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.
Vertical Lathe
Vertical Turbine Pumps, Deep Well
3800 Series, Single Stage End Suction
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.
Computer Numerical Control Machine (CNC) at Nickerson
Figure 1. The general arrangement of a three phase waveform.
380 Series Vertical Inline Pump with VFD
National Pump Vertical Turbine Pumps, API 610
Computer Numerical Control Machine (CNC) at Nickerson
Model 411 Horizontal Split Case
Schlumberger Pump Assembly
Gorman-Rupp SF Series® Submersible Solids-handling Pump
