31 Dec '12, 8pm

How did industrial motors get more efficient in 2012?

How did industrial motors get more efficient in 2012?

One of the most memorably egregious applications of electricity that I recall occurred at Roy’s farm, about two hours outside of Chicago. It was harvest time. Roy worked a lot of ground and had lots of grain bins. Those grain bins had fair-sized blower assemblies and motors to circulate air through the grain and bring down the moisture content. I was finishing up some wiring in his garage with my dad. We were adding drops, subpanels, and disconnects for a welder, air compressor, and large drill press. Roy wired things differently than we did. We were concerned with things like safety, service disconnects, fusing, bonding, ampacity, conduit fill, and keeping moisture out. Roy didn’t share these concerns. We were about done in the garage when my dad said something to the effect of “you won’t believe this!” I hurried over and saw Roy, a tough old dude, walk over to a 120/0/12...

Full article: http://electronicdesign.com/article/power/industrial-moto...

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