Supply DuPont film DuPont insulation film 0.008~0.25mm

厚度：

0.008~0.25mm

宽度：

10~1060mm

长度：

200~3000m

DuPont film is a composite film composed of R and corona-resistant polyimide films with superior thermal conductivity, heat resistance, mechanical properties and electrical properties. R (R represents the fluororesin adhesive layer and R is the corona-resistant meaning) corona-resistant film applied to winding wires. This kind of insulation material is much thinner than corona-resistant mica products and has better corona resistance. It can be seen from the test data of DuPont<>
BB and Siemens that the corona resistance life of R can exceed (&;. years) under an AC voltage / electric field strength, while the ordinary polyimide film only has The former is twice as large as the latter. The corona resistance is significantly improved, and the thermal conductivity of R is also twice as high as that of ordinary films. In order to manufacture traction motors for high-speed locomotives in my country, Zhuzhou Electric Locomotive Research Institute collaborated with our company to develop corona-resistant film-wrapped wires wrapped with R polyimide film and sintered on copper wires. From small trials to mass production, we have solved the main technical problems and carried out a large number of equipment modifications, and have been able to mass-produce corona-resistant film-wrapped wires for traction motors that fully meet user requirements.
In order to ensure the production quality of winding wires, we must first select high-quality oxygen-free copper rods and peel off the oxide scale on the surface of the copper rods, and then use online microcomputer-controlled non-destructive eddy current flaw detection technology to detect surface burrs on the bare copper wires during the manufacturing process. and defects to ensure the surface quality of the bare copper wire, and then go through multiple annealing and other processes. Finally, the smooth bare copper wire is wrapped with R film and sintered on a high-frequency sintering machine to become a corona-resistant film wrapped sintered copper flat wire<>.
From the insulation on the bare copper wire to the winding of the finished winding wire, the imported foreign advanced electromagnetic wire insulation continuity detector is used for online testing to ensure the insulation quality of the entire winding wire.
Three types of winding wires wrapped with <>corona-resistant polyimide film
, general polyimide film and mica tape. Electrical aging comparison tests were conducted in the Small Motor Insulation Structure Laboratory of Shanghai Electrical Apparatus Research Institute. The test specimens are model coils made of winding wires according to the actual process and insulation structure of the motor factory. This can reflect the bending and kink stress on the inter-turn insulation during the actual insulation process. From the test results, it is obvious that although the sample made of corona-resistant polyimide film withstands a higher field intensity during the test than the samples made of the other two materials, its actual life is still longer than that of the samples made of the other two materials. Much longer. It is estimated that the corona-resistant polyimide film can have a working life of more than 10 years at a working voltage of ~. It shows that the electromagnetic wire wrapped with corona-resistant polyimide film has stronger corona resistance during the electrical aging process than the electromagnetic wire wrapped with mica tape and ordinary polyimide film.