Commutator material, method for manufacturing same, and micromotor using same

Abstract

A commutator material such that all or part of a conductive substrate is plated with silver or a silver alloy, and the silver or silver-alloy surface is further plated with gold or a gold alloy, the commutator material being characterized in that after the conductive substrate is plated with the silver or silver alloy, surface-reduction processing is performed and then the gold or gold alloy is applied in stripes.

Description

technical field [0001] The present invention relates to an electric contact material and its manufacturing method; more specifically, it relates to an electric contact material with excellent sliding properties, its manufacturing method, and a micromotor having the same. Background technique [0002] Micromotors are widely used in many applications such as audio equipment, home appliances, mobile phones, cameras, and automobiles. The life of the motor is determined by the durability of the commutator and the brushes, which are components for energizing the motor coils. Materials excellent in wear resistance, arc resistance, electrical connectivity, conductivity, strength, etc. are required for this member, and generally Ag alloy-coated Cu alloy strips are often used. The material is a high-performance conductor that combines the wear resistance, arc resistance, and electrical connectivity of Ag alloys with the strength and electrical conductivity of Cu alloys. [0003] Sta...

AI Technical Summary

Problems solved by technology

[0007] (1) The coverage rate of precious metals such as Ag or Pd is large, so the cost is high

[0008] (2) Manufactured by the cladding method, so the manufacturing cost is high

[0009] (3) The cladding is manufactured by repeated annealing and rolling, so the surface of the Ag alloy will form a processing deformation layer caused by processing, the arc resistance is poor, the wear of the commutator and the brush is fast, and the life of the motor is short

[0010] (4) The cladding is manufactured by repeated annealing and rolling, so the alloy components other than Ag are enriched on the surface of the Ag alloy, the initial contact resistance is high, and the corrosion resistance is also poor

[0011] (5) Parts other than the Ag alloy part and the solder plating part expose the base material, and the Cu alloy base material will discolor due to poor corrosion resistance, or if it deteriorates further, it will be caused by the creep phenomenon of corrosion products. Contamination of the contact part

[0018] In addition, it can be seen that if silver or silver alloy is formed on the outermost layer, it will combine with sulfur to turn black when the motor slides or stops, and there is a tendency to increase the contact resistance.

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