Posted by John T on December 09, 2008 at 07:23:09 from (66.244.97.31):
Yo, Jimbo n the Bobster, I got late on the post regarding the starters current draw if 12 verus 6 volts was applied, so have some questions for yall.........
1) Fer as I know the maximum curretn draw is at locked rotor I think yall agree with that....???
2) If the load was pure resisitve and there werent any inductive and magnetic field considerations at 12 volts there would be exactly twice the current flow.. Ohm Law DUHHHHH agree ??
3) Hoewever, due to inductance and magnetic field effects, at 12 volts it wont draw quite twice the current (of course the load affects all this) Yall agree??????????????
SOOOOOOOOOOOOO the big theoretical question is WHY NOTTTTTTTTTTTTTT
Isnt the reason the current decreases as RPM increases due to the magnetic field generated which creates the so called BACK EMF and in affect that sort of a self generating process helps the motor action along because the otherwise necessary external battery current to create the electromagnetic field is reduced due to the fact the spinning of the armature inside the field is creating some of its own magnetic field (its also acting as a DC generator besides just a DC motor) ....... Sooooo since the 12 volts makes the starter crank faster theres even more of that self help action (faster the spin the more magnetic field strength created) which is the reason a 12 volt FASTER SPINNING starter wont really draw quite twice as much battery current as the slower spinning 6 volt starter.....
WHATCHA THINK????????????????
Now if you get into WORK and Energy (volts x amps x time) and instantaneous power (volts x amps) I have to put on my thinkin cap on unless one of you gents want to give us a refresher course......
Gotta work on the RV more today, gettin ready to head south for the winter, there will be a test on the above so I insisit that you both exercise due diligence and all due dispatch in responding to my above inquiry lol
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