This technology (the idea of linear compressor directly driven by a coil) is used for at least two decades, particularly in LG compressors in AC and refrigerato

This technology (the idea of linear compressor directly driven by a coil) is used for at least two decades, particularly in LG compressors in AC and refrigerators [1]. 1. https://en.m.wikipedia.org/wiki/Linear_compressor https://en.m.wikipedia.org/wiki/Linear_compressor