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

[acp]

Honk, could you just clarify what sizes of magnet you are proposing to use? From your drawing the stator magnets are 80mm deep? is that correct? And rotor magnets also 80mm deep?

I will have a go at modelling it in FEMM. See what torque values that gives.....

[Honk]

The Rotor magnets:
Length (depth) = 3.149" (80mm)
Width             = 1.5"     (38.1mm)
Thickness       = 1.181" (30mm)

The Stator magnets:
Length (depth) = 3.149" (80mm)
Width             = 1.181" (30mm)
Thickness       = 0.157" (4mm)

Please see the autocad DWG attachment on the FBDISSM blueprint.
It might come in handy when you are going to modell the motor in FEMM.
Good luck. I'm curious of what force you get at the simulation.

[Honk]

Here is a 6 pole motor.
The electro magnets will fire 33% more often but the power output should increase more than the increased input.
Six poles could be good solution in order to increase the power density.

[Honk]

Hi there Acp.

I have converted the 6 pole FBDISSM motor to a couple of FEMM files to make it easy for you to simulate its torque.
The ZIP contain two FEMM files, both the loop entry position of the rotor magnets and the rotor end position.
All magnets are 80mm deep (length) and grade N45 (1.33T) but you have to set the grade yourself in the simulation.
These files have no magnetic parameters set.

Please make the FEMM simulation when you have some spare time and post the result here.
If you have the time it would be interesting to see the torque at different magnet grades, N35 (1.2T) and N52 (1.45T).

[Honk]

I did my regular rotor force calculation on the 6 pole motor during this weekend.
As I suspected the force went up a little more than 33%.

I got 343,6lb and when converted to ft-lbs I get 114,53 ft-lbs
I don't expect more output than maximum half of that torque = 114,53 / 2 = 57,265 ft-lbs
But the output is still very good using 6 rotor heads. The 500 RPM is just a potshot.

HP at 500 RPM = (57,265*2*3,14*500)/33000 = 5,45Hp = 4066 watt
The four pole was 4.05Hp. The 6 pole is 5,45Hp. That's a power density increasement of 34.6%.

The question is whether I will have all of this torque available when running the motor.
My force calculations is made at static mode and I guess it will change at full speed under load.
The other question mark it how much energy is required by the two electro magnets during full speed and load.

If someone here can handle FEMM I'd like you to download the files from above post and perform a force simulation.
You will have to set the magnetic properties yourself in the files. Please simulate all three grades N35, N45 and N52 if possible.
I have really tried FEMM myself but I find the interface totaly strange and I don't feel I have the time and energy to learn it.
But if we cooperate and help each other, the development phase will pass much faster and I can build a real prototype.