Re: 300w E Bay Motors

[Joe Sommer <anvilus9-at-adelphia.net>]

Morgan,

At 06:30 PM 11/26/2004 -0500, Marmfam3-at-aol.com wrote:
>     How does one calculate the stall torque generated by a motor?

You must measure stall torque for a motor.  Once you
know stall torque for the motor itself, stall torque of
your drive train increases proportionally to speed
reduction.  A 9:1 ratio speed reducer is a 9:1 torque
multiplier ignoring friction.

I clamp a pair of Vise-Grip pliers to the motor shaft
and attach a 1/2 inch DIA dowel rod to the plier
handle to create a longer moment arm.  I clamp
the motor to a large piece of wood.  When the
pliers try to rotate, they are stopped by the wood.
I use a small force scale to measure force on the
dowel rod arm and multiply by the distance of
the force scale from the shaft to get stall torque.

It is much harder to measure stall torque for a
drive train because torque is much larger.  You
can use the same method but be careful.

Joe


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Joe Sommer
2378 Nantucket Circle, State College, PA 16803
814.234.4773     anvilus9-at-adelphia.net
http://www.anvilus.com