This paper discusses the design process of permanent-magnet-free 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, semianalytic modeling approaches are used within an optimization algorithm to obtain a machine design suitable for this application.