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Axair Fans has established long term partnerships with manufacturers ECOFIT s.a. (France) and ROSENBERG Gmbh (Germany), and are now able to offer Energy Efficient EC fans and air movement products. Both Ecofit & Rosenberg develop and manufacture their own motors and fans. The Ecofit EC range use motors from 65 up to 113Wa, the Rosenberg range use motors from 1.1 up to 3.4Kwa motors.
EC stands for Electronically Commutated and combines AC and DC voltages, which is essentially a fan with a brushless DC motor, bringing the best of both technologies : the motor runs on a DC voltage, but with a normal AC supply. DC motors already have low power consumption but if used in an AC application, the power needed converting AC to DC, using a bulky, inefficient transformer. The EC motor incorporates voltage transformation within the motor. The non-rotating part of the motor (stator) is extended to make room for an electronic PCB board which includes power transformation AC to DC, as well as the controls.
All the features of the external rotor motor are kept, including compact assembly, easy speed controllability, efficiency and characteristics.
With an EC motor the electronic circuitry stands in lieu of the traditional mechanical commutation meaning the right amount is being supplied in the right direction at exactly the right time providing precise motor control.
EC motors have a near flat efficiency curve which barely varies across the speed rang. A range of which is not limited by synchronous speeds or susceptible to voltage variations liek its AC counterpart. Its AC equivalent will operate at a precise point on the curve which equates to its maximum efficiency, either side of this point and the efficiency diminishes.
Typical AC motors have losses in terms of power consumption (copper + iron losses), slippage and frictional losses (mechanical power). EC motor have no slippage losses, reducing losses and increasing efficiency.
By comparing 2 backward curved centrifugal impellers, one in AC and the other in EC.
Please note that all request a quote submissions will be contacted by one of our product engineers to ensure correct fan selection and to take additional details. This will be used to determine the correct fan for the project
Let’s assume a laminar flow workstation requiring 13200m³/h at 450Pa. This requires 4 off Ø315 backward curved fans. Now let us assume that this workstation operates for 50 weeks of the year and for 8 hours per day at full speed. During non working hours to maintain the work area, the fans are run at roughly half the airflow.
Let’s compare the power consumed :
EC fans from manufacturer Ecofit
EC fans from manufacturer Rosenberg