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Articles in Industry Publications

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Understanding and applying line reactor and RFI filters with variable frequency drives

  • November 2009
  • Number of views: 3358
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Herb Prychodko 
Kentucky Service Co., Inc.

Lexington, Kentucky The advent of Variable Frequency Drives (VFDs) has allowed many applications to take advantage of the increased controllability of AC motors. This has resulted in a large increase in the use of these devices. However, an unwanted consequence of using VFDs is the distortion of the supply’s fundamental sine wave, commonly referred to as line harmon­ics. There are two types of harmonics, current and voltage. Remedial methods for both will be covered in this article.

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