Gray Tube Replication

[Spokane1]

Mark,

How many wires are coming off the coils in the motors?

Dear Aaron,

We don't know.

The electromagnets were completly stripped out by Nelson Schlaft in 1980 and rewound with #14 AWG magnet wire by a machine shop next door to where E.V.Gray was set up at in Canyon Country, CA.

Mr. Schlaft maintains that the original magnet wire was of a smaller gauge, maybe #22 AWG or so. The photo of the EMA4-E2 stator shows a wire diameter of around that gauge. So, any detail features of the construction of the original motor electromagnet design has been lost from that source, darn.

Mr. Schlaft also said that the original potting material was a light brown "gunky" material. Perhaps rosin and beeswax like what Dr. Tesla used?

Mark McKay

[Aaron]

coil windings

Hi Mark,

So the EMA4-E2 originally had the possible 3 wire setup? Would you refer to this as Marvin Cole's design?

Basically, would this be the question?

How did Marvin Cole wind the original coils n the EMA4-E2?

If we knew that, would that be the most probable answer to the coil popping demo?

[Aaron]

motor specs

Schema I was using for my test

What are the component specs?

Caps?
Diodes?
Coils?
Both transistors?
Is the rotor running in attraction or repulsion mode?

[nat1971a]

and the polarity of the caps

[Spokane1]

Coil Windings

Hi Mark,

So the EMA4-E2 originally had the possible 3 wire setup? Would you refer to this as Marvin Cole's design?

Basically, would this be the question?

How did Marvin Cole wind the original coils n the EMA4-E2?

If we knew that, would that be the most probable answer to the coil popping demo?

Dear Aaron,

The electromagnet that Richard Hackenburger is popping appears to be the same shape and size as the units used in the EMA4-E2. I have no doubt that this was a Marvin Cole design. Now the electromagnets that are in the earlier EMA4 and EMA5 (circa 1964) appear to be about 50% larger.

While we are discussing this subject consider the construction features of the EMA4 and EMA5 electromagnets. Have you ever wondered why Mr Cole would spend the extra money to provide the nice round custom machined end pieces to fit against the laminations? You certainly don't see this in commercial motors, not even in HV designs (at least up to 2400V). In normal applications the coils are formed close to the poles.

Also look at the cross section of the magnetic material the central core. It is much larger than then thin top and botom flanges. These flanges are very wide for a salient pole design. Check out the attached photo. This is the "Start Motor" which is a commercial design 4 pole DC dyno-motor. Here the stator compound coil slops beyond the pole face for quite a ways there is no need to extend the core over the coil.

When you do a Finite Element Magnetic Modeling Analysis (FEMM) of this configuration you find that the relatative magnetic mass of the top and bottom flanges of these laminations are to thin to support much magnetic flux. However they do distort and spread out the flux generated from the coil. This is not to the advantage of a common magnetic motor since you want the flux density to be as strong as possible across the air gap. But this is not a classical motor.

What are these wierd modification for that had to be custom built for $$$ ??

I maintain that thesee unique features are in support of the arc stretching process. To me it appears that Marvin Cole started with single electromagnets (1964) then advanced to the spit coil approach (1970).

How did Marvin Cole endup winding the electromagnets in the EMA4-E2?

We really don't know. With at least three wires per electromagnet, a conductive core, two coil assemblies, and two switches per rotor wipe the number of possibilities becomes quite large.

IF we had an orginal coil assembly we could probably figure out the concept of the power supply a little quicker, but as it is we have neither.

Mark McKay

[Aaron]

single coil

Thanks Mark,

Do you have a proposed wiring diagram for a single coil with permanent magnet? There is some info to suggest that there was a permanent magnet model, such as what Bedini saw.

If that is the case, then there couldn't be an arc between two cores, but there could be one between one core and the permanent magnet material.

[Aaron]

water sparkplug circuit

Is there anyone here with a water sparkplug circuit already setup with a booster cap scenario that wants one simple mod to experiment with the green spark burst?

[Spokane1]

Stretched Arc in PM EMA6 design?

Thanks Mark,

Do you have a proposed wiring diagram for a single coil with permanent magnet? There is some info to suggest that there was a permanent magnet model, such as what Bedini saw.

If that is the case, then there couldn't be an arc between two cores, but there could be one between one core and the permanent magnet material.

Good Idea,

Let me work on that concept for a while.

Mark McKay

[Spokane1]

mylurye Motor Driver Circuit

Dear mlurye,

Here is a quick drawing of your Motor Driver circuit to mark-up and make corrections on.

I really like the method of driving the ignition coil.

Mark McKay

[mlurye]

Spokane1: Thank you for trying.
I updated my schema in original post.
Also here is new movie YouTube - Motor Based on Grays Patents

[Guest]

@Mlurye, impressive to say the least!

Any efficiency estimation?

[mlurye]

Gauss, this system is just a proof of concept. And truly I don't know how I would even try to check this system efficiency.
But I already noticing that it can generate good tork if properly tuned up.

[gmeat]

Hi Guys,


I came across this interesting video of Doug Konzen while watching Mlurye's video.Just thought some of you might be interested in viewing it,As I have not seen this video until now.You guys are doing great work in this thread .

YouTube - The Konehead Pulse Motor by Doug Konzen


-Gary

[Electrotek]

@mlurye

Very nice motor! Check out Patent #4949002.

If you have a laser printer, you can print out this type of motor. Glue some aluminum foil on a piece of paper, then print the pattern. Transfer it to a pcb with an iron, then etch.

[gmeat]

[quote=Electrotek;44449]Very nice motor! Check out Patent #4949002.

If you have a laser printer, you can print out this type of motor. Glue some aluminum foil on a piece of paper, then print the pattern. Transfer it to a pcb with an iron, then etch.[/quote


Hi Electrotek,


Thanks for posting that patent,At 1st glance it reminds me of what Bill Muller was doing in his later years of research .


-Gary