Analysis of Shaft Voltage and Bearing Current in an Inverter-Fed Nongrounded Motor

• Tagami Kotaro

  Utsunomiya University

• Ogasawara Satoshi

  Utsunomiya University

• Funato Hirohito

  Utsunomiya University

• Kanazawa Hidetoshi

  TOSHIBA CARRIER CORPORATION

• Uesugi Michika

  TOSHIBA CARRIER CORPORATION

• Moizumi Kenichi

  TOSHIBA CARRIER CORPORATION

Bibliographic Information

Other Title

• インバータ駆動非接地モータの軸電圧とベアリング電流の解析
• インバータ クドウ ヒセッチ モータ ノ ジク デンアツ ト ベアリング デンリュウ ノ カイセキ

Abstract

This paper analyzes shaft voltage and bearing current in a nongrounded motor driven by a voltage-source PWM inverter. First, the shaft voltage of the nongrounded motor is measured. The experimental results indicate that a bearing current, which can not be explained by the conventional theory, exists, and that the bearing current may shorten the life of the motor bearing. To investigate the mechanism, some experiments and parameter measurements are done, and simulation models are built. As a result, it is shown that this issue is caused by unbalance in the inductance and stray capacitance of the motor windings and these resonant phenomena.

Journal

• IEEJ Transactions on Industry Applications

  IEEJ Transactions on Industry Applications 127 (3), 286-292, 2007

  The Institute of Electrical Engineers of Japan

Keywords

• shaft voltage
• bearing current
• common-mode voltage
• ungrounded motor
• winding inductance
• stray capacitance

Details

• CRID: 1390282679635018368
• NII Article ID: 10018737982
• NII Book ID: AN10012320
• DOI: 10.1541/ieejias.127.286
• BIBCODE: 2007IJTIA.127..286T
• ISSN: 13488163
• ISSN: 09136339
• NDL BIB ID: 8732484
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8732484
• Web Site: http://www.jstage.jst.go.jp/article/ieejias/127/3/127_3_286/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed