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.
Model 342A Single Stage End Suction
80 Series® Engine Driven
Bowl wear ring
Frame-mount Centrifugal Pumps
Machinist at Nickerson Company running a state-of-the-art CNC machine.
“NSF/ANSI 61.” NSF RSS. The Public Health and Safety Organization, n.d. Web. 07 June 2017.
380 Series Vertical Inline Pump with VFD
Utah Lake Cascade Pump
Bowl wear ring
Vertical Turbine Pumps, Deep Well
Impeller wear ring
Nickerson Field Crew
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.
Schlumberger Pump Assembly
Well Pump Installation
Vertical Lathe
National Pump Vertical Turbine Pumps, API 610
Ultra V Series® and UltraMate®
Horizontal Lathe
Figure 1. The general arrangement of a three phase waveform.
