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
Vertical Lathe
80 Series® Engine Driven
Model 411 Horizontal Split Case
Figure 1. The general arrangement of a three phase waveform.
Bowl wear ring
Computer Numerical Control Machine (CNC) at Nickerson
Utah Lake Cascade Pump
Machinist at Nickerson Company running a state-of-the-art CNC machine.
CNC machine, where computers are used to control the movement and operation of the mills, lathes, and other cutting tools.
Vertical Turbine Pumps, Deep Well
380 Series Vertical Inline Pump with VFD
Well Pump Installation
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.
“NSF/ANSI 61.” NSF RSS. The Public Health and Safety Organization, n.d. Web. 07 June 2017.
