EC motor

EC fans are also known as Electronically Commutated motors or EC motors. A typical EC motor has a rotor of permanent magnets which rotates in (or around) the stator. The built-in fan speed controller generates electric current in the stator windings and converts the main (AC voltage ) into a DC voltage that is required to control the motor . Without this , it would not be possible to start up the motor.

Next to the mains (230 VAC power supply), it requires a control signal that specifies the requested fan speed. This control signal can be digital (Modbus RTU communication) or analogue (typical 0-10 Volt). The control signal can be generated manually via a control switch (in steps) or via a potentiometer. It can also be generated by an HVAC sensor or an HVAC controller. In that case, demand based fan speed control is possible. The main advantages of EC motors are: High energy efficiency, A long service life,Reduced noise, Relatively low electromagnetic interference (EMI)

The difference in energy consumption between an AC and an EC motors is clearly visiblee at reduced speed. At nominal speed, energy savings around 10 % can be achieved. However, the permanent magnets and the integrated electronics make this type of motor rather expensive. The higher purchase price is compensated by its lower energy consumption.

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EC motor