NDLI: Suppression for discharge bearing currents in variable-frequency motors based on electromagnetic shield

Content Provider	IEEE Xplore Digital Library
Author	Bai, B. Wang, Y.
Copyright Year	2015
Description	Author affiliation: Shenyang Univ. of Technol., Shenyang, China (Bai, B.; Wang, Y.)
Abstract	The inverter outputs high frequency common mode voltage, which excites the parasitic capacitance in the motor, and the high frequency current flows through the parasitic capacitance forming high frequency discharge bearing current (HFDBC) and voltage across the stator and rotor (bearing inner race and outer race) is defined as shaft voltage[1-3]. The discharge occurred in the bearing inner ring, causing pitting and fluting in the bearing races when charges is accumulated enough in the air-gap capacitor. Actually, the high-frequency discharges bearing current are the main cause of bearing failure. Furthermore, the bearing currents cause the vibration and noise and affect the stability of the system. Therefore, the suppression of high-frequency discharge bearing currents is concerned in this paper. Bearing currents suppression techniques commonly used in an engineering project include common-mode voltage filters, ceramic bearings, and shaft-ground connection with an electric contact brush. In addition, dual-bridge inverters which can reduce bearing currents effectively have been proposed by some scholars [4]. The static charge dissipation method was utilized creatively to suppress the bearing voltages [5]. This paper proposed a novel suppression technique based on theory of electromagnetic shielding. By finite element simulation, starting performance analysis of the motor and prototype experiment, electromagnetic shielding effectiveness will be evaluated.
Starting Page	1
Ending Page	1
File Size	553811
Page Count	1
File Format	PDF
e-ISBN	9781479973224
DOI	10.1109/INTMAG.2015.7157222
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-05-11
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Discharges (electric) Parasitic capacitance Rotors Inverters Shafts Stator windings
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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