Gorman-Rupp SF Series® Submersible Solids-handling Pump
Ultra V Series® and UltraMate®
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.
Nickerson Field Crew
80 Series® Engine Driven
Model 411 Horizontal Split Case
Computer Numerical Control Machine (CNC) at Nickerson
Model 342A Single Stage End Suction
380 Series Vertical Inline Pump with VFD
Vertical Lathe
Machinist at Nickerson Company running a state-of-the-art CNC machine.
Vertical Lathe
Impeller wear ring
Utah Lake Cascade Pump
Super T Series® Engine Driven
SF Series®
Computer Numerical Control Machine (CNC) at Nickerson
Bowl wear ring
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.
National Pump Vertical Turbine Pumps, API 610
Horizontal Lathe
Submersible Turbine Pumps
Vertical Turbine Pumps, Deep Well
Close-Coupled Vertical Turbine
Figure 1. The general arrangement of a three phase waveform.
