Go to Post It's easy to get so caught up in the intensity of build that we forget we need some down time to recharge and get a fresh head. Taking a day off will only happen if you make it a priority as important as any other team meeting. Long hours do not equate to productive hours. - Greg Hainsworth [more]
Home
Go Back   Chief Delphi > Technical > Technical Discussion
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
 
 
Thread Tools Rate Thread Display Modes
Prev Previous Post   Next Post Next
  #22   Spotlight this post!  
Unread 08-03-2006, 14:28
KenWittlief KenWittlief is offline
.
no team
Team Role: Engineer
 
Join Date: Mar 2003
Location: Rochester, NY
Posts: 4,213
KenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond repute
Re: Power issues...Electrical? Mechanical?

Al has provided a great check list

and it made me think of one more possibility. You have not stated in the list of problems whether you are using any type of PID closed loop / feedback to control motor speed or robot direction

BUT if you are, and your PID loop gains are set too high, the commands going to the motors could get very wild (extreems) even if the robot is not moving around much

normally if you have the PID gain too high the robot will be twitchy, will overshoot and tend to oscillate, but you might not see those symptoms. The thing that makes this difficult to test is you cannot simply put a scope on the PWM outputs to see what the control signals are doing (if they are going wild). You would have to capture them with a printF statement or some other SW debug tool, then drive the robot smoothly and see if the motor PWM outputs are going 244, 3, 220, 12, 254, 0.... back and forth all the time.

this would be almost the same as applying full power to a stalled motor. It would draw a huge amount of current, even though the robot is hardly moving.
 


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Mechanical Wheel Encoders? Jaine Perotti Electrical 15 04-12-2004 22:46
Major Electrical Issues and Malfunctions Teedoff101 Electrical 12 21-03-2004 09:41
4WD with 4 motors archiver 2001 8 23-06-2002 22:58
How do people get hot motors? archiver 2001 11 23-06-2002 22:24
Max mechanical power of motors, how is it useful? Ken Leung Motors 1 09-11-2001 14:15


All times are GMT -5. The time now is 08:09.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi