Until recently, only linear compressors were installed in refrigerators. Today, many manufacturers of such refrigeration equipment are beginning to introduce inverter compressors, the principle of operation, the pros and cons of which you will learn further.
What is an inverter compressor?
This is a device with which you can adjust the speed value to obtain a sufficient amount of cold. If three compressors were previously installed in the refrigeration unit, then with this type of compressor, only one apparatus will be required. It turns on without overloads and power surges, during its operation energy is saved.
Inverter compressors generate alternating current, and it affects the rotation of the rotor. As soon as it enters the device, an alternating magnetic field is formed inside it, acting on the rotor, and not on the coils, the EMF is directed. Electromagnets appear inside the apparatus, which, when captured by a magnetic field, set in motion an asynchronous motor.
The principle of operation of the inverter compressor
A refrigerator with such a compress has the following principle of operation:
- After receiving a signal from the temperature sensor, the motor starts – the inverter compressor starts to work under the influence of the refrigerant.
- As soon as the required temperature is reached, the sensor sends a signal to stop working, but the engine does not completely stop, but reduces the intensity and speed of revolutions.
- The refrigerant circulation speed is reduced, but the system continues to cool, so the temperature in the refrigerator remains at the set point, neither falling nor rising.
- When a certain part of the air escapes when the door is opened, the temperature in the chamber rises, and the sensor sends a signal to the motor about the discrepancy. Since the compressor has not stopped its work, the system does not start up again to restore the temperature regime, but only increases the number of revolutions. So, the inverter compressor is constantly running, but with different power – depending on the sensor signals.
It is worth noting that refrigerators with a linear compressor operate at maximum power, and when the cooling temperature you set is reached, the sensors give the appropriate signal and the engine automatically turns off. This process is controlled by a special relay, under the pressure of which, when the engine is turned on and off, a click is triggered, and a characteristic hum of the engine is heard.
Pros and cons of an inverter compressor
The strengths of the inverter compressor in the refrigerator are as follows:
- Large energy savings (stated that by 50%) – compared with linear compressors by 10-20%. This is due to the fact that the inverter compressor only works at full capacity when it is first turned on, after which the speed decreases, and only the set cooling temperature is maintained.
- Increased service life of the parts involved in this scheme, since, unlike a linear compressor, the device does not warm up and does not fail after a certain time. All this leads to an increase in the life of the refrigerator – manufacturers give a guarantee for it for 10 years.
- The low noise level of its operation both at start-up and during temperature adjustment due to the low speed of the device. The maximum refrigeration unit with such a compressor can emit 38 decibels.
- Maintaining the optimal level of humidity inside the refrigerator. This leads to an increase in the period of storage of products in it, moreover, in this mode, more useful substances are stored in them.
But with such important advantages in the inverter installation, there are still a couple of disadvantages:
- Response to voltage drops. Electrical failures adversely affect the operation of the compressor. To reduce the risk of its failure, you need to additionally purchase a voltage stabilizer. Without it, the refrigerator during serious jumps can simply turn off and no longer start.
- Price. Naturally, models with this type of compressor will cost more, so they are not available to many. But given that the refrigerator is purchased for a long time and the purchase quickly pays off by reducing the payment for electricity, it is worth buying a worthwhile thing without hesitation.
Comparison of Linear and Inverter Compressor
To choose the type of compressor, it is worth taking into account the comparative table of characteristics:
|The life of a linear compressor is limited, while its inverter counterpart has special motors that do not have brushes, which adversely affect the duration of the unit.
|Current value when starting the device
|When the device is started, its maximum value is observed. The linear compressor, by virtue of its work, experiences it much more often than the inverter type of this motor.
|In the linear version, energy consumption is clearly normalized, so there are peak surges that are potentially dangerous for all other household appliances in the home if they occur at the time of simultaneous power take-off. When using refrigerators with an inverter type, there are no such problems.
|Degree of noise at work
|The linear device constantly uses the maximum power level, which is also accompanied by an audible clicking of the relay, which leads to a lot of noise. The inverter type of the device works almost silently.
|With smooth temperature control, all circuits and sensors work constantly, and a stable value of the set parameters is also maintained in both the linear and inverter versions.
|Wear of compressor parts
|The low power used during the operation of moving structures in the inverter apparatus increases its service life, since its parts are not subjected to significant loads.
To understand exactly which of the varieties is better, you can compare them with the operation of the engine in a car when it overcomes different roadways. So, the linear compressor works like a car that overcomes bumpy terrain, and the inverter analog rushes along a straight, smooth track.
Masters take note! Step-by-step instructions on how to check the compressor in the refrigerator.