Highly efficient electronic commutation motor technology incorporated into a Fantech fan is helping the building services industry meet increasing demands for energy efficient products.
An electronic commutation motor uses electronics to periodically reverse the current direction between the rotor and the external circuit so that a DC motor can be plugged into a standard 240V supply. As the electronics control the ramp up speed, in-rush current is kept to a minimum which means that the fan never draws more than the rated full load amps.
It is the combination of a highly efficient DC motor and on-board speed control, however, that reduces noise and leads to significant power savings. As an example, by running electronic commutation fans at half speed, power consumption is reduced by nearly 87.5% and noise levels are 16dB lower.
The sophisticated electronics of the electronic commutation motor respond to 4 to 20mA or 0 to 10v signals, which means it can be factory programmed to work with a wide range of sensors, such as temperature, air pressure, air volume, air velocity, humidity, CO, and CO2. The signal will then speed up or slow down the fan according to its requirements.
Fans with electronic commutation motors can also be controlled using a Building Management System.
Fantech has recently added extra functionality to the electronic commutation range by including a unique controller known as the demand control ventilation system. This controller uses the feedback from sensors to automatically control the amount of ventilation required. This intelligent system features preset parameters for each of the sensors in typical applications, which reduces the need for installers to have specialised control knowledge.
A school classroom is a good example of where a demand control ventilation system can be used in conjunction with a CO2 sensor. When the room is empty and the CO2 level is at 500ppm, the demand control ventilation system has been set to run the fan at 20% speed. As the room fills with students and the CO2 level increases to 1500ppm the fan will run at 100% speed. The ability for this fan to run at full speed only when required can dramatically decrease energy consumption.
Savings can also be made with installation. The electronic commutation product has many of the filters and protection mechanisms needed to ensure the fan is working properly already built in, meaning there are no contactors, current overloads, Star or Delta connections, motor over-temp devices, shielded cables, or EMF, RFI, EMC and line filters.
So installation of electronic commutation motors is fast and easy with less wiring/cabling and significantly less labour. Once installed the DC brushless motor operates much cooler than an AC motor, extending the bearing life and overall longevity of the motor.
Fantech utilise EC technology in a number of their product ranges, such as the PowerLine EC series of in-line centrifugal fans and the roof-mounted Gamma EC and GL Gamma series.
The PowerLine EC is also available with the DCV system.