Circuit setups for pulse motors

[kubikop]

Any ideas on the neodymium magnets?

Anyone? Ive been told not to use them?

[Nastrand2000]

The other reason the motor will draw more or less amperage is coil saturation. When the coil is brought closer to magnets, it is not able to let current flow through it as easily (if you are using a repeling force from the coil). So for any given distance the coil will consume less energy the faster it goes. As far as using neo mags, I personally have never had a problem. If you are using an metal core in the center of your coil, the problem that I believe you are referring to is core saturation. This is why ferrite magnets are used in things like Bedini's school girl motor and other similar design. If you have checked out my videos then you can see that I'm able to use very large neos with no problem, yet this is also why I use air coils. Hope this helps.
Jason

[Ren]

neo's seem to have worked well for a number of people including myself. Perhaps the suggestion against them was directed towards beginners who may have found them more difficult to affix to rotors etc. I have found one instance however where the rotor ceramics were replaced with neo's and it reduced the speed (not necessarily a bad thing). The user didnt make any changes however, he just reverted back to the ceramics.

Perhaps the cores were oversized for the attraction power of the neo's, creating more drag at speeds. Then again Jason (Nastrand) doesnt even use cores and has obtained excellent results.

[Ren]

by the way jase, I need some help with the back emf capture. I followed your diagram, diodes included and I got nothing. without the diodes, just a line from emmiter and collector, I am getting spikes nearly as high as 200v (with my hand well away from the meter ). Funny thing is if I swap my meter around ( change meters positive from collector to emmiter etc...) it only goes to around 80 v. This is with one coil only.

I realised that pnp works different to npn so I reversed the diode order, off the emmiter and back to the collector and I can fill a cap this way to around 70 - 80v. Do you think my original reading of 200 v is just a miscalibration? or have I wired it up incorrectly? Do you send spikes through a bridge first? Or straight to a cap?.

[Ren]

by the way jase, I need some help with the back emf capture. I followed your diagram, diodes included and I got nothing. without the diodes, just a line from emmiter and collector, I am getting spikes nearly as high as 200v (with my hand well away from the meter ). Funny thing is if I swap my meter around ( change meters positive from collector to emmiter etc...) it only goes to around 80 v. This is with one coil only.

I realised that pnp works different to npn so I reversed the diode order, off the emmiter and back to the collector and I can fill a cap this way to around 70 - 80v. Do you think my original reading of 200 v is just a miscalibration? or have I wired it up incorrectly? Do you send spikes through a bridge first? Or straight to a cap?.