Non-Circulating Bearing Currents in Drum-Winding Machine: Threat Level and Role of End Windings
Year: 2025
Type: conference-paper
Abstract: Bearing currents are a significant challenge in electric machines, particularly in variable speed drives with modern fast-switching frequency converters. This study focuses on non-circulating bearing currents in drum-winding machine, a specialized machine type characterized by unique stator winding configurations. The study centers on a 27 kW, 100 krpm axially laminated synchronous reluctance machine, optimized for high power density and compactness through a drum-winding configuration. While bearing currents are a known challenge in conventional electric machines, the unique electrostatic characteristics of drum-wound designs introduce new considerations. This paper investigates the winding-to-rotor capacitance, the distribution of parasitic capacitances between core and end-winding regions, and their potential impact on non-circulating bearing currents. The findings aim to deepen the understanding of electrostatic phenomena in drum-winding machines and evaluate the threat level for circulating bearing currents in the machines with specific design features like large distance from winding to rotor and deep narrow stator slots.
Institution: Lappeenranta-Lahti University of Technology
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4412021414