TinMan Generator Research Moderated Topic

[Jimboot]

Thanks Erfinder.


A few things I've learned today.
I used one of my pulse motor circuits to drive the motor. Pretty ordinary performance.
I shorted the stator coils using a reed. Not much joy there. Lowered the output.
On the upside I found that with more area of the brush making contact the greater the output and therefore lower current draw ( I love that new law)


My motor unloaded draws about 2.1A loaded 1.5A . That's having the stators in series. More speed does not necessarily equal more output. Now i think I need to go and get a washing machine

[gyulasun]

Not sure why my last post(like Luc's last post) is highlighted as a quote.?

Hi Brad,

It remained as a quote because there must have been a   /quote  symbol left as the last line and you started your answer above that last line.  Just place that symbol above the line of your answer, using the Modify icon on the right side of your post.


Regarding the schematic on Luc's setup:  I think the input DC voltage going to the brushes is interrupted by a MOSFET so that the rotor coil is between the drain of the MOSFET and the input positive battery rail, and the MOSFET is controlled by a function generator between the gate and the source pins.  The positive rail goes to the lower brush of the motor as shown in the video and the flyback diode is connected to the upper brush which is also the drain of the MOSFET, as I see it in the video.

EDIT  the    /quote    symbol is embraced with these two brackets of course:  [ ] 

Gyula

[tinman]

Hi Brad,

It remained as a quote because there must have been a   /quote  symbol left as the last line and you started your answer above that last line.  Just place that symbol above the line of your answer, using the Modify icon on the right side of your post.


Regarding the schematic on Luc's setup:  I think the input DC voltage going to the brushes is interrupted by a MOSFET so that the rotor coil is between the drain of the MOSFET and the input positive battery rail, and the MOSFET is controlled by a function generator between the gate and the source pins.  The positive rail goes to the lower brush of the motor as shown in the video and the flyback diode is connected to the upper brush which is also the drain of the MOSFET, as I see it in the video.

Gyula

I have a feeling that what i consider to be flyback is different to what Luc considers to be flyback.
To me,in order to get flyback,or inductive kickback,the coil has to become open. As the coils on the rotor are all interconected,they can never become open to produce a flyback<-- as i know it to be.
I believe what Luc see's as flyback in this situation,i see more as being a stepup transformer action.

Anyway,i am surprised to see that cap charge up so high in his demo video.
It is good to learn something new. Now i will be interested to see if he can make it work without the PWM,and by adding that second set of brushes to catch this high voltage-!what ever it is!

[gyulasun]

Hi Brad,

It is okay that you consider a coil  has to become open to get the flyback pulse across it just after interrupting the current in the coil.  It is also okay that in a rotor the coils are all in series ring so in this sense they are never 'open'  BUT consider the two brushes always see a certain L inductance which always consists of  two 'half circles', one on the left and the other on the right direction and these two 'half circle' of series coils are connected in parallel with each other as the brushes see them, ok?
So the result is that there is always a resulting L inductance towards the 'outside world'  and whenever a current is interrupted in any L inductance, the voltage spike occurs, no matter if there are shunting coils in parallel.  By the way the Teal patents deal with paralleled coils if I recall correctly.

Gyula

[Grumage]

Dear All.

Brad's " Brush tipping " pictorially.

Automatic coil shorting ??   

Cheers Grum.