An Electrically Commutated (EC) plug fans use a brushless EC motor in a backward curved motorized impeller (plug fan). The EC motor is actually a DC motor that can be connected to an AC supply line, due to a rectifier internal to the motor drive. Speed control is achieved by varying the control voltage from 0 – 10 VDC.

EC motors can be up to 30% more efficient than Induction motors, largely because the secondary magnetic field comes from permanent magnets rather than copper windings. The external-rotor arrangement for these motors also makes for a very compact fan design, and the use of electronics to convert and control the power supply offers up other power saving opportunities.

EC fans are now used extensively in various applications, both for newly manufactured equipment and for retrofit into existing plant such as computer room AC units, refrigeration condensers and general HVAC systems. An increasingly common application is their use as replacement ‘plug fans’ as a significantly more efficient Air Handler Unit (AHU) retrofit option over traditional scroll fans.

Benefits of EC fans over traditional fan and motor technology

• Reduced energy consumption.
• Integrated variable speed control capabilities to allow fan performance to accurately match varying air flow requirements without energy wasteful damping.
• EC motors maintain a high efficiency level at part speeds.
• Lower motor noise, particularly under speed control.
• On-board motor-electrical protection, no need for external line devices.
• Remote monitoring enabled via digital and analogue communication ports.
• Compact motors making them readily interchangeable for retrofits.
• Run cooler than AC induction motors, reducing heat put into air flow and leads to longer component life.

Disclaimer: The data and information contained in Armcor Air Solution technical specification sheets are representative of expected performance. They are derived from aggregated specifications of the individual components used in the equipment and not from verified laboratory testing. This should only be used for evaluating your specific application and clients have the sole responsibility of satisfying themselves that the goods or services are suitable for any specific use.