Muller Dynamo

[konehead]

hey Arthurs...

yes you will have lowest draw with 2nd version of the motor coils being in series - not neceesarrily better effeciency as yo see the speed drops in consequence - maybe paralell is better rather than seres and yourmotor runs much faster so gernator coil s make more... you have to try all these things out see what works best for your particular machine.....

you will get better effecinency when you do another pair of coils as motor coils, like romeor does, as this gives more speed and not much added draw at all at least that is what I get and most everyone else will probalby agree that the two pairs of coils both facing pairs working as motor coils makes a better motor of it..

Also try putting magnets behind each of your motor coils...I got draw to go down almost by 1/2 doing this, with same speed as without the magnets behind the cores.

also later on with your motor coils, you might want to set up a "backemf/recoil recovery" circuit, where you gather the energy that shoots out of the coil backwards, right at the time that the coil is turned OFF.

A very simple and quick way to see what "you have" to gain, is to put a FWBR AC legs right "across" your transistor or mosfet - one AC leg on the drain, one on the source...and put the DC side of the FWBR straight into a (for example) 10uf 450VDC capacitor.....you should get near instantly 200V, and it will climb to 300 or so and draw to motor is not affected...there is more to do with this, but it gives you idea what is there and is normally "wasted" so put it into caps then pulse caps into some sort of load when cap is disconnected from the coils that fill them so it doesnt reflect back to  the motor draw when the caps hit load...bigger caps in uf value will fill slower but you have more oomph on the discharge....you want to find cap size that doesnt lug motor draw upwards when the cap fills, but not so small that you dont capture everythign that you can.
Use a scope look at the big spikes at turn-off of the motor coils, look to see them dissapear and go into capacitor when you get this working right....maybe Romero did somethig with his backemf influencing his gernator coils so they made more power - dont know...

[Rawbush]

Alright, had to make a new rotor because the first one developed a crack and I wiggled it and a big piece of rotor (arcylic) broke off. Check your rotors periodically. New rotor is now 6 magnets (was 4). I am going to switch to sewing bobbin coil but ran a test run with relay coil. Now I don't know for sure what I am seeing on the scope, but it looks like at certain speeds the gen coil resonates?, and you get a second wave on the scope. I took a bunch of pics with the phone, but it looks like it doesn't capture all of it. Here are some pics (links), what am I seeing?
Peace
rawbush
http://i259.photobucket.com/albums/hh315/rawbush/IMG_20110706_105041.jpg
http://i259.photobucket.com/albums/hh315/rawbush/IMG_20110706_105023.jpg
http://i259.photobucket.com/albums/hh315/rawbush/IMG_20110706_104942.jpg
http://i259.photobucket.com/albums/hh315/rawbush/IMG_20110706_104737.jpg
http://i259.photobucket.com/albums/hh315/rawbush/IMG_20110706_105206.jpg
 

[starcruiser]

the multiple wave forms are the same signal just the Scope Horizontal time base is not set properly. try adjusting the timebase as I mention and this wave form will clear up.

[Rawbush]

That was the case, turned time down and cleaned right up. Thanks for the tip.  Now to make new five filler coil to test.
Peace
rawbush

[Dave45]

A couple of questions
if you find the resonance of an lc circuit then start to pull energy from that circuit wont it change the resonance. I think you definitely need a scope to tune the coils at load.
What bother's me is how to control rotor speed (frequency).