... structure.Product Description:1.Magnetic levitation technology, no iron core, no hysteresis and cogging, low starting torque.2 ... .Compact, high-volume power ratio7.Due to no iron loss, low heat, small upward temperature. 8. ... phases three-phase power12Structure external rotor13Motor stator air-core coil14Motor rotor rare earth permanent magnet15Outer diametermm28516Lengthmm21117WeightKg1318Shaft ...