Parallel Path Magnet Motor

[FatChance!!!]

My regular Magmotor S28-400 also gives 84% efficiency. Nice but no big deal.

I really think you need to invest in some large design improvements to reach
better efficiency or just check whether the magnets do any useful work or not.

Step 1) Replace the magnets with fitted SiFe steel pieces and remake the tests.

Step 2) Get big powder core toroid's and mill out the same shapes & pieces to fit the motor.
           Then wind the motor with multi stranded Litz wire instead of regular round wire.
           Make the tests and notice the efficiency improvement.

Are you using tight airgaps between the rotor and stator. A thumb rule is 0.1-0.2mm airgap.
I've seen motor tests where 25% torque was lost at 0.2mm compared to 0.1mm airgap.

[scianto]

My regular Magmotor S28-400 also gives 84% efficiency. Nice but no big deal.

I agree, it's hopelessly low. Normal solid state circuit where you pulse the motor coil gives me 96% efficiency (the shaft is not turning).

Step 1) Replace the magnets with fitted SiFe steel pieces and remake the tests.
Step 2) Get big powder core toroid's and mill out the same shapes & pieces to fit the motor.

I already told my friend about it, he said he will do that with next model. I don't know when he finds time. Since I have no machines to do it myself, I must wait for him.

Are you using tight airgaps between the rotor and stator. A thumb rule is 0.1-0.2mm airgap.

Well when I look at the distance between the rotor and stator it seems to me it's really large, maybe 1 mm.

[FatChance!!!]

Well when I look at the distance between the rotor and stator it seems to me it's really large, maybe 1 mm.

Thanks for all your answers. I guess we will have to wait for him to help you out.
Regarding the airgap you should try keeping this as small as possible in your next model.
No more than 0.2mm if possible.
Good luck. I will patiently wait to read about your progress.

[scianto]

Thanks for your support FatChance!!!.
I am experimenting with what I have and trying different setups, solutions, implementing different ideas etc. And there is a lot to check. Until my friend is ready with a new device, I have plenty of things to try. Hopefully it will give us something usable.

BTW, to all reading this, if you have any PPMT device and if you are willing to lend it to me, so that I can make tests on it; please, contact me.

[scianto]

Here are the two schematics, circuits I am using to run the PPMMs:

http://servilo.website.pl/laboratorio/esploroj/rownolegle_strumienie/SRSM2i3_sterowanie_rys1.png
and
http://servilo.website.pl/laboratorio/esploroj/rownolegle_strumienie/SRSM2i3_sterowanie_rys12.png