ABB drives - Technical guide No. 4, Guide to variable ...

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Technical Guide No. 4Guide to variable speed drivesABB drives2 Guide to variable speed drives | Technical Guide No. 4Technical Guide No. 4 | Guide to variable speed drives 3 Copyright 2011 ABB. All rights subject to change without notice. 3AFE61389211 REV C Guide No. 4Guide to variable speed drives4 Guide to variable speed drives | Technical Guide No. 4Technical Guide No. 4 | Guide to variable speed drives 5ContentsChapter 1 - Introduction ........................................ ....................................7Gen eral ........................................ ........................................ ..............7Chapter 2 - Processes and their requirements ........................................ ..8Why variable speed control?

sists of three parts. Regular 50 Hz 3-phase current is fed in to the rectifier part, which converts it to direct current. The DC voltage is fed into the DC bus circuit, which filters the pulsating voltage. The inverter unit then connects each motor phase either to the negative or the positive DC bus according to a …

  Phases, Three