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.
Well Pump Installation
Gorman-Rupp SF Series® Submersible Solids-handling Pump
Vertical Lathe
Bowl wear ring
Figure 1. The general arrangement of a three phase waveform.
Bowl wear ring
Computer Numerical Control Machine (CNC) at Nickerson
Custom shapes cut from raw materials.
CNC machine, where computers are used to control the movement and operation of the mills, lathes, and other cutting tools.
80 Series® Engine Driven
Horizontal Lathe
Machinist at Nickerson Company running a state-of-the-art CNC machine.
Vertical Lathe
Ultra V Series® and UltraMate®
Submersible Turbine Pumps
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.
