Two Pole (Rail Magnet) - Magnetic Base, multi-purpose, 1 1/3 inch diameter, 1 inch high, 85 pound pull capacity with a 1/4-28 inch tapped hole and a 1/4-28 inch setscrew. Rare earth
Motor Magnets Total Solution- SDM Magnetics Co., Ltd.
Figure 2 from Operational characteristics of an IPM-type bearingless motor with 2-pole motor windings and 4-pole suspension windings | Semantic Scholar