Analysis of times-to-failure of various turn insulations of form-wound coils under PWM voltage waveform

Author

Moonesan, Mohammad Saleh ; Jayaram, Shesha ; Cherney, Ed ; Omranipour, Ramtin ; Haq, Saeed Ul

Author_Institution

Electr. & Comput. Dept., Univ. of Waterloo, Waterloo, ON, Canada

fYear

2013

fDate

2-5 June 2013

Firstpage

187

Lastpage

190

Abstract

The paper presents the results of an experimental work to examine the times-to-failure of various types of turn insulations used in form-wound stator coils. A unipolar PWM waveform with a peak of 12 kV, rise time of approximately 270 ns and switching frequency of 3 kHz is used for aging. The types of insulations studied include enamel, Daglas®, mica tape with polyester film, and enamel plus mica glass tape. The time-to-failure data are analyzed using two-parameter Weibull statistics. The breakdowns are examined microscopically providing information as to the probable reason for the failures. The role of each type of insulation; enamel, Daglas® and mica polyester film tapes, and their dimensions are discussed to explain the times-to-failure under PWM aging.

Keywords

AC motors; Weibull distribution; ageing; coils; enamels; machine insulation; mica; reliability; stators; Daglas®; PWM voltage waveform; aging; enamel; form-wound stator coils; frequency 3 kHz; mica glass tape; mica polyester film tapes; times-to-failure data; turn insulations; two-parameter Weibull statistics; voltage 12 kV; AC motors; Aging; Coils; Films; Insulation; Pulse width modulation; Stress; PWM; form-wound; time-to-failure; turn insulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation Conference (EIC), 2013 IEEE

Conference_Location

Ottawa, ON

Print_ISBN

978-1-4673-4738-9

Electronic_ISBN

978-1-4673-4739-6

Type

conf

DOI

10.1109/EIC.2013.6554230

Filename

6554230