×
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

bearings for electric motors

bearings for electric motors

bearings for electric motors

(OP)
hello,
is there a genaral rule when to use c3 bearings for electrical motors?
thanks.

 

RE: bearings for electric motors

yes, always, some applications c4

Russell Giuliano
 

RE: bearings for electric motors

Depends on the size in my experience.  Medium to large motors tend to use C3.  Smaller motors and ones used in home appliances and power tools tend to use CN.
I never understood why they use C3 on larger motors, I can't see the need personally.  Are there large heat differentials?

RE: bearings for electric motors

IMHO, motors use a variety of fits (including heavy presses) and temperature ranges.

Since the L10 penalty for a little too much clearance is a lot less than the penalty for things being too tight, C3 is used across the board, even though it is often not required.

RE: bearings for electric motors

The rotor also moves as the coils are energized and it seeks its magnetic center.  So C3 allows it to move without adding preload to the bearing

RE: bearings for electric motors

I tend to think Fugeguy  is correct.

=====================================
Eng-tips forums: The best place on the web for engineering discussions.

RE: bearings for electric motors

It all sounds good to me.

RE: bearings for electric motors

Good and down-to-earth reasoning. I also see mostly C3. Never asked why. Good to have an answer smile

Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

RE: bearings for electric motors

(OP)
thanks everyone!!!!
Yaniv.

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