If Google doesn’t help, it may result in less voltage ripple (as the extra lobes can be humped out of phase with the first triad of humps...)What does the dual stator set-up do for me? More current output capability for given mechanical size?
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Looking again at the diagram, there is an 'M' terminal, where does that go/come from?
1sr - Nice data.I took some scope captures of my alternator voltage and current. It looks like the ripple on the alternator at idle is ~80mV and doubled to ~160mV when the alt heated up and was sourcing decent amount of current, all at idle. Is this good...? 100mV-200mV feels "pretty" okay-good, but I don't have a lot of experience with good/okay/bad alternator performance. Let me know your thoughts! See waveforms below.
I think my alternator output at idle might be maxing out at around 70A-80A, as the voltage was coming down to ~12.7V-12.9V at that point. I hope do do some more testing on this parameter in the future!
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Ripple measurements look very good, perhaps that is due to the dual stator.
When your voltage drops to 12.8-12.9v then you are at maximum output. Out of interest, how are you applying load when testing?
What was the RPM?
what are the X the divisions?
It should be possible to see 3 sets of diodes… or 6 if is two stators in a staggered arrangement.
2400 RPM is using pulley ratios?This is a fun little discussion.
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edit.... updated math.
If I was at lets say .... 2400 alt RPM... that would be one alt rotation every 25 milli seconds? (help me out here)
In the scope capture I have 20 peaks/"ripples"/rectified sines in 7 milli seconds, so I would have ~71 peaks/"ripples"/rectified in 1 rotation (25 milli seconds).
Is that right?... feels like I might be off somewhere there.
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2400 RPM is using pulley ratios?
Then divide by 60 to get to RPS and we get 40/sec.
so 3 stators would be 120/sec and 6 would be 240/sec. (8 amd 4 milisec)
There is also probably a factor of 2 as the negative voltage get put upright with the diodes… so 4 and 2 milliseconds respectively.
To get from 2 to 25/71 requires something like a 6:1 pulley ratio??
In cosmology it is exact!Thanks, I think our maths agree. I feel like we are just off by a factor of 2x or 3x or 4x. That's pretty close right?
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I think a generator has magnets and an alternator uses coils to create a magnetic like a magnet would... then they can change the strength of it to make the output go higher or lower?...
What makes the voltage peaks/"ripples"? It is the physical passing of a the rotor magnet pole passed a stator coil, correct? And then the negative voltage gets put upright with the diodes, so 2x peaks/"ripples" each time a magnet pole passes a stator coil. So the number of peaks/"ripples" per given time period is related to the RPM/RPS of the alternator, and also the physical # of rotor magnet poles and the # of stator coils..... hmmmm. Maybe? Could you multiple these together 2x to get the number of expected peaks/"ripples"?