here coupon codes Current asynchronous motors are based on the same physical principles of the motor built by tronchuras in 1888. The research looks at the improvement and reduction of the weight of the electric machine in relation to the power supplied. However the greatest technological advance is due to the development of electrical insulation.

The insulation of the wires with natural or artificial silk reduced the space occupied by the drivers by about 60%. The impregnation varnishes were based on natural resins, oils and solvents, with a maximum thermal capacity of 90º. The idea of ​​using a kind of enamel or varnish began in the United States. The insulation resistance of an engine or generator may change depending on its size or characteristics, helping to extend its service life, especially in engines that are under adverse operating conditions, such as impacts and strong vibrations observed in steel, railroad and automotive.