This paper discusses the design process of permanent magnet free brushless AC machine based actuators working in elevated-temperature environments for high-dynamic applications. Both demands given by the application with respect to maximum volume, torque over speed performance and the thermal limits of the insulation materials, which limit the maximal loss that may occur, have to be considered. Starting from the geometry, semi-analytic modelling approaches are used within an optimisation algorithm to obtain a machine design suitable for this application.
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