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There is a growing number of applications that require fastrotating machines; motivation for this thesis comes from a project in which downsized spindles for micromachining have been researched. The thesis focuses on analysis and design of highspeed PM machines and uses a practical design of a highspeed spindle drive as a test case. Phenomena, both mechanical and electromagnetic, that take precedence in highspeed permanent magnet machines are identified and systematized. The thesis identifies inherent speed limits of permanent magnet machines and correlates those limits with the basic parameters of the machines. The analytical expression of the limiting quantities does not only impose solid constraints on the machine design, but also creates the way for design optimization leading to the maximum mechanical and/or electromagnetic utilization of the machine. The models and electricdrive concepts developed in the thesis are evaluated in a practical setup.
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