Hilden-Brand Magnet Motor

[MeggerMan]

Hi Marcel,
Yes I have done that test too but I think that is not a fair test.
If you have an output coil with same current supplied, of course it will stop the flux flowing though it.
What I think you need to do is work out the induced voltage in the output coil, then add a specific load resistance onto it, and then work out the current that will hopefully be less than the input current.

Formula for induced voltage (I think):
Vind=N*Bm*Sa/dt

N= number of turns
Bm=change of flux densisty in Teslas
Sa=cross sectional area in meters sq.
dt=time interval in seconds

I am currently working on a motor design in Femm at the moment.
I think I have a idea of how JackH did his first 2 valve motor.
The reason for the rotor being so close the stator is that any air gap will require an increase in current, in the
input coil, to get the valve to switch. On a normal motor you can get away with a pretty large gap and it makes little difference to the torque output.

I am looking at doing a lua script for a motor to cover one rotation of the rotor and to output the torque (n/M) for each position as well as the input current required.
It should be possible to work out the mechanical output power Vs electrical input power.

Regards

Rob

[MT]

Thanks a lot for answer. I see serious gaps in mine understanding of electromagnetism. Still need to digest it but it looks there should be induced higher voltage as there is more change in flux. Less current can be assured with more ohms in load.
Anyway I'm planning to build two transformers both the same dimensions and number of turns. Only difference will be magnet inside middle leg.

Just thinking maybe it can be possible to use fully rectified 50Hz AC as input at right voltage. I mean rectified but not filtered with a condensator to get pulsing voltage at input. And hope trafo with magnet will magnify it. But there could be problems with remanent magnetism as magnetism dont get reversed and this could result in decreased difference in flux.

Also considering idea to not cover magnets in the middle leg. Just use as many silicon plates as is the depth of magnet. Jacket would be then only from left and right but not at front and back of magnets. Dont know what the effect would be but such trafo would I think copy simulated behaviour in 2D FEMM.

with kind regards,
Marcel

[MeggerMan]

Hi JackH,

OK, I have tried to simulate a motor but I cannot see how to get the flux path to flow through the rotor without breaking the two valves into two seperate segments.
The end result is a what looks like a figure "8".



Attached is the femm file for the above with the results file as well (.ans).
Jack, can you throw me a bone here, I'm really struggling with how your two valve motor looks like.
The rotor/stator gap seems to be so critical to the valve working and hence torque, that the rotor needs to rub surfaces with the stator.

Also the femm software seems to give some very odd results (torque via weighted stress tensor) for the curved surfaces of the rotor and stator. If you specify different values for the arcs "Max. Seg Degrees" then the torque can jump from 5 n/M to 0.5n/M with just a change from 5 degress to 2 degrees.
The 2 degrees gives a smoother curve and takes a lot longer to process.


Regards

Rob

[dingbat]

i cant get my mind off that strange disturbance in the graph.  the "PM on" line - the way it flattens out near the peak of the "Bn Diff" line.

it seems like the kind of anomaly that would be required for peculiar behavior.  it is funny how the line becomes very close to the line without the magnet once it gets past the peak of the bn diff line.  clearly there is a rapidly diminishing return when you energise past the peak point.

what does this disturbance mean?  it is very strange to see when all other curves are smooth - to see such an quirky disturbance in that curve.

[MeggerMan]

Hi JackH,
Thank you for the feedback, I may need to wait until your patent comes out before I can look at simulating it and eventually building it.

At the moment I am looking at the solid state MEG/toroid idea again, some recent findings seem to have sprung up. Its all getting a bit interesting.

I'm a bit baffled by the idea that a wind farm would use one of your motors in a wind turbine narcel.
Surely if the motor runs at over-unity can they not scrap the wind turbine all together and just run it as a motor-generator setup.
Can I ask what company is doing this?

Regards

Rob