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Abstract
In electric motor-driven machines, mechanical torsional dynamics are nonlinearly coupled with the electrical system through the electromagnetic torque and the counter-electromotive force. In this paper, an approach based on small-signal linearization is proposed for modeling the steady-state torsional dynamics of the coupled system. Using the linearized model, resonance interference diagrams, torsional response, and stability can be evaluated rapidly across numerous operating points, while accurately accounting for the electromagnetic effects. The model is validated with conventional time-stepping simulations of two induction machines. An example analysis of a 3 MW motor-driven compressor train displays the modification of torsional properties due to the electromagnetic coupling effect and explains the mechanism of torsional destabilization. Finally, previously published measurements of a 37 kW motor test bench are considered to validate the instability of the elastic torsional mode predicted by the model.
Original language | English |
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Article number | 118780 |
Number of pages | 18 |
Journal | Journal of Sound and Vibration |
Volume | 596 |
DOIs | |
Publication status | Published - 5 Feb 2025 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Electric machine
- Electromechanical interaction
- Induction motor
- Structural dynamics
- Torsional vibration
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CO-DES: Digital transformation of collaborative powertrain design
Viitala, R. (Principal investigator), Miettinen, M. (Project Member), Hakonen, U. (Project Member), Ala-Laurinaho, R. (Project Member), Nieminen, E. (Project Member), Dömötör, A. (Project Member), Laine, S. (Project Member), Al-Shami, H. (Project Member) & Karhu, V. (Project Member)
01/01/2023 → 31/03/2026
Project: Business Finland: Strategic centres for science, technology and innovation (SHOK)
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CoE_MEC/Tammi: Suurnopeuksiset sähkömekaaniset energianmuunnosjärjestelmät (High-Speed Electromechanical Energy Conversion Systems)
Alamikkotervo, E. (Project Member), Miettinen, M. (Project Member), Hämäläinen, A. (Project Member), Hakonen, U. (Project Member), Laine, S. (Project Member), Miettinen, J. (Project Member) & Viitala, R. (Principal investigator)
01/01/2022 → 31/12/2024
Project: Academy of Finland: Other research funding