Figure 2. A simple sine wave with a period of 360° and an amplitude of 1. In single phase power the x-intercepts are 180° from each other. A full period is 360°. A single phase motor has a crest approximately every 16.5 milliseconds giving the motors a tendency to vibrate more, which may contribute to a shortened bearing life.
Parley’s Water Treatment Plant. Photo credit SLCdocs.com
Model 411 Horizontal Split Case
Submersible Turbine Pumps
Ultra V Series® and UltraMate®
Horizontal Lathe
Computer Numerical Control Machine (CNC) at Nickerson
380 Series Vertical Inline Pump with VFD
National Pump Vertical Turbine Pumps, API 610
Bowl wear ring
Gorman-Rupp SF Series® Submersible Solids-handling Pump
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Vertical Turbine Pumps, Deep Well
Figure 3. Three phase power has three identical sine waves overlapping at an offset of 2π/3 radians or 120°. When one phase reaches an x-intercept or node the next phase is only 30° and approximately 5.6 milliseconds from reaching its crest.
CNC machine, where computers are used to control the movement and operation of the mills, lathes, and other cutting tools.
