October 30, 2024，By Graduate School of Shandong University、Sponsored by the Postgraduate Affairs Department of the Party Committee，The 60th issue of 2024 (the 1397th issue in total) "Jixiafeng" graduate student academic forum hosted by the School of Electrical Engineering was held in the lecture hall on the fourth floor of the Electric Power Building on Qianfoshan Campus。This forum invites Professor Frédéric Gillon from the Ecole Polytechnique Centrale in Lille, France, and Associate Professor Nicolas Bracikowski from the University of Nantes, France to give lectures，The forum is hosted by Associate Professor Gong Jinlin。

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  Professor Frédéric Gillon’s report focused on the application of topology optimization strategies in the design of electromagnetic equipment, especially motors。Topology optimization is often used to design structures，That is, optimization of key electromagnetic parameters within a limited volume。Professor Gillon shows how to apply 2D modeling、Calculation methods such as mesh magnetoresistive network (MEC) and finite difference method，Optimize the topology design of complex electromagnetic equipment。Also，Professor Gillon gave a detailed explanation of fast optimization algorithms such as the adjoint variable method，Shows how to reduce computation time while maintaining an efficient design flow。

  Another focus of the report is Additive Manufacturing, AM) technology application in electromagnetic equipment。Via Additive Manufacturing，Especially low-cost metal 3D printing technology，The key components of the motor can be directly printed according to the optimized design。This technology application makes high-precision manufacturing possible，And can reduce the manufacturing time and cost of traditional processes。Report introduces different additive manufacturing methods，such as fused deposition modeling (FFF)、Selective Laser Sintering (SLS)、Digital Light Processing (DLP), etc.，And demonstrated the performance optimization effect of the electromagnetic material core structure manufactured by these technologies。Especially using filled polymer particles for low-cost 3D printing，Efficient magnetic material molding was achieved in experiments，Significantly improves the magnetic performance and mechanical strength of the device。

  final，The report looks forward to the future development direction of optimized design of electromagnetic equipment。Proposed by Professor Gillon，The combination of topology optimization and additive manufacturing will be expected in dual excitation motors、Bringing more efficiency to electrical systems such as induction motors、Lightweight design solution，Provide important support for sustainable development in the field of electrical engineering。

Lecture Topic (2): Electromagnetic Transient Modeling and Topology Optimization

  Subsequently，Associate Professor Nicolas Bracikowski gave a wonderful report on electromagnetic transient modeling and topology optimization。The report focuses on electromagnetic field modeling of highly integrated electrical equipment，Focus on how to deal with complex electromagnetic disturbances and optimize equipment performance in motors and power grid equipment。Professor Bracikowski introduced in detail the electromagnetic transient characteristics in transformers、Importance in systems such as generators，In-depth analysis of how these devices encounter geomagnetic induced currents、Response characteristics during interference such as lightning。His research accurately simulates electromagnetic field changes in transformers and coaxial magnetic gears through numerical methods，Emphasized the role of topology optimization technology in improving equipment efficiency、Application value in reducing vibration and enhancing overload protection。

  Also，Professor Bracikowski showed the key research results of his team in recent years，Including multiple electromagnetic transient research projects in cooperation with Electricite de France (EDF)。He also explained the progress of topology optimization technology in detail，Especially in the shape and structure optimization of coaxial magnetic gears，Improving device performance and reliability by optimizing size and shape。

  At the end of the academic report，Participating teachers and students took a group photo together。This issue of "Jixiafeng" graduate academic forum ended successfully with sparks of wisdom and warm applause。

  About the speaker:

  Frédéric Gillon，Professor of École Centrale de Lille, France、Doctoral Supervisor，Mainly engaged in research work in the field of high-performance motor optimization design，Served as a member of the school’s professor committee since 2024，Served as a member of the school’s academic committee from 2018 to 2023，Served as the director of the electrical engineering department of the school from 2014 to 2018。With Jeumont Electric、Alstom、Long-term cooperation with Renault and other companies，Jointly train PhD students，Has trained 18 doctors and 9 postdocs，Published more than 60 international journal papers，117 international conference papers。

  Nicolas Bracikowski，Associate Professor, Electrical Engineering Laboratory (IREENA), Université de Nantes, France、Doctoral Supervisor，Mainly engaged in multi-physics modeling and optimization design research of high-performance motors，Served as the head of international exchange of the laboratory since 2021，Served as a member of the laboratory committee from 2022 to present，Elected as co-leader of the laboratory motor team in 2024。With Electricite de France (EDF),Long-term cooperation with motor company Leroy Somer and others，Jointly train PhD students，Has trained 6 doctors and 3 postdocs，Published more than 20 international journal papers，47 international conference papers。