How much copper is in the refrigerator motor: weight, content and price

The question of how much copper is contained in the compressor of an old refrigerator often arises among those who plan to scrap household appliances. Non-ferrous metals are valued at collection points much higher than black steel or aluminum, so accurate knowledge of the composition of the assembly helps not to get into trouble when weighing. Many people mistakenly believe that the entire engine consists of pure metal, but the reality is dictated by the engineering design features.

In fact, a significant part of the volume is occupied by steel case, aluminum windings (in budget models) or varnish coating, which significantly reduces the yield of pure product during processing. The weight of the unit itself can vary from 6 to 12 kilograms, but the share of useful metal in it is only a part of the total mass. Understanding this difference is critical to assessing the profitability of disassembly.

It is worth considering that modern trends in the production of household appliances are aimed at saving resources, which leads to a reduction in the use of expensive materials. If you are holding an old Soviet unit in your hands, the chances of finding more copper there are higher than in the Chinese equivalent of the 2020s. Let's look at the details so that you can accurately evaluate the “golden reserve” of your old refrigerator.

Design features of the compressor

Sealed compressor is a complex mechanism where the electric motor and piston group are enclosed in a welded steel casing. It is this outer shell that makes up the lion's share of the device's weight, protecting the internal components from moisture and mechanical damage. Inside this sealed “bunker” there is the engine itself, which is of interest for the extraction of non-ferrous metals.

The main element containing non-ferrous metal is stator the stationary part of the electric motor. It consists of a set of metal plates, in the grooves of which the winding is laid. It was this winding in the classical design that was made of copper, which has excellent electrical conductivity. However, the rotor, the rotating part, is often made of steel or aluminum, which must be taken into account when making calculations.

⚠️ Attention: Opening the sealed compressor housing with an angle grinder or a hacksaw is strictly prohibited without first pumping out freon and oil, since refrigerant residues can be flammable or toxic, and oil vapors when heated cutter form an explosive mixture.

In addition, the design contains Pipelines (discharge and suction), which are also made of non-ferrous metal, but their weight is insignificant compared to the mass of the windings. The cooling system also plays an important role, which in household models is often implemented through natural convection of air around the casing, without adding copper, but increasing the dimensions.

Copper versus aluminum: the evolution of windings

Historically, refrigerator electric motors were equipped with exclusively copper winding. This ensured long service life, overload resistance and high efficiency. However, in pursuit of cheaper production, starting from the late 90s - early 2000s, many manufacturers switched to using copper windings. aluminum wire. Aluminum is lighter and cheaper, but its electrical conductivity is lower, and its mechanical strength is significantly inferior to copper. Such motors are more sensitive to voltage drops and fail more often. For the person selling scrap metal, this means that instead of the expected expensive scrap, he will receive cheap aluminum, which is accepted at the tariffs of black or light non-ferrous metal. aluminum wire.

Aluminum is lighter and cheaper, but its electrical conductivity is lower and its mechanical strength is significantly inferior to copper. Such motors are more sensitive to voltage drops and fail more often. For the person selling scrap metal, this means that instead of the expected expensive scrap, he will receive cheap aluminum, which is accepted at the rates of ferrous or light non-ferrous metal.

How to distinguish copper from aluminum visually?

Copper has a characteristic reddish-pink tint when cut or chipped. Aluminum - silver-white. Copper is also much heavier: a piece of copper wire of the same volume will weigh about 3 times more than aluminum.

It is almost impossible to determine the winding material without opening it, but there are indirect signs. Compressor weight with copper winding it is usually larger than that of an aluminum counterpart of similar dimensions. Also, old models produced before 1995 are almost guaranteed to contain copper, while in modern budget refrigerators the probability of finding aluminum tends to 90%.

The actual weight of copper in different models

The amount of copper directly depends on the engine power and the year of manufacture of the equipment. On average, the pure metal content ranges from 10% to 20% of the total mass of the compressor. For example, a heavy Soviet unit can weigh 11 kg, of which the useful output will be about 1.5–2 kg, while a light modern “Chinese” weighing 7 kg will give no more than 0.6–0.8 kg, and only if you are lucky with the winding material.

Below is a table showing the approximate copper content in popular types of compressors found on the secondary market. The data are averaged, since manufacturers often change technical regulations without changing external markings.

As can be seen from Tables inverter compressorsdespite their complex design still often contain copper, but their disassembly requires a special approach due to the presence of powerful magnets and electronics. The highest concentration of valuable metal is observed in old twin-motor systems, which are now rare.

Technology for extracting non-ferrous metals metal

The process of extracting copper from a electric motor refrigerator is a labor-intensive operation that requires compliance with safety precautions. The first step is always to disconnect the compressor from the refrigeration system and drain the technical oil, which contaminates the scrap and reduces its value. The oil must be drained into a separate container and handed over as waste petroleum products.

Next follows mechanical opening of the housing. For this, an angle grinder (grinder) with a metal disc is used. Cutting it is performed along the circumference of the weld. It is important not to damage the internal winding by excessive heat, although this is not as critical for scrap as it is for restoration. After removing the cover, access to the stator opens.

The most difficult stage is separating the copper from iron core. The winding is tightly stuffed into the grooves and filled with varnish. To extract the metal, the winding often has to be burned out or knocked out. Burning gives a quick result, but reduces the quality of scrap due to oxidation and burning residues, so collection points can lower the price for “burnt” copper.

The influence of the year of manufacture on the value of scrap

The year of manufacture of the refrigerator is a key factor determining whether it is worth it at all bother with disassembly. Equipment produced in the USSR and in the first decade after its collapse is considered a “gold mine” for scrap metal collectors. In those days, quality standards required the use of reliable materials, and savings on windings were not practiced.

Starting from 2005-2010, the situation has changed dramatically. The globalization of markets has led to the dominance of Asian manufacturers who have introduced technology aluminum winding. Even if the nameplate of a well-known brand (for example, Indesit or Beko) has a European name, the compressor itself can be produced in China using cheaper technology.

⚠️ Attention: You should not count on high profits from disassembling one refrigerator. The costs of tools, electricity and time often exceed the cost of the resulting metal if you do not have access to free raw materials and an established distribution channel.

Units for commercial use also stand apart. They are more powerful, more massive and are almost always equipped with motors with pure copper winding, regardless of the year of manufacture. If you have the opportunity to get such a device, its disassembly will be much more cost-effective. industrial refrigerators and units for commercial use. They are more powerful, more massive and are almost always equipped with motors with pure copper winding, regardless of the year of manufacture. If you have the opportunity to get such a device, disassembling it will be much more cost-effective.

Economic feasibility and prices

The secondary raw materials market dictates its prices, and they are constantly fluctuating. At the time of writing, the price of grade 1 copper scrap (burnt, lump) significantly exceeds the cost of electrical or mixed scrap. However, by handing over the winding along with the iron, you will get the price of “junk copper” or even aluminum, which is 3-4 times cheaper.

For example, if pure copper costs about 600-700 rubles per kg (conditional prices), then copper in the engine can be accepted for 200-300 rubles, and aluminum even at the price of ferrous scrap. Therefore cleaning quality directly affects the final earnings. The cleaner you separate the metal from the varnish and steel, the better the deal.

In addition, it is worth considering the cost of tools and consumables. Grinder wheels, safety glasses, gloves, oil containers are all expenses that need to be deducted from potential profits. In a garage recycling environment, profitability often depends on volume: it is profitable to recycle dozens of compressors at once, rather than one or two.

Environmental aspects of recycling

Disassembling refrigerators is not only a business, but also a responsibility to the environment. Freon circulates inside the system, which, when released into the atmosphere, destroys the ozone layer or enhances the greenhouse effect. When sawing the compressor, residual gas inevitably comes out, so professional recyclers use special stations for pumping out freon. refrigerant (freon), which, when released into the atmosphere, destroys the ozone layer or enhances the greenhouse effect. When sawing the compressor, residual gas inevitably comes out, so professional recyclers use special stations for pumping out freon.

Also (cannot be ignored) is the problem of used oil. It contains products of metal wear and refrigerant breakdown. Draining it into the sewer or onto the ground is strictly prohibited. Proper disposal requires handing over the oil to special collection points, which is also an expense or organizational difficulty.

Thus, “garage” recycling without observing environmental standards is harmful to the environment. Large recycling plants have filters and neutralization systems, which makes their operations safer, although less profitable for a private individual who rents out the entire equipment.

Comparison table for scrap characteristics

For a better understanding of the value of the various components of the refrigerator, consider a comparison table. It will help you navigate which parts of the unit you should pay special attention to when sorting.

As practice shows, it is the windingthat brings the main profit, while the steel case is sold like a black rusty can. Aluminum radiator (condenser) grilles in older models can also be valuable, but in modern ones they are often replaced with steel ones with painting.

Frequently asked questions (FAQ)

Exactly how many kilograms of copper can be obtained from one compressor?

On average, from one standard household compressor it is possible to extract from 0.5 to 1.2 kg of copper, if the winding is really copper. In models with aluminum winding, the copper output will be zero (only in tubes and leads).

Is it possible to determine the presence of copper by sound or vibration?

No, it is impossible to determine the winding material by ear. The only reliable way is to weigh the compressor (copper is heavier) or make a small cut/drill to visually inspect the color of the metal on the cut.

Will the entire compressor be accepted as non-ferrous metal?

Some collection points accept entire compressors under the category “electric motor” or “micromotor”, but the price per kilogram will be significantly lower, than for purified copper. They are often weighed as black steel with a coefficient.

Is the gas inside the compressor dangerous when sawing?

Yes, freon residues can be dangerous. When heated with an angle grinder, they can react with oxygen or oil, forming toxic compounds (for example, phosgene), so work should only be carried out in a well-ventilated area or outdoors.

Does it make sense to disassemble an inverter compressor?

Inverter compressors are more difficult to disassemble and often contain less copper as a percentage ratio, but they have powerful neodymium magnets, which can also be returned or reused, which increases the overall value of the unit.