The question of how much copper is in the motor of an old refrigerator often arises when selling equipment for scrap or when you want to carry out independent repairs of the unit. The cost of non-ferrous metals on the recyclables market constantly fluctuates, so accurate knowledge of the weight of the potentially extracted resource allows us to assess the economic feasibility of dismantling. Owners of household appliances often mistakenly believe that the entire engine consists of pure metal, but the actual design of the compressor is much more complex and multi-layered.
The average weight of the copper winding in a standard household compressor varies from 0.5 to 1.2 kilograms, which is only a fraction of the total mass of the unit. This indicator directly depends on the power of the electric motor, the year of manufacture of the model and the manufacturer of components. Modern energy-efficient units may contain less copper due to optimized design, while Soviet models were famous for their large margin of safety and significant content of non-ferrous metal.
It is important to understand that extracting copper requires not only physical effort, but also compliance with safety precautions, since the refrigerant inside the system may be under pressure. Before starting any dismantling work, you must ensure that the freon is completely vented in a well-ventilated area or in the open air. Ignoring this rule may result in serious injury to the eyes or respiratory tract due to the sudden expansion of the gas and its chemical effects.
Design features of the compressor and metal content
The refrigerator compressor is a sealed unit, inside which a complex mechanical and electrical part is hidden. The main mass of the unit is steel case, which serves as a reservoir for oil and protects internal mechanisms from external influences. It is steel that makes up the lion's share of the weight of the entire device, while copper is used mainly for the stator windings of the electric motor.
Inside the case there is a stator on which coils of copper wire are wound. The number of turns and the thickness of the wire determine the power of the motor and, accordingly, the volume of metal used. Some older Soviet-made models, such as ZIL or Saratov, used wire with thicker insulation and a larger cross-section, which increased the overall weight of copper compared to modern analogues.
In addition to the copper winding, the design contains elements made of aluminum, brass and steel. Aluminum parts are often found in heat exchangers and some parts of the rotor, but in the motor itself their share is minimal. Brass can be used in valve groups and connecting fittings, which also have scrap value, but their weight is negligible.
Why does the weight of copper differ between models?
The difference in weight is due to technological progress. Older motors were less efficient and required more copper to create the required magnetic field. Modern motors use higher quality magnetic cores and optimized winding geometry, allowing the consumption of expensive materials to be reduced without loss of performance.
It is worth noting that trying to determine the exact weight of copper “by eye” without opening the case is almost impossible. Different manufacturers use different winding patterns and assembly layouts. Therefore, any tables with weights are averaged and are for reference only.
Comparative analysis of copper yield in different models
For a more accurate understanding of the situation, it is useful to refer to statistical data collected during the disposal of various household appliances. The weight of copper in the compressor depends not only on the dimensions of the refrigerator, but also on the type of refrigerant and the era of production. Below is a table showing the approximate copper content depending on the type of equipment.
| Equipment type | Year of manufacture (approximate) | Compressor weight (kg) | Copper output (kg) |
|---|---|---|---|
| Single-chamber refrigerator | 1980-1990 | 9-11 | 0.8 - 1.1 |
| Double-chamber refrigerator | 1995-2005 | 10-12 | 0.7 - 0.9 |
| Modern No Frost | 2010-2020 | 8-10 | 0.5 - 0.7 |
| Industrial display case | Any | 15-20 | 1.5 - 2.2 |
As can be seen from the data, older and larger models contain more valuable metal. However, the weight of the compressor itself is higher, which complicates transportation and primary processing. Modern inverter models may have an even lower copper yield due to the use of rare earth magnets in the rotor design, which changes the very principle of operation of the motor.
When evaluating scrap, it is important to take into account not only pure copper, but also the presence of brass in the tubes. Receivers can sometimes value the entire compressor at a higher price if it is not damaged and can be used for repairs rather than just being melted down. In this case, the question how many kg of copper inside fades into the background, since the functionality of the unit is valued higher.
Technology for safe disassembly of the compressor
If you are determined to extract the copper yourself, you will need a set of tools and adherence to a strict sequence of actions. The process begins by disconnecting the device from the electrical outlet and providing access to the compressor, which is usually located in a niche at the bottom of the back wall of the refrigerator. It is necessary to carefully disconnect all tubes and electrical contacts.
To open the case you will need a hacksaw or a grinder with a disk for cutting steel. Sealed casing it is made of durable steel, so it cannot be disassembled with ordinary tools. The cutting should be done carefully, trying not to damage the internal winding, so as not to confuse copper with other metals and not to contaminate it with shavings.
☑️ Preparation for disassembly
After removing the top cover of the casing, access is opened to the stator. It is in it that the desired copper winding is located. To remove it, it is often necessary to destroy the assembled core plates, since the wire sits tightly in the grooves and is covered with varnish. The use of force is inevitable here, but it is important to act prudently.
⚠️ Attention: When sawing the compressor housing, there may be oil mixed with refrigerant inside. Avoid contact of this mixture with skin and eyes as it may be toxic. Work only in a well-ventilated area or outdoors.
Some craftsmen recommend pre-annealing the stator in a fire or oven to burn off the insulation and varnish, after which the copper pours out on its own or is easily removed. However, this method is environmentally unsafe due to the release of caustic smoke from combustible insulation and requires compliance with fire safety measures.
Economic feasibility and the market for recyclable materials
Before starting disassembly, it is worth carrying out simple mathematical calculations. If the average copper yield is about 0.8 kg, and the price of copper scrap fluctuates, then the revenue per compressor will be small. Electricity costs for operating an angle grinder, tool depreciation and time spent can exceed potential income.
The feasibility of independent copper mining appears only when processing large quantities of equipment, for example, a whole truck of old refrigerators. In this case, process optimization and the availability of specialized equipment allow metal to be recovered quickly and in large volumes. For one or two refrigerators, it is more profitable to hand over the entire compressor or sell used equipment in working condition.
It is also worth considering that metal collection points may value copper differently depending on its purity. A winding with residual varnish, insulation or solder will cost less than a clean burnt one. Therefore, the degree of purification of the metal directly affects the final amount you receive.
Environmental aspects of recycling equipment
Recycling of refrigerators is not only a matter of extracting non-ferrous metals, but also an important environmental task. Refrigerants circulate within the system, many of which are ozone-depleting substances or potent greenhouse gases. Improper release of freon into the atmosphere is harmful to the environment.
In addition, the compressor oil that remains inside the casing is a petroleum product and requires special disposal. Pouring oil into the soil or sewer is strictly prohibited. When disassembling yourself, it is necessary to provide containers for collecting technical fluids and their subsequent transfer to specialized organizations.
⚠️ Attention: The legislation of many countries regulates the disposal of household appliances. Disposing of refrigerators in regular trash containers may result in penalties. Use official collection points or specialized services.
Modern recycling facilities are equipped with equipment that allows you to safely recover freon and oil, as well as sort different types of metals and plastics. By contacting such organizations, you contribute to preserving the environment and ensure the return of resources to the production cycle.
Frequent errors during evaluation and disassembly
One of the common mistakes is confusion between copper and brass. The tubing coming from the compressor is often copper-plated steel or brass, which looks similar but costs less. When estimating weight, this can lead to incorrect expectations regarding profit.
Another mistake is trying to disassemble the compressor without removing the pressure. Even in a refrigerator that has been turned off and stood for several years, residual refrigerant pressure may remain. Opening the housing abruptly may cause a popping sound or flying fragments if an explosive mixture of gases has formed inside.
Inexperienced craftsmen often damage the winding so that a lot of steel shavings from the core get into the copper. It is extremely difficult to clean copper from small steel shavings, and such scrap will be accepted at a minimum price as a “mix”. Carefulness when working with a tool directly affects the quality of the resulting raw material.
Is it possible to determine the amount of copper without opening it?
It is impossible to accurately determine the amount of copper without opening it. You can only approximately estimate the weight, knowing the model of the compressor and the year of its manufacture, based on reference data. X-ray analysis is not used at home due to complexity and cost.
Is the gas inside an old compressor dangerous?
Yes, it is dangerous. Old refrigerators may use R12 freon, which, when in contact with fire, forms phosgene, a chemical warfare agent. The gas also displaces oxygen, which can lead to suffocation in a confined space.
What to do with oil from the compressor?
The oil must be collected in a sealed container (plastic bottle or canister) and taken to a waste oil products collection point. Pouring it into the ground or sewer is prohibited by environmental regulations.
Does it make sense to disassemble an inverter compressor?
There is a point, but the technology is different. Inverter motors often have copper windings, but their design is more complex and sealed. Disassembly requires more time and effort, and the copper yield can be comparable to conventional models.
Which tool is best suited for cutting?
It is best to use an angle grinder (grinder) with a metal disc. A hacksaw will require too much time and physical effort, and hydraulic shears may not cope with the thickness of the steel of the body.