Setup/Tuning Multicoil Machines

[James Milner]

Thanks John, Mikey and others.
My transistors are matched for each coil as are the base resistors.
I did notice that the waves differed slightly in shape indicating slightly different capacitance and impedance.
Slight mismatches in spacing will show up as a periodic wobble which makes sense

The phase shift has got me stumped so far.

The only thing I can think of is I found myself short on matched transistors. So I'm running 1 coil with 8 power strands and one with 6. The remaining strands (1 power,1 trigger) left unconnected.
Theoretically I can't see how that would affect the phase. But I'll keep testing and experimenting until. I find out the reason. I will post when I find out

Thanks
James

[Branch Gordon]

Just thinking for the future here...but what would be the ideal setup to scale up to charging 225AH batteries?

A larger coil with more windings, or a couple slave coils? Or would I need more power even than that?

If you use a single trigger on the "master" coil then the "slave" coils will all fire at the same time. The only "phase lag" you will get is if the transistors and base resistors aren't matched.

If the coils don't match it will only affect the shape of the "h" wave. Even if the slave coil is mounted EXACTLY 180 degrees from the master coil there will be inefficiencies if the magnets are not spaced PERFECTLY apart on the rotor. This inefficiency will slow down the rotor.

Multi-coils are fun to experiment with, however a single coil with double the windings than a dual-coil machine will eliminate the inefficiencies mentioned above. I.e. a single coil with 8 windings will perform much better than 2 coils with 4 windings.

John K.

[John_Koorn]

If you use a single trigger on the "master" coil then the "slave" coils will all fire at the same time. The only "phase lag" you will get is if the transistors and base resistors aren't matched.

If the coils don't match it will only affect the shape of the "h" wave. Even if the slave coil is mounted EXACTLY 180 degrees from the master coil there will be inefficiencies if the magnets are not spaced PERFECTLY apart on the rotor. This inefficiency will slow down the rotor.

Multi-coils are fun to experiment with, however a single coil with double the windings than a dual-coil machine will eliminate the inefficiencies mentioned above. I.e. a single coil with 8 windings will perform much better than 2 coils with 4 windings.

John K.

[BobZilla]

Hi James,
I am about to start experimenting with a system very similar to what you are describing. I have not run my new machine yet but hope to have it running very soon. I completed my circuit board last night and still need to mount my coils.

I am going to start a new thread about the machine when I get it running but along the lines of this thread it will have two coils each with 4 strands of 18AWG and one trigger of 20 130ft. These are the coils from teslagenx. I plan to experiment with running both triggers but I had envisioned normal operation with only one and perhaps use the other as a generator coil.

On the circuit board I have configured the transistors in two banks of four, all 8 were matched however. I have switches setup so that I can send the output too separate batteries or combine into a single output. Put another way I can have a branch circuit output or a single output. All of the base and emitters are parallel but the collectors are split into the two sets. I will elaborate more in a thread about the build. Heck I have not even fired it up yet so not much to say other than I hope it all doesn't just go poof ;-)

[kevin72]

James,

I like the idea, perhaps you can add a schematic or picture (showing the area your having a problem). This way its easier to follow along as well as sharing ideas on what a bigger SG looks like from different perspectives an materials.

Kevin

[James Milner]

Brodie,
You are correct. I was leaving the other trigger unconnected. Yet when it didn't work. I used the trigger to help investigate the reasons why it wasn't working properly. I would never had noticed the phase difference otherwise.
James

[Brodie Gwilliam]

are you saying you have a trigger winding on each coil? you should only need one trigger wire alltogether

[James Milner]

PHASE LAG

Hi all,
Although I have successfully set up a superpole running two 5 filar coils, I think that it was more by chance that it worked successfully.
I wanted to start a new thread to explore the intricacies of setting up and problem solving issues associated with primarily multicoil monopoles. Although I suspect superpoles would be the same.
Just to make following the issues easier can I suggest starting each reply with a suitable heading relating to the issue covered so that when others follow the thread at a later date that searching through to the problem being discussed is clearly identified.

My first issue is running two coils on opposite sides of the wheel. I have tried linking them together by connecting the trigger from the first to the trigger rail of the second.
What i get is a slowing of the wheel and generation of heat from the transistors on the secondary coil (like repulsion mode). I have also tried a pot in series to adjust for variation in the trigger required between the coils, although unsuccessfully.
Both are wound counter clockwise (attraction mode) and both work well independently.
I am able to run them simultaneously with independent triggers and it generates quite some RPM, the interesting thing is that running dual traces on the Oscilloscope I find that the H waves on the collectors (one on each coil) are out of step by 2.2msec. 2.2msec is about 1/3 to 1/2 of the H wave out of step. This would explain the heat given off by the transistors on the second coil when connected together as it would be fighting against the motion of the wheel. This also reduces the effectiveness of adding the coincident pulses together when run independently.

While the easiest solution would be to buy more transistors and match all the proposed 70 devices (10 coils, eventually) and the resistors and diodes etc, by the time we finish it could be a very very expensive exercise. So I think we need to work out how to tune coils with independently matched sets.
Has anyone else seen this phase lag when dealing with multicoils in the past? What causes it? The coils are aligned correctly by the way so it is not related to being off centre! I've tried twisting the coils off centre to experiment with potentially varying the phase lag to no benefit or change.
Thanks
James