A VFD and a permanent magnet, direct-drive motor replace a gearbox, reduce maintenance costs and provide energy savings.
Why Wye? Why Delta?
Last of Three Parts
VFDs Save Energy in Pump Applications
Using variable frequency drives provides many benefits to end users.
Electric Motor Repair & Reliability
Repetitive motor failures may be caused by a lack of diagnostic or forensic repair information reported to the motor owner.
Long-Term Motor Reliability
A variable frequency drive’s effect on system efficiency and motor life
Internal Clearance & Its Effect on Bearing Fatigue Life
End users must include bearing clearance as an integral part of designing or building a pump.
Motor Nameplate Letter Code Designations
Learn how to avoid misinterpretations.
Protect Operators and Equipment with  Arc-Preventive Motor Control Centers
A strong safety program and preventive equipment are crucial for operator and equipment safety.
Powering the Pump: Diesel Versus Electric Motors
Make the ideal motor selection for irrigation applications.
Last year, a Pumps & Systems reader asked about matching variable frequency drives (VFDs) and motors. “I have a spare pump in my warehouse that requires 15 horsepower (HP) at best efficiency...
Plant Upgrades Improve Efficiency at Midwest Refinery
Equipment and technology improvements can be sound investments.
Stainless Steel Motors
In the food industry, stainless steel performs more productively and efficiently.
Top-of-Motor Vibration
A simple mathematical model can be used to estimate vibration at the top of the motor in a vertical pump-motor structure.
Resonance and Its Effects on Mechanical Structures
Understanding resonance is essential for solving problems of increased vibration. Resonance is a condition that can occur in mechanical structures and can be described as sensitivity to a certain...
Alignment Tolerances
The biggest decision is determining which tolerances to align. In the alignment training classes that we teach, questions arise about alignment tolerances. We often ask, “What are your...
Drives to Reduce Harmonics
Cost-effective solutions reduce harmonics and improve system reliability, efficiency. Energy efficiency requirements, regulatory compliance, increasing energy costs and improving system and...
Vertical Motors Help Solve Pumping Problems
The benefits of these motors provide the flexibility needed for challenging pump applications. In the early 1920s, California’s agricultural industry was booming. As the demand for the Golden...
How Motors Have Changed the Pump Industry
Read more about The History of Pumps here. Electric motors have had a huge impact on the pump industry. While it is not certain how centrifugal pumps were powered in the early days, it is...
Environmentally-Friendly HVAC Solution
Improved motor starters help Fabri-Kal achieve its green vision.Fabri-Kal's 400,000-square-foot plant in Kalamazoo, Mich., was formerly a vacant brownfield site that was transformed during the last...
The economic downturn has delivered a heavy blow to the industrial manufacturing sector in North America. Manufacturers are indicating sales drops of 30 percent to nearly 60 percent compared to that...
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. I will provide a reference to a more in...
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. I will provide a reference to a more in...
AC Motors Part 3-Single Phase Operation
It has been said that Washington, D.C., is the home of the largest invertebrate population in the U.S. This, of course, jokingly refers to the population of politicians and their lack of backbone or...
The frame sizes (physical dimensions) of AC motors have changed substantially through the years. Originally, they were considerably larger than those in use today. This increased size was the result...
The frame sizes (physical dimensions) of AC motors have changed substantially through the years. Originally, they were considerably larger than those in use today. This increased size was the result...
AC Motors Part 5: AC Motor Life
One of the major impacts on motor life is common sense—or maybe the lack thereof!It always amazes me how many open drip proof (ODP) motors are used in agricultural irrigation applications where...
AC Motors Part Two-Three Phase Operation
Although a number of AC motor designs are used, the induction motor is, by far, the most common and will be the topic of this column. We will also focus on the three-phase design as it provides a more...
AC Motors: Magnetism and the DC Motor
I received many comments on my four-part series on AC Power, and most of them were very positive. Several readers, however, thought they were too elementary. Ireminded them that the title of my column...
AC Power (Part Four): Transformers
Last of four partsLast month, we studied the properties and effects of resistive, inductive and capacitive loads in an AC circuit. This month, we will take self induction a step further and apply it...