JB Zero Force Motor - anyone building?

[MileHigh]

I also note that if you fire the drive coils with only one of the two possible pulses per magnet pass, and you only energize the drive coils in one direction (keep it simple), then that would work out just fine with a "dumb" timing circuit.  For example, if you used the "dumb" Bediini SSG pick-up coil with the alternating magnet polarities on the rotor, you would fire say a "push" (after TDC) when the north-facing rotor magnet passes, and then a "pull" (before TDC) when the south-facing rotor magnet passes.  There is nothing special to do, it would all be automatic.  So this would give you four power pulses to the drive coil per rotor revolution, alternating a single pulse of push (after TDC), then a single pulse of pull (before TDC) for each individual magnet as it passes each end of a drive coil, with very very simple timing circuitry.  In other words, each individual magnet would see push, then pull, then push, then pull as it does a full 360 degree rotation.  Since you have four sources of driving torque on the rotor (the two drive coils) and four magnets on the rotor, it would "look like" sixteen "pulses per revolution" - with simple timing circuitry.  This would also work perfectly with the MHOP timing circuit and using the button timing magnets.

As far as the fancy double pulse per magnet pass goes, alternating the direction you actually energize the coils to give you a pull then a push, don't I always see people posting a "H bridge" circuit with an arrangement of MSOFETs that will energize a coil in one direction or the other direction based on a control signal input?  So that means the circuit to fire the drive coils in either direction is already done, and the main challenge is in implementing the timing control circuit.  However, as stated above, even a basic timing control circuit gives you the equivalent of sixteen drive pulses per revolution.

If you use the H-Bridge then you have to have a way to safely get rid of the stored energy in the collapsing magnetic fields.  I am not going to look up the circuit so I don't know how difficult or easy that is.

The creme de la creme is this:  You precisely adjust the drive voltage for the coils and the pulse timing so that a maximum of the energy supplied goes into applying drive torque to the motor, and a minimum of energy remains in the collapsing magnetic fields of the two drive coils for a given RPM.  There is nothing special about the energy in the collapsing magnetic fields and it is actually best considered mostly waste or lost battery energy.  Nor is it "radiant energy."  You go look up any electronics book and find the discussion about a coil discharging it's stored magnetic energy because current is flowing through it, and you will not find a single reference to it as being "radiant energy."  "Radiant energy" with respect to a coil discharge is just a meaningless buzz word in the realm of the forums and free energy.

Again, the most interesting challenge is to maximize the supplied battery power that actually makes the rotor spin, and to minimize the "waste" energy that you have in the collapsing magnetic field.  That a challenge that is almost never considered by a pulse motor builder, but it is very real.

Here is the reason why it is real:  The source battery energy that eventually goes to the charging battery via the collapsing magnetic field - that energy transfer is very inefficient - perhaps you will lose 40% of the source battery energy in the process of transferring.  So what's the point?  Logic says you may as well keep the energy in the source battery in the first place.  You lose too much when you go to recharge the target charging battery.  That's reality for you.

[tinman]

Here is my first go at the zero force motor.

https://www.youtube.com/watch?v=pOdAneOt7lk

[minoly]

Here is my first go at the zero force motor.

https://www.youtube.com/watch?v=pOdAneOt7lk

Hey there Tinman, looks like you got the timing correct at the end of your video. Nice work!
Once I got the bipolar switch on there my power consumption was reduced even further. Alas, this is still as in many of my builds only very efficient. My toroidal design was for sure less efficient than my spool design, I got the spools down to the micro Amps.
Anyway all fun - cheers - Patrick


I mentioned earlier to everyone in an earlier post here to listen to JB and to slow his vid down to frame by frame...

[Lidmotor]

That is great Patrick but here is John's diagram that I went by on my build.  I must have misunderstood something.  In this diagram he shows the motor being fired when the rotor magnets are in the middle of the coils.  Perhaps he just drew the timing wheel wrong.  I tried moving the reed switch to the corner like TinMan did and my motor ran better.  Configured like this the motor becomes more traditional with all four of the coil ends push/pulling on the rotor when the reed triggers.  The question then arises--why did he call it a 'zero force motor'.

[tinman]

That is great Patrick but here is John's diagram that I went by on my build.  I must have misunderstood something.  In this diagram he shows the motor being fired when the rotor magnets are in the middle of the coils.  Perhaps he just drew the timing wheel wrong.  I tried moving the reed switch to the corner like TinMan did and my motor ran better.  Configured like this the motor becomes more traditional with all four of the coil ends push/pulling on the rotor when the reed triggers.  The question then arises--why did he call it a 'zero force motor'.

That is correct Lidmotor,John dose indeed say and show that the coil should be energized when the magnet is in the middle of the coil--this is where the term zero force came from,as he thinks there is zero magnetic field at the center of the coil. The fact is,the field(both magnetic and electric) is strongest at the center of the coil.

Anyway,im with you on this one-->enough time spent on it.
Time to move on to a different project (pulse motor of course lol).