I'll ask a silly question here, why not skew the cuts so the magnets are on a skewed angle as well? It would have reduced the cog, I think. Maybe Zubbly can answer this one.
Keep up the good work WXYZ! >> all energy used to produce this comment or post came from solar and wind energy! It works!
It would also cause horrid gap problems if you were to skew straight mags on a cylinder.
.............oztulesFlinders Island Australia[ Parent ]
Though there would be another method of skewing, I think. If you have a 4pole motor, don't put the magnets on 0deg; 90 deg; 180 deg; 360 deg. But instead, for example 0 deg; 80 deg; 180 deg; 260 deg; 360 deg. That should solve the cogging too (I think! haven't tried; also, the exact amount of offset depends on the amount stator gaps!), without a need for skewing of either stator or magnets. Note that this is just an idea (not my own anyway) and I have never tried it or seen it tried!
Peter.[ Parent ]
Unless you machine flats on the shaft it is fairly easy to shift the magnets with this method to find the best position.
This seems a better way than skewing rectangular magnets on a rotor, the increased air gap to clear the corners does mean using more magnet material.
With proper curved magnets and a uniform air gap, magnets 1/4" thick should be adequate. You will likely need 1/2" thick for skewed rectangular ones. Flux[ Parent ]
