Low Ohm Armatures May Not Be All That, and A Bag of Chips…


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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