A transformer coil is produced by forming a sheet of composite material over a plurality of annular shaped support plates to form an inner layer. A coil is wound around the inner layer. An outer layer is formed by wrapping a sheet of composite material over the coil. The outer layer is mechanically attached...http://www.google.es/patents/US6930579?utm_source=gb-gplus-sharePatente US6930579 - Low voltage composite mold
