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Overunity Machines Forum



Hilden-Brand Magnet Motor

Started by JackH, March 10, 2006, 11:58:55 PM

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gyulasun

#175
August 09, 2006, 05:44:43 PM
Oh, sorry I forgot to include and did not notice...

Here it is: http://www.ferroxcube.com/prod/assets/3c90.pdf

MeggerMan

#176
August 09, 2006, 06:05:04 PM
Yes, I have that printed off, just need to re-enter the values from the graph again, as there is a lead and lag line that I need to be between, I do not fully understand the two lines, but I can estimate where the middle line will be.
Then I can look at the simulation again.
I know it is going to be different, but what I am worried is that ferrite will not work well at all as a switch and that I will have no choice but to use laminate steel which has a massive saturation of over 2T where 3c90 is just over 400mT.


Many thanks.

Rob

MeggerMan

#177
August 10, 2006, 06:22:50 PM
Hi,
Finally I have loaded a rough curve for the ferrite 3c90 material into Femm.
See attached file that uses it as a material.

On state in the outer leg is 296 mT (20mA coil current)
Off state in the outer leg is 81 mT (no coil current)

This works very well and as it turns out should be more efficient than silicon steel at the lower power levels.
For proof of concept and ease of construction a Ferroxcube "E" core looks like a very good option.
Just need to start construction now that I am happy with the simulation results.

Regards

Rob

gyulasun

#178
August 11, 2006, 07:50:02 AM
Hi Rob,

Have you checked that with your latest simulation how much the flux is in the outer leg when you remove the permanent magnet and let the the 20mA current flow into the electromagnet? 
Would be curious to know.  Thanks.

Regards
Gyula

kadora

#179
August 12, 2006, 02:47:25 AM
Hi ROB
I have the same question like Guyla
because I am worrying that you will
get very similar field ratio between
state ON and OFF when permanent
magnet is not present.
I hope I am wrong.
Have a nice weekend.
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