Introduction to EC Plug Fans
🍃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.
Efficiency and Design Advantages
🤝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.
Applications of EC Fans
EC plug 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.
Application of Centrifugal Fans
Centrifugal fans are used in applications such as central air conditioning installation or ventilation systems of buildings.
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