Encapsulating of electrical windings in Italvibras electric vibrators
Electric vibrators normally operate in conditions with intense mechanical stress, which puts all of its components to the test. The electrical winding is one of the most stressed parts, for both the electro-dynamical stress induced by the electromagnetic field and mechanical vibrations. Italvibras, coherently to its mission to exclusively produce industrial electrical vibrators, has targeted large resources to the search for quality, establishing accurate controls of the entire production process and therefore also the production of the electrical winding. The winding is realised with copper wires enamelled with three layers of insulation which, even in the smallest motors, are extremely fine. 100% of the electric vibrators produced by Italvibras undergo severe resistance, isolation and dielectric strength tests, both during and at the end of the production process, to guarantee the features of the electrical winding.
Vacuum encapsulation and drop-by-drop impregnation
Italvibras has adopted two innovative and very reliable systems for the impregnation of the windings, with a guarantee of total product reliability: the vacuum encapsulating system for small and medium-size vibrators and the "drop-by-drop" impregnation system for medium and large-size vibrators. The vacuum encapsulating system of the vibrator electrical winding is Italvibras' response to the breakage risk of electrical windings and provides a guarantee for them.
The vacuum encapsulating system consists in the consolidation of the casing and electrical winding using a special isolating resin in hard vacuum conditions. Thanks to this system the winding is completely impregnated with resin and forms a unique unit with the casing. During the past years the total encapsulating system has demonstrated excellent isolation features, which are also maintained through time. The application of this technology to small and medium-size vibrators is fundamental and inevitable for all companies that require great product reliability, preventing short-circuit risks of the winding and guaranteeing resistance even in the most arduous uses (high temperatures, formation of internal condensation, etc). Total encapsulation of the winding takes place on all Italvibras vibrators up to size 35 and on some other larger vibrators using special applications.
In all large vibrators the winding is impregnated using the special "drop-by-drop" system. This system guarantees the best electrical isolation possible on the medium-size and large electrical vibrators in all working conditions. The “drop-by-drop” system is realised using a state-of-the-art automatic computerised plant, which allows constant quality on all treated vibrators.