What is EC?

EC (Electronic Commutation) refers to intelligent electronic motor control. A comparison with the outdated technology of AC motors will help to illustrate the benefits of EC technology. 

Conventional AC motors (alternating current) have a basic disadvantage due to the mains frequency of the current. When it is fed in, the electric current changes its direction 100 times a second, meaning that a magnetic field also builds up 100 times a second. 

  • This magnetic field is needed to transfer power to the moving component of the motor (rotor). 
  • The “reversal of polarity”, in technical terms “the iron losses of the iron core of the motor”, costs energy. 

Intelligent EC motors (Electronic Commutation), in turn, are direct current motors.

  • The direction of rotation of the rotor is not produced by a reversal of the current direction, but by the intelligent switching of the motor winding strands. 
  • There are no “energy-consuming iron losses” in the drive here, instead the pulsing of the direct current provides control of the rotor speed actually needed.

Unlike with conventional AC motors, the electronics monitors the EC motor at any given operating point and adjusts the commutation rate ideal for each speed and pressure range.

This means that the speed of EC motors can be controlled extremely well, and the motors also operate very efficiently in the partial load range. No external speed controllers are needed. The technology can be very simply integrated into IoT strategies using Modbus communication.