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Motor Torque? Question
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Posted by: smd79

09/22/2004, 09:45:11

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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

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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

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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 LB-FT






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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

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Thanks a lot guys, this was really helpful.

Shawn







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