Inno­va­ti­ve insu­la­ti­on tapes

The effi­ci­en­cy and ser­vice life of an electri­cal machi­ne depends to a lar­ge extent on the insu­la­ti­on sys­tem. In order to extract maxi­mum per­for­mance from this sys­tem, we rigo­rous­ly pur­sue a sys­tem approach.

Our com­pre­hen­si­ve port­fo­lio of insu­la­ting tapes ran­ges from mica-based con­duc­tor insu­la­ti­on to main insu­la­ti­on and coro­na pro­tec­tion with con­duc­ti­ve and semi-con­duc­ti­ve tapes.

In com­bi­na­ti­on with spe­ci­fi­cal­ly deve­lo­ped resin sys­tems, this results in high­ly resistant and dura­ble insu­la­ti­on sys­tems. The­se are ide­al­ly sui­ted to with­stand all electri­cal, mecha­ni­cal, ther­mal, and envi­ron­men­tal stres­ses occur­ring over the ent­i­re ser­vice life, thus gua­ran­te­eing safe, fault-free ope­ra­ti­on.

To gua­ran­tee the excel­lent qua­li­ty of our pro­ducts, we mas­ter the com­ple­te value chain from mica mining and resin deve­lo­p­ment on the raw mate­ri­al side to rea­dy-to-install win­ding com­pon­ents from our coil shop in India.

Our com­pre­hen­si­ve exper­ti­se for mate­ri­al, insu­la­ti­on sys­tem and coil enab­les us to con­ti­nuous­ly opti­mi­ze and deve­lop our sys­tem offering.

Pro­ducts & solutions

Electri­cal insulation

The task of the main wall insu­la­ti­on is to sepa­ra­te the coil or bar win­ding of the electri­cal machi­ne, which con­sists of indi­vi­du­al live con­duc­tors. For this pur­po­se, the mica tapes are wound onto the coils or bars in several lay­ers, eit­her manu­al­ly or by machine.

We are the pioneers of modern mica tapes for both the Resin Rich (RR) and Vacu­um Pres­su­re Imp­reg­na­ti­on (VPI) pro­ces­ses. Both pro­ces­ses pro­du­ce high qua­li­ty, cost effec­ti­ve main wall insu­la­ti­on with extre­me resis­tance to electri­cal dischar­ge, due to our pro­prie­ta­ry mica paper com­bi­ned with mecha­ni­cal­ly robust car­ri­er mate­ri­als and various resin systems.

While Resin Rich Sys­tems com­bi­ne the advan­ta­ge of low cos­ts with a high fle­xi­bi­li­ty in the ser­vice busi­ness for small and medi­um sized electri­cal machi­nes, VPI insu­la­ti­on sys­tems show their advan­ta­ges espe­cial­ly in high volu­me applications.

With both tech­no­lo­gies, the main wall insu­la­ti­on pro­du­ced with our sys­tems is cha­rac­te­ri­zed by the fol­lowing properties:

  • high dielectric strength
  • high par­ti­al dischar­ge resistance
  • wrink­le-free banding
  • sui­ta­ble for manu­al and machi­ne processing
  • full com­pa­ti­bi­li­ty with pre­de­fi­ned resin systems
  • app­li­ca­ble for con­ven­tio­nal and flat coil technologies

With Sami­ca­por®, Von Roll has deve­lo­ped a ran­ge of out­stan­ding vacu­um pres­su­re imp­reg­na­ting mica tapes (VPI) that are ful­ly com­pa­ti­ble with spe­cial­ly deve­lo­ped or pre­de­fi­ned resin systems.

Under the brand name Sami­ca­therm® we offer a com­pre­hen­si­ve ran­ge of Resin Rich (RR) tapes and sys­tems as the main wall insu­la­ti­on for both con­ven­tio­nal and hydro­sta­tic pres­sing processes.

Espe­cial­ly for the insu­la­ti­on of end-win­dings, we have deve­lo­ped mica tapes under the names Filosam® and Sami­caflex®, which ensu­re a cer­tain mecha­ni­cal fle­xi­bi­li­ty during instal­la­ti­on and operation.

Tar­ge­ted con­trol and dis­tri­bu­ti­on of electri­cal stres­ses wit­hin the electri­cal machi­ne are an essen­ti­al design com­po­nent of any high vol­ta­ge machi­ne to pre­vent dama­ge during high vol­ta­ge tes­ting and ope­ra­ti­on, and to ensu­re the ser­vice life of the ent­i­re insu­la­ti­on system.

Von Roll has deve­lo­ped con­duc­ti­ve and semi­con­duc­ti­ve tapes with dif­fe­rent con­trol cha­rac­te­ris­tics. Coro­na­Shield® C ser­ves as outer coro­na pro­tec­tion with con­stant resis­tance to pre­vent dischar­ges insi­de the sta­tor slot; Coro­na­Shield® SC as end win­ding coro­na pro­tec­tion with vol­ta­ge-depen­dent resis­tance for tar­ge­ted field con­trol at the slot exit.

The task of con­duc­tor insu­la­ti­on is to sepa­ra­te the indi­vi­du­al live con­duc­tors from each other. For this, our mica tapes are wound onto the con­duc­tor by machine.

Depen­ding on the app­li­ca­ti­on, our Sami­ca­film® pro­ducts con­sist of various com­bi­na­ti­ons of mica papers, car­ri­er films, and bon­d­ing resins matched to the app­li­ca­ti­on. The car­ri­er films are optio­nal­ly coated with a hot melt adhe­si­ve. The use of our Sami­ca­film® tapes as pre­fer­red con­duc­tor insu­la­ti­on for sta­tor and rotor coils offers the fol­lowing advantages:

  • very high par­ti­al dischar­ge resis­tance, espe­cial­ly under impul­se stres­ses and in con­ver­ter operation
  • lower insu­la­ti­on thickness
  • hig­her fle­xi­bi­li­ty and shor­ter deli­very times

The out­stan­ding ther­mal pro­per­ties of the non-com­bus­ti­ble mine­ral mica enab­le the use of mica tapes for fire-resistant cables in safe­ty-rele­vant buil­ding instal­la­ti­ons that save lives in the event of fire.

Our Cab­losam® mica tapes enjoy an excel­lent repu­ta­ti­on world­wi­de. They are spe­ci­fi­cal­ly desi­gned for our cus­to­mers’ taping tech­no­lo­gies and are the pre­fer­red choice for mee­ting strin­gent inter­na­tio­nal stan­dards. Cab­losam® tapes are also free of halo­gens and do not release toxic fumes.