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.
Impeller wear ring
Ultra V Series® and UltraMate®
National Pump Vertical Turbine Pumps, API 610
Frame-mount Centrifugal Pumps
Utah Lake Cascade Pump
Model 411 Horizontal Split Case
SF Series®
3800 Series, Single Stage End Suction
Schlumberger Pump Assembly
Vertical Lathe
Utah Lake Cascade 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.
80 Series® Engine Driven
Custom fabrication to a large part
Machinist at Nickerson Company running a state-of-the-art CNC machine.
Nickerson Field Crew
Vertical Lathe
Bowl wear ring
380 Series Vertical Inline Pump with VFD
Figure 1. The general arrangement of a three phase waveform.
CNC machine, where computers are used to control the movement and operation of the mills, lathes, and other cutting tools.
Parley’s Water Treatment Plant. Photo credit SLCdocs.com
Submersible Turbine Pumps
Horizontal Lathe
Computer Numerical Control Machine (CNC) at Nickerson
