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Using starter motor with chain system for cutter (weapon)


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anshulmahale1



Joined: 20 Jan 2014
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Using starter motor with chain system for cutter (weapon)

i have fitted a pivot to car starter motor and chain to it and fitted to a drum cutter , for my robot. but my starter motor which is in good condition works for just a few seconds and as the wire heats it stops and then after cooling down of wire it again starts. any solution for this. i have tried a wire of 10sqmm gauge copper.

Post Wed Jan 22, 2014 2:54 am 
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Nick
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Joined: 16 Jun 2004
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Location: Sydney, NSW


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Starter motors are a bad choice to power weapons; they are only meant to run for short periods and will overheat quickly, as you are seeing. The motor may have a thermal cut-out inside it that is stopping the motor before it overheats too much.

If you can tell us a bit more about the weapon (weight, diameter, RPM, etc.) then we can probably suggest the best type of motor for you.

Post Wed Jan 22, 2014 9:07 am 
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Valen
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sounds more like an internal polyfuse or something than a hot wire.
Normally hot wires just get hotter.
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Post Wed Jan 22, 2014 12:03 pm 
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anshulmahale1



Joined: 20 Jan 2014
Posts: 6


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Using starter motor with chain system for cutter (weapon)

i have already fixed the motor nd it gives a very good out put. and it doesnt have any thermal control. its a simple brush motor. prob is that the wire is not supporting. incase any body can suggest anything about wires incase u suggest any other motor than, its a 500 g, drum cutter

Post Thu Jan 23, 2014 1:25 am 
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Jaemus
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Thicker wire?
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Post Thu Jan 23, 2014 12:48 pm 
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Nick
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Joined: 16 Jun 2004
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10sq mm is around 8 to 10 gauge wire - if that is heating up too much then even if thicker wire helps, the current draw is so high that huge batteries will be needed to power the motor for a whole match. Do you really mean the drum weights 500 grams? that is tiny to be powered by a starter motor!

Just having the wiring get hot will not stop the motor running - something else must also be overheating and going open-circuit. What type of battery are you using?

Post Thu Jan 23, 2014 3:40 pm 
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anshulmahale1



Joined: 20 Jan 2014
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i m using a car battery. and according to a electrician the motor is perfectly fine

Post Fri Jan 24, 2014 1:01 am 
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miles&Jules
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The other problem is starter motors are usually to heavy for feathers…what size bot are you building?
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Post Fri Jan 24, 2014 1:16 am 
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Nick
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With a car battery's weight, it definitely isn't a feather!

I really can't think of a reason why the motor is stopping. Does it slow down before it stops, or does it just stop suddenly?

Post Fri Jan 24, 2014 8:36 am 
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anshulmahale1



Joined: 20 Jan 2014
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my bot dimensions are 50 X 50 X 30 and batteries arent on the bot, its a wired bot as we have wired bot competitions in india

Post Sun Jan 26, 2014 1:04 am 
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