Pulse motor and timing

[joe]

Hi! I am new on this site and i would like some info about how to hook more than one coil on my bedini SG. Have been worked on this project for more than a year now and i would to move ahead on to add more coils on my set up.

Do i need transistors on each coils and how do i calibrate ( let say) 3 or 4 coil so they can run (in harmony) I mean how do i get the right timing?

If anyone can help!  Thanks

Joe

Sorry if i make mistake on my writing. My english vocabulary is kind of "poor"! I am a  french canadian speaking.

[Thaelin]

   Well, I am basicly doing the same thing. I will have 4 magnets on each end of a teflon cyclendar
with 3 stationary coils. Due to the proxcimity of the magnets, the reed relays tend to be excited
at the wrong times. I am using a band of 4 small magnets around the center and then place the
reeds at the prescribed place to make them fire the 3055 transistors for "each" coil. I have found
that trying to put more than one on a transistor tends to heat it  and I would prefer to generate as
little heat as possible.
   I have a bench top model now that achevies about 1000 rpm and is able to run a small generator
I have no on board generator yet but that is still to come.  I have been using about 200 ft of#30 wire
wrap wire around vandium cores and it seems to make a great pulser. These windings are shorted
together on each end to achieve a 10.4 ohm load which draws aprox 300 ma at running speed. On
startup, the pulse length is longer so the transistor is on longer and shows about 750 ma and then
gradually drops off as rmp comes up.
   It is my final intention to have the magnet sets offset by 45 degrees as to be pulsing the rotor 24
times per revolution. This should make for over enough charge pulses to keep the second battery
prime.

   I would imagine you will be using hall effect for picups but the same principal should work for you.

That is about all I can share at this time. Hope it helps out.

Sugra

[rlm555339]

Joe,

If you have a different number of coils than you have magnets, you need to establish what exactly your firing order is.  It would be a good idea to make two paper wheels.  Put dots on the one paper wheel which represent the magnets and what would be their precise location.  On the other paper wheel, cut holes where your coils will come.  Then place the two paper wheels together with a pin in the middle for your axle, and slowly turn the one which represents your rotor.  Depending on how many coils you have relative to the number of magnets, you will notice that the order of firing is not necessarily consecutive. 

For instance, I have a rotor with 10 magnets and nine stator coils.  When the rotor turns, it is "every other coil" that comes into alignment with magnet; not every consecutive coil.  This will have a direct effect on your firing sequence.  The paper wheels are a simple way to determine what your sequential firing order will be.

[joe]

Sugra,

When you say you are using "reed relay" are you talking about the "reed swicth"? Because i have tried it but the voltage rate is low on that device. I think the higher voltage it can take is about 4 to 5 volts. Am i wrong? Or do you have to put a resistor in serie to it so it won't blow up? Cause on my machine i am using 12 volt you see.

Joe

[joe]

Ronald,


Thanks for the info about the "paper wheel". I sure will experiment it on my new design machine.

Joe