The S-RAM low-friction drive mechanism can be mechanically modulated, enabling more efficient compressors and expanders.
KEY S-RAM ADVANTAGES
Reduced drive-power and improved efficiency
The extremely low frictional losses of the S-RAM pay off in reduced input power and a reduced cooling requirement for compressors, over the wide range of displacements.
The stroke of the S-RAM can be varied while keeping the head clearance constant, which is not possible with other drive mechanisms.
Near Perfect balance
The motion of the S-RAM pistons is near sinusoidal and the harmonic components are unusually small. There are no even harmonics since the piston motion is symmetrical about the midpoint of travel. Any number of pistons three or greater and evenly spaced can be near perfectly balanced. The S-RAM with variable stroke can also be balanced.
The S-RAM can be easily configured with double-ended pistons that will operate 180 degrees out of phase with the first. This takes up little space and can dramatically increase power density of a compressor/expander.
The S-RAM is a new way to drive pistons and no new requirements are placed above the piston. This open-cylinder architecture arrangement allows a designer to use the same valves, cylinders, manifolds, etc., and conversion from any current design can be fairly straightforward.
Fixed or Rotating Barrel designs
The S-RAM drive can be used in rotating or fixed-barrel configurations. We have built both.
Wear and Life expectancy
Tests on our prototype S-RAMs have shown very low wear, which one would expect as a result of low friction. Bearing surfaces on the S-RAM 500 hp pump showed no measurable wear after several hundred hours of operation under load.
Reduced parts count and weight
The S-RAM uses significantly fewer parts and less weight than crankshaft mechanisms and similar parts count as compared to swash plate and bent axis mechanisms.
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