What is EC technology?
EC stands for Electronically Commutated and it combines AC and DC voltages, 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.
EC Motor Principle
Permanent-magnet brushless DC motor within the rotor
The stator is driven by electronic switches (which replace the Carbon brushes), controlled by a microcontroller.
Electronic system (hall effect sensor or software is used to recognize the rotor position)
AC operated (230Volts Single phase or 380/480Volts 3phase, 50/60Hz)
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.
The EC fan can rotate at a higher speed (2950rpm) than the AC (2750rpm) with a smaller motor than the AC fan.
The data for the AC fan is the consumed fan power and excludes losses from any inverter or controller necessary to control the fan.
The EC fan does not require any inverter or speed controller
Constant pressure : Used in conjunction with a pressure sensor, the fan maintains the same pressure at varying airflow. Operates with forward curved centrifugal fans without pressure sensor and with backward curved motorised impellers with pressure sensor.
Constant airflow : The fan maintains the same airflow at varying pressure (ideal for filtered applications).
0-10VDC / PWM output : EC motors can be controlled by a simple, standard 10kOhms potentiometer on the integrated 0-10VDC output.
Hall effect : A tachometric output is available, which can be used for an optional alarm relay.
Pressure control : A pressure sensor can be connected directly to the Electronic of the EC motor. The pressure control is made by the integrated electronics. No additional control unit is needed.
Master/Slave : This system is used when several fans are used together within a single application. The main fan (Master) is individually pressure controlled. The other fans (slaves) are then speed controlled by the Master fan : Slave Fans are always at the speed of the master fan.
Energy savings : Minimum power consumption & better efficiency than AC equivalent.
Control : 100% speed controllable, not frequency dependant. Can be set-up for constant airflow or constant pressure applications, 0-10VDC or PWM control signal.
Low motor temperature : for longer lifetime than AC equivalent
Simplicity : Electronic & power transformation are completely integrated within the motor.
High performance : Speed can be driven up to 3600rpm, one EC fan replace multiple type of motors (2, 4 and 6 pole)
Easy connection : No complicated wiring and set-up with a Frequency Controller, EC fans have very little configuration.
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