Isolamento de motores elétricos

Electric motor insulation

The electric motor is undoubtedly one of the most notorious inventions of human beings. It is a simple, versatile, low cost and non-polluting construction element. But despite all the benefit, it requires some specific care like the insulation of electric motors.

The history of the electric motor

The electric motor, as we know it today, was designed and tested by the German scientist Werver von Siemens in 1886 when he invented the first self-induced direct current generator.

But in fact, Siemens was the finisher of a study by a number of scientists that added up to nearly 300 years.

In the year 1600 the English scientist Wiliam Gilbert published a scientific study entitled De Magnete, which described the force of magnetic attraction.

In 1663, the first electrostatic machine was built by the German physicist Otto von Guericke and later – precisely in 1775 – perfected by the Swiss Matin Plant.

Shortly thereafter, in 1820, Danish physicist Hans Christian Oersted discovered that a compass pointer moved as it passed close to an electrical current conductor.

After this observation, Oersted realized the connection between magnetism and electricity, which would be the first step toward the development of the electric motor.

Five years later, in 1825, English shoemaker William Sturgeon, who was studying electricity in his spare time, invented the electromagnet, a key piece for the future of the electric motor.

In 1832, Italian scientist Salvatore Dal Negro built the first reciprocating AC machine. A year later the Englishman William Ritchie invented the commutator, building a small electric motor.

After that, some more scholars made new experiments and discoveries, until in 1886 Siemens refined the discoveries and experiments of its predecessors and built what we now know as the electric motor.

The importance of electric motor insulation

Electric motors that are used today are generally exposed to electronic systems for the purpose of higher efficiency.

This practice causes high frequency spikes, causing greater strain on the insulation material of the electric motor. This ultimately shortens its lifespan.

Due to this situation, the was developed with the main objective of improving the engine performance and also increasing the equipment life.

Class H 180 polyester consists of two layers of Du Point Brand Nomex paper and an inner layer of polyester film.

A product that combines the advantages of excellent thermal properties and tear strength, as well as excellent electrical and mechanical properties of polyester film.

Its use in motor insulation helps to prevent premature breakdowns causing equipment downtime.

In addition to tear resistance, class H 180 polyester does not soften or melt during small exposure to temperatures up to 300 ° C.

It is suitable for insulating grooves, transformers for better performance and also for insulating electric motors.

The use of insulating paper for electric motors makes it possible to perform various procedures in the motor structure, such as the isolation of phases, turns, conductors, poles, among others.

Geartech BR operates since 2001, importing and marketing a large quantity of electrical insulating products that have high quality and certification (ISO 9001) to industries and dealers throughout the country, always valuing the satisfaction of its customers and partners.


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