Baked Varnish Wire – a Bonded Winding as a Quality Lever

Bake-varnish wire is enamel-insulated wire with an additional activatable layer that becomes adhesive when heated. The turns are thereby fixed in a bonded assembly.

Effect in Practice

• The winding becomes mechanically stable and moves considerably less
• Micro-movements between turns are reduced
• This primarily reduces macro-microphonic effects (the winding moves less) and increases “calm” during operation

Classification

With an otherwise identical design, a baked varnish coil is always better than the corresponding round wire coil without baked varnish, because it is bonded and therefore remains mechanically calmer.

Resin Soaking as an Alternative to Baked Varnish Wire

If no baked varnish wire is used, a resin soaking carried out under vacuum can take over the mechanical fixation. The resin penetrates the winding, reduces voids and degrees of freedom, and transforms the winding into a stable bonded assembly. The result: considerably less macro-microphony and an overall calmer, more precise operation of the coil.