Hilden-Brand Magnet Motor

[MT]

Thanks, yes units should be Teslas not mTeslas. I modified previous post.

all the best,
MT

[MeggerMan]

Hi,
Although I have managed to get an excess flux value of 128% it must be remembered that cross sectional area of the outer leg compared to the inner leg is much smaller, so to be fair I would really need to compare apples with apples and make the inner leg the same width.

Also I want to keep to a certain plate width. I know I can get hold of silicon steel in 50mm wide strips.
But getting narrower strips will require cutting.
I have my linear hall sensors now and hopefully I can measure up to about 1.1T if I set the device in unipolar mode. AD22151
http://www.analog.com/UploadedFiles/Data_Sheets/5074535122786366627AD22151_a.pdf
Also I need to decide on a square core (easier to build) or round core shape(more efficient).


Regards

Rob

[gyulasun]

Hi All,

Gyula, I have included your air core results in the attached spreadsheet.
......
I have run hundreds of simulations to arrive at the shape shown above for the best efficiency.

Hi Rob,

Many thanks for your efforts and the answers. Very interesting you have reached that shape shown and what a pity a true 3D EM simulator with optimizing features cost 20-30k $s.  It is sure that the strength, the length and the OD of the permanent magnet used have got an effect on the sizes and the shape of the jacket and there is a best optimum ratio between the mentioned properties. With a 3D simulator this best relationship could be arrived at more precisely and closer to reality.

Regards
Gyula

[MeggerMan]

Hi Gyula,
I can do a sort of 3D shape in Femm, but it would be a sphere enclosing a cylinder sort of thing, with the outer sphere being the return path for the valve, an impossible shape to build granted.
Sort of like a tokomak reactor.
I did try a simulation with a 1" square magnet core and the results were no where near as good as the one I showed previous with what I think may be a 2" magnet core.
I will try again, but it should be able to scale down and get the same efficiency, if not, it could be that this only works on a larger scale.

Regards

Rob

[mark australia]

Hi Jack,
well done, and it will be interesting to see the alternator results. just curious how you measured the hp on the 2" magnet motor?
Mark