The EC-motor (EC = Electronically Commutated) is an inverter-fed synchronous motor with permanent magnets in external rotor construction. The motor position is dependent upon voltage supplied via an inverter module (similar to the principle of a frequency inverter). The EC commutation electronics are different from a frequency inverter in that they decide how the motor phases in the stator are supplied with current (commutation) depending on position, rotation direction and default.

Permanent magnets in the rotor produce a magnetic field which is required for full load production. A high efficiency, low noise, and continuous motor speed control is possible with this. An assembly flange on the rotor is used for impeller assembly. Depending on the motor type, a terminal box is available with cable screw connections or connection cable for easy and quick connection. Depending on the application area is possible to adopt further control functions (e.g., constant pressure control, volume flow control, temperature control, air quality control)