A motor — or a generator — requires some normal magnets and some electromagnets. The usual arrangement is to have a brushed commutator that both powers the electromagnets and switches their polarity ...
WASHINGTON — Propulsion firm Ursa Major announced a 3D printing-based approach to designing and manufacturing solid rocket motors it hopes will lead to faster and cheaper production. The strategy, ...
Despite the best efforts of the RepRap community over the last twenty years, self-replicating 3D printers have remained a stubbornly elusive goal, largely due to the difficulty of printing electronics ...
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