A Practical Primer On Motor Drives (Part 2): Single-Phase AC Line Voltage
by Ken Johnson, Teledyne LeCroy, Chestnut Ridge, N.Y, How2Power Today, Mar 15 2016
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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