×
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

Calculation of Starting torque for Hoist load

Calculation of Starting torque for Hoist load

Calculation of Starting torque for Hoist load

(OP)
Dear friends:

Please explain how to develop a torque v/s speed characteristics of given hoist load. Especially i would like to know how to calcuate starting torque for given hoist load.

Sri

RE: Calculation of Starting torque for Hoist load

Sri,
Do you mean torque required from a motor?
Static load (torque) after you have establised the gear or pulley configuration would be straight forward, right?  Or am I missing something?
Motor wise there is an in-rush current for just the motor to start, and that you should get from the motor manufacturer.

RE: Calculation of Starting torque for Hoist load

(OP)
Hi Monkeydog:

Thank you very much for your reply. Basically i am looking for characteristics of Hoist load, but not the motor. Here i am trying to develop torque v/s speed charactristics of Hoist load, then i will try select a motor for given hoist load.

Thanks
Sri

RE: Calculation of Starting torque for Hoist load

Not so easy, for hoists the most difficult part of the calcs is the number of loaded starts per hour that the motor will be able to handle without suffering an overload, that's why different classes of service are given by hoist manufacturers for their different equipment.

Besides that the power absorved will be dependend on the speed the load is going to be raised.

Do not forget the braking load calcs also, they are also criticall

SACEM1

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