Low Ohm Armatures May Not Be All That, and A Bag of Chips...
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In this edition of the Work Bench, we do destructive testing on a couple of low ohm Mabuchi SH-030 style can motors. The armatures in these assemblies are about .2 ohm or so. Amp draw in an unloaded situation is 1 amp at 10 or so volts. In a normal 6 ohm level 4 car this would be about .20 amps. So these things are sucking PILES of current !! They don't even get close to 18 volts before the commutator collar melts and the comm plates flower out to destruction.
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Wow. What accounts for such low resistance? The arms look like they have "normal" copper windings. Were these motors designed as slot car motors or were they originally made for some other purpose? Great to see another Workbench video. Keep'em coming.
Excellent video! The takeaway is that components need to be designed for the intended purpose. Or at least suitable for it.
Terry did not hook a bag of chips to the power supply to compare performance. I feel cheated.
Can I get a link to where I can buy some of these. Ty
Yeah, really not the correct application. I purchased some cans that had the same problem. The resistance wasn't listed on the for sale listing, but the size looked ok for what I needed. Course when they arrived, the size was ok, but the resistance was ridiculously low. I'm sure they were probably meant for a toothbrush or something pushed by a double A, but they were so inexpensive I figured I'd give it a shot. Never know, I may be able to use them at some point to power something not connected to the track. Mine melted about the same way, and it was fun doing it and listening to the can screaming!
Time to try modifying them to be more durable.