For what its worth this is the worlds best science using ramped magnetics.
http://www.spacemart.com/reports/25_Tesla_world_record_split_magnet_makes_its_debut_999.html

@plengo

Current and voltage have amplitude and phase. You have measured current amplitude so if you dont get 160mA with 2 coils in place maybe you have a current phase shift between the 2 coils. You can check this with one 2-channel scope measuring a low value resistor in series between each coil and load  to get voltage from current reading. You must have 2 coincident waveforms in time, if not you must move one of the coils till you get this , the same applies for output voltage.

Quote from: wattsup on July 28, 2011, 07:22:42 PM
Even though the second coil does not have the same or higher Vout, it is still adding to the available Iout.

Only if a load is draining your Dump Cap fast enough!

Vout can only send current to your load and/or Dump Cap when it becomes greater than the FWBR diode Vdrop + the V that is in your Dump Cap.  For example, if I have 9 V in the Dump Cap, and 1 V drop due to the FWBR, that is a total of 10 V on the output side of the gen coil circuit.  You cannot charge a 10 V potential unless your Vout from the gen coil reaches > than 10 V.

So if coil pair number 1 is putting out 10V, it will be charging the Dump Cap.  If coil pair number 2 is only putting out 9V it will never be able to send current to the DumpCap and is just wasting that potential.

So I think it is critical to tune each coil pair output to have the same Vout for the most efficient use of two or more coil pairs.

If your load is big enough it may drop your Dump Cap V from that 10V supplied by coil pair 1 down below the 9V threshhold required for coil pair 2 by the time coil pair 2 is pulsed by the next passing magnet and thus allow for coil pair 2 to supply some current.  But the maximum Vout it can supply is now not enough to top off the Dump Cap to the same level as coil pair 1, and so coil pair 1 is still doing most of the work.

This balancing of Vout levels from each coil pair may have been part of the tuning that RomeroUK had to deal with.

M.

Quote from: mondrasek on July 29, 2011, 09:00:24 AM
Only if a load is draining your Dump Cap fast enough!

Vout can only send current to your load and/or Dump Cap when it becomes greater than the FWBR diode Vdrop + the V that is in your Dump Cap.  For example, if I have 9 V in the Dump Cap, and 1 V drop due to the FWBR, that is a total of 10 V on the output side of the gen coil circuit.  You cannot charge a 10 V potential unless your Vout from the gen coil reaches > than 10 V.

So if coil pair number 1 is putting out 10V, it will be charging the Dump Cap.  If coil pair number 2 is only putting out 9V it will never be able to send current to the DumpCap and is just wasting that potential.

So I think it is critical to tune each coil pair output to have the same Vout for the most efficient use of two or more coil pairs.

If your load is big enough it may drop your Dump Cap V from that 10V supplied by coil pair 1 down below the 9V threshhold required for coil pair 2 by the time coil pair 2 is pulsed by the next passing magnet and thus allow for coil pair 2 to supply some current.  But the maximum Vout it can supply is now not enough to top off the Dump Cap to the same level as coil pair 1, and so coil pair 1 is still doing most of the work.

This balancing of Vout levels from each coil pair may have been part of the tuning that RomeroUK had to deal with.
M.

@M

First off I am glad you did not take my last post in any wrong way as I did not want it to sound negative and was hoping it did not. You are doing some good work and it is very appreciated.

About the output of coil 2, as long as it passes the fwbr it is dc and additive if not in volts, in current. Yes you will not see the voltage rise on the dump cap but if there was a small load, it will have more amperage. Maybe try to put your two fwbr DC outputs in series and you will see the real total voltage rise every time.

Keep up the good work.

wattsup

@M : Is that RMS Voltages you talk about?
If the peak2peak voltage of the 2nd coil pair is higher than dump camp voltage + FWBR drop then you will have current pulses.
It's actually easiest to observe what is going on if you put a 1 ohm resistor between the 2nd coil pair's FWBR and the dump cap and put the scope across
that way you see the DC current pulses.