Analysis of thermal stresses in medium-voltage motor coils under repetitive fast pulse and high-frequency voltages

Author

Sharifi, Emad ; Jayaram, Shesha H. ; Cherney, Edward A.

Author_Institution

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

Volume

17

Issue

5

fYear

2010

fDate

10/1/2010 12:00:00 AM

Firstpage

1378

Lastpage

1384

Abstract

The paper provides an analysis of the thermal stresses in medium-voltage form-wound motor coils that arise from pulsed width modulated, repetitive square-wave, and impulse voltages. The effects of the shape, repetition rate, and rise and fall time of the pulses are studied through experimental and computational work. Based on the frequency spectra of the pulse trains and their corresponding signal powers, it is shown that a set of sinusoidal high-frequency voltages of predetermined amplitudes can effectively produce consistent thermal stresses, and both the experimental and simulation results confirm the validity of the proposed scheme.

Keywords

electric motors; machine testing; machine windings; thermal stresses; high frequency voltages; impulse voltages; medium voltage form wound motor coils; medium voltage motor coils; repetition rate; repetitive fast pulse; repetitive square wave; thermal stress; Coils; Harmonic analysis; Insulation; Pulse width modulation; Stress; Switching frequency; Thermal stresses; Nonlinear field dependent stress grading, conductive armor tape; thermal stress, PWM and square wave voltage, coupled electro-thermal FEM modeling;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/TDEI.2010.5595539

Filename

5595539