Motors

Equipment and technology improvements can be sound investments.
Most of the electric motor information we use on a daily basis is pretty straightforward.
Due to the delicate nature of the cranberry, pump failure is not an option.
Currents are induced on the motor shafts when AC motors are employed with VFDs to drive air pumps, chillwater pumps and compressors in HVAC/R systems. Without a grounding device, these currents typically discharge through the motor bearings, causing frosting, pitting, fusion craters, and fluting.
The RPMAC PM Direct Drive Cooling Tower Motor and VS1CTD Drive for wet cooling towers replaces an existing motor, jack shaft and gearbox with a more efficient and environmentally responsible variable speed motor and drive with the motor mounted directly under the fan.
In many pump installations, problems such as jams and suction loss can lead to serious damage to the motor or pump long before the thermal overloads trip.
With highly reliable electrical systems, protective relays may be called upon to operate very infrequently.
With highly reliable electrical systems, protective relays may be called upon to operate very infrequently.
Proper alignment of the pump shaft with the driver can reduce vibration and significantly improve reliability.
Proper alignment of the pump shaft with the driver can reduce vibration and significantly improve reliability.
Unanticipated noise and vibration can be problematic for both occupants and processes within structures.
This article explains the differences between electromechanical and electronic overload relays and shows how the latter can provide better motor protection and increase safety.
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.
Owing partly to tradition, the shafts of electric motors are often larger than those of the equipment they drive.
Bigger is better — or at least it used to be
How do I move from my situation to a better one? In other words, is it possible to retrofit a less-than-optimal installation with a better solution, and how?
New motor starting controller provides one solution.
A paper or an electronic work order system can be used to capture alignment data.
Couplings are often forgotten until a project is nearing its end.
Couplings are often forgotten until a project is nearing its end.
Proper shielding and grounding are critical to successful operation.

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