Comparison between EC fans and ordinary fans

Working Principle

When the motor drives the fan spindle mounted on the bearing through the belt wheel, the impeller will rotate at a high speed (the impeller is mounted on the fan spindle through the hub with a key), and push the air through the blades, so that the air obtains a certain amount of energy and flows around the center of the impeller. When the gas passes through the worm case, due to the gradual increase in volume, part of the kinetic energy is converted into pressure energy, and then enters the pipeline from the exhaust port. When the impeller rotates, the center of the impeller forms a certain vacuum, and the air at the suction port is pressurized by the pressure fan under atmospheric pressure. In this way, with the continuous rotation of the impeller, the air that is constantly being inhaled and discharged to complete the task of air supply. The main difference is that one kind of EC fan, using pulse width modulation speed regulation, can realize the infinitely variable speed regulation, the internal controller can be adjusted according to the surrounding ambient temperature of its speed; the other is a variable voltage speed regulation, by changing the supply voltage to adjust the speed, can only be a few gears.

Advantages

EC fans: EC fans are easy to operate, make little noise, and have efficient speed control. All of the EC fan’s electronic equipment is embedded inside the fan, making the use of other components more efficient. The EC external rotor motor is used and is small in size.
AC fans: Inexpensive, stable and reliable.

Disadvantages

EC fans: High price, narrow range of air pressure adjustment, inconvenient maintenance.
AC fans: Complicated manufacturing process, high noise, low efficiency and inconvenient speed regulation.

Comparison of energy efficiency

Compared with traditional AC motors, EC fans make more efficient use of other components, and energy consumption is significantly reduced during low-load operation. EC fans use only 1/3 of the power used by industry-standard fans, with an energy-saving efficiency of more than 50%.