This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Influence of Rotor Geometry on the Circulating Currents of a Delta Connected Electrical Machine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 05, 2022 by SAE International in United States
Annotation ability available
The increase in demand of electric vehicles leads to increased concentration towards the performance and stability of the electrical machines used. Compared to other electrical machines, the permanent magnet synchronous machines (PMSMs) are predominantly used in electric vehicles, due to its high efficiency and power density. The permanent magnets are generally placed in different configurations (like V-shaped, U-shaped, etc.), to achieve the required performance characteristics. But these non-linear arrangement of magnets leads to unbalanced flux linkage in the stator windings. This unbalanced flux linkage in different phase windings induces unbalanced back-emf, which results in unbalanced currents (generally termed as circulating currents). In case of star connected machines, these circulating currents are balanced with the help of neutral connection. Whereas these circulating currents are inevitable in delta connected machines, which leads to increased copper losses. This increase in copper losses affects the performance of the machine, rises the heat generation, and may also lead to demagnetization risks. In this paper, with the help of 140kW PMSM, the circulating currents are investigated. Also, a simple and effective method is introduced to reduce the circulating currents to a greater extend.
CitationPandiyarajan, R., Kondaveeti, Y., and Panchada, J., "Influence of Rotor Geometry on the Circulating Currents of a Delta Connected Electrical Machine," SAE Technical Paper 2022-28-0330, 2022, https://doi.org/10.4271/2022-28-0330.
- International Energy Agency ” https://iea.blob.core.windows.net/assets/12c809d6-5b1d-424a-aea5-77c39484efaf/GlobalEVPolicyExplorer_Final.pdf
- Press Information Bureau, Government of India https://pib.gov.in/PressReleseDetail.aspx?PRID=1570107
- Kant , K. , Kirtley , J. , Iyer , L. , and Schlager , G. Finite Element Simulation-Based Design Optimization of Permanent Magnet Motors considering Drive Cycle SAE Int. J. Elec. Veh. 10 2 2021 157 165
- Ramesh , P. and Lenin , N.C. High Power Density Electrical Machines for Electric Vehicles - Comprehensive Review Based on Material Technology IEEE Transactions on Magnetics 55 11 2019 1 21
- Abdallah , S.H. and Tounsi , S. Geometric Optimization Improving Performances of Permanent Magnet Synchronous Motors Using Analytical and Finite Element Methods Combined SAE Int. J. Elec. Veh. 11 1 2021 45 58
- Rehm , F. , Breining , P. , Decker , S. , Kolb , J. et al. Loss Comparison of Small Delta- and Star-Connected Permanent Magnet Synchronous Machines IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society Portugal 2019
- Shuting , W. , Heming , L. , Yonggang , L. , and Fanchao , M. Analysis of Stator Winding Parallel-Connected Branches Circulating Current and Its Application in Generator Fault Diagnosis Fourtieth IAS Annual Meeting, Conference Record of the 2005 Industry Applications Conference Hong Kong 2005
- Yamazaki , K. , Yui , H. , Ohguchi , H. , and Shuto , M. Loss Analysis of Permanent Magnet Synchronous Machines by Considering Circulating Currents of Armature Windings Wiley – Electrical Engineering in Japan 138 6 2019 553 560
- Kang , S.W. , Soh , J.H. , and Kim , R.Y. Model Predictive Control of Circulating Current Suppression in Parallel-Connected Inverter-Fed Motor Drive Systems Journal of Electrical Engineering and Technology 13 3 2017 1241 1250
- Maruyama , E. , Nakahara , A. , Takahashi , A. , and Miyata , K. Circulating Current in Parallel Connected Stator Windings due to Rotor Eccentricity in Permanent Magnet Motors IEEE Energy Conversion Congress and Exposition Denver, USA 2013
- Kim , K. , Hur , J. , Kim , B. , and Kang , G. Circulating Current Calculation Using Fault Modeling of IPM type BLDC Motor of Inter-Turn Fault International Conference on Electrical Machines and Systems Beijing, China 2011