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Overunity Machines Forum



Permanent magnet assisted motor coil designs

Started by captainpecan, January 24, 2022, 02:35:06 AM

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0 Members and 19 Guests are viewing this topic.

captainpecan

Okay, I reversed the changes I made, and did some more tweaking of things. Interesting enough, it actually performs better with a little wider gap between stator and rotors. I ran some tests and kept making small changes until I got the best result. I guess having all like poles on the rotor needs a bit more gap to get clearly defined separate poles for best performance. At least that appears to be the case.


Now, I am noticing if I completely disconnect 2 of the 3 coil pairs, I get better performance from an individual coil pair. I also get much cleaner scope readings and way stronger fly back spike. As was suggested helping me understand weird readings on the scope, I am getting some feedback from the other coils effecting each other. This is really hurting the performance. I need a better motor driver circuit or a better way to isolate each mosfet. I am thinking of ordering the parts to build a motor driver circuit that was posted earlier in this thread. Does anyone have any good ideas of a simple way I can stop some kind of random feedback I am getting with my circuit? I have it posted above. The problem occurs when more than one reed switch is closed at the same time. Something is looping back and I can't seem to easily nip it in the butt. Any suggestions appreciated.

gyulasun


On your post #179: Can it be that the steel material you added to reduce the gap introduced unexpected eddy current loss?   

Now that you reversed the changes as you wrote in reply #180 and have some better results you noticed that a single coil pair gives better operation than 3 pairs together, this is the next step to find out why.   
Try to reduce the supply voltage to say 3-5 volts only for ALL the 3 MOSFETs and see whether the problem occurs at such low levels. If the problem is not present, then try increasing the supply voltage gradually.   
If the problem is present at the 3-5 volt supply, then run one switch only for one coil pair from say 12V supply and if this operation is acceptable, then use a 2nd MOSFET switch from 3-5 V supply only if you can and see whether the problem comes up already.   

You did not mention whether you changed for instance the 10 k gate-source resistors to say 1 kOhm?   
I do not say this is the problem, perhaps just an additive to  it.  Remotely is hard to comment.

captainpecan

I will be working on it some more tonight, so I'll try and narrow things down like you mentioned. I did forget to mention that i did change resistors to the gates. I was a little surprised no change at all. Not even current draw. But that was before I noticed there is interferance between coils anyway. As soon as I only connect 1 coil pair, the flyback over doubles and looks more normal. So until i fix that interferance, I'm not even sure the changes would have shown anything to me anyway. I would like to build a circuit citfa shared with me here but I'm short a few components. I think I will take inspiration from it and try putting each coil pair between 2 mosfets. Maybe it will better isolate each set of coils.

captainpecan

Well, I got a little further. I was only able to find 1 P channel mosfet to use so I could only try on 1 coil until I cam find more or figure the proper way to use 2 N chanel instead. But I simply put my coil between a P chanel and an N chanel. Each with a resistor pulling them up or down. I put a reed between the gates. It works very well and a nicer sharp pulse with a solid strong fly back. I now am able to see a current increase and decrease as I adjust resistance on the gates as suggested earlier. I think I may have the solution that will work for me and I am still able to use bare minimum current. Hopefully. Fingers crossed. Now to get my hands on some P chanel mosfets or find the best way to use all N chanel so I can see if all 3 pairs work in unisom without interferance.

Cadman

Quote from: captainpecan on April 23, 2022, 04:53:16 AM
Well, I got a little further. I was only able to find 1 P channel mosfet to use so I could only try on 1 coil until I cam find more or figure the proper way to use 2 N chanel instead. But I simply put my coil between a P chanel and an N chanel. Each with a resistor pulling them up or down. I put a reed between the gates. It works very well and a nicer sharp pulse with a solid strong fly back. I now am able to see a current increase and decrease as I adjust resistance on the gates as suggested earlier. I think I may have the solution that will work for me and I am still able to use bare minimum current. Hopefully. Fingers crossed. Now to get my hands on some P chanel mosfets or find the best way to use all N chanel so I can see if all 3 pairs work in unisom without interferance.
Hi captainpecan,

Now you are talking about something similar to what I have been experimenting with all winter. Charging a coil between 2 mosfets, disconnecting the coil and at the same instant reconnecting it to a separate circuit before the field can collapse in order to collect the inductive discharge as a separate entity. I think this method has a lot of potential.

So far, due to my non-existant electronics skills,  I've fried a ton of both P&N mosfets so, please, if you would share any circuits for this I sure would appreciate it.

Regards

edit: I mean any circuits you use with your experiments on this thread..