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Vacuum welding method of motor rotor

A technology for vacuum welding and motor rotors, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve problems such as failure to meet design requirements, heating deformation of motor shafts, and exceeding 650°C, so as to improve welding strength and quality, To ensure accuracy and quality, the effect of uniform welding temperature

Active Publication Date: 2015-01-07
XIANGTAN ELECTRIC MFG CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The annealing and softening temperature of chromium-zirconium copper is about 550°C. When using silver-copper solder and induction heating brazing or gas flame brazing for welding, the brazing temperature of this solder generally exceeds 650°C. In addition, due to heating Inhomogeneity, the local temperature of the end ring will far exceed 650°C during welding, which will cause severe annealing and softening of the chromium-zirconium copper base material so that it cannot meet the design requirements
Due to the relatively high welding, the motor shaft on the rotor will be heated and deformed, resulting in the dynamic balance of the motor not meeting the requirements, and the quality of the motor is unstable.

Method used

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: Referring to the accompanying drawings, it includes a guide bar 1 and an end ring 8. The brazing of the guide bar 1 and the end ring 8 is welded in a vacuum state, and the vacuum degree is about 1.0 Pa. The guide bar 1 and the end ring 8 The material is chromium-zirconium copper, and the material of the solder layer 2 is AuGeNiCu, refer to the attached figure 1 , the brazing material layer 2 is wrapped on the cylindrical welding position of the guide bar 1 before sintering, the outer circle of the brazing material layer 2 is wrapped with a stainless steel thin layer 3, and the outer circle of the stainless steel thin layer 3 is provided with a graphite fixed sleeve 4, and then The sintering is carried out under a vacuum state of about 1.0 Pa, and the sintering temperature is 370°C±5°C. After sintering, knock off the graphite fixing sleeve 4, take out the thin stainless steel layer 3, so that the AuGeNiCu solder layer 2 is attached to the cylindrical weldin...

Embodiment 2

[0028] Embodiment 2: Refer to Embodiment 1, wherein the sintering vacuum degree is 0.5Pa, and the sintering temperature is 350°C±2°C; wherein the welding vacuum degree is 0.5Pa, and the welding temperature is 560°C±2°C, and the rest are the same as the embodiment.

Embodiment 3

[0029] Embodiment 3: Refer to Embodiment 1, wherein the sintering vacuum degree is 0.5Pa, and the sintering temperature is 340°C±2°C; wherein the welding vacuum degree is 0.5Pa, and the welding temperature is 550°C±2°C, and the rest are the same as the embodiment.

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Abstract

The invention relates to a vacuum welding method of a motor rotor. The vacuum welding method adopts a guide strip and an end ring, wherein soldering of the guide strip and the end ring is welded at a vacuum state; and the guide strip and the end ring are made of a high-strength alloy copper material. The welding of the end ring and the guide strip is carried out at a vacuum state so that the welding temperature is very uniform and the problem that the partial temperature of the end ring and the guide strip is too high can be avoided. Furthermore, an oxidization reaction can not occur when the welding is carried out at the vacuum state so as to guarantee that a welding line can be well formed without adding a decontaminant when a soldering material is welded; particularly, a welding material is sintered at the welding part of the guide strip before the welding and a welding part is machined into a cylindrical shape, so that the use amount of the welding material is greatly saved and the welding precision and quality are ensured; and by utilizing the method to weld, the welding strength and quality of the end ring and the guide strip are greatly improved.

Description

technical field [0001] The invention relates to a motor manufacturing method, in particular to a vacuum welding method for a motor rotor. Background technique [0002] At present, the solder used for brazing copper alloys in China is generally silver-copper solder, and its brazing temperature is generally above 650°C, and deoxidizing substances must be added during welding. In the motor industry, the welding method of the guide bar and the end ring in the motor is generally induction heating brazing or gas flame brazing under normal conditions. For high-speed motors, high-strength alloy copper, such as chrome-zirconium copper, is generally used as the material of end rings and guide bars. The annealing and softening temperature of chromium-zirconium copper is about 550°C. When using silver-copper solder and induction heating brazing or gas flame brazing for welding, the brazing temperature of this solder generally exceeds 650°C. In addition, due to heating Inhomogeneity, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008
Inventor 李再华徐勤文张越雷陈雷曾跃军
Owner XIANGTAN ELECTRIC MFG CORP LTD