Title :
Insulation stress in PWM driven adjustable frequency drives
Author :
Arora, T.G. ; Aware, M.V. ; Tutakne, D.R.
Author_Institution :
Electr. Eng. Dept., R.T.M. Nagpur Univ., Nagpur, India
Abstract :
Pulse-width modulated (PWM) adjustable frequency drives (AFDs) are extensively used in the industries for control of induction motors. It has led to significant advantages in terms of the performance, size, and efficiency but the output voltage waveform no longer remains sinusoidal. Hence overshoots, high rate of rise, harmonics and transients are observed in the voltage wave. They result into increased voltage and thermal stresses. Motor insulation not designed to sustain such high stresses may fail prematurely. In this paper insulation stress parameters are experimentally computed for wide range of switching frequency. They are quantitatively compared with the sinusoidal voltage. The results can be used to estimate the accelerated insulation aging due to PWM drive in low voltage induction motors.
Keywords :
ageing; induction motor drives; insulation; machine control; variable speed drives; AFD; PWM driven adjustable frequency drives; accelerated insulation aging; induction motor control; low voltage induction motors; motor insulation; paper insulation stress parameters; pulse-width modulation; thermal stress; voltage stress; voltage waveform; Dielectrics; Harmonic analysis; Induction motors; Insulation; Pulse width modulation; Stress; Switching frequency; Dielectric loss; insulation stress; peak voltage; rate of rise of voltage; thermal stress and voltage transients;
Conference_Titel :
Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2013 10th International Conference on
Conference_Location :
Krabi
Print_ISBN :
978-1-4799-0546-1
DOI :
10.1109/ECTICon.2013.6559471
