Phases

[edy252]

hi....

what happens if i make the number of phases of the pmg as the number of coils? (i.e. rectifying each coils alone (after either in star or delta connections).....for example, if i have a 6-coil pmg and make it 6-phase ?

[drdongle]

If your going to rectify each coil independently then you can't use either star or delta wiring.

Carpe Vigor

Dr.D

[finnsawyer]

Check out the circuit diagram that I left on the following posting:

 Voltage doubler using 3 phase from AirX

Its expandable to any number of inputs.  The caveat is the voltage drop across each diode.  For silicon diodes it's around .7 volts.  On the other hand each capacitor charges to near peak voltage minus the diode voltage. For instance, for 14 volts dc out from six inputs you would need a peak voltage per coil somewhat in excess of 3 volts ((14/6) + .7).  Germanium diodes drop only .3 volts, so they might give a better result.  Bottom line?  Experiment with one coil to see if the circuit would give you the result you want.  

[devoncloud]

you can make as many phases as you have coils, but considering the loss from the amount of diodes (bridge rectifiers)that you will put into the design, I would say it is not the best idea.  Two coils per rectifier I would say should be your minimum, but I guess it all matters on what you are trying to accomplish.  IF you are not too worried about maximizing your power output, why not?

[windrules]

One advantage is that you could stack your rectifiers for both parrallel and series to achieve the voltage/amps you need simply by plugging and unplugging wires. Could be easier than calculating exactly what coil windings you need.

Regards,

Mos

[finnsawyer]

Carrying this a little further, if your six coil arrangement is really three phase (three pairs of coils each pair in phase), you would be better off bringing out the three phases as shown in the diagram.  Only one diode is needed per pair or phase.  For the example I gave the output voltage then could be 16 volts.  With a full wave rectifier for each phase the output would again be 14 volts (the current must flow through two diodes).

[finnsawyer]

here's the circuit:

[tecker]

   If you've got enough out of each coil then you can bridge to a cap and parallel  

to a comman out or add those in phase to get the voltage you need bridge to a cap and

output . Amperage is cut but you can keep the speed up limiting the current to get a look at the power curve at different speeds.