Super high speed electrical machines - summary

There is increasing interests in super-high-speed motors and generators in industry applications such as microgas turbines, compressors, blowers, pumps, hybrid electric vehicles, turbo-molecular pumps, machine tool spindle drives, information storage disk drives and etc. In this paper, the state of the art survey of super-high speed electrical machines presented. Recent development of high speed and power ranges are summarized. Various structures of electrical machines, including induction, permanent magnet, claw pole, homopolar, axial gap synchronous and switched reluctance machines, are reviewed from the point of view of high rotational speed characteristics. Emerging technologies such as bearingless operation and intelligent controls are introduced in other papers of the panel session