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Motor Torque?  
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Posted by: smd79 ^{®} 09/22/2004, 09:45:11 Author Profile Mail author Edit 
hi, a simple question on a concept which has me kinda confused. what does the torque represent when given in a motor spec? i know what toque is, force*distance but where is this being applied? is it the torque on the shaft as it rotates? if so then given rotational speed and diameter how would i calcuate this? also, if there is a sprocket on this shaft which drives a conveyor, is the torque applied to the conveyor the same or does the diameter of the sprocket change this value? any input is greatly appreciated, thankyou Shawn. 
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Re: Motor Torque?  
Re: Motor Torque?  smd79  Post Reply  Top of thread  Forum 
Posted by: daves ^{®} 09/22/2004, 21:20:08 Author Profile Mail author Edit 
In this case assume torque is a constant. Imagine the motor is turning a sprocket that has a chain hanging over it with a bucket on the end. As usual in these discussions, neglect the weight of the chain. If the radius of the sprocket is L and the torque is K then the amount of weight the motor could lift is W = K/L. So if the radius doubles the weight that could be lifted is cut in half. However, for a given speed of rotation, doubling the radius doubles the speed it lifts with. That should be a start. 
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Re: Motor Torque?  
Re: Re: Motor Torque?  daves  Post Reply  Top of thread  Forum 
Posted by: zekeman ^{®} 09/23/2004, 08:15:35 Author Profile Mail author Edit 
A motor is usually specified in horsepower and RPM. The equation that relates torque, HP, and RPM is;
HP=RPM*2*pi*torque/33000 in a 100% efficient system. where torque is given in LBFT 
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Re: Motor Torque?  
Re: Re: Motor Torque?  zekeman  Post Reply  Top of thread  Forum 
Posted by: smd79 ^{®} 09/23/2004, 09:15:20 Author Profile Mail author Edit 
Thanks a lot guys, this was really helpful. Shawn 
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