Title :
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
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;
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
DOI :
10.1109/EIC.2013.6554230
