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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 ...

Variable-speed options are abundant in HVAC and their impact has been felt industry-wide. Contractors and manufacturers alike have taken to these single- and two-stage alternatives as ways to enhance ...

If you run your variable frequency drives at 60 Hz and below, you are not alone. Nearly all the VFDs in North America operate below this nominal frequency threshold. Yet a growing number of ...

When high torque, a tight design, and always-reliable gear motors are required, worm gear motors rise to the top. Such systems are effective in many cases, such as a worm gear motor for robotics and a ...