Impregnation methods


Impregnation technology

Impregnation methods

The right process for every application

To achieve the best results, a different impregnation method may be considered depending on the component.  The shape and size of the stator or rotor are among the special features that are taken into account. Whether trickling, roll dipping, hot dipping, vertical dipping or full stator impregnation - bdtronic knows the advantages of the different impregnation methods and advises you on the selection of the appropriate method.

Impregnation methods


bdtronic is the market leader for trickling impregnation of electric motors. A clean and effective method suitable for stators or rotors.

Roll dipping

The roll dipping impregnation process can be used for both rotors and stators. In this process, the components are only partially immersed and rotated in a controlled manner until the desired depth is reached.

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.

Contact our sales team for more information. Together we will find the right impregnation process for your application.
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