A Passive EMI Filter for Eliminating Both Bearing Current and Ground Leakage Current from an Inverter-Driven Motor

Author

Akagi, Hirofumi ; Tamura, Shunsuke

Author_Institution

Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol.

fYear

2005

fDate

16-16 June 2005

Firstpage

2442

Lastpage

2450

Abstract

This paper presents a practical approach to eliminating both bearing current and ground leakage current from an inverter-driven motor rated at 400 V and 3.7 kW. When the shaft voltage with respect to the motor frame exceeds the dielectric breakdown voltage of thin lubricating grease films in two metal bearings at the drive and non-drive ends, an electrical discharge machining (EDM) current flows through the bearings. A passive EMI filter can keep the shaft voltage in check, as a result of having eliminated high-frequency common-mode voltage from the motor terminals. Hence, no dielectric breakdown occurs in the grease films, so that no EDM current flows in the bearings. Experimental results verify the viability and effectiveness of the passive EMI filter designed in this paper

Keywords

AC motor drives; electric breakdown; electromagnetic interference; invertors; machine bearings; passive filters; power filters; thin films; 3.7 kW; 400 V; bearing current; dielectric breakdown voltage; electrical discharge machining; ground leakage current; inverter-driven motor; motor terminals; passive EMI filter; shaft voltage; thin lubricating grease films; Breakdown voltage; Dielectric breakdown; Dielectric thin films; Electromagnetic interference; Induction motors; Leakage current; Machining; Passive filters; Pulse width modulation inverters; Shafts;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 2005. PESC '05. IEEE 36th

Conference_Location

Recife

Print_ISBN

0-7803-9033-4

Type

conf

DOI

10.1109/PESC.2005.1581975

Filename

1581975