Impregnation Technology

1. Trickling

Immagine di presentazione di Trickling

The Trickling method of Impregnation regarded as the most effective system for impregnating electrical windings, for rotors and stators alike. The parts are placed in a horizontal position on auto-centering Chucks. Using this equipment, which allows continuous rotation on the central axis, the parts are transported through the various phases of the process (preheating, impregnation, gelification, polymerisation and cooling). Depending on the geometry of the part and of the conditions required by the process, the rotation speed - which is an important component for the penetration of the impregnating resin into the slots- is electronically controlled along the whole process, particularly on the impregnation and gelification areas.
The impregnation station consists in one or more workstations equipped with a series of drippers, specifically positioned on the pieces so as to allow thorough the resin trickling the correct impregnation of the parts , and only where the resin deposing is necessary. The drippers are controlled in their movements by means of linear CC Low Voltage motors , or simply manually adjusted during the change of the sizes . The resin flows on the drippers by one or more automatic pumping groups. The accurate control of the operating parameters ( resin quantity , viscosity , parts rotation speed, temperatures and times) allows the system to apply the impregnating product optimally on the preheated parts by exploiting the principle of capillarity, ensuring perfect absorption and preventing unwanted surplus of resin dripping from the windings .
By keeping the part in constant rotation, both in the impregnation phase and in the subsequent gelation, the resin is distributed evenly on the whole winding of the stator getting high values of solid content after polymerization. The result is a perfectly impregnated winding only in those areas (slots, heads) avoiding after works to clean the packet surfaces . The Trickling system is commonly used in all those products in which, during regular operation, the thermodynamic stress is of most significant magnitude.

Icona per Trickling

Benefits

  • High impregnation quality
  • No post-impregnation after work activities required
  • Maximum filling of winding slots
  • High Bond Strength standards
  • Good resin penetration throughout the winding
  • Short processing times
  • High productivity
  • It is possible to use resins with or without monomers
  1. Ring Line
  2. Pilot Line
  3. U Line

2. Roll Dip

Immagine di presentazione di Roll Dip

The Roll Dip method of impregnation is indicated both for winding stators and rotors. The parts are placed in a horizontal position on auto-centering Chucks . Using these Chucks , which allow continuous rotation on the central axis, the parts are transported through the various stages of the process (preheating, impregnation, gelation, polymerization and cooling). Depending on the geometry of the part and of the conditions required by the process, the rotation speed - which is what causes effective penetration of the impregnating resin into the windings - is electronically controlled along the entire process, focussing particularly on the impregnation and gelation areas.
The impregnation station of the system is fitted with one or more thermostat controlled tanks that contain the resin and/or paint to be used in the process; this resin is kept constantly in circulation and overflow by means of special pumps. In presence of the part to be treated, the tank is automatically lifted in order to ensure that the stator or rotor, which is kept in controlled rotation, is immersed up to the specific required height.
The combination of time, rotating speed, resin viscosity and level of immersion ensures the optimal resin penetration inside the slots and on the heads of the pieces.
By keeping the part in constant rotation, both in the impregnation phase and in the subsequent gelification, the resin is distributed evenly on the whole winding of the stator or rotor and in its entirety on the part, getting high values of solid content after polymerization.
This impregnation method, capable of guaranteeing high values of bond strength on the wiring, is quite commonly used in all those products in which, during regular operation, the thermodynamic stress is particularly intense and when environmentally conditions are critic.

Icona per Roll Dip

Benefits

  • High impregnation quality
  • Maximum filling of winding slots
  • High Bond Strength standards
  • Excellent resin penetration and covering between magnetic laminations
  • Very short processing times
  • High productivity of plants
  • It is possible to use resins with or without monomers
  1. Ring Line
  2. Pilot Line
  3. U Line

3. Dipping

Immagine di presentazione di Dipping

The classic method of impregnation is the so-called Dipping, commonly used in electric motors, generators and in the production of transformers. The parts are dipped in a tank containing a resin suitable for this use and that provides excellent protection against a wide range of environmental factors, and the insulation of the cupper wirings.
After this dipping phase and after a dripping, the parts are dried in an oven allowing to the wire of the winding to become a homogeneous and mechanically stable integrated unit together with the lamellar packet.

The Dipping method of impregnation can be of either of these two types:
> Cold dipping
> Hot dipping

The immersion phase in cold dipping is carried out, as the name suggests, at room temperature.
The immersion phase in hot dipping instead requires a preheating of the parts before the immersion phase. Thanks to this additional step in the process, it is possible to use resins with a higher viscosity.

Icona per Dipping

Benefits

  • High production capacity
  • Ease of Use
  • Easy of management of parts loading and unloading (in baskets)
  • Flexibility
  • Reduced cost of investment
  • Reduced operating costs
  • Easy and cheap maintenance
  • Environmentally compatible
  1. Camelot Line
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