Our new automated epoxy unbalance correction system provides superior accuracy and short cycle times for rotors such as motor armatures, fans and blower assemblies. The new system applies the exact amount  of material required and uses an exclusive UV hardening epoxy resin to provide fast, accurate mass correction. The system offers a new  alternative to manufacturers that are presently using manual weight addition methods and milling or drilling correction.

In applications such as motor armatures and cooling fans, the unbalance of the rotor cannot be corrected by removal of mass without negatively affecting the physical properties of the rotor. Many of these applications are therefore still balanced manually by applying plasticine or correction weights such as clips. For both applications, reliability becomes an issue and falls short of the high quality standards set by the manufacturers for their products.

The new epoxy unbalance correction system jointly developed by Schenck RoTec and Epple now enables unbalance correction on a variety of sensitive parts to be automated, leading to a significant improvement in process reliability. The unbalance measuring instrument transmits the magnitude    and angular position of unbalance to the correction station. After the rotor has been indexed to the correction position, the resin, which was specially developed for this process, is applied to the rotor with an accuracy of a few milligrams. UV light is directed at the epoxy resin with high accura­cy through an optical fiber cable – causing the resin to harden within a period of 3 to 5 seconds The rotor can then be indexed to the second correction position, or removed from the machine for the next process step.

The automation of the sequence of operations means that the user no longer has to handle the 2-component bal­ancing plasticine, and enables strict occupational sa­fety requirements to be met. The ma­te­rial is free from solvents, therefore no special pre­cautions are required when handling the epoxy resin. The mate­rial has a shelf life up to 6 months and offers su­perior chemical and mechanical stability, high re­sis­tance to creepage currents and outstanding thermal stability.

The unbalance correction system can be integrated easi­ly into semi or fully automatic balancing machines and can be customized to suit the specific application require­ments. The new process en­ables almost any armature or fan to be balanced with­out negative effects on their physical properties. The new balancing system offers enhanced process relia­bi­lity and enables a high degree of automation.

For more information, request brochure RE2059