New Publication: Detecting Inter-Turn Short Circuits in Dual-Rotor Air-Cored PMSGs with Parallel-Connected Stator Coils
We are excited to announce our latest research presented at the 2025 IEEE Symposium on Diagnostics for Electric Machines, Power Electronics and Drives (SDEMPED), as part of the MEGA WAVE PTO project. This study investigates inter-turn short circuits (ITSCs) in dual-rotor, air-cored permanent magnet synchronous generators (PMSGs) with parallel-connected stator coils, a critical area for improving reliability in renewable energy generators.
About the research
Inter-turn short circuits (ITSCs) are among the most challenging faults to detect in permanent magnet synchronous machines (PMSMs). This study focuses on a dual-rotor, air-cored PMSG, which is widely used in wave, tidal, and wind energy systems due to its high torque density, low power consumption, and simplified mechanical integration.
To understand the impact of ITSCs and their progression, the research developed a validated finite element analysis (FEA) model and applied mathematical modelling to analyse multiple fault scenarios with varying severity. Conventional current-based detection methods were tested, such as Motor Current Signature Analysis (MCSA) and the Extended Park’s Vector Approach (EPVA). However, both faced challenges detecting low-severity faults, highlighting the need for alternative diagnostic strategies in low-frequency offshore energy applications.
Key contributions
Investigates ITSC detection in dual-rotor, air-cored PMSGs with parallel-connected coils
Combines FEA and mathematical modelling to analyse fault severity
Evaluates limitations of conventional current-based methods (MCSA, EPVA) under low fault conditions
Provides insights for developing more reliable diagnostic strategies for offshore renewable energy generators
Publication details
Title: Analysis and Diagnosis of ITSC in Dual-Rotor Air-Cored PMSG – Parallel Connected Stator Coils
Authors: Nikolaos Gkiolekas, Alexandros Sergakis, Markus Mueller, Konstantinos N. Gyftakis
Published in: 2025 IEEE Symposium on Diagnostics for Electric Machines, Power Electronics and Drives (SDEMPED)
Conference Dates: 24–27 August 2025, Dallas, TX, USA
DOI: 10.1109/SDEMPED53223.2025.11154141
Why this research matters
Reliable detection of inter-turn short circuits is essential for ensuring safe, efficient, and long-lasting permanent magnet generators in harsh offshore environments. This study's insights provide a foundation for more robust condition monitoring and fault-tolerant design strategies, advancing wave and tidal energy technologies under the MEGA WAVE PTO project.
For the latest updates on our research, stay tuned to the News Section of the MEGA WAVE PTO website.
