The question of how much copper is contained in the engine (compressor) of a refrigerator most often arises among those who plan to hand over faulty equipment to non-ferrous metal collection points or are trying to independently restore a failed unit. Copper winding The stator is the most valuable component of an electric motor, and its weight directly affects the final cost of the scrap being handed over. However, it is impossible to get an exact figure “by eye”, since manufacturers use different winding technologies and materials.
It is important to understand that modern compressors are significantly different from old Soviet models. If earlier the weight of the engine was determined by a massive core and thick wire, today engineers are striving for energy efficiency and miniaturization. This led to changes in the composition of the alloys and the design of the windings. In this article we will look in detail at what the amount of copper depends on, how to extract it and whether the game is worth the trouble.
To begin with, it is worth noting that the compressor is a sealed unit, and you can’t just look inside. Weight of copper varies depending on the engine power, year of manufacture and brand manufacturer. Some companies are introducing aluminum windings with copper coating, which significantly reduces the weight of the precious metal, but leaves the technical characteristics at an acceptable level.
The design of the compressor and the location of copper
To understand exactly where the desired metal is located, you need to consider the internal structure asynchronous motor. The bulk of the copper consists of the stator winding, which is wound on a metal core. It is this part that creates the electromagnetic field that rotates the rotor. Classic models use pure copper wire with varnish insulation, which fits into the stator grooves.
In addition to the main winding, the motor may contain additional elements containing non-ferrous metals. For example, the starting winding is often made of thinner wire. Copper is also contained in the lead contacts and sometimes in the connecting bars inside the casing, although their weight is negligible compared to the stator.
⚠️ Attention: Inside the compressor there is oil and refrigerant under pressure. You can open the housing with a grinder or a hacksaw only after complete removal of freon and oil, observing safety precautions.
There is also the concept of the “frontal part” of the winding - these are the protruding parts of the turns that do not fit into the grooves of the core. When mechanical cutting, these areas are often cut first. The number of turns and the thickness of the wire determine resistance the power of the motor, which directly correlates with the weight of the raw materials used.
Why do manufacturers change the composition of the windings?
Modern requirements for energy efficiency (class A++ and higher) force engineers to use higher quality grades electrical steel for the core, which allows you to reduce the number of turns of copper without loss of power. In addition, the volatility of prices on the metal exchange forces us to look for compromise solutions, such as bimetallic wires.
Factors influencing the weight of copper in different models
There is no single standard regulating how many grams of copper should be in one kilowatt of power. Weight depends on many variables. First of all, these are year of production techniques. The old ZIL or Biryusa refrigerators of the 70-80s were famous for their reliability precisely due to the huge supply of copper in the windings, which made them heavy and durable.
The second important factor is the type of compressor. Inverter models that currently dominate the market may have a different motor design compared to classic linear compressors. Inverters often use permanent magnet motors, where the winding design is optimized to work with frequency converters.
- 🏭 Brand manufacturer: European brands (for example Electrolux, Bosch) have historically used more copper than some budget Asian counterparts, although in the last 10 years the trend towards standardization of materials has become global.
- ⚡ Power and volume: A compressor for a two-chamber refrigerator with a volume of 300 liters will contain more copper than a motor for a compact minibar.
- 📉 Economic feasibility: With a sharp rise in copper prices, manufacturers can switch to aluminum alloys, maintaining engine dimensions the same.
It is also worth considering that some modern models use technology aluminum winding with copper deposition. Visually, such a wire may look like copper, but when cut or when the insulation is burned, the white color of aluminum becomes visible. The weight of such an engine will be significantly less, and the value for scrap will be lower.
Average indicators: copper weight table
Although the exact weight can only be found out after disassembling and weighing, experience recycling centers allows you to display average values. Below is data that will help you figure out how much non-ferrous metal can be obtained from a motor of a certain power.
The actual yield of copper depends on efficiency (efficiency) of the specific motor and winding technology. The table shows the values for classic copper windings.
| Compressor type / Power | Total motor weight (kg) | Approximate weight of copper (kg) | Percentage content (%) |
|---|---|---|---|
| Low power (up to 100 W) | 5.0 - 6.0 | 0.4 - 0.6 | ~10% |
| Medium power (100-200 W) | 7.0 - 9.0 | 0.8 - 1.2 | ~12-13% |
| Powerful (for large cameras) | 10.0 - 12.0 | 1.3 - 1.6 | ~13-14% |
| Soviet models (old) | 10.0 - 14.0 | 1.5 - 2.0 | ~15% and higher |
As can be seen from the table, the percentage of copper rarely exceeds 15% of the total mass of the unit. The rest is steel, cast iron, oil and refrigerant. Therefore, by handing over the entire compressor as “black scrap” or “mix”, you lose a significant part of the profit, since copper is valued much higher.
⚠️ Attention: When handing over scrap, collection points often underestimate the percentage of copper content, considering the engine “stale” or “burnt out”. Knowing the exact weight will help you reasonably demand a fair price.
Technology for extracting copper from the stator
If you decide to extract copper yourself, you will need a set of tools and compliance with safety measures. The extraction process is called "fluffing" or "burning out". The first method is more labor-intensive, but allows you to preserve the quality of the metal, the second is faster, but worsens the condition of the wire.
For mechanical removal, you need to remove the back cover of the compressor (or cut off the top of the housing) to gain access to the stator. Then, on one side of the winding, the frontal parts of the turns are cut off with a hacksaw or grinder. After this, the copper bundle is knocked out from the opposite side with a heavy hammer or pulled out with a hook.
☑️ Tools for disassembly
The burning method involves heating the stator in a fire or oven to the melting temperature of the varnish isolation and combustion of organic residues. However melting point copper is 1083°C, and if you overheat it, the metal can oxidize or even melt, reducing its value. In addition, when the varnish burns, toxic substances are released.
The most effective method is considered to be a combined method: cutting off one side and subsequent heating to facilitate extraction. It is important not to damage the stator package itself if you plan to use it for rewinding, although for recycling purposes this does not matter.
Economic feasibility and scrap market
Is the game worth the candle? To answer this question, you need to compare labor costs and potential profits. The weight of copper in one compressor rarely exceeds 1.5 kg. Even with a high price per kilogram of non-ferrous metal, you can’t get much out of one engine.
However, if you have accumulated a batch of 10-20 old refrigerators, the total weight of copper can be 15-20 kilograms, which is already of interest to collection points. In this case, it makes sense to engage in separation (separation) of materials yourself.
The market dictates its conditions: collection points are more willing to buy “burnt copper” (copper stripped of insulation) than assembled windings. But the price of a burnt metal is higher only if the metal is really pure. The presence of burnt marks, oxides or varnish residues can reduce the category of scrap.
- 📉 Price dynamics: Prices for non-ferrous metals are constantly fluctuating. Before you start disassembling a large batch, check the current quotes on exchanges or local acceptance offices.
- 🏭 Logistics: Transportation of heavy refrigerator cases can be more expensive than the cost of the copper received. It is often more profitable to remove copper on site, leaving heavy black scrap.
- ⚖️ Honesty of receivers: At collection points they may use uncalibrated scales or determine the copper content “by eye”. Having accurate scales at home will help you avoid being scammed.
⚠️ Attention: The legislation of many countries requires a license to collect and procure non-ferrous metals. Selling a small amount of scrap from your own equipment by individuals is usually allowed, but wholesale purchasing can be regarded as illegal business.
Alternative uses and recycling
If you do not plan to scrap copper, it can be useful on the farm. Purified copper wire is an excellent conductor and can be used to make homemade transformers, chokes or induction heaters. Electrical conductivity Copper remains high even after recycling.
Old compressors are often converted into air compressors for garage needs (pumping tires, airbrushing). In this case, the contents of the engine do not matter, the main thing is the serviceability of the mechanical part. However, if the engine burns out, its copper will still have to be removed for replacement or disposal.
Modern recycling technologies make it possible to use crushed scrap to produce high-purity cathode copper. Therefore, even by handing over a “burnt” or winding, you contribute to the cycle recyclingwhich is environmentally more justifiable than burying equipment in a landfill.
What do they do with aluminum windings?
Aluminum also is a valuable non-ferrous metal, but it costs less than copper. When melting, it is important to sort these metals, since their alloys have different properties. Mixing copper and aluminum in one boiler will result in a defect.
Frequently asked questions (FAQ)
Is it possible to determine the presence of copper without disassembling the compressor?
It is impossible to accurately determine the weight, but you can indirectly estimate the presence of copper by the weight of the compressor itself and the year of manufacture. Heavy Soviet models are almost guaranteed to have copper winding. Lightweight modern models (less than 6 kg) are more likely to contain aluminum or its alloys. You can also check the conductivity: copper has less resistance than aluminum of the same length and cross-section, but an accurate test requires an ohmmeter and access to the terminals.
How much does 1 kg of copper from an engine cost in 2026-2026?
The price of copper scrap is constantly changing and depends on the region, category of scrap ("burner", "mix", "winding") and exchange rates. At the time of writing, the price can vary from 500 to 700 rubles per kilogram (for example). The current cost should always be checked at the nearest collection points, as they can change conditions daily.
Is it dangerous to burn insulation from a copper wire?
Yes, it is dangerous. When burned, varnish insulation and rubber gaskets emit toxic and carcinogenic substances. In addition, when exposed to high heat, copper oxidizes, forming a coating that reduces the quality of the metal and its return value. It is better to use a mechanical method of stripping the insulation or specialized machines.
Is there a price difference between copper from a refrigerator and a copper pipe?
Yes, the difference is significant. Copper pipe (for example, from an air conditioner or water supply) is valued higher, since it is almost pure metal without impurities and insulation. The motor winding is considered lower grade scrap ("winding wire"), since it requires additional cleaning to remove varnish and takes up more volume for the same weight. The price for a winding is usually 20-30% lower than for a pipe.
What to do if the engine contains not copper, but aluminum?
Aluminum winding can also be taken to collection points for non-ferrous metals, but the price for it will be much lower (about 3-4 times cheaper than copper). It is not necessary to sort them if you are handing over a small quantity, but large receptions may ask you to separate these metals, since their melting technologies are different.