Oxygen concentrators require precision oil-less compressors that are quiet, low-vibration, small & lightweight, powerful, efficient, and cost effective. The Spin Pump is a prototype that tested the feasibility of a rotating stator.
I led the design,testing, and manufacturing of possible new compressors to test their feasibility. The "Spin Pump" described in US20150098841A1, details the function of one of such compressors that I worked on while there.
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