Hybrid curing systems to improve machine resin impregnation efficiency
By J de Beer, Tectra Automation
Electricity+Control, November 2015 (pages 4 – 6)
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During the manufacturing of rotational machines such as electrical motors and alternators, the rotor is impregnated with a resin as secondary insulation. This resin impregnation is crucial to the performance of the rotational machine as it keeps the copper coils together when in operation up to 18 000 rpm. This prevents coils loosening owing to vibration and causing internal machine damage. Resin impregnation also increases the thermal conductivity of the rotor coil, thereby conducting heat away from the core while protecting the coil from water damage.
During curing of the impregnation resin, the curing time can be decreased using a number of curing methods. It is possible to use a number of different curing methods depending on the part, cycle time and preferred resin. This research focuses on the possibility of combining existing curing methods into a hybrid curing system in order to determine if decreased curing times, increased production rates and increased electrical efficiency can be achieved while the resin’s mechanical properties do not decrease.
- During the manufacturing of rotational machines, the rotor is impregnated with a resin as secondary insulation.
- Resin impregnation is crucial to the performance of the rotational machine.
- Resin impregnation increases the thermal conductivity of the rotor coil.