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Scaleauto motor

4030 Views 21 Replies 12 Participants Last post by  wideboy
Evening all,
I was at the shop today and they now have A scaleauto 35,000 rpm motor to fit most of our RTR cars. I have no idea what to put it in but the torque figure was amazing: 190gm/cm.(GRUNT/cm.) Over half again the power of my beloved V12/2b 25,000 motor! The prof. said the feedback has been very good on it, and it is a dollar less than the v12. (So I HAD to buy one.) Anyone tried them around here? I'll wager I'll be gearing down on my track.

Looking for a bigger hammer,
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QUOTE I suspect there is no motor that can compete with it using 1 amp power supplies.

Hi Tropi,
unless I'm drastically wrong, that motor will be drawing far more than 1 A most of the time

My understanding is that the figure on motor stickers is the no load current, which is nearly useless. A motor will draw max amps when it's stalled - for the Scaleauto, armature resistance should be no more than 3 Ohm , so 12 V/3=4 A (assuming the power supply can churn them out without sagging)
As revs go up, the current decreases linearly down to the no load value

Very roughly, a slot car motor should operate in the middle third of the range, so the Scaleauto would be drawing between 2.6 A (accelerating out of a turn) and 1.3 A (max speed down the straight)

That said, I cannot understand why nobody measures current draw these days - that's the real indication of the energy put into play, and can be done with a cheapo multitester

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let's ignore Tropi (I guess you know the bumblebee story) - no, seriously, is the PSU an unregulated wall wart without overload protection ? Voltage must go way down (and PSU temperature up), but with magnets there's no way that thing will draw less than 2 A

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