NOTE: Any type can be altered to meet individual customer requirements.
2300 VOLT DIP & BAKE
The loops consist of firm or DDG wire with second turn sleeving at the knuckles. The loops are then dipped in VRI 7057 adhesive glue and put in the oven at a low temperature to dry. When the loops come out of the oven, they are pressed in the height and width before they are spread, using a .006 mica wrapper, with a minimum of four and a half wraps in the slot for 2300 volts. On the end, we use two layers of half lapped mica. The mica used on standard dip & bake coils is VRI 77956 or ISOVOLTA 1961-06. Armour tape is .005 glass tape, one half lap on the ends and one-third lap through the slots. The leads are single sleeved with Grade A sleeving. The coil is then dipped in Westinghouse B535-5 Varnish and baked until dry. The coil is then surge tested at 350 volts/turn.
4160 VOLT DIP & BAKE
For the 4160 volt materials are the same. We use a minimum of six and a half wraps through the slot and three one half laps on the ends. The leads are double sleeved.
2300 VOLT VPI
Loops are done the same as dip & bake coil. Insulating materials are VRI 77877 or Samica 4373. We use felt lead seals and the leads can be taped or sleeved with acrylic overbraid. The Armour tape is untreated Glass tape or Dacron tape. The coil is tested and shipped raw.
4160 VOLT VPI
4160 volt coils are done the same but the amount of layers is increased to six and a half wraps and three layers on the ends. Note some customers prefer not to have wrapper on VPI coils. In this case, we build the slot section with mica tape.
All procedures are the same as a standard dip & bake coil. The only thing changed is the insulating materials. We use Isomica 4351-5 mica tape and wrapper and class H sleeving.
All procedures and materials are the same as standard dip & bake coils except the Armour tape. We use Resi-Flex and we use a high temperature silicone lead seal where the leads exit the coil.
6600 VOLT COILS VPI
For VPI coils, Mica 4373 is wrapped continuously around the coil three times. Then, through the slot section, we put a wrapper of the same material two and a half wraps. After that is complete, we put one more final wrap of 4373 around the coil. Armour tape may be Dacron or Glass (.005).
For DIP & BAKE coils, the Mica is 1961-06 Isovolta. Armour tape is Glass tape (.005) and a corona shield is either painted on or taped on the slot section.
COILS SUPPLIED FOR WATER SUBMERGENCE TEST
These are done as VPI coils with taped leads and Dacron felt lead seals. Armour tape may be Dacron or Glass (.005) depending on our Customers Preference.
RESIGN RICH SYSTEM
Loops are prepared and spread as explained in all coil systems. Samica 4800-7 resign rich tape is applied to entire coil. The laps applied will be determined by the voltage of the motor. Leads are also taped. Armour tape is Fusa-Flex or Resi-Flex. The coil is installed in the motor in an uncured state. After the motor is wound and connected, the winding will be cured in the oven for a specified cured cycle.