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A Practical Primer On Motor Drives
by Ken Johnson, Teledyne LeCroy, Chestnut Ridge, N.Y.

Many excellent textbooks have been written on the subject of motor drives. But most of these require prerequisite knowledge and/or are difficult sources of basic understanding for newcomers.

While there is also useful information on the internet, such material is typically aimed at narrow applications or specific products and markets.

In addition, many of the public domain materials lack “real-world” examples that are vital to gain a full understanding of the topic. Both textbooks and the internet are more useful references given a broad overview.

This extensive article series aims to provide such an overview by explaining the basics of a motor drive from the input signals (ac line inputs) through motor shaft sensing (mechanical power) and all relevant areas in between.

It targets newcomers to these fields desiring a broad overview before seeking deeper technical information from other sources. Part 1 offers an introduction to this series including an outline of the topics that will be addressed in the upcoming parts.


Part 1: What New Design Engineers Need To Know

Part 2: Single-Phase AC Line Voltage

Part 3: Three-Phase AC Line Voltage

Motor Drives


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To learn more about motor drive design, see these articles published by How2Power and other sources

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