Magnetic material for motor core and method for producing the same

By alternately setting nanocrystalline alloy layers and soft magnetic composite material layers in the motor core, and setting an insulating interface layer and internal thermal management channels between the layers, the problems of low loss, insulation stability and heat dissipation of high-frequency motor cores are solved, thereby improving the stability and efficiency of high-frequency operation.

CN122201980APending Publication Date: 2026-06-12HENAN XIN HAO SHENG DA IND CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HENAN XIN HAO SHENG DA IND CO LTD
Filing Date
2026-03-24
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing high-frequency motor core materials struggle to simultaneously achieve high magnetic permeability, interlayer insulation stability, structural stability, and heat dissipation capabilities. The current challenge is to provide a magnetic material for motor cores and its manufacturing method to address these issues. This would solve or overcome the limitations of existing high-frequency motor core materials in achieving high-frequency low loss, interlayer insulation stability, structural strength, and heat dissipation capabilities, thereby reducing eddy current losses, improving temperature rise, and enhancing operational stability under high-frequency conditions. This is a problem that urgently needs to be solved by those skilled in the art.

⚗Method used

By alternating nanocrystalline alloy layers and soft magnetic composite material layers along the lamination direction, a magnetically conductive layer and an isolation layer structure are formed, and a continuous insulating interface layer is set between the layers. At the same time, a thermal management channel network is constructed inside the soft magnetic composite material layer, forming a synergistic construction of magnetically conductive paths, insulating paths and heat dissipation paths, so as to achieve low loss, good temperature rise control and structural stability of the material under high frequency operating conditions.

🎯Benefits of technology

It achieves low material loss, good temperature rise control and structural stability under high-frequency operation conditions, and improves the operating efficiency and service reliability of the motor core.

✦ Generated by Eureka AI based on patent content.
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Abstract

The application discloses a kind of magnetic material for motor core and its production method.The magnetic material includes nanocrystalline alloy layer and soft magnetic composite material layer which are alternately laminated along the lamination direction, and an interlayer insulation interface layer is arranged between the two;The soft magnetic composite material layer is formed by pressing soft magnetic metal powder, heat-resistant insulating binder phase and electrically insulating heat-conducting filler, and the mass fraction of the heat-conducting filler is 5-30%;A heat management channel network with a channel diameter of 50-200 μm is arranged inside the soft magnetic composite material layer.The production method includes plane flow casting, nanocrystallization magnetic field heat treatment under inert atmosphere, interlayer pressing and introduction of removable template, alternating stacking lamination curing, and channel formation by solvent dissolution or pyrolysis at 250-450°C under inert atmosphere, followed by sealing and interface assembly.This scheme reduces high-frequency loss while maintaining magnetic flux transmission capacity, improves temperature rise control, and improves core high-frequency operation stability and service reliability.
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