How much copper is in the compressor from a refrigerator: weight, analysis and analysis

The question about the content of non-ferrous metals in household appliances often arises not only among those involved in professional recycling, but also among craftsmen planning to repair or replace unit components. The weight of the copper winding in the motor is a variable value that directly depends on the power of the unit, the year of manufacture and the specific model of the household appliance. On average, from one standard compressor you can get from 100 to 250 grams of pure non-ferrous metal after carrying out all extraction procedures.

However, you should not rely on average figures when planning work on recycling or restoring equipment, since the design of different manufacturers is radically different. Modern inverter models may contain less copper due to the use of other alloys and a different winding design, while old Soviet units were famous for their massiveness and high content of precious metals. Understanding the exact weight is necessary to assess the economic feasibility of dismantling.

In this article we will look in detail at how to correctly calculate the potential of a compressor, what tools will be required to safely open the housing, and why the weight of the finished product is not equal to the weight of useful copper. You will learn about the technical nuances that are hidden behind the steel casing, and receive comprehensive information about what exactly affects the final mass of the extracted material.

Factors influencing the amount of copper in the unit

The amount of copper in a refrigerator electric motor is not a fixed constant and depends on a number of engineering decisions applied by the manufacturer. The first and main factor is compressor power, which usually varies in the range from 100 to 250 Watts for household models. The higher the power required to circulate the refrigerant in the system, the thicker the cross-section of the wire and the more turns required to be placed in the stator slots, which directly proportionally increases the weight of the non-ferrous metal.

The second important aspect is the winding technology and the type of wire used. Older models from decades ago often used pure copper with minimal impurities, making them a valuable source of raw material. Modern manufacturers, in pursuit of reducing the cost and weight of the device, can use copper-plated aluminum alloys with high resistance, where the copper layer is only a thin coating. This significantly reduces the final weight of the precious metal during processing.

It is also worth considering the dimensions and energy efficiency class of the device. Units of class A++ and higher often have a more complex internal structure, where optimization of the magnetic field allows the use of less conductor while maintaining performance. However, in absolute numbers, large industrial or semi-industrial refrigeration units will always contain more copper than compact home refrigerators.

⚠️ Attention: The weight of the compressor assembly (about 10-12 kg) and the weight of pure copper inside it (about 150-200 g) differ by an order of magnitude. Do not focus on the mass of the entire device when assessing scrap yield.

Design features and weight of windings

To understand where the copper comes from, you need to look inside the sealed casing. The main consumer of non-ferrous metal is the stator of the electric motor, located in the lower part of the housing. It is here that the coils are wound, creating an electromagnetic field to rotate the rotor. The weight of these windings makes up the lion's share of the entire extracted reserve; the rest of the copper can be contained in the lead wires and contact groups.

The stator design is a set of metal plates pressed into a single core. An insulated wire is placed in the grooves of this core. The number of turns can reach several hundred per coil, and the total length of the wire in powerful models can be measured in kilometers. At the same time, section diameter wires also play a role: for powerful compressors, a thicker core is used, which increases the mass, but reduces heating during operation.

In addition to the stator itself, small amounts of copper can be found in the starting windings and in the connecting cables. However, trying to extract them separately does not make economic sense, since the labor costs will not be recouped by the resulting gram of metal. When recycling, the main attention should be paid to the main stator winding.

Table: Approximate weight of copper in popular models

For the convenience of assessing the potential yield of raw materials, we have compiled a summary table based on data from a technical analysis of popular brands of compressors. It is worth remembering that the numbers are averages, since within the same series there may be modifications with different characteristics. The exact weight can be found out only after weighing the extracted metal on an accurate scale.

As can be seen from the table, old Soviet units, such as Kiryusha or series models HC, contain significantly more copper compared to modern analogues. This is due to the use of more massive windings and the lack of desire for miniaturization, which is characteristic of modern technology. However, they weigh correspondingly more, which must be taken into account when transporting to the collection point.

Instructions: How to extract copper from a compressor

The process of extracting copper requires compliance with safety precautions and the availability of a certain set of tools. It will not be possible to simply shake the metal out of a sealed case - mechanical destruction of the steel shell will be required. Before starting work, make sure that the compressor is disconnected from the power supply and that the refrigerant is completely bled from the system, if there is any remaining there.

To start work, you will need an angle grinder with a metal disc, a powerful chisel, a hammer and pliers. The first step is to cut off the top cover of the casing along the weld seam. This must be done carefully, trying not to damage the internal windings, although for scrapping their integrity is not as important as the speed of operation. After removing the cover, access to the internals will open: the electric motor, piston group and valves.

The next step is to remove the stator with wound coils. Often it is fastened tightly enough that it has to be knocked out or cut out. To separate copper from iron, you can use the method of burning the insulation (which is environmentally unsafe and prohibited in many places) or mechanically cutting the wires. The most effective and clean method is to use heavy-duty wire cutters or cut the coils on one side of the core and pull out the wire bundles.

⚠️ Warning: Cutting through the frame will produce metal shavings and sparks. Be sure to use safety glasses and gloves to avoid injury and sawdust getting into your eyes.

Economic feasibility and disposal

Is the game worth the candle? Many people ask this question after watching videos about the “mining” of non-ferrous metals. Let's do the math. If the average copper yield is about 150-200 grams, and the price of first grade copper scrap fluctuates around 600-700 rubles per kilogram (figures may vary), then from one compressor you will receive approximately 100-140 rubles worth of raw materials. At the same time, the cost of a new compressor for repair amounts to thousands of rubles, and the cost of electricity and equipment if disassembled independently can exceed this amount.

However, if you have accumulated a collection of 10-20 old non-working units, recycling them can be a small but pleasant bonus. In addition, proper recycling is important from an environmental point of view: copper can be endlessly recycled without losing its properties, which reduces the need to mine new ore. The rest of the compressor housing is black steel, which is also accepted by scrap metal points, although it costs much less.

It is important to note that the compressor also contains technical oil, which absolutely cannot be drained into the sewer or onto the ground. This is a petroleum product that pollutes soil and water. When preparing for delivery or disassembly, collect the oil in a separate container and hand it over to special waste oil collection points.

Safety precautions when working with refrigeration equipment

Working with the insides of a refrigeration unit is associated not only with mechanical risks, but also with chemical ones. Inside the system there is a refrigerant, which can be in a gaseous or liquid state under pressure. Older models used R12 freon, which, when in contact with an open flame (for example, when cutting with a grinder), can release phosgene, a chemical warfare agent. Therefore, opening the compressor without making sure that there is no freon is strictly prohibited strictly prohibited.

It is also worth remembering the risk of electric shock if you check the performance of the compressor before disassembling. Even a capacitor disconnected from the network can retain a residual charge. Before picking up tools, close the contacts of the starting relay and capacitor with a screwdriver with an insulated handle to ensure that the circuit is discharged.

Use a respirator when working with winding insulation if you plan to burn it (which, again, is not recommended). Burning products from varnish and insulation materials are toxic and may cause respiratory irritation or more serious health effects. Take care of yourself and follow safety precautions.

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