Go to Post This reminds me a lot of how millennials are regularly called out for simply being younger and having different perspectives. In the end it's the ones who are calling them out in unprofessional in ways that end up embarrassing themselves and looking uninformed. - Karthik [more]
Home
Go Back   Chief Delphi > Technical > Electrical
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
  #26   Spotlight this post!  
Unread 03-07-2003, 17:00
Unsung FIRST Hero
Al Skierkiewicz Al Skierkiewicz is offline
Broadcast Eng/Chief Robot Inspector
AKA: Big Al WFFA 2005
FRC #0111 (WildStang)
Team Role: Engineer
 
Join Date: Jun 2001
Rookie Year: 1996
Location: Wheeling, IL
Posts: 10,811
Al Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond repute
Quote:
Originally posted by Adam Y.
I have done this before besides a little bit of sparks nothing really was destroyed. The only time you risk destroying a battery from hooking it up to a motor is if you stall the motor.
OK guys, We have talked about this before. If you stall the motor you are putting one or two windings in parallel across the power source. There is still some resistance in the windings and therefore the resistance will limit the current.( It will be high but not maximum.) This IS NOT the same as a short of zero resistance. Maximum current will be drawn from the power source. In our case the battery is capable of more than four hundred (400) amps. That is more than enough to weld wire to the terminals, create a shower of sparks (both fire hazard and burning hazard), may cause bright flashes (retinal burns) and ultimately could cause battery explosion. Just because you have never witnessed a battery exploding doesn't meant it can't happen. Some of you have seen a battery that was stressed, swell and deform the case. That should be evidence enough that catastrophic failure is possible.
Sealed Lead Acid batteries are still lead acid batteries. The electrolyte is a sulphuric acid compound and the plates are lead. When batteries are stressed the electrolyte heats up and the lead deforms both of which contribute to the swelling case. You can interpolate the result if the deformation was rapid, an explosion would be the result. Hot, gelled sulphuric acid and plastic shrapnel are not my idea of fun.
I would try this, start by removing all of the circuit breakers that feed motors. If the controller still shuts down, it is not the motors or controllers. (assuming you have wired them according to electrical rules.) If all is OK, then insert one breaker and try again. Continue until you find the offending device. My suspicion is a wayward connector that will be obvious under visual inspection, or a damaged drill motor. Please let us know what you find.
__________________
Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
________________________
Storming the Tower since 1996.
 


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
How much planning goes into your robot? Jnadke General Forum 41 29-01-2006 21:29
serious problem found - robot controller resets when jarred! KenWittlief Electrical 23 19-03-2003 13:30
pic: Ball Drive Close Up CD47-Bot Robot Showcase 17 04-03-2003 15:23
WASH Palm scouting at the Championship Mike Soukup Scouting 2 19-04-2002 15:14
about how Drive Train push the robot... shouldn't the force accelerate the robot? Ken Leung Technical Discussion 12 26-11-2001 09:39


All times are GMT -5. The time now is 03:39.

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