Logo Sentera
Sentera – your partner in HVAC control solutions
Search
Allow us to inform you
Leave us your contact data so that we can communicate with you.

Close

What is the difference between an AC and EC motor?

Motor and fan related questions
A motor which is referred to as ‘AC motor’ has a stator winding. The AC power supplied to the motor stator creates a magnetic field that rotates in time with the AC oscillations. This magnetic field is used to generate the motor torque. AC motors (and certainly induction motors) are relatively cheap and have a simple construction, compared to DC motors. At the other hand, DC motors offer a very high energy efficiency.

Brushless DC motors are also known as EC motors (or Electronically Commutated motors). They are synchronous DC motors, powered by a DC electric source via an integrated fan speed controller which produces an AC electric signal to drive the motor. The integrated controller uses a DC current switched on and off at high frequency for voltage modulation and passes it through three or more non-adjacent windings. Because the controller must direct the rotor rotation, the controller requires some means of determining the rotor's orientation/position (relative to the stator coils). Some designs use Hall effect sensors or a rotary encoder to directly measure the rotor's position.

An EC motor can be seen as an AC motor with integrated fan speed controller. This means that an EC motor requires an indication of the desired fan speed or a fan speed setpoint. Many EC motors can be controlled via an analogue 0-10 VDC or PWM signal. More and more EC motors feature Modbus RTU communication. The advantage is that they cannot only be controlled via Modbus RTU, but all the motor parameters (Rpm, consumed power, motor status, motor temperature, etc.) are also available via Modbus RTU.



Recent news
Date 16/07/2021
Indoor Air Quality in hospitals
Indoor Air Quality in hospitals Why is air quality in hospitals so important? A hospital is a place where both weak and healthy people come into close contact with each other. In Corona times, that is a frightening scenario that requires many precautions to make this possible in safe conditions. Monitoring indoor air quality is one of these precautions. >>>
Date 25/05/2021
CO2 monitoring in schools
CO2 monitoring in schools Sentera CO2 meters help to reduce the spread of the COVID-19 virus in this school in Sint-Niklaas, Belgium. >>>
Date 16/03/2021
CO2 monitoring system to reduce the risk of COVID-19 contamination
CO2 monitoring system to reduce the risk of COVID-19 contamination Fresh indoor air reduces the risk of COVID-19 contaminations. Sentera HVAC sensors check whether there is sufficient fresh air supply. The measurements can be visualised via a 5-inch touchscreen. >>>