Circuit setups for pulse motors

[hoptoad]

@ Ren -

P.S    Re your next rotor build:

Because you will be using 16 magnets, but dual pole, not mono pole, you will only double the pulse frequency harmoniously by having two separate trigger coils and transistor switches, each to take advantage of pulsing the separate drive coil filaments with the correct polarity for the magnet pole it is facing at the time of pulsing.

Cheers and KneeDeep 

[hoptoad]

To all;

I've been having mixed results (failures) for a long time now. Trying various configurations that approach unity but don't quite get there...
Latest thought is to now wind my Adams style coils on thin grade HOLLOW steel core of hopefully 1/2" diameter. Someone told me this configuration exibits much more power than any other core.
Just wanted to pass this one on in the hope it will help one of us to get-er-done!
Good luck all,

Carl

Hey Carl - I have little bit of information regarding hollow cores. I posted it on my site some time ago. I used hollow cores in a number of experiments and was very pleased with the outcomes. You may (or not LOL) benefit from the info I posted.

Go to this link first:  http://www.totallyamped.net/adams/
Then click on page 4.   I hope this info is useful to you.

Cheers from the Toad Who Hops 

[Ren]

Thanks Hoptoad. I will have to search around for the right meter. I am looking forward to the completion of this one. I noted that in effect it would only pulse on every second pole if setup in SSG circuit. Have you ever tried wrapping a coil bifilar and have a separate pickup for each winding, one to fire on the north and one to fire on the south?

Thanks for the notes on how the coils impedance will change during pulsing. If I understand it correctly as the frequency of the pulsing rises the resistance of the wire changes. I guess this would explain how there are so many variations in results when considering everyone has such different geometry.

[hoptoad]

Have you ever tried wrapping a coil bifilar and have a separate pickup for each winding, one to fire on the north and one to fire on the south?

If I understand it correctly as the frequency of the pulsing rises the resistance of the wire changes.

@ Ren
In answer to your question, the answer is YES, and it is very effective. If you are using transistors to do your switching, then a diode from ground (emitter) to the collector on each transistor will allow the Collapsing EMF from each coil to feed directly back into the supply. Each coil will be mutually co-operative in applying power and regenerating the power source. If you wish to off-load the CEMF, then forget the Diodes and make use of the third coil in your tri-filar arrangement to off-load via a full wave bridge. You will get true AC from the third coil as the pulses in each drive coil should be opposite in polarity.

You can also try a different method of off-loading in which you connect a full wave bridge between the collectors of the two transistors. Your drive coils should be on the collector side of the transistor not the emitter side, if you choose this option.  Again, the efficacy of off-loading this way will be dependent on the duty cycle of each pulse. Keep your duty cycles low, preferably around or below the 20-25 % mark. Your motor should still run harmoniously without causing torque loss when off-loading the CEMF to an external battery, if the applied pulse/s duration/s are kept short.

If you are using Mosfets, there is every likelihood that they will have a sink to source diode built into them. This will mean that off-loading the CEMF to another battery will be less effective because the circuit will be automatically trying to offload the CEMF directly back to the power source via the inbuilt diodes.

As the frequency of the pulsing rises the DC resistance remains constant, but the inductive reactance increases. This means the  Total Ohms (impedance) of the coil when the motor is running will be a vector addition of the constant DC ohms (resistance) and the inductive reactance (impedance). The best thing about inductive reactance is that while it impedes current in direct relationship with frequency, it does not cause power loss due to heating. That is, there is no associated I^2*R losses with impedance, like there is with resistance.

Cheers from the Toad Who Hops 

[Artic_Knight]

i understand the principal of pulsing, its a known fact that even factory made electric motors suffer no noticable loss in performance if the electrical input is regulated in equal pulses of off and on. however i do not understand the back emf. i know what it is however how is it collected? is that what the outer coil is used for? and can the firing coil be set up with a diod to collect back emf?  does collecting the back emf for use have an impact on the motors performance verses not using the back emf?