×
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

Gearbox efficiency...

Gearbox efficiency...

Gearbox efficiency...

(OP)
Hi,
Recently I have encountered a few problems sizing gearboxes for applications with servo motors. I went through previous posts but could not find a relevant answer.

Most gearbox manufactures supply information like inertia, efficiency, nominal (or maximum) torque, and speed. Is it possible to calculate (or estimate) from this data no load (friction) torque of the gearbox? In the other words, how much power is dissipated in the gearbox when no load is applied on the output shaft? How do you define efficiency in this case?

To put things into perspective, I have a right angle NEMA23 size 3:1 planetary gearbox. The no load torque is so high the motor uses almost 60% of its power just to turn the gearbox itself. On the other hand, the same size inline gearbox works with no problem. The manufacturer clams 95% efficiency in both cases and nominal torque of 9Nm (the motor can deliver continuous only 0.19Nm).

Can you please put me on the right track or direct to relevant literature.

Regards,
Pawel

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