Go Back  R/C Tech Forums > General Forums > Electric On-Road
how to shim a motor? >

how to shim a motor?

how to shim a motor?

Old 04-10-2007, 09:18 AM
  #1  
Tech Elite
Thread Starter
iTrader: (18)
 
VooDooPH's Avatar
 
Join Date: Feb 2006
Location: Philippines
Posts: 3,715
Trader Rating: 18 (100%+)
Default how to shim a motor?

how do ya do it? how can you tell how much or how little to put on one end?
VooDooPH is offline  
Old 04-10-2007, 09:48 AM
  #2  
Tech Elite
iTrader: (9)
 
seaball's Avatar
 
Join Date: Sep 2001
Posts: 4,304
Trader Rating: 9 (100%+)
Default directions

1. put the motor together w/o shims.
2. holding the motor with the armature horizontal, push the armature each direction in the can and let it return to center (it will get pulled to the center of the magnetic field). note where it rests.
3. place shims in motor where appropriate to keep the armature at the location determined in step 2 (above), leaving .1-.3mm of slack.
4. repeat step 2, to verify your accuracy.
5. done.
- or -
5a. repeat steps 3 and 4 until correct.


notes:

I. the bushings will impose drag on the armature which will make it stop short of the center each way. take the average of both directions.
II. the endbell screws will have an effect on the apparrent center. don't hold the motor together w/o them. reassemble it fully each time.
seaball is offline  
Old 04-10-2007, 09:49 AM
  #3  
Tech Addict
iTrader: (3)
 
Patriiick's Avatar
 
Join Date: Dec 2003
Location: Switzerland.
Posts: 595
Trader Rating: 3 (100%+)
Default

I ll try to make this as painless as possible, and quick too:

- Take out all shims from your armature, remove brushes and springs.
- Put armature in can and screw endbell on
- Put a pinion gear on motor

Spin manually the armature, as it stops it will center itself between the magnetic fields, leaving play on both sides (endbell side and can side)

Shim one end (where you seem to have most play) and repeat process, adding shims on both ends until you have very little play left (ie you can feel some play but do not see it).

As you spin your armature, it will recenter itself each time.

Once done, This means your magnets will not "pull" or "push" the armature, giving you better efficiency..

hope i was clear and hope it helps..
Patriiick is offline  
Old 04-10-2007, 09:54 AM
  #4  
Tech Elite
Thread Starter
iTrader: (18)
 
VooDooPH's Avatar
 
Join Date: Feb 2006
Location: Philippines
Posts: 3,715
Trader Rating: 18 (100%+)
Default

much much help. thanks!
VooDooPH is offline  

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.