TY - CHAP A1 - Kasten, Henning A1 - Che, Guoyi A1 - Beineke, Stephan T1 - PM-machines with an additional shielding sleeve to reduce the rotor losses T2 - Electromechanical Drive Systems 2021; ETG Symposium N2 - Rotor losses have a major impact on the performance of high-speed permanent magnet synchronous machines. Therefore a way to reduce rotor losses by using shielding cylinders is proposed and the effects of these measure are discussed according to the main causes of the rotor losses, which are current harmonics and winding harmonics. The loss minimisation will be demonstrated a for a specific high-speed motor design. Y1 - 2021 UR - https://ieeexplore.ieee.org/document/9735213 SN - 978-3-8007-5685-8 SP - 1 EP - 6 PB - VDE ER - TY - CHAP A1 - Messager, Gael A1 - Che, Guoyi A1 - Kasten, Henning A1 - Redemann, Christian T1 - Optimization of axial magnetic bearing for application of vibration assisted drilling T2 - IKMT 2022; 13. GMM/ETG-Symposium, Linz, Austria N2 - Thrust magnetic bearing characteristics are frequency dependent due to the eddy-currents inducted inside magnetic parts that oppose any change of magnetic flux in the inner parts. When used as linear actuator for vibration assisted drilling in industrial production, eddy-currents limit the maximum achievable stroke and vibration frequency with active thrust bearing. This reduces tool-feed rate or shortens tool average useful life. After introducing the problem, material properties and shape optimization are evaluated and compared in the frequency range of interest for vibration assisted drilling. While material properties are determinant, mechanical constraints often limit the selection to materials with significant electrical conductivity. Eddy-current effect can only be partially mitigated with shape optimization. Y1 - 2022 UR - https://ieeexplore.ieee.org/document/10025986 SN - 978-3-8007-5938-5 SP - 1 EP - 6 PB - VDE ER -