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Hi all.
Not sure if this is the right sub-forum but I hope to start this thread for 10-coiler-kit-owners to share notes and hints.
My version of the kit is the one with 4 strands per coil (except for the master-coil with 5 strands).
I have built a few motors before trying different sizes and driving circuits but never tried to achieve high COP in the battery (until now). Some of my previous experiments winded up here: http://www.youtube.com/user/nilrehob
I don't have good batteries yet, I have 4 not new 90Ah, they are not all that bad but rather low quality and I'm currently trying to rejuvenate the first of them, but charging it takes quite some time and COP is probably close to 0.5, but I'll continue to charge/discharge it until I see a difference, hopefully to the better.
On the primary side I currently use a 25A 12V power-supply with 2 big caps in parallel. It seems to work pretty well, my scope (old) doesn't show much of the spike but there is an overload-indicator, so by adjusting the trace up/down I can see at what level the indicator turns on/off and using a battery or the power-supply doesn't make much of a difference spike-wise, I estimate that the spike to be above 220V.
If I stick to the rule of high RPM and low Amp I can tune it to draw less than 2A, but then the spike is low, sometimes 70V depending on secondary battery, and it seems the 90Ah battery won't charge, so I'm aiming for at least 4A. When a secondary 90Ah battery *is* charged then 2.2A seems to be the low limit to raise the voltage back to 16V.
I put a cap instead of battery on the output and bleed it with a resistor to find good efficiency. First I searched for a good gap between magnets and coils. It seems the wider the gap the better, until there is no trigger signal, so I settled for 6mm. (My best electrical COP in this setup for 6mm gap is 0.8 running on 2 coils, 100mA, 126 RPM.) Speed seems to consume unnecessary energy, so I have adjusted the position of the master-coil to trigger later to make the wheel run slower (in attraction-mode). In this way I get fewer but higher spikes for the same input amps. Higher input voltage seems beneficial, so I will probably aim for 24V when I buy proper batteries (once i can afford it).
Double-triggering seems also beneficial, but I'm sticking with single-trigger for now.
The 1-coiler kit John has put together seems to be charging a 24Ah battery and consuming 1A from the primary, which multiplied by 10 fits well with his 10-coiler that seems to draw 10A. But does the preferred secondary battery size scale likewise to 240Ah for a 10-coiler?
Does anyone have a suggestion on the size of new batteries once I can afford them?
/Hob
Not sure if this is the right sub-forum but I hope to start this thread for 10-coiler-kit-owners to share notes and hints.
My version of the kit is the one with 4 strands per coil (except for the master-coil with 5 strands).
I have built a few motors before trying different sizes and driving circuits but never tried to achieve high COP in the battery (until now). Some of my previous experiments winded up here: http://www.youtube.com/user/nilrehob
I don't have good batteries yet, I have 4 not new 90Ah, they are not all that bad but rather low quality and I'm currently trying to rejuvenate the first of them, but charging it takes quite some time and COP is probably close to 0.5, but I'll continue to charge/discharge it until I see a difference, hopefully to the better.
On the primary side I currently use a 25A 12V power-supply with 2 big caps in parallel. It seems to work pretty well, my scope (old) doesn't show much of the spike but there is an overload-indicator, so by adjusting the trace up/down I can see at what level the indicator turns on/off and using a battery or the power-supply doesn't make much of a difference spike-wise, I estimate that the spike to be above 220V.
If I stick to the rule of high RPM and low Amp I can tune it to draw less than 2A, but then the spike is low, sometimes 70V depending on secondary battery, and it seems the 90Ah battery won't charge, so I'm aiming for at least 4A. When a secondary 90Ah battery *is* charged then 2.2A seems to be the low limit to raise the voltage back to 16V.
I put a cap instead of battery on the output and bleed it with a resistor to find good efficiency. First I searched for a good gap between magnets and coils. It seems the wider the gap the better, until there is no trigger signal, so I settled for 6mm. (My best electrical COP in this setup for 6mm gap is 0.8 running on 2 coils, 100mA, 126 RPM.) Speed seems to consume unnecessary energy, so I have adjusted the position of the master-coil to trigger later to make the wheel run slower (in attraction-mode). In this way I get fewer but higher spikes for the same input amps. Higher input voltage seems beneficial, so I will probably aim for 24V when I buy proper batteries (once i can afford it).
Double-triggering seems also beneficial, but I'm sticking with single-trigger for now.
The 1-coiler kit John has put together seems to be charging a 24Ah battery and consuming 1A from the primary, which multiplied by 10 fits well with his 10-coiler that seems to draw 10A. But does the preferred secondary battery size scale likewise to 240Ah for a 10-coiler?
Does anyone have a suggestion on the size of new batteries once I can afford them?
/Hob
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