Linear compressor

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A linear compressor is a gas compressor where the piston moves along a linear track to minimize friction and reduce energy loss during conversion of motion. This technology has been successfully used in cryogenic applications which must be oilless.


A number of patents for linear compressors powered by free-piston engines were issued in the 20th century, including:

The first market introduction of a linear compressor to compress refrigerant in a refrigerator was in 2001.[4]

Valved linear compressor[edit]

The single piston linear compressor uses dynamic counterbalancing, where an auxiliary movable mass is flexibly attached to a movable piston assembly and to the stationary compressor casing using auxiliary mechanical springs with zero vibration export at minimum electrical power and current consumed by the motor.[5] It is used in cryogenics.[5]

Linear compressors are used in LG and Kenmore refrigerators. Compressors of this type have less noise, and are more energy efficient than conventional refrigerator compressors.

See also[edit]


  1. ^ "Espacenet : Original document". Retrieved 5 November 2017.
  2. ^ "Espacenet : Original document". Retrieved 5 November 2017.
  3. ^ "Espacenet : Original document". Retrieved 5 November 2017.
  4. ^ "Problems 4.7 - A Home Refrigerator (updated 3/15/13)". Retrieved 5 November 2017.
  5. ^ a b Reed, Jaime; Dadd, Mike; Bailey, Paul; Petach, Michael; Raab, Jeff (2005). "Development of a valved linear compressor for a satellite borne J–T cryocooler". Cryogenics. 45 (7): 496–500. Bibcode:2005Cryo...45..496R. doi:10.1016/j.cryogenics.2005.03.007.