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insulating materials used in modern electrical machines - heat transfer film

by:Cailong     2019-07-16
insulating materials used in modern electrical machines  -  heat transfer film
Insulation Materials are non-metallic materials and current is not allowed to pass through them at normal temperatures.
They may be organic or inorganic, with uniform or uneven composition, natural or synthetic.
There are many insulating materials used in electrical appliances and machinery.
MicaMica is a widely used insulating material.
It is used in the form of paper.
Therefore, it is difficult to work on mica.
Therefore, it is used in the form of split sheets combined with shellac, asphalt or synthetic or polymer.
The cloud film consists of cloud film, paper and dry packaging.
It can be formed directly on the conductor and then rolled and compressed between the heating plates to solidify the material and discharge the air.
Fiber glass is made from materials that do not contain alkaline metal oxides, which may form a surface coating and may attack glass silica.
Tape and clothes woven from continuous filament of glass have high resistivity, thermal conductivity and tensile strength, and form good insulation with a temperature tolerance of 30 degrees Celsius.
Fiberglass insulation is easily worn.
Glass does not absorb moisture, but the capillary action between filaments may attract moisture.
These insulation materials are widely used in induction motors.
AsbestosThis material has weak mechanical strength and poor insulation compared with glass fiber.
Asbestos laminate made of synthetic resin has good mechanical strength and heat resistance.
Asbestos in wire form has good wear resistance.
The cotton fiber woven from acetic acid fiber cotton has very good heat resistance, which is much worse than the moisture absorption of ordinary cotton.
The polyamide present in the form of nylon tape has a high mechanical strength.
Their space factor is very good.
Nylon film is one of the few plastic films with sufficient temperature resistance.
It can withstand tearing.
Acrylic resin-synthetic resin
When covered with synthetic resin porcelain glaze, acetate or nylon has an excellent smooth finish and has been used in most windings.
They have good constraints on the winding.
Wood is a form of synthetic resin immersion.
It turns out to be a solid and accurate material packing block, coil holder and gasket.
However, the presence of humidity greatly reduces the insulation properties of the wood.
Silicone is a semi-organic material with the basic structure of alternating silicon atoms and oxygen atoms.
They are very heat resistant.
They act as adhesives and allow continuous operation at temperatures above 180 degrees Celsius.
Even if they break down at too high temperatures, they form Silicon, which is also an insulator.
Silicone has waterproof and anti-corrosion properties.
They are used for dry-type transformers, traction motors, rolling mill motors and micro-aircraft machines operating within a winding temperature range of more than 200 degrees Celsius.
They have high thermal conductivity, which increases the heat transfer coefficient and is conducive to heat dissipation from conductors.
Epoxy resin.
These materials play an important role in casting filling, laminated adhesive and painting applications, and in the packaging of small transformers.
Synthetic resin laminated synthetic resin adhesive paper, cotton and fiberglass have good electrical and mechanical properties such as paper in large cylinders and tubes.
Petroleum-based mineral oil is widely used for cooling and insulation of oil-immersed transformers.
Important features of petroleum-based mineral oil are chemical stability, coefficient of expansion, oxidation resistance and viscosity.
They have very good electrical properties when they are clean.
With the increase of impurities and moisture, their performance is reduced.
These are non-flammable insulating liquids.
When these liquids are stuck by an arc, non-explosive gases are generated, so they are safe.
The most common askarel is a 3/2-square-meter-of-six-chlorine-dibenzene-three-chlorine-propylene mixture with low pour points and satisfactory viscosity/temperature properties.
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