Computer Numerical Control Machine (CNC) at Nickerson
380 Series Vertical Inline Pump with VFD
Frame-mount Centrifugal Pumps
Close-Coupled Vertical Turbine
Horizontal Lathe
3800 Series, Single Stage End Suction
Figure 1. The general arrangement of a three phase waveform.
Bowl wear ring
Impeller wear ring
Computer Numerical Control Machine (CNC) at Nickerson
Horizontal Lathe
CNC machine, where computers are used to control the movement and operation of the mills, lathes, and other cutting tools.
Model 342A Single Stage End Suction
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
Impeller wear ring
Parley’s Water Treatment Plant. Photo credit SLCdocs.com
Vertical Lathe
Model 411 Horizontal Split Case
Gorman-Rupp SF Series® Submersible Solids-handling Pump
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.
