Design and evaluation of high-speed solid rotor induction machine supported by AMBs with a multidisciplinary tool

For high-speed electrical machines compact design is one of their advantages and further system integration is required to increase a system efficiency. A growing level of the technical system integration may cause additional design problems and increase design time. In this work the design procedure and design optimization of high-speed electrical machines supported by Active Magnetic Bearings (AMBs) are described. First, the design of the high- speed induction motor, bearings, and rotor are analyzed. Then, the boundary conditions and optimization variables are selected based on the key system performance indicators. The optimization variables include, for example, rotor outer diameter, number of rotor bars, slit depth ratio, and some other. Finally, an optimization procedure is presented, including objectives for the optimization procedure, fitness function, and selected algorithm. The pre- sented procedure is tested with an example of high-speed induction machine with solid rotor equipped with AMBs. Based on the optimization results the prototype is constructed. An implementation of the optimization procedure prevented extra iterations during the final design stage and reduced total design time. With slight modifications this procedure is applicable for other types of high-speed electrical machines supported by AMBs.