180 degree swapped radially magnetized rotor - magnet motor

[Low-Q]

[A author=Rapadura link=topic=8999.msg236251#msg236251 date=1270416415]
What is the force that makes the rotor (ring) magnet rotate? Magnetic attraction? Magnetic repulsion? An external force?

Sorry, my brain is not good interpreting complex drawings.
[/quote]There is the stator magnets that pulls and push the rotor around - both attraction and repulsion- , but these stator magnets needs to swap polarity where the ringmagnet have a change in polarity (Which is present at two places 180 degrees apart) - in order to be in the correct mode for maintaining torque in the rotor.
I am performing a (Time consuming) calculation of torque in both the rotor and the statormagnets when they swap polarity. In the calculations, I have choosed to spend 30 degrees of the revolution to swap polarity, and let 15 degrees have no change (As there are 45 degrees (30 + 15) between each stator pair). I will be finished tomorrow. It looks like the result is closing to zero as the calculations are dangerously proving that there is a major counterforce in swapping polarity, but we'll se tomorrow. It's late.

Vidar

[Blainiac]

Your calculation is going towards 0 eh?  That's too bad.  It always is both depressing and a valued lesson to see how nature is always going to find a way to stop us!  Haha.  I do enjoy your extremely creative and though-provoking ideas though Vidar!  Keep it up.   

[Low-Q]

The rotor alone have an average of approx 900Nm. Half way in polarity swap requires in average 90Nm countertorque. But then the countertorque seems to explode.... I do not look forward to do the remaning calculations...

[jonifer]

900 N/M approximately equal 900 kW - electrical power/hour - which magnet diameter do your mind?

[Low-Q]

Well,

I am finished with the calculations. The result is promising, if I have done it right.

Method:
The polarity swap of the stators repeats every 45 degrees rotation of the rotor.

30 degrees of these are used to gradually swap stator polarity by 180 degrees, where:
Average rotor torque during this operation = 523Nm
Average stator torque during this operation = -322Nm (Both pairs are accounted for)

15 degrees is pure rotor torque with no counter torque:
Average rotor torque during these 15 degrees = 1017Nm

So the average torque is then:
[(15 x 1017Nm) + (30 x [523Nm - 322Nm])] / 45 = 473Nm

The question is then how the torque of the statormagnets are calculated. They should probably be a great deal higher as there is a gear ratio that I have not taken into account yet - between the stator magnets and the rotor.

I will try to calculate this later.

For now I will live in the hope of OU for a while

Vidar