Large copper stator

1. By the material of the stator windings, it can be classified into copper and aluminum stators.
   Common stators are made of purple copper, with an insulating varnish coating on the outer layer. However, some low-end motors may use enamel-coated aluminum wire as the material. Such stators are cheaper. The value difference between copper and aluminum is more than three times, so it should be clearly agreed upon the specific material before trading to avoid significant losses and claims.
2. By the specifications of the stator, it can be classified into large, medium, small, and mixed stators.
   Stators of different sizes may have slightly different copper contents. Generally, small stators have a slightly higher copper content than large stators. Mixed stators require an accurate ratio of large, medium, and small stators to help the buyer estimate a reasonable price.

Copper stators are disassembled from motors, so individual copper stators for sale are generally produced by scrap processing plants with disassembly capabilities.
Regarding the sources of motors, they are commonly found in various agricultural, industrial, and living environments. Therefore, the production of scrap motors is also widespread. Besides being related to population density, scrap motors are also produced in large quantities in industrially dense regions. Globally, the main sources of scrap motors are the United States, Europe, Japan and South Korea, and Australia. Due to the high labor costs required to process and handle scrap motors, the cost of labor in these developed regions far exceeds the value of the motors themselves, hence, scrap motors from these regions are primarily exported.

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

1. Separating and dismantling the windings
   Generally, copper windings on the stator are removed by manual cutting and other methods. The clean stator shaft (made of 20Mn5Cr manganese steel) is separated and sold separately.
2. Processing the winding section
   The winding section is the enamel-coated wire. Depending on the needs, equipment, and export direction, the processing methods differ. Some processing plants can directly pack and sell the enamel-coated wire. Since China does not allow the import of enamel-coated wire, if it is intended to be exported to China, the enamel-coated wire needs to be either burned to remove the coating or crushed into copper granules (communication wire grade two).

The detection of copper stators mainly focuses on whether the windings are copper or aluminum. Both parties should avoid trading aluminum wire stators as copper wire stators, as this can lead to disputes.

The processing of copper stators requires a high degree of manual labor, and direct import of such scrap is strictly regulated by various countries. Thus, the disassembly of copper stators mainly occurs in Southeast Asian countries like Thailand, Malaysia, and also in countries like Pakistan and India. These countries have more relaxed import and export policies and lower labor costs. Copper stators are best directed to mixed scrap processing plants in these regions.

In copper stator transactions, the most important aspect to pay attention to is whether the images provided in the quotation are genuine. In the absence of the buyer's ability to inspect the goods on-site, the seller should provide as detailed, accurate, and representative physical images as possible. Some suppliers tend to use a few fixed images for quotations over a long period, which poses significant risks. The value of copper stators to some extent depends on the buyer's judgment of the value of stators of different sizes and shapes. If the images do not match the actual goods, it can easily result in losses and claims. In advance communication, the supplier should be fully responsible for any mismatch between the photos and the physical goods.
Secondly, the material of the windings should be verified—whether they are copper or aluminum wires? What proportion of the batch consists of aluminum wire motors? Generally, motors are allowed to have copper-aluminum mixtures, as it is difficult to determine the winding material without disassembly. However, after disassembling into stators, the winding material is easily identifiable, and it is a basic requirement that aluminum windings should not be mixed in the individual sale of stators.