Motor reverser and voltage-sensitive resistor laser welding device and method

Abstract

The invention discloses a motor reverser and voltage-sensitive resistor laser welding device and method, the laser welding method is suitable for the technical field of laser welding. The motor reverser and the voltage -sensitive resistor laser welding device comprise a laser preheating mechanism for heating the commutator terminal and a laser welding mechanism for jetting the welding ball to theterminal of the pre-heating commutator, and a controller for coordinating the working of the laser preheating mechanism and the laser welding mechanism. During use, the laser preheating mechanism is used for heating the terminals on the commutator with high heat conduction, and then injecting molten welding balls into the terminal and the voltage -sensitive resistor bonding pad, due to the fact that the terminal of the commutator is preheated, the temperature of the welding ball can be reduced, and the terminal can be soaked with the terminal, the voltage -sensitive resistor bonding pad cannotbe separated from the ceramic base, the welding process difficulty is lowered, meanwhile, due to the fact that the mass error of each ball is small, the welding spots are evenly distributed, so thatthe quality of each welding spot can be prevented from being unbalanced due to the fact that the quality of each welding spot is not uniform, and the service life is prolonged.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a laser welding device and method for a motor commutator, a piezoresistor and a piezoresistor. Background technique [0002] In the production process of the existing motor, the commutator needs to be welded with the coil on the rotor. Usually, the commutator is set on the rotor shaft, and a varistor is installed on the end of the commutator. The varistor The resistor has silver pads for connecting the commutator and coil. [0003] At present, two welding methods are generally used. The first one is the manual soldering iron method. When soldering, flux is needed, and the solder is glued on the soldering iron for soldering. Since the silver pad and the commutator terminal are made of different materials, their thermal conductivity is different. The thermal conductivity of the silver pad is poor, while the commutator conducts heat faster. When welding at the same higher temperat...

AI Technical Summary

Problems solved by technology

[0003] At present, two welding methods are generally used. The first one is the manual soldering iron method. When soldering, flux is needed, and the solder is glued on the soldering iron for soldering. Since the silver pad and the commutator terminal are made of different materials, their thermal conductivity is different. The thermal conductivity of the silver pad is poor, while the commutator conducts heat faster. When welding at the same higher temperature (welding energy), it is easy to cause the silver pad to separate from the ceramic base, while the commutator is welded at a lower temperature. Insufficient temperature, prone to weak welding

At the same time, the amount of tin used for each solder joint is different during manual welding, which makes the quality of the distribution around the rotor shaft different, and the gravity is located outside the shaft center, causing noise during use and affecting the service life.

When using flux soldering, it needs to be cleaned after soldering, which will cause environmental pollution, increase the process, and affect production efficiency

[0004] The second method adopts the laser tin wire welding method, by rotating the tin wire at the position of the solder joint, laser irradiating the tin wire for welding, and because the piezoresistor and the commutator are made of different materials, their thermal conductivity is different, and the voltage The thermal conductivity of the silver pad on the varistor is poor, while the commutator conducts heat faster. When welding at the same higher temperature (welding energy), it is easy to cause the silver pad of the varistor to separate from the plate, while welding at a lower temperature When the welding temperature of the commutator is insufficient, it is easy to appear the phenomenon of weak welding

At the same time, during laser tin wire welding, the laser irradiation process is also easy to reflect to the coil on the rotor, burning out the coil insulation layer, and causing a short circuit of the coil

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