Electro-Mechanical Resonant Oscillator
011122 Like and subscribe. This is an archive, check the link in the end if you are owner. In this video I'll show how to build a resonant mechanical oscillator that's driven by an electromagnet. The electromagnet is pulsed by a circuit
with an adjustable frequency, so it can be fine tuned to run at the exact resonant frequency of the spring-mass system. In this case that
frequency is about 11 Hz. The driver basically just consists of a 555 timer and a MOSFET to turn the coil on and off. In the future, i think i
need to use a feedback controller to do this, because even when i get the system to resonate, it eventually drifts out of phase and resonance
dies off (even though the frequency is matched).
This type of device is commonly found in the compressor section of compact cryocoolers for infrared imaging and other sensors that require
extremely cold temperatures to operate. Suspending the compressor pistons on a flat spring or "flex bearing" and driving them at resonance allows
for high power and efficiency even with the relatively weak forces between the magnets and the coils. This is analogous to a flywheel on a
crankshaft, but is lighter, smaller, and more reliable. By avoiding the need for the bearings and linkages present in a rotary system, this kind
of devbice can achieve an extremely long service life (some are rated for over 200,000 hours of operation) inside a hermetically sealed unit.
This is part of my investigation into building my own refrigeration system (and eventually cryocooler) without HFC's/phase change refrigerants.
Several months ago i made a video showing how i built a compressed air turbine which I intended to use as a Brayton cycle cooler, and while it
did work, the extremely loud noise made it impractical in a home environment, so I'm now investigating reciprocating systems like Stirling/Pulse
Tube/Thermoacoustic/Gifford-McMahon-type devices for generating extremely low temperatures.
Music Used:
Kevin MacLeod - George Street Shuffle
Kevin MacLeod - Groove Groove (Yes, this is the same song that's in Kerbal Space Program)
STL Files:
https://www.thingiverse.com/thing:5594081
Metal Spring DXF file:
https://drive.google.com/file/d/1OX4CL7d9jAzPwvoHF9XoKwuRwrusV23V/view?usp=share_link
Driver circuit schematic:
https://drive.google.com/file/d/1chrHYzkV6LTJ1hQsXgQ6WjCTgmVXKFEx/view?usp=share_link
Further reading on cryocoolers:
Fabrication shop i used for the metal springs:
https://sendcutsend.com/
https://rumblevideoarchive.wordpress.com/
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