motor torque question

Feb 08, 2005 2 Replies

Hi, Jr. year ME student at OSU here. I am involved in reverse-engineering a Kenmore trash compactor, and there is one detail I am having trouble finding. I have a motor that has a .5 diameter shaft, runs at regular



120V/60Hz, and creates 2200 lbs force at the "ram" (the thing that squashes the trash). The specs I have on this thing do not give me data for rpm's on the motor, and to do a failure analysis of the shaft I need to develop an expression fo the torque on the shaft. Any ideas on how to progress? The motor drives a sprocket that drives a chain around two other sprockets in an equilateral-triangle formation. There are two power screws attached to the other two chain-driven sprockets- the 'ram' moves down on the power screws. Thanks for anything; I'm doing internet research as we speak on this to try to find any info possible on rpm's and/or torque of this motor.

-k wallace


think I found answers. Found a spec re. 1/3 hp motor & 60 rpm, & was able to "back out" from that using some equivalence equations for round shafts & shear eqn's. So thanks anyway...and any advice welcome of course.

-kw

Power = force x velocity knowing the power (in watts, not horsepower), and knowing the maximum force, you can get to the maximum speed...

I haven't done much rotating equipment design, so don't know where to take you next.

David A. Smith

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