A Practical Primer On Motor Drives (Part 2): Single-Phase AC Line Voltage

Focus:

Targeting newcomers desiring a broad overview, this article series explains the basics of motor drives from the input signals (ac line inputs) through motor shaft sensing (mechanical power) and all relevant areas in between. In this part 2, the concepts of ac voltage, current and power as they relate to motor drives are explained. This section is meant to familiarize readers with the basic conventions of ac power distribution as may be encountered in residential or commercial applications, where single- or three-phase power is brought from the utility pole into the customer’s premises. Concepts such as RMS, peak, and peak-to-peak voltage and the relationships between them are reviewed. With this background, the basic methods of measuring single-phase ac voltages using oscilloscopes are explained and demonstrated.

What you’ll learn:

• How to understand the basic concepts of ac voltage, current and power distribution (wiring) in single and three-phase electrical systems
• How to measure single-phase ac voltages using oscilloscopes

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Author & Publication:

Ken Johnson, Teledyne LeCroy, Chestnut Ridge, N.Y, How2Power Today, Mar 15 2016

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