Sharing ideas on how to make a more efficent motor using Flyback (MODERATED)

[sm0ky2]

Shouldn't that be ?:
Bringing a secondary field (PM or EM) near some cored coils will increase their inductance AND permeance.

hmm,.. I may be wrong, if so feel free to correct me, but
I believe, (below the curie temp), the presence of a permanent magnet will lower permeability of the core.
as the PM field wants to resist change, and already saturates the core.

a momentary measurement of permeance, or perpendicular flux density will show a higher value than without the magnet
however, the change in flux is lower and opposed by the PM field

[verpies]

I believe, (below the curie temp), the presence of a permanent magnet will lower permeability of the core.
as the PM field wants to resist change, and already saturates the core.

That is true most of the time and for isotropic cores.

However when the permanent magnet magnetizes certain anisotropic cores in a direction that is different than the direction of the coil's field, then the permeability, permeance increases.

[verpies]

I would need help to find a simple software that I could print a circle of up to 6 inches (15cm) in diameter on white paper. It needs to be pie shape in black for my optical reflector switch off times.

Wouldn't this be less work and far more accurate?
http://tinyurl.com/hpw5jfk

[gotoluc]

Wouldn't this be less work and far more accurate?
http://tinyurl.com/hpw5jfk

Yes, far more accurate that's for sure but time spent to find or make couplers to adapt to the shaft of what ever you build or test.  Then if I decide to go to 3 phase I've got to get another model. 

For now I'll stay with the cheap option and flexability of optical reflective switches and will keep the rotary encoder switch for the final design.

Thanks for the suggestion.

Luc

[verpies]

Yes, far more accurate that's for sure but time spent to find or make couplers to adapt to the shaft of what ever you build or test.

That might be true if the shaft is mismatched to the hole

Then if I decide to go to 3 phase I've got to get another model. 

Oh no.  This encoder generates 360pulses per revolution, so you can use it to trigger at any angle and as many times per revolution as you want.

For now I'll stay with the cheap option and flexibility of optical reflective switches...

Do you realize, that it is also possible to have a fixed optical reflective switch with only 1 pulse per revolution anywhere, and electronically divide the time between these single pulses into 360 equal periods using the 4046 chip and some counters, in order to trigger at any shaft angle degree and as many times per revolution as you want ...without a shaft encoder ?