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.
Figure 1. The general arrangement of a three phase waveform.
Gorman-Rupp SF Series® Submersible Solids-handling Pump
3800 Series, Single Stage End Suction
Submersible Turbine Pumps
Close-Coupled Vertical Turbine
Horizontal Lathe
Utah Lake Cascade Pump
Well Pump Installation
380 Series Vertical Inline Pump with VFD
Schlumberger Pump Assembly
Super T Series® Engine Driven
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
CNC machine, where computers are used to control the movement and operation of the mills, lathes, and other cutting tools.
Model 411 Horizontal Split Case
Ultra V Series® and UltraMate®
Utah Lake Cascade Pump
Horizontal Lathe
Machinist at Nickerson Company running a state-of-the-art CNC machine.
Nickerson Field Crew
SF Series®
Vertical Lathe
Horizontal Lathe
Computer Numerical Control Machine (CNC) at Nickerson
