Motors used for refrigeration equipment (including air conditioning systems) are hermetic. When we say “hermetic,” what do we mean? It’s a motor that’s sealed from the outside. In the case of ...

Providing modern electronic devices with a diet of healthy power is not straightforward. Small AC-connected equipment often uses a capacitor-input filter following a half- or full-wave rectifier.

[Editor's Note: The need for controlling the level of harmonic current in power distribution systems is widely recognized as an important factor in selecting and applying adjustable-speed drives (AFDs ...