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stator question
artv:
Hi Flux ...single phase with (9 coil, 12mag)...is it all the coils are hooked in series one right after the other?Three phase every third coil hooked in series? So single phase is basically one coil, Three phase basically three coils.This way the three phase would be better because it creates less heat being its' only producing 1/3 of the time,compared to single which produces all the time?When things get hot effiecency goes down.......don't know if I'm reading things right...........artv
wooferhound:
in a single phase machine
the Starts & Ends are reversed on half the coils
to match the fact that half the magnets are reversed
Each coil set in a 3 phase machine is producing just as much of the time as the coils in a single phase machine, but the peaks of the 3 phase AC waves are only slightly offset from each other and better able to make a steady DC output after rectification. A single phase machine will produce AC peaks that are much farther apart and creates a Pulsating DC after rectification to DC voltage. Because of this a Single phase machine will Hum or Vibrate much more and at a lower frequency than a 3 phase machine.
artv:
Hi all ,you guys are the greatest been doing some reading ......from what I understand ,elecron flow is instantaneous,,if you send electrons one direction ,next to a conductor in the opposite direction .............this creates cancillation.......induction??......probably not reading things right ...........artv
DanB:
--- Quote from: artv on May 12, 2010, 07:08:07 AM ---Hi Flux ...single phase with (9 coil, 12mag)...is it all the coils are hooked in series one right after the other?Three phase every third coil hooked in series? So single phase is basically one coil, Three phase basically three coils.This way the three phase would be better because it creates less heat being its' only producing 1/3 of the time,compared to single which produces all the time?When things get hot effiecency goes down.......don't know if I'm reading things right...........artv
--- End quote ---
Hi Art.
you cannot have single phase with 9 coils and 12 magnets. In order for 2 coils to be in phase, they must be seeing an 'identical magnetic situation' (not sure how else to say that) - which is impossible with 9 coils spaced evenly around 12 poles. But - with 9 coils around 12 poles, then 3 of those coils are seeing an identical situation and they are therefor 'in phase' with one another.
artv:
DanB....when the three coils ,seperated by 120deg.(one phase) ............the leading leg (of all three coils)see the same magnetic polarity............producing electron flow all in the same direction added together (in series) ...but hit trailing leg electron flow induced is opposite direction....but because when field collapses in leading leg............this addes to the trailing leg............when mag leaves the leading leg, the induced flow reverses..............this is back emf...............n/s hit leading leg,inducing flow ,exit leg,flow reverses ,s/n hit leading leg as n/s hits trailing leg adding to the original reverse flow caused by the n/s leaving the leading leg....................artv
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