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

[gotoluc]

Hi Gotoluc,
Here is an end shot of the stator and rotor.

Thanks L192 for posting the picture

Note my coils are a little longer than I planned but they were wound for a 6 slot pitch in a slightly bigger stator.
I didnt want to wind up another set or spend time changing these so they would be tighter.

So from what I see and understand your coils are presently positioned in a 5 slot span but could be reused in longer 36 slot stator and positioned in a 6 slot span?

The rotor covers 9 poles, so induction will be over a wider range of arc.

If your stator has 6 poles and your pitch is 5 slots then I would think if your rotor core covers more then 4 of the T surfaces. then at all time you have 2 poles on each ends of your rotor core.
I think it would result in a very weak flux swing (change) in the rotor core and not induce much flux in the rotor coils?  Notice Pierre's rotor core (first pic) has only about 5 T surfaces coverage.

You can see that more than 36T x 2 could have been packed in these slots, perhaps 46T.
Regards
L192

Yes, I agree and I could of done the same to my stator which made me wonder why Pierre mentioned he had a hard time to fit the same wire gauge and turns I used in his  much larger stator. Something is not right!...  Have a look at the second picture of Pierre's stator. At 4 o'clock you can see the last winding (6 slot pitch) and behind it a bunch of wires away on the outer stator?... then at  5 o'clock a lager mass of wires which slowly reduces at 9 o'clock then starts to build back up again to 1 o'clock. Did you notice a large black wire at 12 o'clock?  I don't think we are building anything close to what Pierre demonstrated.

Regards
Luc

[konehead]

Hi Luc
here is your quote:
"I don't think we are building anything close to what Pierre demonstrated"
(!!!!!!!)

[Jeg]

I have 1 BTN7960 board coming

Looks robust enough. I am curious to read your review on this.

Why are you using separate arduino output pins for driving the below switches while they can be driven by sharing the same input with their mate switch at the above row?

[gotoluc]

Hi Luc
here is your quote:
"I don't think we are building anything close to what Pierre demonstrated"
(!!!!!!!)

Yes Doug, that's my quote for today!
Do you want me to call you?
Regards
Luc

[listener191]

Thanks L192 for posting the picture

So from what I see and understand your coils are presently positioned in a 5 slot span but could be reused in longer 36 slot stator and positioned in a 6 slot span?

If your stator has 6 poles and your pitch is 5 slots then I would think if your rotor core covers more then 4 of the T surfaces. then at all time you have 2 poles on each ends of your rotor core.
I think it would result in a very weak flux swing (change) in the rotor core and not induce much flux in the rotor coils?  Notice Pierre's rotor core (first pic) has only about 5 T surfaces coverage.

Yes, I agree and I could of done the same to my stator which made me wonder why Pierre mentioned he had a hard time to fit the same wire gauge and turns I used in his  much larger stator. Something is not right!...  Have a look at the second picture of Pierre's stator. At 4 o'clock you can see the last winding (6 slot pitch) and behind it a bunch of wires away on the outer stator?... then at  5 o'clock a lager mass of wires which slowly reduces at 9 o'clock then starts to build back up again to 1 o'clock. Did you notice a large black wire at 12 o'clock?  I don't think we are building anything close to what Pierre demonstrated.

Regards
Luc

Hi Gotoluc,

36 slot stators have much less slot CSA than 30 slot stators, so I think he would have had a harder time. Also he may have been using thick nomex slot liners.

Mine are made with 0.13mm nomex which is a little thin for the job.

Regards

L192