This study aims to show an approach for the dynamic simulation of a synchronous machine. The magnetic forces in the air gap are calculated efficiently using simplified approaches without neglecting important effects. For the modeling of the magnetic forces, an equivalent magnetic circuit is constructed in which the magnetic saturation and the leakage flux are taken into account and coupled with the electrical circuit at the end. The calculated magnetic forces are then passed to a mechanical model of the motor. Together with a predefinable load torque, the resulting motor rotation and the forces in the bearings are identified.The presented model is then investigated in a small example. This novel approach is intended to provide a method of calculating dynamically the forces transmitted from the shaft to the motor housing and to create the basis for evaluating electric motors for vibrations, noise, and harshness under varying loads and input voltages.

ÐA method to design a variable flux electric machine using no rare earth materials is proposed. Starting from a synchronous reluctance machine's rotor the electromagnetic and mechanical design goals are derived. To improve torque production radially magnetized low coercive field magnets are inserted in the rotor, allowing for a control of the rotor flux. The flux guidance is improved by removing the webs required for mechanical sturdiness, which is achieved instead by mold injecting fiber reinforced polymer into the flux barriers. On the basis of a large design of experiments and using Gaussian process regression models, the relation between the rotor design parameters and output torque as well as external fields in the magnets is investigated and an optimization is performed. The resulting machine design allows an operation with high torque without involuntary demagnetization. The potential of the polymer filled flux barriers is confirmed through structural mechanical analysis.Index TermsÐDesign of experiments, electric machines, finite element analysis, modeling, multi material design, optimization, reinforced polymers, rotor design, structural design This work was part of the research project ºReMosº (ºEffiziente Reluktanzmaschine fÈ ur effiziente MobilitÈ at ohne seltene Erdenº),financed through the Ministry of Science, Research, and Arts of the Federal State of Baden-WÈ urttemberg in the framework of ºInnovationscampus MobilitÈ at der Zukunftº.

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