Motor rotor end ring and guide bar brazing method

Abstract

The invention relates to a motor rotor end ring and guide bar brazing method. The motor rotor end ring and guide bar brazing method comprises the following steps: removing oxides on the outer circle of an end ring and at the two ends of rotor guide bars, and cleaning oil stain on a brazing surface; arranging the guide bars above the end ring according to a preset scheme and keeping the clearance between the guide bars and the end ring to be smaller than 0.5mm; rotating a rotor, uniformly heating the end ring and starting brazing when preheating temperature reaches 350-400DEG C; uniformly heating the end ring and the guide bars, and striking the guide bars through external force when the guide bars become dark red to enable the clearance between the end ring and the guide bars to be smaller than 0.1mm; when the temperature of the brazing surface of the end ring and the guide bars is higher than 705DEG C, keeping the braking surface to be horizontal and adding brazing filler metal to conduct brazing, wherein the brazing temperature is 705-815DEG C; cooling. The motor rotor end ring and guide bar brazing method has the advantages that since a lower end ring type brazing process is adopted, the brazing filler metal only needs to fill the clearance between the end ring and the guide bars after the brazing filler metal is molten, a sector-shaped brazing circular bead only needs to be formed on the outer edges of the guide bars and the amount of the used brazing filler metal is obviously reduced.

Description

technical field [0001] The invention belongs to the field of motors, in particular to a brazing method for an end ring of a motor rotor and a guide bar. Background technique [0002] The brazing of the end ring and the rotor guide bar is an important link in the motor production process, and the quality of the brazing directly affects the performance parameters of the motor. In order to ensure product quality, a tank-type end-ring brazing structure is usually used. [0003] The tank type end ring brazing process is to put the rotor guide bar into the end ring tank, fill the tank after the silver solder is melted, and form a firm joint with the end ring and guide bar after the solder solidifies. The brazing material in the welding structure is BAg30CuZnSn (containing 30% silver). [0004] For some 4-pole, 6-pole and above motors that do not have high requirements for starting, if the traditional tank-type end-end ring brazing process is still used, it will cause serious was...

AI Technical Summary

Problems solved by technology

[0004] For some 4-pole, 6-pole and above motors that do not have high requirements for starting, if the traditional tank-type end-end ring brazing process is still used, it will cause serious waste of brazing material, increase production costs, and reduce economic efficiency. benefit

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