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Wind Turbine PI Film Applications

Wind Turbine PI Film Applications

Open wind turbines installed outdoors are subject to condensation or rainwater accumulation under certain special conditions. Rainwater may be blown into the generator by strong winds through the gap between the stator and rotor on the impeller side, placing greater demands on the water resistance of the motor insulation structure. For wind turbines with low operating voltages and thin insulation, the entry of rainwater can cause a reduction in insulation performance or even trigger early failure of the stator insulation, which does not ensure the required 20-year life of the wind turbine.

The water resistance of the insulation structure can be improved by process optimization, by blocking water vapor from entering the insulation or by enhancing the water resistance of the impregnating varnish after curing, and the water resistance of the electromagnetic wire, as the last line of defense of the insulation structure, is also crucial. The water resistance of polyimide film sintered wire is mainly due to the heat-sealing effect of the fluorine-coated layer, which is related to the film structure and the sintering process.
 
The polyimide film is produced by the salivation method and is fluorinated on one side to make a single-sided fluorinated polyimide film (FH film) and on both sides to make a double-sided fluorinated polyimide film (FHF film).
 
The film sintered wire double twist bend water immersion test is a double twist adhesion test where the sample is bent 900 from the middle of the specimen, then the bent part is immersed in water and the insulation resistance is tested for 1 min at certain intervals. This test simulates the waterproof performance of the product coil, the greater the insulation resistance, the better the waterproof performance. The insulation resistance of the FHF film sintered wire was greater than that of the FH film sintered wire after a long period of immersion (>24h), indicating that the long-term waterproof performance of the FHF film sintered wire is significantly better than that of the FH film sintered wire. During the experiment, after 24 h of immersion in water, the FH film-sintered wire samples showed obvious traces of water ingress, while the FHF film-sintered wire showed no obvious traces of water ingress even after 500 h of immersion in water.
 
The breakdown voltage indicator of the film-sintered wire in water is a consideration of its overall waterproof performance. The breakdown voltage of the film-sintered wire in water is related to the peel strength of the fluorine-coated film and the thickness of the base film, so the focus is on the dispersion of the breakdown voltage in water.
The normal production speed of a polyimide film sintering line is 4-6 m/min; the normal production speed of an FHF polyimide film sintering line is 2-4 rn/min, the latter being less efficient. At present, the production equipment of film sintering lines generally uses a high-frequency inductor for electromagnetic induction heating, bare copper wire in polyimide film winding after the magnetic field cutting magnetic induction line to produce surface eddy current, making the surface of bare copper wire heat up, so that the film surface of the fluorine coating layer melted" 1. 12,. The film sintering line is then pressed through a pressure wheel after the high-frequency sintering to make the bond between the film and the copper wire and the film and the film tighter and to expel the gas at the same time.
 
Because the FHF polyimide film sintering line only has a glue lap surface, its outer surface is a fluorine layer, the sintering temperature is too high is very easy to produce a glue tumor at the pressure wheel, which seriously affects the shape and size of the electromagnetic wire, so compared to the high-frequency sintering temperature of the FH film sintering line, the sintering temperature of the FHF film is 10~20℃ lower, and the car speed of the FHF film sintering line is also lower.
 
The adhesion of the FHF film sintering line is better than that of the FH film sintering line. the insulation resistance and water breakdown voltage of the FHF film sintering line after water immersion are higher than that of the FH film. the water breakdown voltage of the FHF film sintering line increases with the thickness of the adhesive layer The dispersion decreases as the layer thickness increases. However, the thickness of the adhesive layer is too thick, which will produce a large number of glue nodules during the subsequent sintering process, which will affect the appearance and size of the wire, therefore, the thickness of the adhesive layer of FHF film is 0.013 mm.

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