Influence of sleeve on rotor eddy current loss in 10kW permanent magnet BLDC motors

In this paper, the rotor eddy current losses in no load condition and load condition were calculated by the software MagNet for two 10 kW, 14000 r/min permanent magnet brushless DC(PM BLDC) motors whose rotor sleeves material are carbon-fiber and stainless steel respectively. And then, the prototype machines were fabricated and tested. It is shown that the carbon-fiber is superior to stainless steel in terms of reducing rotor losses and raising efficiency.