TinMan Generator Research Moderated Topic

[gotoluc]

Luc
Could you please post a quick schematic of your inductive kickback circuit,as i cannot get anymore than the input voltage out of the brush contacts. The only way i see you getting that sort of voltage out of the rotor is by way of making your rotor coils act as a stepup transformer. For example,if you had 20 turns on your rotor coil,then applying 12 volts,then switching that 12 volts off,you should be able to get around 240 volts out.
Also,please understand that my answer is in relation to you placing more brushes on the rotor to collect the flyback.

Thanks.

Hi Brad,

please find the attached circuit. Last night after doing more test I found by adding a second diode on the other stator coil which I had left open in the last two videos it helped to lower the current.

I think this method of collecting Rotor flyback would be as good if not better than trying to make a dual brush system.
Keep in mind the rotor coil is being fully turned on and off multiple times during the time the brush is on each commutator segment and at the frequency and pulse width of your choice. So I think this would be better and offer more flexibility then a physical dual brush system.

I would suggest you add this simple component to your v.3 RT and you may find you can further lower the input power.

Luc

[tinman]

Hi Brad,

please find the attached circuit. Last night after doing more test I found by adding a second diode on the other stator coil which I had left open in the last two videosit helped to lower the current.

I think this method of collecting Rotor flyback would be as good if not better than trying to make a dual brush system.
Keep in mind the rotor coil are being fully turned on and off multiple times during the time the brush is on each commutator segment and at the frequency and pulse width of your choice. So I think this would beet a dual brush system.

I would suggest you add this simple component to your v.3 RT and you may find you can further lower the input power.

Luc

Luc
You have included one of the stator coils,and that coil will become open when the mosfet opens.
I thought you wanted to know if you could collect a high voltage from the rotor only if you added more brushes to collect this mystery flyback from the rotor coils.
What i was trying to say(and have shown)there is no high voltage from the rotor coils just because you see arc's at the brushes. This voltage is very low,but the current flow is high when the coil is shorted by the brush.
You pulsing the coils is very different to using the brushes only,and trying to collect from that.To get any sort of higher end voltage,you would need some really crappy brush/armature contact.

[gotoluc]

Brad,

I don't understand the confusion.

First,  fact, any coil will produce flyback when the power source is disconnected, so the rotor coils are not exempted.

Second, my idea to collect the rotor flyback was because the input current is outrageously high when only the rotor coils are connected, so I was trying to lower it by using something that is normally wasted.

Third, if the stator coils are separate from the rotor coils, then why not direct the flyback in them and see if it can assist the rotor.

Forth, it does work and better than I thought so why not consider using it?

Luc

[Grumage]

Grum
The shorting of the coils via the brushes is somthing you cannot change-unless you make your brushes thinner than the gap between the armature segments. That shorting of the coils is actually good,as that is when you see the high voltage spike on the stator coil's,as a large magnetic field is produced from the rotor coil when the brush shorts that coil.

Here is a video where i am looking for the !so called! high voltage flybacks from the rotor coils.
As you can see on the scope-there is none,even though i can see the brushes arcing slightly. The arcs are from the brushes when they are shorting each coil-not from some high voltage arc,but from a high current due to the short.

I didnt get the second half of the video due to my PWM being fried. Will post it when it's repaired.
Enjoy the background scenery of my video from now on

https://www.youtube.com/watch?v=VlRiXMR9VAE

Dear Brad.

Thank you for those educational videos.

Cheers Grum.

[gotoluc]

I thought you wanted to know if you could collect a high voltage from the rotor only if you added more brushes to collect this mystery flyback from the rotor coils.

I knew before doing the test and obviously after doing the test that I can collect high voltage flyback from the rotor coils, irrespective of my original ideal of dual brushes. 

What i was trying to say(and have shown)there is no high voltage from the rotor coils just because you see arc's at the brushes. This voltage is very low,but the current flow is high when the coil is shorted by the brush.

Your test could not show the rotor flyback using just diodes. Attache a switch with a low pulse width with a flyback diode and the story will change.
I know the current is high and I now understand what your brushes are doing.

You pulsing the coils is very different to using the brushes only,and trying to collect from that.To get any sort of higher end voltage,you would need some really crappy brush/armature contact.

Not sure where you're going with this

Luc