Pierre's 170W in 1600W out Looped Very impressive Build continued & moderated

[seaad]

Why no fields in this places ?

You must compare it with the video part 3 or 4 by Pierre

Can you give the time points (about) in these films Thanks. And how to see that flux is missing?

Regards  Arne

[r2fpl]

Can you give the time points (about) in these films Thanks. And how to see that flux is missing?

Regards  Arne

you can see it almost any time
e.g.13:40 part 3

[d3x0r]

you can see it almost any time
e.g.13:40 part 3

there's also a null on the opposite side... I thought it was only 2 gaps 180 degrees opposed; but I see the other near gap you're mentioning...
weak coils? 
The rotor is also in it; is it there, but lost into the pickup?

[pmgr]

pmgr

Hi pm.
I just finished my stator build and i measured my coils inductances. It is L=7.52mH per coil. Each coil (22 awg) is of a 22.5m length (73T) and this gives me a 1,1 Ohm resistance. The maximum frequency according the equation is about 25Hz. So i wonder if there is any trick that i can do so to raise the frequency up to 50Hz. Any idea?

Regards
Jeg

ps. In resistance calculator i measured just the ohmic resistance and not the reactance of the coil. Reactance at 7,52mH and 50Hz is 2.3 ohms. If i add it with the ohmic resistance then i am again in the right range. But is that a valid consideration?
Thanks

Hi Jeg,


You should measure the inductance with and without the rotor in place for each coil. You should see an increase in inductance the closer you get to the rotor, typically a factor of 4 compared to the minimum inductance when away from the rotor.


Pierre's relays are running at around 4Hz, so I don't think your numbers are going to be a problem.


PmgR

[Jeg]

Hi Jeg,

You should measure the inductance with and without the rotor in place for each coil. You should see an increase in inductance the closer you get to the rotor, typically a factor of 4 compared to the minimum inductance when away from the rotor.

Pierre's relays are running at around 4Hz, so I don't think your numbers are going to be a problem.

PmgR

Hi Pm
Thanks for the suggestion. These days i will test the relay boards to take an idea for the consumption current. I'll report my findings as for a reference.