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Analytical Determination of the Slot and the End-Winding Portion of the Winding-to-Rotor Capacitance for the Prediction of Shaft Voltage in Electrical Machines

Author

Listed:
  • Jan Ole Stockbrügger

    (Institute for Drive Systems and Power Electronics, Leibniz University Hannover, 30167 Hannover, Germany)

  • Bernd Ponick

    (Institute for Drive Systems and Power Electronics, Leibniz University Hannover, 30167 Hannover, Germany)

Abstract

Common-mode voltage, caused by a 2-level inverter, is a source of discharge currents in motor bearings. Due to the capacitive coupling, between the stator winding and the rotor, an image of the common-mode voltage is produced on the shaft—which can exceed the dielectric strength of the lubrication film of motor bearings. Accurate determination of the winding-to-rotor capacitance is necessary to predict the shaft voltage. This article proposes a novel analytical determination of the slot and the end-winding portion of the winding-to-rotor capacitance. The calculation rules, which are based on the method of image charges and the charge simulation method, take into account the continuity and the boundary conditions of the field areas. Results are validated by means of finite element method simulations. Notably, deviations are in the single-digit percentage range. Furthermore, the presented methods are simple to implement.

Suggested Citation

  • Jan Ole Stockbrügger & Bernd Ponick, 2020. "Analytical Determination of the Slot and the End-Winding Portion of the Winding-to-Rotor Capacitance for the Prediction of Shaft Voltage in Electrical Machines," Energies, MDPI, vol. 14(1), pages 1-13, December.
    • Handle: RePEc:gam:jeners:v:14:y:2020:i:1:p:174-:d:473096
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    Cited by:

    1. Sebastian Berhausen & Tomasz Jarek, 2022. "Analysis of Impact of Design Solutions of an Electric Machine with Permanent Magnets for Bearing Voltages with Inverter Power Supply," Energies, MDPI, vol. 15(12), pages 1-19, June.

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