8Siemens Brothers & Co.Ltd,Francis Lydall.Improvements in polyphase induction motors:British 16839[P].1902-7.
9Louis J.Hunt.The‘cascade'induction motor[J].Institution of Electrical Engineers,1914:406-434.
10A.R.W.Broadway,L.Burbridge.Self-cascaded machine:a low-speed motor or high frequency brushless alternator[C].Proceedings,Institution of Electrical Engineers,1970:1277-1290.