Magnetic Permeability ... I can't find anyone talking about this !!!!!

[Charlie_V]

I ask anyone with knowledge of Electromagnetic Cavity Resonators to post their understanding of it !

It is the exact same thing that happens to sound in a guitar or organ or any other acoustic resonator.  A wave goes in and is bounced back and forth (taking a while to decay).  Before it decays another wave enters, and another and another.  All the waves entering add to each other before they decay.  Thus, you have an amplification of the initial source which is at the same frequency but much lower in magnitude.  Electromagnetic resonators are the same.

That vortex thing with the magnets is neat, but has anyone verified it? 

[Charlie_V]

Alright I looked at that Howard Johnson book while at lunch.  After looking at it I knew who he was, I've read about him before.  Firstly let me add that people have built his motors completely following the patents he made and none of them work.  Secondly, the magnetic field lines are not the way he draws them, conventional science is correct, Howard is wrong. 

Howard makes elegant drawings/measurements but anyone who has worked with a hall detector before will know that the measurements of the field are only valid if the sensor is placed 90 degrees to the field.  Measurements taken at different angles are not accurate.  It will give you strange readings if you do not measure it correctly.  Unlike the iron fillings, the hall detector works on current change.  We all know that current is effected at a 90 degree angle when placed in a magnetic field.  A moving charge WILL form a vortex in a magnetic field.  He is plotting what the current in the hall sensor is doing, which indeed would be a vortex shape.  This is not the magnetic field lines, these are the vortices that the moving charge in the sensor is making! 

But this was not the final blow in my eyes.  The problem I had is that if you use his vortice model, then a halbach array could not work.  The way he has drawn the fields swirling at 4 points do not add up correctly if you place a series of magnets in a halbach arrangement.  However, the conventional model of the permanent magnet field does yield the proper effect in a halbach arrangement.

I feel Howard Johnson's concept is very erroneous and I would warn against it. 

[The Observer]

Hey Charlie,

My Dad was very skeptical of Howard Johnson's work..
   of course he is skeptical of anything new.

Personally, I don't like to discount things as easily as that.
  There must be something valid Howard is measuring.
    I doubt he didn't know  how a Hall Effect sensor works.
      The man dedicated his entire life to magnets... and if he has patents, that means they were scrutinized beyond belief,
      before the patent office put it's stamp of approval on it.

I would like to see if anyone else has done this sort of test.

Gotta get going, sorry for the short post.

                                                          The Observer

[Charlie_V]

I don't know Howard so I don't know what he knew or didn't know.  But from what people have tried, his setups do not work.  Now maybe he didn't give the full story so that what you try from his published works are futile - many inventors do that. 

As for what he put in his book, like I said it does not describe the Halbach array where as the conventional science does.  If his model cannot describe something that is well known, then the model is not correct.  Thats all I'm saying.  I feel the measurements he made with his hall sensor are really mapping the vortex the charges inside the sensor, not the magnetic field.  I'm sure there is some interesting things that could come out of his work - perhaps even a more improved magnetic sensor. 


By the way, my tests have been inconclusive as far as my setup goes.  My coils are too small.  I've determined I need to produce about 100-150mV to see a large enough effect in the current of the motor when the coils are shorted- otherwise the signal is lost in noise.  Right now they are producing 50mV.  I'm trying to wind the coils a little larger so maybe I can get it to 100mV.  I'm also building a slightly larger, simplified version of the same experiment.  I'm hoping it will produce more voltage and allow me to determine the nature of my setup.  More than likely it will respond like a conventional generator, but maybe not. 

[The Observer]

Hey Charlie,

Because conventional measurements with the Hall Effect sensor only measure 1 component of the magnetic field at a particular point in space,
    I really don't think this is a very complete measurement.
       That is, it is my understanding that only the maximum reading at any point has been acknowledged and interpreted.

One would think a comprehensive 3D reading at every point would give one a better idea of what is going on
  Perhaps both models can be useful in understanding the characteristics of a Magnetic Field.

I was wondering, are you using a core with your coils?

                                                                              The Observer