Magnetic amplification and neutralization motor by Art Porter

[LarryC]

@Chet,
Thanks, I understand.

@darkspeed,
Thanks for the information.

@All,

The amplification is only necessary when the metal arc is being attracted to the core. Once the beginning edge of the metal arc reaches the core the amplification can be turned off as the core slides along the metal arc. You can see how easy it slides in the videos. Then the neutralization is turned on as it gets near the end of the metal arc to slide pass. Thus the duty cycle need not be high. It really depends on how many sets of cores are used.

Now, this would require a lot of energy to overcome the massive Cemf, unless you use my secondary trick. Then you only have to have enough time for the core alignment.

IMG_0260 shows the core I used for the following scope shots. It is wound with two strands of wires. So I can power one and leave the second one open or shorted.

IMG_0263 shows the traces with the secondary open. Note the slope of the bottom trace(current), even with a 50% duty cycle the current does not reach the max.

IMG_0261 shows the traces with secondary shorted to create a max load effect. Note the current trace shoots up instantly because the shorted secondary removes the Cemf from the primary.

The secondary does not waste power, since a pulse is being sent and not a sine wave. Not shown, but the secondary traces are flat except for the spikes at the beginning and end. The secondary could be opened at the end of amplification to capture the massive back emf, since it should not effect the slide along the metal arc.

Regards, Larry

[darkspeed]

Thats a good idea Larry! Thats how all bifilar relays (solenoid) work, they short the second coil to kill the pulse.

[LarryC]

@darkspeed,

Do you know the reason that Art would use a magnet diameter that is almost twice that of the core?

Also, do you know of any good reason to use low carbon steel for the core with all of it's problems, instead of more appropriate magnetic material. Art owns this place    http://www.tru-fitalignmentsolutions.com/tri-tube/index.html. So he would have a lot of steel pieces available.

Regards, Larry

[MasterPlaster]

@LarryC, I think  the idea is to have a soloniod / magnet/coil/core combination where the magnetic field can be in effect nullified conveniontly.

There are many fancy magnetic materials but for a cheap motor you would want cheap maagnets.

http://www.irm.umn.edu/hg2m/hg2m.pdf

[darkspeed]

@darkspeed,

Do you know the reason that Art would use a magnet diameter that is almost twice that of the core?

Also, do you know of any good reason to use low carbon steel for the core with all of it's problems, instead of more appropriate magnetic material. Art owns this place    http://www.tru-fitalignmentsolutions.com/tri-tube/index.html. So he would have a lot of steel pieces available.

Regards, Larry

The smaller diameter core allows for flux focus from the PM and too much core material becomes a problem when you try to shunt the flux in it.

Soft Iron has good permeability, acceptable hysteresis , and its easy to machine into shapes like that from bar or TUBE sections.
When i prototype something - out comes the soft iron stock - to play with. It works very well, but if you pulse it to fast it will get very hot. Actually the only thing better would be a metglass magamp bar but those are hard to come by.

He may be playing games with your brain.. what looks like a bar is not always a bar.. you cant see what is under the core.. it could be a tube with end caps OR IT COULD HAVE A FLUX GAP hidden under there