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Design considerations for an inverter output filter to mitigate the effects of long motor leads in ASD applications

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2 Author(s)
von Jouanne, A. ; Dept. of Electr. & Comput. Eng., Oregon State Univ., Corvallis, OR, USA ; Enjeti, P.N.

Design considerations for an inverter output filter to mitigate the effects of long motor leads in adjustable-speed drive (ASD) applications are presented. It is shown by analysis that, for a given length of cable, reducing the dv/dt of the pulsewidth modulated (PWM) inverter output voltage applied to the cable below a critical value will eliminate overvoltages due to voltage reflections. Design issues for a low-pass filter at the inverter output terminals to reduce the dv/dt of the inverter output pulse are examined in detail. The filter operation is verified for the entire variable frequency range of the inverter. The performance of the filter is evaluated through simulations and experimentally on a 460 V commercially available AC motor drive (PWM insulated gate bipolar transistor (IGBT)). The proposed inverter output filter is then compared with a motor terminal shunt filter also designed to reduce overvoltages and ringing at the motor terminals

Published in:

Industry Applications, IEEE Transactions on  (Volume:33 ,  Issue: 5 )

Date of Publication:

Sep/Oct 1997

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