ATF oil-resistant, hydrolysis-resistant insulating layer, magnet wire and preparation method

Abstract

The invention discloses an ATF oil-resistant, hydrolysis-resistant insulating layer, an electromagnetic wire and a preparation method. The ATF oil-resistant and hydrolysis-resistant electromagnetic wire of the invention comprises a metal conductor, a first polyimide layer, and a second polyimide layer from inside to outside. Amide-imide layer, third polyimide layer, fourth polyamide-imide layer, fifth polyimide layer, sixth polyamide-imide layer, seventh polyimide layer. The invention has excellent ATF oil resistance, hydrolysis resistance, voltage breakdown resistance and high-frequency pulse partial discharge resistance electromagnetic wire for an electric vehicle oil-cooled motor and a preparation method thereof, and is a high-performance enameled wire.

Description

technical field [0001] The invention belongs to the technical field of electrical materials, and in particular relates to an ATF oil-resistant and hydrolysis-resistant electromagnetic wire for an electric vehicle oil-cooled motor and a preparation method thereof. Background technique [0002] As electric vehicles have higher and higher requirements for motor power density, the Ministry of Industry and Information Technology and the National Development and Reform Commission proposed that the power density of passenger car motors should reach >4KW / kg in 2025, and the torque density of commercial vehicles should reach >19N m / kg. Under the indicators of high power density and high torque density, the temperature rise of the motor is the most difficult link to overcome. Water cooling technology is currently the mainstream heat dissipation method, but it cannot directly cool the heat source. Oil cooling technology with higher heat dissipation efficiency has become a research...

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Problems solved by technology

[0002] As electric vehicles have higher and higher requirements for motor power density, the Ministry of Industry and Information Technology and the National Development and Reform Commission proposed that the power density of passenger car motors should reach >4KW / kg in 2025, and the torque density of commercial vehicles should reach >19N m / kg. Under the indicators of high power density and high torque density, the temperature rise of the motor is the most difficult link to overcome. Water cooling technology is currently the mainstream heat dissipation method, but it cannot directly cool the heat source. Oil cooling technology with higher heat dissipation efficiency has become a research hotspot.

The oil cooling is to directly spray the ATF oil on the end of the motor winding to dissipate heat. The insulating material is in direct contact with the ATF oil and the ATF oil also contains a small amount of water (generally the water content is below 5000 OPPM). Due to poor oil resistance, long-term corrosion and hydrolysis of ATF oil, the performance is obviously reduced, which seriously affects the reliability of oil-cooled motors

[0003] At present, the electromagnetic wires used in domestic oil-cooled motors must rely on imported products. The imported electromagnetic wires are very expensive, and the imported electromagnetic wires are in the oil-water mixture of 99.5vol% ATF oil + 0.5vol% pure water in the sealed tube ("oil-water mixture" The height of the liquid level is 75% of the depth of the container), all the samples are immersed in the "oil-water mixture" (155°C / 40h~-45°C / 8h) cycle, the switching time is less than 5min (two-box method, switch samples outside the box), After 8 cycles of high and low temperature cycles, the paint film will fall off during 1d winding, and the corona resistance life will drop very seriously, with a retention rate of about 5%. Therefore, when it is used for oil-cooled motors of electric vehicles with direct spray technology , the 1d winding and corona resistance life performance of the paint film still need to be improved

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