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.
CNC machine, where computers are used to control the movement and operation of the mills, lathes, and other cutting tools.
Horizontal Lathe
Model 411 Horizontal Split Case
Machinist at Nickerson Company running a state-of-the-art CNC machine.
Figure 1. The general arrangement of a three phase waveform.
“NSF/ANSI 61.” NSF RSS. The Public Health and Safety Organization, n.d. Web. 07 June 2017.
Impeller wear ring
380 Series Vertical Inline Pump with VFD
Close-Coupled Vertical Turbine
Computer Numerical Control Machine (CNC) at Nickerson
Parley’s Water Treatment Plant. Photo credit SLCdocs.com
Horizontal Lathe
Gorman-Rupp SF Series® Submersible Solids-handling Pump
Super T Series® Engine Driven
Schlumberger Pump Assembly
Vertical Turbine Pumps, Deep Well
Utah Lake Cascade Pump
Ultra V Series® and UltraMate®
Submersible Turbine Pumps
Bowl wear ring
Horizontal Lathe
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.
Well Pump Installation
National Pump Vertical Turbine Pumps, API 610
SF Series®
Impeller wear ring
Computer Numerical Control Machine (CNC) at Nickerson