This UV-hardening procedure, developed by the company Gottlob Thumm GmbH, can clearly reduce the VOC-emissions and the draining losses of the impregnation resin.

Within the production of big electric motors the stators are teemed with epoxy resin or with polyester resin. Normally, this impregnation takes place in the dip coating, afterwards the resin must cure comparatively long. The consequences: a high energy consumption and VOC-emissions from the resins.

In contrast to conventional methods, the new UV impregnation technology needs energy only during the impregnation or the hardening process. With the new procedure, the sheet metals are warmed up on a high-frequency level leading to a short heating-up time. This improves the flux through the copper winding of the impregnated stators. UV radiators provide the surface hardening of the resin, a reduction of the hardening times by up to 97 percent and a minimization of the VOC-emissions. Moreover, approximately 70 percent of energy can be saved. In first applications the procedure already proved impressively its advantages in the electric technology.