Abstract
Highly dynamic induction motor drives require converter-driven low-inertia induction machines, which are continuously operated with high torque dynamics to accelerate and brake linear or rotating masses in a highly dynamic manner. However, every rapid change in the torque requires a correspondingly rapid change in the rotor current, which leads to the excitation of the transient skin effect in the massive rotor bars of squirrel cage motors. The additional eddy current losses resulting from the transient skin effect can cause overheating problems, especially in the case of deep rotor bars with fast load cycles. This paper is intended to show the reader how the additional rotor losses caused by the transient skin effect can be reduced through the design optimization procedure. At the same time, the other operating characteristics of the induction motor drive are not impaired. In addition, the moment of inertia of the drive motor can also be reduced as another optimization target by the multi-objective optimization process. As the underlying optimization algorithm, the differential evolution and the particle swarm optimization are implemented and compared with each other in order to verify the correctness of the optimization results. During the whole optimization work, great importance is attached to the interdisciplinary calculation method so that the interaction between the electromagnetic, thermal, fluid mechanical and control engineering processes can be taken into account through the coupled calculation. In the end, the theoretical and simulative findings are verified with two test benches.
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Acknowledgements
The authors thank the German Research Foundation (DFG) for funding this project (Project-No. HO 1483/60 1-3).
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Zhang, Y., Peng, H. & Hofmann, W. Transient skin effect in highly dynamic induction motor drives: energy-optimized design. Electr Eng 105, 1015–1024 (2023). https://doi.org/10.1007/s00202-022-01712-3
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DOI: https://doi.org/10.1007/s00202-022-01712-3