The stator winding is exposed on a flat disc, giving a short heat path so oil or water cooling can be applied directly; however, large-diameter flat seals are more prone to leakage under hot-cold cycling, demanding higher sealing quality.
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The stator and rotor are separated by a sub-millimeter air gap, and there is an axial attractive force of several metric tons between the magnets on both sides and the iron core. If the force on the air gap becomes uneven, the attractive force on one side increases exponentially, posing a severe challenge to the rigidity of the bearings and the housing.
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