×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

motor torque

motor torque

motor torque

(OP)
I am building a display case, and I am needing to know what kind of motor I will need to use to rotate a 100 lbs object at about 4 rpm.  I am unable to find any calculations.  
Thanks
CGBEN

RE: motor torque

What is the size and shape of the object?  A relatively light lump of metal shaped to move air (called fan blades/impreller) would require much more power than a solid disc!

RE: motor torque

Also refer to this link:

http://www.patchn.com/motorformula.htm

You will have to find the 'inertia' of the object or Wk^2 where W is the weight and k is radius of gyration, which is calculated by shape of the object.

RE: motor torque

Hi, first you have to find the moment of inertia of your load, then you have to decide what angular acceleration you require, add in frictional losses. That should give you the power required.

RE: motor torque

1200 rpm AC motor with a 300:1 gearhead should cost you about $80.  2" or 3" frame should be large enough.  Direct couple motor to the load.  The friction of the gearing should dampen OK during startup.  If not use a lossy coupler like a section of stiff hose and hose clamps.

RE: motor torque

Suggestion to the original posting: Proceeding from the load side to the motor side leaves a wide choice for the motor selection. The choice would narrow down if there was posted preferred motor voltage, frequency, type of controls, etc.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources