Debates on how to make a more efficent motor using Flyback (MODERATED)

[hoptoad]

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In the real world you would be very hard pressed to find a pulse motor running in a practical application.  I can't think of one offhand.
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Ummm, computer hard-drive, every brushless step motor ever used, ummm, basically everywhere, CNC machining .....

Cheers

[MileHigh]

Ummm, computer hard-drive, every brushless step motor ever used, ummm, basically everywhere, CNC machining .....

Not quite, I am referring to a conventional pulse motor architecture.  Step motors might have a bit in common with a pulse motor, and hard drive motors are are based on a "Y" drive coil configuration and sophisticated electronics to control a pair of MOSFETS for each channel to emulate a sine wave excitation.  That is far away from a conventional pulse motor.

Sorry the spaces were lost when pulling text from the pdf.

L7250utilizesST'sproprietarySmoothdrivecommutationalgorithm.Smoothdriveisavoltagemodepseudo-
sinusoidalspindledriveschemewherethedutycyclesofthethreewindingsaremodulatedtoformsinusoidal
voltagesacrosseachwinding.Thesystemdeterminestheshapeandamplitudeofthedrivingvoltagesina
completelydigitalmanner.

ThebasicSmoothdrivewaveshapeisstoredindigitalmemory.Avoltageprofiledesignedtoreduceswitching
lossesandincreasethevoltageheadroomhasbeenimplemented.Essentially,twophasesarePWM'ed,while
thelowsidedriverofthethirdphaseisonat100%dutycycle.ThePWMdutycyclesaremodulatedinsucha
wayastoresultinsinusoidalcurrentsonall3motorphases.Drivinginthismanner,asopposedtodrivingtrue
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ThesystemisphaselockedtothemotorbysensingoneBEMFzerocrossingononewinding,onceperelectrical

Nonetheless, Luc's exploration into finding how to make a pulse motor run more efficiently is a very worthwhile exercise.  The follow-up suggestion would be to define the efficiency mode and then make measurements with and without the use of the spike.  Yes, seeing the rotor spin faster is confirmation of the positive effect but coming up with a measurement system would also be interesting.

[synchro1]

The "Keppe" fan motor is the most obvious outstanding example of a successful commercial pulse motor.

Woopy's high voltage back spike momentarily lowers the resistance in the inductor and causes power to flow backwards from the capacitor to the output coil producing a correctly timed propulsion pulse. The power's generated by the spinning magnet rotor.

I think Woopy can increase the efficiency of his U shaped ferrite core coil by placing small disk magnets over and under the ferrite core on each end near the bends with the polarities correctly positioned. This should raise the saturation level, beneficially alter the core's BH curve and may impart the "Synchro Coil" advantage to the set up!

It might be possible to add multiple U shaped output propulsion coils to the motor and trigger them all with the same back spike simply by adding more wires. A separate diametric tube magnet could then be placed on top of the rotor, perhaps with a three phase output coil cage around it like the Daftman's. The output from the second magnet alternator would serve as an even better measuring system then MileHigh's overly complex "copy and paste to look smart" Rube Golberg contraption cluttering the thread above.

[synchro1]

Igor's "Reed Switch Spinner II" reverse biased LED fly back to source:

https://www.youtube.com/watch?v=vWvI7T7h3tk

Igor runs his sphere for hours with no drop in source voltage.

[MileHigh]

Minoly:

I'm not one of those fly-by-night commenters who thinks they know everything. I have experimented with this for some time and have many videos.

I am not "fly by night," I have been around for about six years.  If you have some character you will take back your comment.  Nor do I think I know everything, but simple pulse motors are quite easy to analyze.  You are playing Straw Man and that's a bad thing to do.

About two or three years ago I made an honest technical comment on one of your clips.  You immediately deleted it and banned me from your channel.  That shows where your head space was at but I get the sense that you are starting to open up your mind to the real world of electronics.

My advice to you is to learn about how an inductor discharges into a resistive load for starters.  There are hundreds or thousands of credible sources for that.

You want to really learn about electricity and magnetism with a good YouTube teacher?   Look at this guys clips, he is amazing:  https://www.youtube.com/user/lasseviren1/videos

The guy is the real thing and he speaks the truth.

It's foolish on your part to try to impugn my character when I am being honest and trying to help.  I battled with John Rohner and Wayne Travis and they are now both under criminal investigation by the FBI for fraud.  Between the two of them they stole about three million dollars from unwitting and gullible investors.  I guess that makes me a good guy.  A forum is all about exchanging ideas and sometimes other people's ideas will be different than your own, go figure.

MileHigh