The question of the content of non-ferrous metals in household appliances often arises not only among enthusiasts, but also among those who plan to recycle old unit. Electric motor of a refrigerator, or rather its compressor, is the main source of copper in the device. Many people mistakenly believe that kilograms of valuable metal are hidden inside a massive black tank, but the reality is dictated by the laws of physics and engineering.
In fact, the weight Cu (chemical designation of copper) in the motor-compressor varies depending on the year of manufacture, manufacturer and power of the unit. Modern models are becoming more and more economical, which often means reducing the amount of materials used. To understand whether the game is worth the candle, you need to disassemble the design and consider weight characteristics in more detail.
It is worth noting right away that it is almost impossible to remove metal at home without damaging the equipment. Sealed housing it was created for a reason - it retains freon and oil under pressure. If your goal is curiosity or an accurate calculation for scrap delivery, then the data below will help you form a realistic idea of the contents of the “heart” of your refrigerator.
⚠️ Attention: Opening the compressor with a grinder or a hacksaw is strictly prohibited in residential premises without special equipment for pumping out the refrigerant. Residues of freon can be toxic or ignite upon contact with a spark.
The design of the motor-compressor and the arrangement of the windings
To understand exactly where the copper is located, you need to look inside the device. Motor-compressor It is a sealed unit in which the electric motor and the pump part are located in a single housing. The engine is located in the lower part and is immersed in oil, which provides lubrication and cooling of the rubbing parts.
The bulk of the copper consists of the stator windings. This copper wireis coated with varnish, which is wound on a core made of electrical steel. It is here that an electromagnetic field is created that rotates the rotor. Modern inverter models use thinner wire and a complex winding pattern, which can affect the final weight of the non-ferrous metal.
The rotor, in turn, can also contain copper elements, but its bulk is steel and aluminum. Contact groups and the starting relay, located outside, also contain a small the amount of copper in the form of contacts and coils, but their contribution to the total weight is insignificant compared to the stator.
Why are the windings black?
The stator windings are coated with a special dielectric varnish. This protects the copper from moisture, oil and vibration. When insulation is burned (which is done by illegal buyers), up to 5-10% of the mass is lost, and the metal itself oxidizes and loses value.
Factors influencing the weight of copper in the compressor
There is no single figure that would be suitable for all refrigerators. Weight of copper directly depends on several technical parameters that have changed for decades. Old Soviet refrigerators, such as ZIL or Saratovoften had more massive windings due to less efficient magnetic alloys of the time.
Engine power is a key factor. The higher the power, measured in horsepower or watts, the thicker and longer the wire is used. Engine efficiency also plays a role: modern A++ class motors require less material to produce the same cold thanks to the improved geometry of the magnetic circuit.
The country of origin and year of manufacture make their own adjustments. Chinese compressors of recent years may have a smaller safety margin and, accordingly, less copper than their European counterparts Danfoss or Secop past decades. The type of refrigerant also affects: the transition to more efficient freons made it possible to reduce the size of the compression chambers and the motors themselves.
- 🏭 Year of production: Models before 2000 usually contain more non-ferrous metal.
- ⚡ Power: Motors from 200 W have more massive windings than 100-watt analogs.
- 🌍 Assembly region: European standards often require a longer resource, which means more materials.
Accurate calculation: table of copper content by model
Engineering measurements and data from scrap collection points allow you to create an approximate table of the dependence of the weight of copper on the type of compressor. It is important to understand that the figures are averages, since technological tolerance during winding they may vary.
The table shows data for the most common types of motors. The weight is indicated for pure copper after removing insulation and steel, although in practice it is often delivered mixed with varnish residues.
| Compressor type / Power | Approximate weight of copper (g) | Percentage of total weight | Typical models |
|---|---|---|---|
| Low power (up to 100 W) | 80 - 120 g | ~1.5% | Minibar refrigerators, old "Snipe" |
| Medium power (100-150 W) | 150 - 240 g | ~2.0% | Atlant, Indesit, Beko (standard) |
| High power (150-250 W) | 250 - 350 g | ~2.5% | Two-compressor systems, old ZIL |
| Inverter (linear) | 180 - 280 g | ~1.8% | LG, Samsung (modern) |
As can be seen from the data, even in the most severe case we are rarely talking about kilograms. Average weight copper in a standard household refrigerator is about 200-250 grams. This is less than many imagine when looking at the overall black tank.
Economic feasibility of dismantling
Considering an old refrigerator as a source of income from the delivery of non-ferrous metals is a dubious idea. Even if you collect copper from all components, including heat exchanger (radiators) and wiring, the amount of revenue is unlikely to cover the costs of tools and time.
The cost of copper scrap fluctuates, but even at high prices, 200 grams is pennies. In addition, collection points often lower the price of “burnt insulation” (burnt insulation) or require cleaning from foreign impurities. Aluminum tubeswhich are often confused with copper, are much cheaper.
If you have access to dozens of pieces of equipment, for example, when dismantling an apartment building before demolition, then the total volume may make sense. In a single case, it is more profitable to hand over the entire refrigerator as ferrous scrap or put it on the bulletin board if it is still working.
⚠️ Attention: Prices for scrap non-ferrous metals change daily. Before delivery, be sure to check the current prices at the nearest collection point, since tariffs may depend on the purity (purity) of the metal.
Technical nuances and types of copper
Electric motors do not use pure copper in the form of ingots, but special alloys with high conductivity. Most often these are brands M1 or M0. The wire is covered with enamel insulation, which is removed thermally or chemically during processing.
Unlike wiring in walls, where soft annealed copper is used, a more rigid wire is used in motor windings to maintain the shape of the coil during vibrations. Melting point copper is high, which allows engines to operate in hot conditions, but at the same time the steel shell of the compressor heats up much more.
- 🔌 Conductivity: Copper is selected for minimal resistance, which reduces energy losses.
- 🛡️ Corrosion: Inside the compressor, copper is protected by oil, but on the outside it quickly oxidizes, becoming covered with patina.
- ⚖️ Density: The high density of copper (8.9 g/cm³) makes the stator a heavy part of the engine.
Alternative use and disposal
Instead of disassembling a serviceable but old compressor, it can be given a second life. Craftsmen use motor-compressors to create homemade spray guns, vacuum pumps or compressors for aerating aquariums.
If the equipment is completely out of order, it is best to take it to a specialized recycling center. There electronic components and freon will be professionally neutralized, and the metals will be sent for smelting without harm to nature.
Modern processing plants use crushing complexes and magnetic separation, which makes it possible to extract up to 98% of materials. At home, such efficiency cannot be achieved, and the risk of injury or poisoning by freon vapors is very high.
☑️ Action plan with an old refrigerator
Is it possible to extract copper with a magnet?
No, copper is diamagnetic and is not attracted by a magnet. However, the steel compressor housing and stator core are magic