Pumps & Systems, April 2013
Pumps & Systems, March 2013
Last year, a Pumps & Systems reader asked about matching variable frequency drives (VFDs) and motors.
I received many comments on my four-part series on AC Power, and most of them were very positive.
As a follow up on my AC Motors series, I thought it would be a good idea to provide a short overview of work, power and torque as it applies to the AC motor.
The industrial motor world has a new specification available for defining the requirements of general purpose, severe duty motors in the 250- to 3,000-hp range.
Last September, we spoke about the importance of pipe-to-piping alignment, evaluating actual numbers, and tabulating stress values as they approach yield stress of pipe at various values of misalignment. This time, we will discuss the effects of pump-to-motor misalignment, beyond hype or generalities, by numerically quantifying the conclusions.
This month we will quickly look at the load types that comprise a typical AC circuit.