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 ...

DC fans are called upon by engineers in many situations and applications to provide forced-air convection cooling. Thanks to their widespread use, they are relatively easy to understand and can be ...

Head over to Amazon to get the Dyson Hot+Cool AM09 Jet Focus Heater and Fan for just $350, down from its usual price of $500. That’s a discount of $150 and 30% off. The dual hot-and-cool design keeps ...