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Servo speed.   Message List  
Reply | Forward Message #246 of 418 |
Motor Controller Max Amperage

I'm looking at using my Intellibrain & Expansion board with a small two-motor tracked robot kit.  Each motor is rated at 7.2V, 300 mA no load, 2.0 A stall.  The specs I see for the expansion board are 4x motor controllers, 1A each.  So if I used one per motor, and stalled the robot, these guys would be overdrawn... 
 
So I have two questions.  One, is there any kind of protection on the controllers so they won't fry in this situation?
 
And two, would it be possible to wire a couple of the motor controllers in parallel for each motor, thereby boosting the max amperage to 2A per pair?  (This seems very unlikely... the pwm driving the motors would have to be exactly in phase for each pair... but, no harm in asking!)
 
Thanks in advance,
 
Doug Franklin
Mon Jan 21, 2008 6:55 am

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drf717183
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Forward 		Message #246 of 418 |
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My apologies if this has been posted before, I did my best to search. Anyway, I am having trouble controlling the speed of the servos. According to some of the... 		arturuong
Offline Send Email 		Jan 14, 2007
5:20 am

Arturo, There a discussion of this topic in the navigation tutorial. See page 6 of the following: ...
ridgesoft
Offline Send Email 		Jan 14, 2007
5:29 am

Thank you so much, that helped a lot. ... page 6 ... http://www.ridgesoft.com/articles/navigation/ProgrammingYourRobotToNa vig\ ... ...
arturuong
Offline Send Email 		Jan 14, 2007
6:27 pm

I'm looking at using my Intellibrain & Expansion board with a small two-motor tracked robot kit. Each motor is rated at 7.2V, 300 mA no load, 2.0 A stall....
Doug Franklin
drf717183
Offline Send Email 		Jan 21, 2008
7:18 pm

The motor driver chip is spec'd to deliver up to 1A per output. It has thermal shutdown, but it's probably not a good idea to depend on this. The specs on the...
ridgesoft
Offline Send Email 		Jan 22, 2008
3:17 am

Thanks for the reply. I found a nice little hardware hack that could solve my particular problem: stack another motor driver chip on top. See: ...
Doug Franklin
drf717183
Offline Send Email 		Jan 23, 2008
6:31 am
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