Subject:
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Burning hot motor driver chips.
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sun, 9 Nov 1997 03:55:34 GMT
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Original-From:
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Anthony Oren Loeppert <oren@mailSPAMCAKE.utexas.edu>
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Viewed:
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1340 times
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After not doing anything with my HB for a few months, I decided to buy a
cheap RC car and use it as a platform. Anyway, I get a car that takes 6 AA
batteries because I figure that the main motor is probably 9v (maybe that
was a faulty assumption). So I connect the steering motor to motor1 and
the drive motor in motor3, so each motor has it's own driver chip. Well
after a few cycles of the below code, the drive motor ceases to get enough
power to move the car (the motor begins to spin if I pick the car up).
Upon burning my finger, I discovered that the chip running the was
extremely hot. So my question is: Is this motor simply drawing too much
current? I thought the L293D (which is what I am using) had some sort of
built it cut off if things got intolorable for it. I also understand that
the L293D can be piggy backed, but will that give me enough amperage to run
a typical RC car motor? Am I going to have to use an alternate driver?
Thanks for any suggestions/explainations,
//test drive
int main()
{
int i;
i=0;
while(i<1000)
{
fd(3);msleep(1000L);
off(3);msleep(250L); //attempt to give chip a break
if(digital(8))
{
bk(3);msleep(500L);
fd(1);msleep(1000L);
off(1);
}
i++;
}
return 0;
}
Anthony Oren Loeppert ***
http://www.cs.utexas.edu/users/oren/ * o*
* ***>
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Message has 3 Replies:
 | | Re: Burning hot motor driver chips.
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| Anthony, (...) Yes it sounds like it. (...) It does. The L293D still works after it cools off, doesn't it? (...) I suspect you are going to need more than just two piggy backed L293D. (...) You might have a look at Ben Wirz website, he sells various (...) (27 years ago, 9-Nov-97, to lugnet.robotics.handyboard)
| | | Re: Burning hot motor driver chips.
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| Hello, RC car motors pull a lot of current, from 2A to 8A. The L293D chip goes up to 1A peak (for some miliseconds) before it shuts down. I suggest bypassing the L293D chips and using something like the LMD18200. (URL) Good luck, Marco A.A. de (...) (27 years ago, 10-Nov-97, to lugnet.robotics.handyboard)
| | | Re: Burning hot motor driver chips.
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| Anthony, As you've no doubt heard, RC motors take much more current than the Handyboard can supply. To control RC motors your only choice is to create a separate H-bridge to drive the motors. You can do this fairly inexpensively with power (...) (27 years ago, 10-Nov-97, to lugnet.robotics.handyboard)
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