Study on breakdown of magnet wire used in AC traction motor

Author

Tong, Laisheng ; Wu, Guangning ; Zhang, Guoqin ; Lin, Tongguang

Author_Institution

Sch. of Electr. Eng., Southwest Jiaotong Univ., China

Volume

1

fYear

2005

Firstpage

172

Abstract

AC traction motors are fed by fast switching inverters in express locomotive. Inter-turn insulation of AC traction motors is electrically more stressed than that in the conventional. In order to investigate the service life of AC traction motors, mechanism and characteristics of dielectric breakdown of magnet wire used in AC traction motors are studied in the paper. Experiments have been carried out on specimen according to the condition of AC traction motor. Aging factors of magnet wires under continuous pulses are introduced and influence of inorganic fillers on insulation aging is analyzed. Breakdown points are analyzed through energy spectrum analysis and electron microscopic photograph. Finally, the breakdown mechanism of magnet wire is explained by conducting micro-crack theory.

Keywords

ageing; electric breakdown; insulating materials; invertors; machine insulation; switching convertors; traction motors; AC traction motor; dielectric breakdown; electron microscopic photograph; energy spectrum analysis; express locomotive; inorganic fillers; insulation aging; interturn insulation; magnet wire traction; microcrack theory; switching inverters; Aging; Cable insulation; Dielectric breakdown; Dielectrics and electrical insulation; Electric breakdown; Electrons; Inverters; Magnetic analysis; Traction motors; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulating Materials, 2005. (ISEIM 2005). Proceedings of 2005 International Symposium on

Conference_Location

Kitakyushu

Print_ISBN

4-88686-063-X

Type

conf

DOI

10.1109/ISEIM.2005.193364

Filename

1496086