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

Constraints on rotating body (Siemens NX)

Constraints on rotating body (Siemens NX)

Constraints on rotating body (Siemens NX)

I am currently designing and simulating an electric outrunner motor (rotor on the outside). I need to evaluate the displacement of the external rotor at approximately 15000 rpm and in the software i am using (siemens nx) i apply this as a rotational load. I am fairly certain that the solver only uses this rotational speed to calculate the centrifugal forces. However, I am a bit uncertain about the constraints i have applied. In the motor mentioned, the shaft is connected to the external rotor by a slot connection and runs trough the internal stator (see figure). The shaft is supported by two bearings. I have currently modeled these bearings as infinite stiff using pinned connections (free rx,ry,rz and fixed x,y,z). However, the shaft also needs to be fixed at one location to stop rigid body rotation. I have therefore used an RBE2 (rigid connector) that is connected to face of the shaft and fixed. So my question is, does this seem like a OK way of restraining the model? Something tells me it's not.. (PS: The brown arrows in the figure are contact sets, and the spider at the shaft is the RBE2 which is fixed, the red arrows is an applied torque of 160Nm.)

Thanks for the replies!

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! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close