The way we control the speed of fan motors or pump motors has tremendously changed in the past two decades with the introduction of variable-frequency drives (VFDs), aka variable-frequency controllers ...

Should you specify an “inverter duty,” “inverter ready,” “inverter rated,” or a “VFD compatible” motor for your fans and pumps in HVAC applications? Is there a difference in these terms? Don’t answer ...

Sometimes one-size-fits-all is a good idea, but other times some research can yield a better solution. A generic beanie cap might fit anybody, but a dress shirt needs to be the right size. For ...

Matching drive to motor is essential to gain the best combination of torque, speed, and efficiency. Selecting the right drive is essential to getting the best performance and efficiency from an ...

Motors controlled by variable frequency drives (VFDs) are vulnerable to electrical bearing damage. A savvy specifier will choose new motors that are already equipped with shaft grounding rings, but ...

Electric motors fitted with variable frequency drives are at risk of bearing damage due to a build-up of current in the rotor that discharges through the shaft, damaging the lubrication and bearing ...