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Unread 03-04-2010, 08:54
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Re: Will a 1/3 horse power sump pump motor burn up at half power?

Torque is measured using units such as oz-in and in-lbs, in refers to the radius of the shaft, wheel, or gear (etc.) in or lbs refers to the tangential force. The lack of a slash or the word per tells you there is no division involved. torque is the product obtained by multiplying the force tangent to the radius times the radius.
For example, all of these will yield the same torque ratings:
  • 1 lb of force tangent to a 6 in radius wheel
  • 2 lbs of force tangent to a 3 in radius wheel
  • 8 oz of force tangent to a 1 foot radius wheel
  • 1 oz of force tangent to an 8 foot radius wheel
  • 6 lbs of force tangent to a 1 in radius wheel
  • 48 lbs of force tangent to a .25 in diameter (.125 in radius) shaft
  • etc

For all of these the torque is 6 in-lbs, or 96 oz-in. If you want more torque and you have large wheels, get smaller wheels. Wheelchair motors should be relatively strong. Most un-geared DC motors don't even provide more than 60 oz-in (3.75 in-lbs) of torque. CIMs provide alot at 343.27 oz-in (~21.45 in-lbs).

Also check out my response on this thread if you still want more powerful motors.
http://www.chiefdelphi.com/forums/sh...threadid=84877

torque converter
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