... output, with rare earth permanent magnet, multi-polar, small gap, high power density5.Low speed direct drive, ... ratio7.Due to no iron loss, low heat, small upward temperature. 8.Simple structure, easy to ... permanent magnet15Outer diametermm28516Lengthmm21117WeightKg1318Shaft Diameter mm4019Materials of Case Aluminium Alloys20Materials of Shaft Carbon steel 2012 newest 400W low rpm Permanent Magnet ...