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Garage doors are what I do for a living. Most modern openers are no more than 1hp. (by modern, I mean within the last thirty years) A commercial unit may have a constant run motor in it, but most don't. Especially a 110 unit. Those that do usually spin at 1120rpm. Some have external gearboxes...

"The motor is an old garage door motor with a 1" square shaft poking out." Most of those are not constant run motors. She'll probably burn up in thirty minutes. Knowing that information would have saved me four hours worth of work. ;)