EC stands for Electronically Commutated which means the motor runs on a DC voltage, but with a normal AC supply. EC motors are more efficient than AC motors because they use permanent magnets rather than induce a secondary magnetic field in the rotor. With the EC motor assembly, more space is saved because of 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. But if DC Motor used in an AC application, the power needed converting AC to DC, have to using a bulky, inefficient transformer.
For more information about EC Technology, Feel free to contact GP MOTOR TECHNOLOGY CO., LTD