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.
Vertical Lathe
80 Series® Engine Driven
Close-Coupled Vertical Turbine
CNC machine, where computers are used to control the movement and operation of the mills, lathes, and other cutting tools.
Schlumberger Pump Assembly
Parley’s Water Treatment Plant. Photo credit SLCdocs.com
Model 411 Horizontal Split Case
Vertical Lathe
Impeller wear ring
Machinist at Nickerson Company running a state-of-the-art CNC machine.
380 Series Vertical Inline Pump with VFD
Gorman-Rupp SF Series® Submersible Solids-handling Pump
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.
Horizontal Lathe
Horizontal Lathe
Submersible Turbine Pumps
Utah Lake Cascade Pump
Figure 1. The general arrangement of a three phase waveform.
Frame-mount Centrifugal Pumps
Bowl wear ring
Impeller wear ring
3800 Series, Single Stage End Suction
Computer Numerical Control Machine (CNC) at Nickerson
