Simple to make Hilden-Brand style motor

[gyulasun]

Hi Ron,

I have to think this over tomorrow but is it really needed to keep any 2 coils ON for at least half a revolution?   I have to finish now,  and I understand you have the latching type Hall sensor. The parallel diode may work differently with another Hall sensor (not a latching one).

Gyula

[kekko.alkemi]

Hi, glad you joined us

I have a question:

Have you any idea what is force amplification factor in your motor?
I mean what is the torque with magnets versus torque without magnets.
It still works without magnets, yes?

This is VERY important, if you have not tested it maybe you could try it in simulator, as I understand you have proper simulation of your motor.

Thanks in advance!

Hello, the amplification factor in our engine is 1:4 as regards the torque in the static regime, but in dynamic regime the efficiency does not exceed 99%.
Remove the magnets to the motor that stops and does not work.
Greetings Francesco.

[yssuraxu_697]

Wow, superb work! 

In terms of efficency I see 2 clear problems (not counting controller):

Freedom of movement may be a bit too large (but on the other hand mechanical losses are less this way).

But the real bugger is the amount of neo magnets - I suspect that core may be saturated. Scienculo downgraded magnets 2 times. From big neos to small ones, and after that to ceramics - and only then he made a hint about OU.
In your case you could remove some middle ones and leave airgap, just to see how it effects the system and if it affects it in the good way replace as many as possible with steel spacers.

At least thats the theory, but I tend to do my homework well so...

But for metal work of this class I have no tools or skills Respect!

[kekko.alkemi]

Congratulations for your engine! What do you Used in the electronic, mosfet or IGBT?

Are you able to calculate the performance of your engine, torque and RPM?

[yssuraxu_697]

but in dynamic regime the efficiency does not exceed 99%.

Hi, does that 99% stand like some "magic wall" or you think that it can be crossed with better materials, windings, smaller airgap etc improvements? In general (with other type motors) people report huge improvements when switching to modern core materials etc.

Could you post the FEMM file of your motor for others to investigate? I have some ideas what may be the fundamental problem. Would be interesting to experiment with model of the real motor.

I think with joint effort 100% can be crossed. It is purely an engineering problem, not theoretical impossibilty.

Edit: Actually if you have 99% mechanical output then 100% of total output is far behind, if you count in Joule heating and other losses.