Hilden-Brand Magnet Motor

[MeggerMan]

Hi Albert,

Not sure what simulation you are using but everything I have done in Femm 4 proves it does as Jack has suggested.



Regards
Rob

[Honk]

What you are doing is totally over powering the permanent magnet using 26 Watts. When you do that you are puting the north pool of the coil core in the same way the north pool of the permanent magnet is.  When you over power the coil core it will try to de-magnitize the permanent magnet.

Later,,,,,Jack W Hildenbrand

Thanks very much Jack. Very nice of you to take the time to explain it carefully for me.
Now I understand what you meant by de-magnetizing the inserted magnet.
I imagined that the flux from the N48 magnet would continue to flow parallel to the
electro magnets flux even when the power was increased beyond 10W.
I thought this was how you could give your motors more current when loaded down at
the sacrifice of efficience when the magnets flux became lesser than the electro flux.
Your motor is more complicated then I originally thought and I bow deeply to the
effort you have invested in bringing us such wonderful technology. 

Best Regards / Honk

[acp]

Hi Meggerman, Is your sim with current applied? if so, a lot of the flux is still being short circuited down the iron sleeve. For what purpose is the curved metal piece at the bottom? You say it works as Jack says, what force values did you get for your sim?
If you want to calculate force in FEMM, you must have an air gap in order to integrate. Also try using a finer resolution on the metal parts, this will give better results.



For me, I'm still confused about Jacks valve, In my simulation I adjusted the current so that the flux density was similar in the iron sleeve and the magnet, this means all of the flux will be used to attract the side piece, and none will be shortcircuited down the iron sleeve as when no current is applied. What I would find interesting is if jack would replace the magnet with a lump of iron the same size as the magnet ( it would be a pure electromagnet then) and see how much force that generates.  If it generates the same force then the magnet isn't doing anything. 



Best regards

Albert

[JackH]

Hello Albert,

[Liberty]

Hello Jack,

Have you tried experimenting with different coil shapes and types? 

Here is an attempt at a picture to show you an idea that I wonder if you have considered?

                             ===coil
                             ===
                             === 
       |--------------------------------|
       |      Magnet valve jacket            | Laminated
       |                                             |Steel
       |--------------------------------|
                             ===
                             ===
                             ===coil

Coil not length of valve jacket but stacked up high (like tesla's bifilar coil, layered over small area of valve jacket) instead of the length of the valve jacket.  Wonder if this would reduce the coupling of back emf in coil while still allowing the magnetic valve to work?  Was thinking it might help reduce power input requirements to your motor during operation, if it still allows your magnet valve to work right? 

An alternative and maybe better idea would be to use two narrow high stacked tesla bifilar coils, one at each end of valve stacked high rather than a long solenoid coil shape.  A strategy to reduce back emf coupling into coil to help reduce motor input power required during operation.