Best regards,Mr. Nice GuyCalculating Torque and RPM for an Electrical Motor

[Mr. Nice Guy]

Hello!

How do you calculate or determine Newton meter force requirement and rpm's for an electrical motor in the following example:

A device that utilizes a shaft that is 2 inches in diameter and 6 feet length. It needs to be able to lift 10 pounds and distance of 7 feet in 6 seconds. I need to know the formulas to make these calculations and the requirements needed for this application?

Thanks in advance for any assistance!

Mr. Nice Guy.

 

[physics girl phd]

You are going to have to show your own approach first...

Edit -- And this should also be in the homework help section of the forum.

 

[ravenprp]

Hello Mr. Nice Guy,

To determine the torque required for your application, you will need to use the following formula:

Torque (T) = Force (F) x Distance (D)

In your case, the force (F) is 10 pounds and the distance (D) is 7 feet. Therefore, the torque required would be:

T = 10 lbs x 7 ft = 70 lb-ft

To convert this to Newton meters (Nm), you can use the conversion factor of 1 lb-ft = 1.35582 Nm. So, the torque requirement in Nm would be:

70 lb-ft x 1.35582 Nm/lb-ft = 94.908 Nm

Now, to determine the required rpm for your motor, you will need to use the following formula:

RPM = (60 x Distance)/Time

In your case, the distance (D) is 6 feet and the time is 6 seconds. Therefore, the required rpm would be:

RPM = (60 x 6 ft)/6 sec = 60 ft/sec

To convert this to revolutions per minute (rpm), you can use the conversion factor of 1 ft/sec = 0.03728 rpm. So, the required rpm would be:

60 ft/sec x 0.03728 rpm/ft/sec = 2.237 rpm

Keep in mind that these calculations are based on ideal conditions and do not take into account any external factors that may affect the performance of the motor. It is always a good idea to add a safety factor to your calculations to ensure that the motor can handle the required torque and rpm.

I hope this helps! Let me know if you have any further questions. Good luck with your project!