Under the high-frequency and high-dv/dt pulse excitation of SiC inverter, hairpin winding (HW) is susceptible to nonuniform voltage stress, which will threaten its insulation reliability. Currently, new topologies of HWs are constantly emerging, but most focus on low-loss design, with limited studies addressing low-voltage stress. This lack of attention leads to hidden dangers in their reliability design. In order to bridge this gap, this article conducts a comprehensive comparative analysis of the interturn voltage stress of HWs with different topologies. First, the high-frequency equivalent circuit model of single-turn coil, considering bilateral conductor coupling effect of HWs, is proposed and validated through experiments. Then, the high-frequency models of HWs with various topologies are established, and the corresponding interturn voltage stress distribution is calculated using the field-circuit coupling finite-element method. Finally, through comprehensive analysis and comparison, this article presents low-voltage stress design principles for HWs from the perspectives of insulation design and transposition topology.
Interturn Voltage Stress Comparison and Analysis of Different Typology of Hairpin Windings for EV Traction Machines
IEEE Transactions on Transportation Electrification ; 11 , 1 ; 1257-1267
01.02.2025
3190642 byte
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch