Muller Dynamo

[konehead]

Hi Joe

Yes those SSRs are slow plus they have huge resistance - you cant short coils wtih them at all becaseu of the huge resitance to them -but they work good for some things as long as its not too fast.

I am confused as what you do when you short the coils 9 times at peaks in your video - are you actually shorting/"unshorting" them as you call it?
Or is this a 9times-discharge to load thing??  I dont see the coil-shorting schematic in your video, jsut the backemf-collection one at the very first....then yo go to test 2 and are now doing t he 9 "shorts" but is this a different circuit and is it really shorting?

Also if it is shoring 9 times a peaks, are you then abandoinng the backemf circuit that you use originally, or combining the two types, and/or have you replaced the backemf/colleciton circuit with the coil shorign one, so that you are coil-shorting the backemf "out"??

IF so, what is the timing of the coil-shorting in the sinewave and compared to motor coil pulse???
Is there some overlap in ON-TIME with the motor coil pulse being on? Is it right afterwards with no overlap?

Or is your 9 times thing jsut doing the cap disccharge to load 9 times really quick is all it is going on?

[konehead]

hi joe

one more thing, is that lets say you are running looper by way of you fill caps with swithcing, and run motor off caps with swtiching...the motor will be like constant pulsed-resistance across that "RUN" cap so you dont have to worry about going tto too high of voltage in cap and blow it, the motor coils will always be dragging down the cap voltage as motor runs...for instance run 2nd motor off the caps you ar filling right now as experiment - so what I am saying is taking cap up to 200V isnt probably a good test to be doing in real world conditions - more like double the voltage that you are unning motor on would be betteris all yo uwant to go to - the discharge cap - final "step" will probalby be to dump what you make in caps into cap running motor and if you have double votlage, then when you dump cap into other "RUN" cap you will split votlage levels.... so anyways if you do what I jsut did and run motor off cap, and once a revolution dump battery into cap, this will tell you the size of cap you need to run motor (1300uf wonrun mine at good seppe 2000uf is OK buta bit slow and  3500uf is good I figure) ....so now if I can jsut fill up that size cap up once a revolution to twice the votlage of what it takes to run my motor (10V to run so 20V in cap) I should have looper...and it at least gives me a target to acheive in what size cap and how fast to fill...

also when cap fill up the resitance to fill them is way less - so everythign changes as caps fill up ....also much much easier to fill cap to 100V if there is already 20V in it or so as compared to zero volts...and same if you see no "speed reduction" in rotor when cap is finally at 200V - that doesnt really matter - -  if you get speed reduciton when you fill cap to 10V to 50V for example is what matters- or if you dont get speed reduction when cap fills up from low voltage after cap discharge is what really matters.....so anyways the cap fillign and discharging is what you want to be "checking" the rest of the system "during" - not so much the cap at a high voltage not pulsing out to anything....

[joefr]

Hi Kone

I will explain what I am doing in the video. First look at the schematic. I am not using coil shorting. I am doing everything with Q1 Mosfet ( 2 in parallel ) and drive coils L1 and L2 ( no generator coils used ).

When rotor magnet ( all south pole oriented ) passes across hall sensor I turn Q1 and coils OFF for 10uS then ON for 400us and again OFF for 10us ...... 5 times during the time magnet passes Hall sensor.

When magnet is OFF the hall sensor I turn the Q1 ON and coils ON.

This config now works the best at charging C1 680uF CAP to 200V in 10 seconds.

Look at the scope shots

JoeFR

[geotrouvetout]

Hi joe,

great, it depend at what frequency max can switch the arduino's ports, 4N38, and TC 4421, the more ON-OFF that can be doing in the small time off of the hall sensor the less impedance of the generator coils is, then less time to charge the capacitor.

Geo

[mariuscivic]

Hi guys! 

Nice work everyone!!!

I try to keep it simple: http://www.youtube.com/watch?v=YL90Nmea0Mk