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Old 09-11-2010, 10:16 PM   #1
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Low rpm, high hp 12v motor

I'm sure there is an electrical engineer or serious hobbyist who knows way more about this stuff than I do. Here's the situation. Our composting toilet is wider than I'd like. I've done a cut out on the wheel well to accommodate the manual "flapper" that seals the bowl from the composting compartment. There's also a lower handle for turning the compost located in a really lousy location... but fortunately, the handle comes right off and the rod has a threaded end. This would be perfect for a small pulley. So, thinking out loud I said, "Hey, if I could find a low rpm, high torque motor to turn a large pulley, I could probably get the right gearing to turn the compost without the handle."

The pulley would fit flush while the handle (and the human arm required to turn it) take up far more room. Besides, the compost is much more likely to get turned via a switch than by hand.

So, if someone has a decent idea of a motor I could use to experiment, I'm open to suggestions.
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Old 09-11-2010, 10:41 PM   #2
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I don't have any specific recommendations, but you're in luck. What you really need is high torque, hp doesn't matter much for this application, and most electric motors make their max torque at 0 RPM.
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Old 09-11-2010, 10:44 PM   #3
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What about something like the motor on an electric tongue jack?
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Old 09-11-2010, 10:46 PM   #4
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Just happened to see this while browsing.

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Just a thought.

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Old 09-11-2010, 10:52 PM   #5
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i seem to recall something that might work in HVAC ducts. any hvac guys out there?
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Old 09-12-2010, 08:25 PM   #6
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I wish I knew how to set up the pulleys without creating so much pressure that it will "egg" the opening for the crank. Nice thought on the motor. I'm thinking the key is lots of torque but a very slow turn.
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Old 09-12-2010, 08:59 PM   #7
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Check these guys out. A geared motor may just do the trick.

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Old 09-12-2010, 09:40 PM   #8
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Quote:
Originally Posted by hampstead38 View Post
I wish I knew how to set up the pulleys without creating so much pressure that it will "egg" the opening for the crank. Nice thought on the motor. I'm thinking the key is lots of torque but a very slow turn.
do you have enough room to put a double pulley on the crank and a tensioned idler pulley in the opposite direction?
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Old 09-12-2010, 10:02 PM   #9
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You may find that the most inexpensive and practical approach is to obtain one or more power window motors from a junkyard, and adapt them.
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Old 09-13-2010, 08:04 AM   #10
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how about a wiper motor with the arm/crank on it?
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Old 09-20-2010, 11:28 AM   #11
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This motor is battery powered... you could either continue to use that (it claims 90 hours of use from a pair of D-cells) or you could convert it for 12V use. Should be high-torque, low-RPM and it would probably be easy to make a shaft adapter.

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Old 09-20-2010, 01:12 PM   #12
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I think Jammer hit...a power window or wiper motor..enough torque there to move heavy snow from most windshields...
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Old 09-20-2010, 02:22 PM   #13
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How about a starter motor from a small car engine or a motorcycle?
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Old 09-20-2010, 03:35 PM   #14
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i think he wants to limit the power so that if the auger binds, it doesn't break it. i guess you could put a clutch setup in it such as used in a drill. come to think of it, a drill might be the total solution.

slinging poop at high speeds could be useful in other situations LOL.
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