Large copper armature

1. Differentiated by the material of the rotor winding, it can be classified as copper or aluminum rotors.
   Commonly, rotors are made of purple copper with an outer layer of insulating paint. However, some low-end motors use enamel-coated aluminum wires. Such rotors are cheaper. The value difference between copper and aluminum is more than three times, and the specific material type should be agreed upon before transactions to avoid high losses and claims.
2. Differentiated by the size of the rotor, it can be classified as large, medium, small, or mixed rotors.
   Rotors of different sizes have slightly different copper content. Generally, smaller rotors have a slightly higher copper content than larger ones. Mixed rotors require a precise ratio of large, medium, and small rotors to help buyers provide a reasonable valuation.

Copper rotors are disassembled from motors, so separately sold copper rotors are generally produced from waste processing facilities with disassembly capabilities.
In terms of motor sources, their usage is widespread across various agricultural, industrial, and living environments. As a result, the output of waste motors is also very extensive. Apart from being related to population density, industrial dense regions produce more waste motors. Globally, the United States, Europe, South Korea, Japan, and Australia are the primary sources of waste motors. Due to the significant labor required to process waste motors, the labor costs in these developed regions far exceed the value of the motors themselves, leading to these places primarily exporting their waste motors.

The value of waste motors mainly lies in the copper content, so the value points revolve around copper content.

1. Separating and dismantling windings
   Generally, copper windings are removed from the rotor by manual cutting or other methods. The removed copper winding core (made of 20Mn5Cr manganese steel) is sold separately.
2. Processing the winding part
   The winding part is the enamel-coated wire, and its processing methods vary depending on different requirements, equipment, and export directions. Some processing plants can directly package and sell enamel-coated wires. However, as China does not allow the import of enamel-coated wires, if exporting to China, the enamel-coated wires must either be burned to remove the insulation or be processed into copper granules (No. 2 communication line granules).

The detection of copper rotors mainly focuses on whether the windings are made of copper or aluminum. Both buyers and sellers should avoid trading aluminum-wired rotors as copper-wired rotors, as this can lead to disputes.

The processing of copper rotors requires significant manual labor, and countries have strict regulations on the direct import of such waste. Therefore, the disassembly of copper rotors mainly takes place in Southeast Asian countries such as Thailand, Malaysia, Pakistan, and India. These countries have more lenient import and export policies and lower labor costs. Copper rotors are most suitable for delivery to mixed waste processing plants in these regions.

In copper rotor transactions, the key point of concern is whether the images provided in the bid are genuine. In cases where buyers cannot inspect the goods on-site, sellers should provide detailed, accurate, and representative physical images. Some suppliers often use a few fixed photos for bidding, which poses significant risks. The value of copper rotors depends on the buyer's valuation of different sizes and shapes of rotors, and mismatched images and goods can easily cause losses and claims. In advance communication, suppliers should be held fully responsible for discrepancies between images and physical goods.
Additionally, the material of the windings should be considered. Are they copper wires or aluminum wires? What proportion of the batch consists of aluminum-wired motors? Generally, motors may contain a mix of copper and aluminum because it is difficult to determine the winding material before disassembly. However, once disassembled into rotors, the material is easily identifiable, and it is a basic requirement not to mix aluminum-wired rotors with copper-wired rotors when sold separately.