I'm thinking of an off the shelf surplus VFD, though I suppose an open source VFD wouldn't be quite out of the question. Some EV builders have done just that.
A simple 555 or timer module can be used to force full speed every few minutes for oil return.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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