Search electric motor in the design of a household refrigerator is the first step that the owner takes when faced with a loud hum, a failure of equipment to cool food, or a desire to carry out preventive maintenance. Many people mistakenly believe that the motor is located inside the camera, like a fan in a computer, but in classic models this unit is hidden from the user’s eyes. Understanding its exact location is critical for correct diagnosis of malfunctions and ensuring safety during any manipulation.
In the vast majority of modern and old models of refrigeration units compressor-condensing unit, inside which the engine itself is mounted, is located in the lower rear part of the housing. It is there that all the mechanics are concentrated, ensuring the circulation of refrigerant throughout the system. Knowing this design feature allows you not to waste time disassembling the interior of the freezer or door shelves, where the motor simply cannot be.
Access to this unit is often limited to a decorative panel or a metal casing that protects the mechanism from dust and accidental damage. Before you begin any work, you must understand that you are dealing with high voltage equipment containing a pressurized system. Improper handling of components can lead to injuries or permanent failure of the equipment.
Design features of the compressor
The electric motor of a refrigerator is not a separate part that can simply be removed, like a battery. It is sealed unitsealed in a durable black metal casing. Inside this “pot” there is the motor itself, a piston group and valves operating in an oil environment. This design is called a hermetic compressor, and it eliminates the possibility of simply repairing the windings at home.
The location of the motor inside the casing is dictated by the need to reduce noise levels and prevent refrigerant leaks. The motor shaft is directly connected to the pistons, so vibration is transmitted to the entire compressor housing. To compensate for these vibrations, special springs or rubber shock absorbers are used, on which the mechanism inside the casing is suspended.
⚠️ Attention: It is strictly forbidden to open the sealed compressor casing yourself. There may be freon inside under residual pressure, and oil vapors are toxic. In addition, a violation of the tightness makes further operation of the unit impossible without expensive factory soldering and refilling.
Electrical wires and copper pipes of the circulation system approach the casing from the outside. The electrical part includes starting and protective relays, which are often attached directly to the terminals of the motor windings. It is these external components that most often become the object of attention when searching for the causes of a breakdown.
The exact location of the motor in different types of refrigerators
Although the operating principle is the same for all refrigerators, the layout of the components may differ depending on the type of design. In classic two-chamber models with one door or system No Frost, the compressor is almost always located in a niche in the lower part of the rear wall. It is covered with a metal sheet that is secured with latches or screws.
In side-by-side models or built-in appliances, the situation may be more complicated. Here the compressor is also located below, but access to it may be limited by the kitchen body or by the tight fit of the equipment to the wall. In some modern models with inverter motors, manufacturers may change the location to optimize space, but the bottom of the rear panel remains standard.
There are also industrial or specialized refrigerators, where the layout can be remote, but in the household segment the “bottom-to-back” rule works in 99% of cases. If you cannot find the compressor, inspect the base of the device - sometimes it is hidden behind a decorative grille at the front, although this is rare for modern household models.
Visual identification of components
Once you have reached the rear bottom of the refrigerator and removed the protective cover (if there is one), a complex mechanism will appear before you. How to distinguish an electric motor from a capacitor or other tubes? The main feature is a massive black “cylinder” of cylindrical or spherical shape.
Copper tubes of different diameters are suitable for this cylinder. One of them, usually thinner, leads to the condenser (grid at the back), the other, thicker, goes to the evaporator. The electrical cable fits into a plastic or bakelite box attached to the side or top of the compressor casing - this is the starting relay.
| Component | Appearance | Function | Location |
|---|---|---|---|
| Compressor casing | Black metal cylinder | Mechanism and oil protection | Center of niche below |
| Start relay | Plastic box on the side of the motor | Starting the engine | At the compressor terminals |
| Condenser | A thin tube coil | Gas cooling | Back or on the sides |
| Fan | Plastic impeller | Blowing the condenser | Next to the compressor |
Important not confuse the compressor with the condenser radiator, which is a lattice of curved tubes, often painted black. A compressor is precisely a “barrel” that vibrates during operation. If the equipment is turned off, it will be cold and quiet, but it is not difficult to distinguish it by its shape.
Signs of a faulty electric motor
Understanding where the motor is located is necessary for diagnosis. If the refrigerator has stopped freezing, but the light inside is on, the problem often lies in this unit. One of the main symptoms is a characteristic click that repeats every few minutes, followed by silence.
This means that starting relay it is trying to start the motor, but the windings do not work, or the motor itself is jammed. In this case, the compressor may hum or jerk slightly, but will not start. If you touch the casing (carefully, it may be hot), it will be warm, although the refrigerator itself is at room temperature.
Another sign is the constant operation of the motor without turning off. If the refrigerator hums for days without turning off, and a “coat” of ice forms inside, this may indicate a loss of performance of the piston group. The motor runs, but does not create the necessary pressure for effective cooling.
⚠️ Attention: If you hear a loud knocking, grinding or squealing sound when the compressor is running, immediately unplug the appliance. These sounds indicate mechanical destruction of internal components, and further work will lead to complete failure of the system.
Safe diagnostic algorithm
Before proceeding with any actions, it is necessary to turn off the power to the refrigerator. Unplug the cord from the outlet. This is an axiom, violation of which can cost lives. Even if it seems to you that you are only checking visually, accidentally touching the contacts when the power is on is unacceptable.
Next is a visual inspection. Check the integrity of the wires going to the compressor. Are there any melts, traces of rodents or oxidation of contacts? Often the problem lies not in the engine itself, but in the oxidized contact in the start relay.
☑️ Check before calling a technician
If everything is visually intact, you can carefully (after complete cooling, if it was working) rock the compressor. It should not hang like a pear on a tree, but slight movement on shock absorbers is acceptable. If you hear a clear metallic clang inside the casing when the device is turned off, this is a bad sign - the motor suspension is damaged.
Nuances of the operation of inverter motors
Modern models are increasingly found inverter compressors. Outwardly, they may look the same as classic ones, but they often have a more streamlined shape and are mounted at the bottom rather than on springs. The main difference is in the nature of the work: they do not make loud clicks when starting, but smoothly pick up speed.
Diagnostics of such engines is more difficult, since an electronic control unit located separately from the motor is responsible for their operation. If the inverter refrigerator does not turn on, the problem may not be in the “pot” itself, but in the electronics board that sends a signal to start.
The cost of replacing an inverter motor is much higher than a conventional one, so accurate diagnosis is critical here. An error in identifying a fault can lead to the purchase of an expensive part that will not solve the problem if the control board is burned out.
When you need to call a specialist
You can find the motor yourself, clean the capacitor from dust, check the integrity of the wires and even replace the starting relay if you have the skills to work with electricians. However, there are situations when non-professional intervention is prohibited.
If required replacing the compressor, you cannot do without the services of a master. This process includes: bleeding off the remaining freon, soldering the copper tubes, installing a new motor, evacuation of the system (removing moisture and air) and filling with refrigerant strictly by weight.
An attempt to simply “re-solder” the tubes without a vacuum sealer will result in moisture remaining in the system. During operation, it will freeze in the capillary tube, clog the system, and the new compressor will burn out in a few days or weeks. Savings on calling a technician in this case will result in the purchase of a new refrigerator.
⚠️ Attention: Repairing the refrigerant circulation system requires a license and special equipment. Independent soldering without following vacuum technology is guaranteed to permanently damage the equipment.
Frequently asked questions
Is it possible to lubricate the electric motor of a refrigerator if it begins to make noise?
No, lubrication of the electric motor inside the sealed casing is impossible without opening it, which is an irreversible procedure. If the bearing inside the motor is noisy, the compressor must only be completely replaced. You can only lubricate the external blower fan, if the model provides for it, but the motor itself cannot.
Why is the motor hot, but the refrigerator does not freeze?
This indicates that the compressor is working, but the circulation of freon is impaired. Possible causes: gas leak, blockage in the capillary tube or loss of compression (wear of the piston group). The engine heats up from constant operation and gas compression, but there is no cold.
How much does it cost to replace an electric motor?
The cost consists of the price of a new compressor and the work of a technician. Depending on the refrigerator model and region, the price may vary. The exact amount can only be found out after diagnostics, since the price of spare parts can differ significantly for different brands.
Is a new refrigerator louder than an old one?
Modern refrigerators are usually quieter than old Soviet models due to improved sound insulation of the compressor casing and the use of more advanced motors. However, if the humming appears suddenly or its character changes, this is a reason to check.
Is it possible to restore a burnt-out compressor?
In domestic conditions - no. Rewinding the windings of a hermetic compressor is not economically feasible and technically difficult. It is cheaper and more reliable to buy a new unit. There are services that offer overhaul, but their service life rarely exceeds several months.