Quote from: teslaalset on June 06, 2011, 05:13:26 AMso 8 rotor magnets, 2x9 stator coils/bias magnets.

But in roms setup there are (2x)5 bias magnets seen on the pics (drive coils and some gen coils are w/o mags), and the rest are of *very* uneven strength arranged in certain pattern. This is clearly seen on the pictures.
So to make it clear you did simulate the "generator only" setup with all the coilpairs biased to very high  precision with uniform bias strength on all the coilpairs. Am I correct?

Quote from: teslaalset on June 06, 2011, 03:29:08 AM
I did some Ansys Maxwell simulations on the biasing mechanism with some pretty interesting results.
The sum of the BEMF forces in tangential direction can be cancelled out completely by adjusting the stator biasing magnets with very high precision. (+/- 0.25 mm !!).
The sweet spot to obtain this point is extremely sensitive. 0.25 mm off and the effect is gone.

It is very important to understand that the exact adjustment is done under a specific load.
If the load is changed after adjustment, you will lose the cancellation of the BEMF forces.
This is what RomeroUK also pointed out.
In practice, if you have succesfully adjusted all bias magnets and start up your replica without any load, obtain a certain RPM and then turn on the load, the RPM should increase.
If you don't obtain this effect, your biasing adjustments are not correct, or you have too large spread in components.

So, what is a handy way of determining the optimum positions for all of the 18 biasing magnets?
In practice, you'll have to start up your rig with the required load and then adjust the bias magnets such that you obtain maximum RPM.

So, I like to emphesize again that in a setup with 8 rotor magnets you can only obtain an optimum when all rotor magnets have same strengths. If the spread is too large it will never work.
This is due to the very critical distance of the bias magnets.
Even the spead in strength of the biasing magnets will count heavily.

A copy of some additional explanation I posted in the experimenters discussion thread earlier:
(see figure below)
If Rotor magnet RM1 is facing the stator coil, the optimum is tuned by Stator magnet SM1.
Then rotor rotates and rotor magnet RM2 faces the same stator coil.
But RM2 has different strength compared to RM1 (0.95T versus 1.05T).
Then the position of SM1 should be tuned again for optimum drag, which will spoil the optimization for RM1.
So only an avarage optimum position can be obtained.
If RM1 would have same value as RM2 than optimization would be perfect.

If you don't pay attention to this, you will never get to the required conditions.

Thats going to take a lot of understanding and maybe some people will never
find it.   

if this is what RomeroUK discovered it may never be rediscovered with out an accident.

it does explain the DC to DC converter. I have never really been happy about why it was there but this explains it.

how do you know what direction to go in. How do you read the signs. 

Hello RomeroUK
I got speed under load. But If it was the way you did it I will never know. Thank you for your recent Post and brutal honesty    

The green wave form represents the AC voltage being generated by one generator coil pair before the bridge rectifier. This is what the AC wave form looks like before we short or load the coils.
The yellow wave form represents the timing of the trigger pulse of exactly where the MOSFET transistor will be switched to engage a dead short across the green wave form, being the generator coil.

Attached is a photo of my recent contraption to test pulse motor drive concepts. At the moment I play with "trigger coils" (see the attached circuit diagram).

The circuit was published some time ago by I person calling himself "gecernu" http://www.youtube.com/user/gecernu

The coils are from 12 V relays.

I will report results, I just got it running. I think it is a good idea to approach the whole Romero-Generator subject by starting with very simple contraptions and to expand to a full build later.

Greetings, Conrad

Quote from: yssuraxu_697 on June 06, 2011, 05:29:27 AM
But in roms setup there are (2x)5 bias magnets seen on the pics (drive coils and some gen coils are w/o mags), and the rest are of *very* uneven strength arranged in certain pattern. This is clearly seen on the pictures.
So to make it clear you did simulate the "generator only" setup with all the coilpairs biased to very high  precision with uniform bias strength on all the coilpairs. Am I correct?

At this moment I have done only calculatons on the full generator part, so all stator coils being a generator, just to understand the generator part first.
What I showed in reply #2524 is a part of the complete model that I took out, so, one stator magnet, one bias magnet and one moving magnet underneath the stator magnet, just to understand the principle and to speed up simulations. It takes hours to run a simulation if I take the complete rig as model.

I agree that RomerUk did not use all bias magnets, so he might even have more margins in there.
I simply wanted to understand the effect of the bias magnets in general first, before going into the next step.

It's funny, but with a perfect build the motor coils only have to compensate the natural losses, like bearing, eddy current and air flow losses. What you get out of the generator coils is pure surplus of energy if you can minimize the natural losses sufficently.