An optimization method for stator and rotor welding process

By combining modified composite materials and optimized laser welding parameters, the problems of insufficient joint strength and microstructure deterioration in traditional stator and rotor welding have been solved, resulting in high-strength, low-defect welded joints that improve the performance and stability of the motor.

CN120940821BActive Publication Date: 2026-05-26WUXI LIANYUANDA PRECISION MACHINED CO LTD
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Patent Information

Application Number
CN202510978490.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-07-16
Publication Date
2026-05-26
Estimated Expiration
2045-07-16

AI Technical Summary

Technical Problem

Traditional stator and rotor welding processes suffer from insufficient joint strength, coarse grains in the heat-affected zone, large deformation, and porosity and cracks, which lead to unstable motor performance and safety hazards in high-power and high-speed scenarios.

Method used

By using modified composite materials as a transition layer, combined with optimized laser welding parameters, including pretreatment, precise control of the laser welding equipment, and slow cooling process, the mechanical properties of the welded joint are improved by enhancing the wettability of the molten pool, inhibiting crack propagation, and refining the weld microstructure.

Benefits of technology

It significantly improves the tensile strength and toughness of the stator and rotor welded joints, reduces defects such as porosity and cracks, and improves the operational reliability and lifespan of the motor, especially performing excellently in high power density motors and drive motors for new energy vehicles.

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Abstract

This invention discloses an optimized method for stator and rotor welding processes in the field of motor manufacturing, comprising the following steps: improving welding quality through pretreatment, coating with modified composite materials, and optimizing laser welding parameters. During pretreatment, the stator and rotor areas to be welded are sanded with 800-1200 grit sandpaper, followed by ultrasonic cleaning with acetone or alcohol for 10-15 minutes to achieve a surface roughness Ra ≤ 1.6 μm; a 0.1-0.3 mm thick layer of modified composite material is coated onto one surface and dried at 80-120°C for 1-2 hours; laser welding is employed, with the molten pool temperature monitored at 1800-2200°C during welding; immediately after welding, the welded parts are placed in a holding furnace at 200-300°C for slow cooling for 2-4 hours, and then cooled to room temperature at a rate of 5-10°C / min. This method effectively improves the strength, toughness, and crack resistance of the welded joint, reduces the heat-affected zone, and minimizes deformation.
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