Motor products, the ordinary use of copper to the motor winding, for the wire-wound rotor motor will also involve the collector ring; DC motor commutator will also use copper. Careful observation and analysis can be found, the collector ring and the commutator pumping copper should be a copper alloy.
1. Conductive copper alloy applications
(1) conductive copper alloy used in electric motors, generators collector ring and commutator
Motor, generator collector ring and commutator requirements conductivity greater than 49.3mS/m, tensile strength greater than 294N/mm2, elongation greater than 2%, hardness greater than 90HV, good contact, high wear resistance, softening temperature over the working temperature. Silver copper, rare earth copper, cadmium copper, zirconium copper and chrome zirconium copper are generally used.
Hard copper is usually used to 80 ° C, higher than 150 ° C that begins to soften. Rare earth copper, silver copper and cadmium copper is suitable for use as motor commutator piece below 250 ℃. Zirconium copper is suitable for use as motor commutator sheet below 350°C. Chromium zirconium copper is suitable for 350 ~ 500 ℃ high-power motor commutator piece.
(2) for welding machine electrodes, electrode support, electrode arm and conductive collector ring
The electrode conducts the necessary welding current and transmits the necessary welding pressure. Electrode supports and electrode arms require high conductivity and strength, and conductive collector rings require high conductivity and wear resistance. A wide variety of materials to be welded, which must have a number of specific properties:
● Higher electrical and thermal conductivity than the material to be welded;
● High strength, especially hardness at high temperatures;
● No alloying adhesion to the weld material;
● Good resistance to oxidation, no oxidized skin is generated in use.
2. Selection of copper alloy for electrode application
● For aluminum, magnesium light alloy and copper alloy welding, can choose silver copper, cadmium copper, zirconium copper and diffusion hardening copper electrode;
For the welding of mild steel, nickel alloy and low alloy steel, zirconium copper, silver chrome copper, chrome copper, chrome cadmium copper, chrome aluminum magnesium copper and chrome zirconium copper electrodes can be used;
● For welding of stainless steel and heat-resistant alloys, electrodes of high conductive beryllium copper, drilled silicon copper, nickel-titanium copper and chromium-titanium-tin copper can be used.
● For special welding of platinum (box, belt), gold ornaments and filaments, etc. and when copper traces are not allowed on the surface of the workpiece, tungsten, molybdenum, copper-tungsten alloy, diffusion strengthened copper and composite electrodes can be used.
● For special cables, overhead conductors, communication lines and contact wires, etc., generally available silver copper, rare earth copper, cadmium copper, chromium-cadmium copper, blunt copper, composite metal conductors. Use, the maximum allowable temperature rise should not exceed the softening temperature of the selected material, requiring high conductivity and strength. Varies with the use, such as for cables, the requirements of good flexibility, easy to connect; for overhead conductors, vibration, corrosion and fatigue resistance; for contact wires, wear-resistant.
Used in a variety of electrical appliances, communication equipment and electronic tubes with reversing switches, springs and connectors, etc., requiring very high strength, hardness and elasticity limit, and wear, corrosion and fatigue resistance. Generally beryllium copper, titanium copper, tin phosphor bronze, etc..
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