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Leakage current and common mode voltage issues in modern AC drive systems

Adabi Firouzjaee, Jafar, Zare, Firuz, Ledwich, Gerard F., & Ghosh, Arindam (2007) Leakage current and common mode voltage issues in modern AC drive systems. In Australasian Universities Power Engineering Conference, 2007 (AUPEC 2007), 9-12 December 2007, Perth, Western Australia.

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Abstract

Due to rapid developments of IGBT technology, switching time and frequency are dramatically increased. At higher carrier frequencies, IGBTs induce more capacitive coupled current into a rotor and a stator frame and lead to faster bearing damage. Common mode voltage enables motor to create shaft voltage through electrostatic couplings between the rotor and the stator windings and between the rotor and the frame, and it can caused bearing currents when the shaft voltage exceeds a breakdown voltage level of the bearing grease. Also, high frequency leakage current occurs through stray capacitors between stator winding and the motor frame due to a high rate of the common mode dv/dt at motor terminals which can produce induced shaft voltage. Conducted and radiated Electromagnetic Interference (EMI) emissions are major problems in recent motor drives that produce undesirable effects on electronic devices. In modern power electronic systems, increasing power density and decreasing cost and size of system are market requirements. Switching losses, Harmonics and EMI are the key factors which should be considered at the beginning stage of a design to optimise a drive system. In most of power electronic designs, EMI issues have not been taken into account as one of the main factors; and mitigation techniques for EMI are considered at the last stage of design. This paper presents main EMI issues in a modern AC drive system.

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ID Code: 14281
Item Type: Conference Paper
Keywords: AC motor drives, electromagnetic coupling, electromagnetic interference, leakage currents, power electronics
DOI: 10.1109/AUPEC.2007.4548097
ISBN: 9780646494883
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2007 IEEE
Copyright Statement: Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Deposited On: 05 Aug 2008
Last Modified: 29 Feb 2012 23:33

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