Magnetic amplification and neutralization motor by Art Porter

[synchro1]

Here is one way to test this. Two identical coils on a soft iron core with
a magnet on. The core to the left is the output coil.

G.

Look's like this would make a great MEG just the way it is pulsed around 200Hz.

[LarryC]

Testing has shown what Art states in his pull test are true, but it does not seem to have any advantage over a DC Permanent magnet motor (shown below). Let's consider it a 1/4 HP motor. 

Comparable electromagnet only pull test:
Replace the magnets with metal arcs. The motor would still run, but the torque would be very low and could easily be stopped by hand.

Comparable magnets only pull test:
With the magnets in place and no power applied, the rotor would be hard to turn by hand.

Comparable magnet and electromagnet pull test (amplification):
With the magnets in place and power applied, the rotor would be impossible to stop by hand.

The nullification test does not apply because the rotor is almost all the way around and has tapered edges on the poles to reduce the magnetic lock-up effect.

The flux is being realigned or switched in both cases, but the DC PM motor has an advantage of a North to South pull connection thru the rotor.

So I will not attempt a replication. I'm normally trying to prove OU, but in this case it does not seem possible.

Regards, Larry

[ramset]

Larry,
Thank you for taking the time to investigate this and share your opinion.
Sure seemed like a good idea!

Chet

[LarryC]

Larry,
Thank you for taking the time to investigate this and share your opinion.
Sure seemed like a good idea!

Chet

You're wellcome Chet. My fun is in the analysis and the building.

I've included another scope shot for those who still wish to build. The blue trace is showing the magnetic flux at the face of the core in amplification mode using a pulse gen. It is much greater than the Em only mode, but I still believe it is a common DC PM motor characteristic where torque varies with magnet strength.

This test used 18V at .5A at 84.75 Hz using transformer core. A solid iron core would be slower at switching and may explain the unusual design of Art's motor. Large diameter to allow time for switching and to reduce heating losses. With transformer cores the motor would only need two outside magnetic poles and multiple (4,6,8) metal arc's on the rotor to produce the same results.

Regards, Larry 

[Xaverius]

You can go to a metal supply in the UK and get iron stock and have it annealed ( in an oven ) to a "dead soft" condition and it will work as well.
Dont annealed it then machine it - machine it then anneal it!

@ Darkspeed, does Ed Fagan supply small orders of VimVar, as in 1" x 1" x 12"?  Also where can you get small parts annealed?  Thanx.