bdtronic has experience with all current impregnation resins.
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Impregnation resins
There are different impregnating resins on the market based on Epoxy resins (EP), unsaturated Polyester and polyesterimides or silicones with different characteristics. bdtronic can process all these materials in its state-of-the-art impregnation machines.
Impregnation as secondary insulation
Impregnation is also known as secondary insulation because it reinforces the copper enamel that is defined as the first insulation. It is a chemical procedure that uses coating substances, such as resins and varnishes, plus heat, through a variety of methods, necessary to fix and improve the mechanical, electrical and thermal performances.
Overview impregnation resins
Epoxies
Epoxy resins, also known as polyepoxides, are a class of reactive prepolymers and polymers, which contain epoxide groups.
Typical characteristics:
- With or without solvents (e.g. for high-voltage applications)
- Relatively high viscosity
- Good adhesion
- High mechanical resistance properties
- High chemical and moisture resistence
- Typically low aging properties at higher temperatures than polyesterimide resins
Polyesters / Unsaturated Polyesters
- Typically thinned in monomers (unsaturated polyester UP) or solvents (saturated polyester PE)
- Highly reactive & simple handling
- Medium adhesion & mechanical (brittleness) thermal class F-H
Silicones
- High temperature resistance
- Class C use in traction motors
- Some weaknesses in chemical and mechanical resistance
By using impregnation systems, manufacturers of automotive and electrical components are able to achieve improvements in the production and the repairs of these components. The choice of the correct material influences significantly the quality of the product and the final performances of the motor.
The choice is based on several factors that depend on the requirements of the product:
- Mechanical strength at high temperatures
- Heat transfer
- Replacement of the air in the insulating system
- Electrical insulation
- Thermal and environmental resistance
- Motor performance
- Resistance to mechanical shock and vibration
- Reduction of noise
The geometry of the product and of the copper wire/bar also influences the choice of the material having a direct impact on the ability of the resin to flow. Another parameter to be taken into account is the chemical and mechanical compatibility (adhesion) between the material and the primary insulation. Our technology center impegnation is glad to help its customers in the choice of the best material in combination with the final product and an optimized production process.
Technology Center
Together we can move forward – benefit from our expertise and many years of experience in dispensing technology at our Technology Center. bdtronic brings together specialists with comprehensive knowledge of component and production optimization. Work with us, the leading dispensing equipment manufacturer, to develop the optimal dispensing process for your requirements. Our interdisciplinary team from various specialist disciplines – from chemists with doctorates to engineers and plant mechatronics engineers – works on your applications in our Technology Center.
More than 20 experts in dispensing technology determine the appropriate process parameters in application tests – from prototypes to original components. We produce A, B, and C samples using our in-house technology. We also know the material manufacturers and work closely with them to incorporate further expertise. After extensive testing, we make well-founded recommendations and provide you with a detailed test report containing all the parameters tested.
