Nano-enhanced rich resin mica tape with high thermal conductivity and applications thereof

Abstract

The invention discloses a nano-enhanced rich resin mica tape with high thermal conductivity and applications thereof. The nano-enhanced rich resin mica tape with high thermal conductivity is formed by compounding a layer of mica paper, a layer of alkali-free glass cloth or two layers of alkali-free glass cloth, adhesive resin and inorganic nano powder, wherein the weight per unit area of each component is as follows: 70-140g / m<2> of mica paper, 15-70 g / m<2> of alkali-free glass cloth, 60-100 g / m<2> of adhesive resin and 1-15 g / m<2> of inorganic nano powder. The nano-enhanced rich resin mica tape with high thermal conductivity is applied to prepare main insulation of a high-voltage motor. With the adoption of the main insulation prepared by the nano-enhanced rich resin mica tape with high thermal conductivity, the heat conductivity coefficient is not lower than 0.35W.m-1.K-1, the bending strength is not lower than 120MPa at the temperature of 155 DEG C, and the electrical service life is not lower than 1200 hours under 10kV / mm electric field intensity, so that the nano-enhanced rich resin mica tape with high thermal conductivity and applications thereof are beneficial for lowering the temperature rising of a generator and the manufacturing cost of the whole generator, and improving the running reliability of the unit.

Description

technical field [0001] The invention relates to the field of manufacturing high-voltage motor main insulation, in particular to a nano-reinforced high-thermal-conductivity multi-glue powder mica tape used for manufacturing high-voltage motor main insulation. Background technique [0002] Powder mica tape is a tape-shaped material specially used to make the main insulation of high-voltage motors. It is usually made of a layer of reinforcing material (alkali-free glass cloth or organic film) and a layer of powder mica paper bonded together by adhesive resin. It is made by bonding two layers of reinforcing materials with a layer of powder mica paper in the middle by bonding resin. In the industry, the mica tape with a binding resin content of 5-10% is called a less-adhesive mica tape, and the mica tape with a binding resin content of 32-40% is called a multi-adhesive mica tape. In the prior art, there are two methods for making the main insulation of high-voltage motors: one i...

AI Technical Summary

Problems solved by technology

The comprehensive properties of these existing multi-glue mica tapes are not bad, but generally have a low thermal conductivity (only 0.25-0.28W·m -1 ·K -1 ), poor mechanical properties when the temperature exceeds 100°C (for example: the bending strength at 100°C is only 20-30MPa), etc.

[0004] When these existing multi-powder mica tapes are applied to the main insulation of internally cooled high-voltage generators, since the operating temperature of the internally cooled units is generally only 70-90°C, their performance can basically meet the application requirements; When the main insulation of the air-cooled high-voltage generator is used, because the heat dissipation method of the air-cooled unit is different from that of the internal cooling unit, the heat generated inside the generator must pass through the main insulation to be dissipated outwards. The temperature rise of the generator is reduced, resulting in the actual operating temperature of the conventionally designed air-cooled unit at full load often reaching 100-120°C, and the technical defect of the existing multi-glue mica tape with poor mechanical properties when it exceeds 100°C will also Resulting in reduced operational reliability of the air-cooled unit

Therefore, in order to reduce the full-load temperature rise of the air-cooled unit when using the existing multi-powder mica tape to manufacture the main insulation of the high-voltage motor, the conventional method can only be to increase the volume of the generator in design and improve the ventilation and heat dissipation conditions, but this Will increase the manufacturing cost of the air-cooled unit