7Nakahama T, Biswas D, Kawano K, et al. Improved cooling performance of large motors using fans [J]. IEEE Trans On Energy Conersion, 2006, 21(2) : 324 - 331.
8Dabala K. Analysis of mechanical losses in three-phase squirrel-cage induction motors [C]//Electrical. Proc of the 5th ICEMS. Shenyang, China: IEEE Press, 2001, 1:39 - 42.