How to calculate torque for a motor?

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SUMMARY

To calculate the required torque for a motor to lift a weight, the formula Torque (T) = Force (F) x Displacement (D) is essential. For example, lifting a 1 kg weight (1 N) with a drum diameter of 1 meter requires a minimum torque of 1 Nm. Additionally, the power equation P = 2 * π * f * T can be used, where P is power in Watts, f is frequency in Hz, and T is torque in Newton-meters. It is crucial to convert RPM to frequency for accurate calculations.

PREREQUISITES
  • Understanding of basic physics concepts, particularly Newton's laws of motion
  • Familiarity with torque and its units (Newton-meters)
  • Knowledge of power calculations in mechanical systems
  • Ability to convert RPM to frequency (Hz)
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  • Study the relationship between torque and power in electric motors
  • Learn how to apply Newton's equations of motion for various lifting scenarios
  • Research the impact of drum diameter on torque requirements
  • Explore the conversion methods between RPM and frequency for motor calculations
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Engineers, mechanical designers, and hobbyists involved in motor selection and torque calculations for lifting applications.

fkneg12
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Hi all,

Just wondering how to work out what torque motor we need to get to lift a certain (as yet undetermined) weight.
Is there a formula to work out what torque we need once we know the weight?

Thanks in advance
 
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It depends on the diameter of the drum that you are winding your cable onto. If you had a weight of 1 Kg (1 N) and a dia of 1 meter youd need a minimum torque of 1NM.
 
Torque is Force X Displacement. So you could calculate your force using Newtons equations of motion to get your missing variable like velocity if needed. Or you could just assume a height and multiply by gravity. that will give you force. This however is also assuming a 0 angle in the lift.
 
If you want to calculate torque which occurs in shafts, you have to use this formula;
P=2* (pi) * f *T
T is torque (Newton*meter)
P is power (Watt)
pi = 3,1415...
f is frequency of rotation (1/s = Hz)
sometimes you can find revolution as rpm. So you have to change rpm to frequency.
(1 Hz = 60 rpm)
:smile:
 

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