Since 2000, LGE has produced the Linear Compressors for household refrigerators, and several million linearcompressors have been operating in Korea and Europe. For producing the Linear Compressors, LGE has solved lotsof reliability problems, for example, accurate driving of the free piston.For the capacity modulation, the displacement modulation operation is used in the LG linear compressor, instead ofchanging operating frequency. As expected, the small displacement operation leads to large dead volume. There is amisunderstanding that the efficiency of linear compressors in the small cooling capacity is lower, because it has alarge dead-volume. However, LGE found that the dead volume doesn't influence the efficiency of compressor; onthe other hand, the most important factors are the motor and mechanical efficiency.Deeper analysis of the motor and mechanical efficiency with the variation of the piston diameter and displacementshows that the efficiency with a large dead volume can be much higher.Finally, LGE created the Innovative Linear Compressor, which has much higher efficiency in the small coolingcapacity. Also, the refrigerator with this linear compressor shows that the power consumption reduction by 25% canbe achieved, as compared with the reciprocating compressors, and CO_2 reduction of the linear compressor isequivalent to the absorption by 9 pines. Based on the outstanding CO_2 reduction, LG linear compressors will be theone of Green technology to keep the global clean.
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