Thread: Disadvantages to CAN?
View Single Post
  #7   Spotlight this post!  
Unread 19-01-2014, 01:20
Levansic's Avatar
Levansic Levansic is offline
Registered User
AKA: Len Evansic
FRC #0585 (Cyber Penguins)
Team Role: Mentor
  
Join Date: Jan 2012
Rookie Year: 2008
Location: Tehachapi, CA
Posts: 185
Levansic has much to be proud ofLevansic has much to be proud ofLevansic has much to be proud ofLevansic has much to be proud ofLevansic has much to be proud ofLevansic has much to be proud ofLevansic has much to be proud ofLevansic has much to be proud ofLevansic has much to be proud ofLevansic has much to be proud of
Re: Disadvantages to CAN?
The quality of closed loop current control really depends on your expectations. We find it OK for controlling torque, to a point. With the relatively small motors designed for low duty cycles (e.g. window motors), you have to be aware of the effects of coil heating, and the specific friction of each individual gearbox. Your mileage may vary greatly, especially the more you test.

Also, the measured current will be accurate to about an amp or so. If your parameters aren't set correctly and you try to command a load higher than 20A, you may induce a shutdown before anything even moves, due to firmware coded limits. The v. 107 firmware is better than the previous incarnations, but it is still very overprotective.

--Len
Last edited by Levansic : 19-01-2014 at 17:09.
Reply With Quote