Today’s very strict competition force manufacturers to keep their productivity with minimum downtimes. At this point ARS supports customers by doing rewind of rotating machine at customers’ site through experienced winders and engineers.
Rewind at site starts first inspection to determine required windings and winding materials. After transporting these materials, ARS send its experts and equipment to carry out rewind at site. When customer leaves machine to ARS at their own workshop rewind work start sometimes with contribution of end user. Oven mostly supplied by end users and in the case of lack ARS use special tent and heaters to dry windings.
ARS experts remove old coil, clean and test core then install new coils, a dielectric strength test is applied for individual coils (2xUn+1 kV AC) After completion of connections done by silver soldering final electrical tests are executed. After preheating varnish is applied and stator/rotor dries in oven then machine is ready for assembly and run
One of the biggest advantages of rewind at site are cost and time for the customers.
Preparation of coil data sheet before execution of rewind at site
Stripped overhang insulation is renewed to keep machine in operation until convenient rewind time for the customer.
Manufacturing new coils
Dismantling of old coils
Cutting of overhangs
Removing of old coils
Core repair (if necessary)
After core recovery final ring flux test preparations
Thermal graphs during ring flux test
Coil geometric appropriateness checks
Slot wedge checks
Oven for drying purpose
Assembly of new coils
Applied coil dielectric strength test for individual coils (2UN+1kV)
Fixing of overhangs to support ring
Serial connection of coil leads
Completion of rewind and applying varnish
Ready for assembly