Electromagnetic wire for new energy automobile driving motor and preparation method thereof

Abstract

The invention relates to an electromagnetic wire for a new energy automobile driving motor. The electromagnetic wire comprises a flat wire and an insulating layer. The insulating layer comprises a first polyimide layer coated outside the flat wire, a second polyimide layer coated outside the first polyimide layer, and a polyether-ether-ketone resin layer coated outside the second polyimide layer.The fillet radius of the flat wire is 0.25-0.3 mm. The first polyimide layer is formed by coating polyimide paint with the viscosity thereof to be 12-18 Pa*s at the temperature of 30 DEG C. The secondpolyimide layer is formed by coating polyimide paint with the viscosity thereof to be 5-10 Pa*s at the temperature of 30 DEG C. The electromagnetic wire disclosed by the invention has the advantagesof high-frequency pulse partial discharge resistance, ultrahigh voltage breakdown resistance, excellent electric heating resistance, mechanical property, chemical resistance, hydrolysis resistance, friction resistance and wear resistance, good toughness and strong radiation resistance.

Description

technical field [0001] The invention belongs to the technical field of electrical materials, and in particular relates to an electromagnetic wire for a drive motor of a new energy vehicle and a preparation method thereof. Background technique [0002] With the development of electric vehicles, higher requirements are placed on the miniaturization and weight reduction of drive motors. At present, the section of the stator slot of the automobile motor is pear-shaped, and the cross-section of the enameled wire is circular. The space utilization of the slot is limited, and usually only about 80% of the slot can be achieved. Into these gaps, the thermal resistance is high, which is not conducive to the heat transfer of the conductor to the outside; in addition, because the gap is large, it is also prone to insufficient resin filling, resulting in insulating air gaps, causing partial discharge and other problems. [0003] The enamelled flat wire can solve the above problems to a ...

AI Technical Summary

Problems solved by technology

At present, the section of the stator slot of the automobile motor is pear-shaped, and the cross-section of the enameled wire is circular. The space utilization of the slot is limited, and usually only about 80% of the slot can be achieved. Into these gaps, the thermal resistance is high, which is not conducive to the heat transfer of the conductor to the outside; in addition, because the gap is large, it is also prone to insufficient resin filling, resulting in insulating air gaps, causing partial discharge and other problems

[0003] The enamelled flat wire can solve the above problems to a certain extent. However, the minimum fillet radius R of the enamelled flat wire can only be about 0.6mm. If the fillet radius of the flat wire is further reduced , the rounded corner of the flat wire is not easy to hang paint, so that the thickness of the paint layer at the rounded corner of the flat wire is thinner than that at other parts of the flat wire, which leads to easy cracking of the paint film and poor voltage breakdown resistance. Therefore, when it is used in the driving motor of new energy vehicles, the performance of anti-high-frequency pulse partial discharge and voltage breakdown resistance still needs to be improved.

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