Other impregnation methods
The traditionally used impregnation process is dipping. It is generally used for electric motors, generators and in the production of transformers. In this process, the parts are immersed in the dipping tanks filled with suitable impregnating resin. After a certain dripping period, the parts are placed in an oven for drying. This allows the wire winding and the center to become one solid and mechanically stable unit.
These methods have in common a relatively high resin consumption and the need for subsequent cleaning of the components. In addition, the dip tanks filled with several hundred liters of epoxy or polyester resin have to be emptied and cleaned regularly. These methods are not compatible with the current requirements for a sustainable and "green" production environment, and they also entail high operating costs.
Hot Dipping
This method applies impregnation by preheating the components in order to handle viscous impregnation media. Viscosity of resin and other sealing products may be reduced with preheated components, which allows higher levels of penetration. Low or none process monitoring achieved.
Vertical Dipping
The component is preheated and then fully dipped into the resin; the component is drained with a specific angle and then follows the rest of the process until the resin or varnish is sealed. Partial process monitoring achieved.
Stator full potting
A mold or base is prepared and receives a preheated component. After pouring the sealing product into the component, the mold is pressed; it is also possible to set the mold first and then inject the sealing product from below using a vacuum. This process ensures high quality of the final product and very high heat dissipation of the engine. Due to its complexity, this process has low productivity. Complete process control is achieved.
