A little OT, but what the heck, there are electrons involved. Noticed some oddness re. a small ATV winch, 12VDC powered, with a PM brushed motor and an up/down reversing switch: It runs slower in the down direction than in the up direction...checked the resistance of the armature/brush dc path, same in either polarity. Checked the switch box, again, the same in both directions. What the heck! It does seem reasonable to run slower in the "unload" direction, but how is being done? Not really interested in tearing everything down to the bare bones to figure it out! One other interesting anomaly: The motor is tagged as 2.5hp, but given the approximately .5ohm armature resistance that I measure, that's about
24amps stalled rotor... 12V * 24A is 288 Watts, how in heck is that 2.5Hp? :-) Maybe those Chinese horses are really tiny?Bill