Simple to make Hilden-Brand style motor

[Nali2001]

Mate, a good dip available full bridge driver is the HIP4081A (aka HIP4081AIP)
http://www.robotpower.com/downloads/HIP4081A-datasheet.pdf
more info about it:
http://www.intersil.com/data/an/an9405.pdf
High driving power as well.

They are a bit touchy and I have burned out like 5 already, never too clear why...
But you electronics skills is far better than mine so that should be no problem.
They don't really seem to like the flyback going to the prong places so keep an eye on that. Plus one other 'issue' with all full bridge drivers is the lower input max voltage of 15v. So 15v is as hard as you are allowed to switch the fets. But it should be alright.

[Nali2001]

Nice Iron rod lol
But at 2.1 max Tesla is it really that much better than regular steel/silicon steel?

Nice price as well!

[gyulasun]

Hi Ron and Steven,

Does not the iron rods give eddy current losses?  Once they are solid (I understand they solid and not ribbon or stripe) and not laminated and changing flux travels through them? 

Ron, at Digikey here is full bridge MOSFET driver choices:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=2556427  and click on H bridge in the Configuration column and then In Stock as filters and then click on Apply Filters.
You will get a list, including the Allegro types too.

Steven, Sciento has had issues with oscillations in the output driving pulses going to the gates of the MOSFETs and the series small Ohm resistors and some low ESR decoupling capacitors may have a role in killing those unwanted ringings that may burn the driver chips.  I have not used such full wave drivers so cannot advise too much. Printed circuit layout is sometimes critical for sure.

Gyula

[Nali2001]

Does not the iron rods give eddy current losses?  Once they are solid (I understand they solid and not ribbon or stripe) and not laminated and changing flux travels through them? 

Big time yes, will get hot pretty quick. But is allows for easy prototyping.

Steven, Sciento has had issues with oscillations in the output driving pulses going to the gates of the MOSFETs and the series small Ohm resistors and some low ESR decoupling capacitors may have a role in killing those unwanted ringings that may burn the driver chips.  I have not used such full wave drivers so cannot advise too much. Printed circuit layout is sometimes critical for sure.

Thanks, yes they are known to be sensitive. I always use series gate resistors and various decouple caps. I only got it more or less right with tvs diodes in the bridge.

[i_ron]

I used this one:
http://servilo.website.pl/laboratorio/esploroj/rownolegle_strumienie/SRSM2i3_sterowanie_rys1.png
to switch the coils on PPMM
and it did not perform as good as this one:
http://servilo.website.pl/laboratorio/esploroj/rownolegle_strumienie/SRSM2i3_sterowanie_rys12.png
The second circuit gave higher overall efficiency.

scianto,

This is an open forum where we would love to hear about your motor and latest experiments also. Feel free to bring us uptodate.

The same message to yssuraxu and kekko, jump in, whats happening?

rgds, Ron