Title :
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
fDate :
10/1/2010 12:00:00 AM
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;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TDEI.2010.5595539
