Relation between Magnetic Pole Arrangement and Magnetic Loss in Magnetic Bearing

One of the most expected features of magnetic bearings may be little rotational loss. However, observing a rotational motion of the machine, we find out the existence of drag torque which cannot be neglected. In this paper, the relation between magnetic pole arrangements of the radial magnetic bearing and magnetic loss in 5-axis controlled magnetic bearing is studied with Fourier analysis on magnetic fields. A few experimental results are reported also.