Dip-and-Spin Systems (Electric Motors)

3.16.2
The dip-and-spin method is typically used to apply varnish to motor stators. The stator is hung from a hook or is set on a pallet with the bore up, and is then submerged in varnish. After dipping or submerging in varnish, the part is allowed to drain. After a short drain time, the stator is spun about its bore axis to remove excess varnish. The type of varnish used is normally mixed at a low viscosity, allowing only a thin film of varnish to be left on the part after spinning. Corrosion resistance and bonding of the lamination are reasons to use this type of varnishing system.
Dip-and-spin systems are often utilized in the processing of hermetic motors or motors that see a wet environment, such as pool pumps. In such cases a varnish coating over the entire core and coil is crucial.
A palletized conveying system can also be used. The parts are loaded on a pallet that is pushed or conveyed through a continuous oven. The pallets serve a dual purpose of supporting the parts and containing spilled varnish.
The heating and conveying process for the dip-and-spin method may be the same as for the conventional dip system.