Self Supporting or Bobbin Wound Dry Coils:
- Usually used in low volume where a stock bobbin is not available
- Wound on a mandrel
- No available room for a bobbin
- Depending upon configuration, wire size and number of turns, the coil may require “bondable” magnet wire – the layers of wire are bonded together by heat, chemical or electrical bonding
- Could be used in very high volume- over 300,000 /yr where specialized winding and material handling would assist in automation
Bobbin and/or Tube Wound Coils:
- Higher insulation value from magnetic frame-core
- Lower material handling risk-damage to magnet wire
- Better platform for providing varistors, diodes and strain relief between the magnet wire and lead wire
Coils Vacuum Impregnated with Varnish:
- Proven method for moisture resistance and reducing vibration impact
- Varnish is pulled in to the center of the coil at –27”–29” Hg
