Halbach is not something specific to ironless stator / litz wire rotors, you can even use backiron with the halbach rotor to increase fields, although it does not make such a big difference as in a normal N-S rotor.
thanks for the explanation. i did not know about the fact that the magnets are twisted 90° for improving field strength, and this is the so called Halbach array. before i was the meaning those are the coreless PM BLDC motors.
well, i should have done this before: http://www.giyf.com/
now this means double strength or twice as thick magnets are not needed for same density.
thats all very interesting, and also the part about the closer sine wave form.
larsb, keep on with the great work. It is good to have such smart guys like you here in ES board
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