F.B.D.I.S.S.M - Flux.Boosted.Dual.Induction.Split.Spiral.Motor.

[Low-Q]

I did a few more accurate simulations and got an average torque of (Resolution is now 0,5 degrees) :

8872Nm with the electromagnet active for 15 degrees revolution, with stator magnets
3901Nm with the electromagnet active for 15 degrees revolution, without stator magnets

I am simulating a very big botor, so this difference is maybe not more than the inaccuracy of the simulations.


Vidar

[Honk]

Hi Vidar.

I cannot tell if your simulation was any good or not. I don't know how to operate Femm.

And I don't know how you could simulate any torque without the stator magnets in place.
When the rotor magnets are out of electro magnet position you have zero stall torque.
Your simulations must calculate stall torque in various positions. when you do this you'll
see that using stator magnets will create torque to twist the rotor. Without the stator no twist.

You could use the original simulation file posted here to see if you get some other output.
ACP got 50.85Nm torque in his simulation using grade N37. My calculations is based on N45.
http://www.overunity.com/index.php/topic,3456.msg54963.html#msg54963

It's not the first time Femm have been flawed in situations it haven't been programed to cope.

[Low-Q]

Hi Vidar.

I cannot tell if your simulation was any good or not. I don't know how to operate Femm.

And I don't know how you could simulate any torque without the stator magnets in place.
When the rotor magnets are out of electro magnet position you have zero stall torque.
Your simulations must calculate stall torque in various positions. when you do this you'll
see that using stator magnets will create torque to twist the rotor. Without the stator no twist.

You could use the original simulation file posted here to see if you get some other output.
ACP got 50.85Nm torque in his simulation using grade N37. My calculations is based on N45.
http://www.overunity.com/index.php/topic,3456.msg54963.html#msg54963

It's not the first time Femm have been flawed in situtations it haven't been programed to cope.

I will simulate this once. It is just so many nodes in the drawing that it takes forever to calculate just one sample. It will take time, so I have to simulate it tonight and let the computer finish the calculations during the night. Probably I will sample just 60 degrees, at 0,5 degree resolution, as it is 6 equal poles in the rotor.

btw: Shouldn't it be an electromagnet at the end of each stators?

Vidar

[Honk]

Yes, but I haven't drawn the electro magnets in these drawings. I just wanted to see the stall torque of the rotor.
You can look at the PDF how they are designed and then insert them yourselves before simulating.
The blue area is just the winding. You don't need to draw that to perform the simulation.

[acp]

Femm can't simulate this properly, look at the reszlts of the simulation, all the flux is concentrated around the ends of the spiral. Because the program is 2d it can't simulate the flux lines flowing under and over the spiral which is what happens in real life.
The flux lines have to complete a closed circuit because the program is 2d the only way the magnets can complete the cycle is by looping around each end of the spiral.
I allready tried some practical experiments, and from what I can see, the spiral behaves quite differenty than that shown by Femm, It has some torque around the whole spiral as Honk predicted and not just at the extreme ends as shown by the Femm simulations.