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

authored by

Jan Ole Stockbrügger, Bernd Ponick

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.

Organisation(s)

Institute of Drive Systems and Power Electronics

Type

Article

Journal

Energies

Volume

14

ISSN

1996-1073

Publication date

01.2021

Publication status

Published

ASJC Scopus subject areas

Control and Optimization, Energy (miscellaneous), Energy Engineering and Power Technology, Electrical and Electronic Engineering, Fuel Technology, Renewable Energy, Sustainability and the Environment

Sustainable Development Goals

SDG 7 - Affordable and Clean Energy

Electronic version(s)

https://doi.org/10.3390/en14010174 (Access: Open)