Abstract
Ultra-high speed machines have drawn more and more interest for researchers in recent times. Switched reluctance machines (SRMs) are of particular interest due to their simple rotor geometry. For ultra-high speed machines, rotor dynamics are a major component and must be considered in the design stage. In this paper, a rotor dynamic study of an ultra-high speed SRM with a rated speed of 1 million rpm is presented. First, different rotors built with isotropic and orthotropic materials are studied, using both analytical and numerical methods. Then, the impact of using a laminated stack versus a solid stack is studied. Finally, three different geometries of single, tandem, and bilateral rotor shafts are proposed, analyzed and compared based on their cost, torque density, manufacturing complexity, and rotor dynamic stability.
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