To facilitate the removal of the damaged windings, it is typical to cut
off one end of the coils before placing the unit in the roasting oven.
In addition to all nameplate data the dimensions and the shape of
the coil ends being cut off are measured and recorded.
The windings are prepared for removal from the core using a
controlled heat, roasting oven. For cast iron or steel frame motors
the core temperature does not exceed 650 degrees F.
When a stator is to be rewound, two core loss tests shall be made,
one before and one after passing through the roasting oven.
New coils are manufactured using only new copper wire of the
correct dimension and dielectric coating specification. They are then
inserted into the core, insulated in high temperature varnish, and
tested to assure quality.
