EC fans / EC motors


Fans with EC-drives, no matter if from ebmpapst, Ziehl Abegg, Nicotra||Gebhardt or Rosenberg, show highest efficiencies especially in partial load range.

Especially in the HVAC applications this is immensely important, where the electronic drives being used very often in partial load operation exclusively.

Total energy savings up to 50% are not rarely compared to concepts with classical drives.


An EC-drives consists of an EC-Motors where permanent magnets create the required radial magnetic field inside the motor and an EC-controller a sort of frequency inverter that creates the current for the motor in a proper manner.

Especially EC-fans in the HVAC business are integrated that means that motor and controller belong to only one single unit.


The drive control of the EC-motor is done by the EC-controller automatically. The user just needs to ensure a set-point is supplied according his requirements.

This could be a simple analogue 0 ... 10V signal or a special BUS-signal created by a special control device as uniquom or uniqunet. Usually RS485-based systems are used as ebmBUS, Modbus or GBus.


Infographic - Advantages EC-fans / EC-motors

EC motor

Functionality EC motor

EC-motors are according to its name electric commutated motors. The control of the stator winding system is done in accordance to the exact position of the permanent-magnet rotor. The position of the rotor is mainly measured by little hall sensors placed in the EC-motor in rotational sense or is calculated using a special mathematical model. In both variations an electronic drive control of the EC-Motor called EC-controllers is indispensable.

Video - EC motor.

Stator EC-Motor

Stator eines EC-Motors einer FFU - Nicotra||Gebhardt

Rotor EC-Motor

Rotor eines EC-Motors (ebmpapst) in einer FFU-Anlage

Application for EC fans

EC fans are applied in a wide range of HVAC units, especially in speed controlled systems, where high efficiency and noise reduction matters.

It can be for the control of FFUs or FANWALLs, it can be for Condensers and Evaporators or as classical Exhaust- and Supply Air fans.

Fan Filter Units

Wärmetauscher mit EC-Lüfter von ebmpapst

Testumgebung FFUs

FFU with Green Tech Fan from ebmpapst

FFU with Green Tech Fan from ebmpapst and our control device uniquom




For our customers we design different diagnostic and control devices for EC-drive market. This includes drive controllers incl. COM-interfaces (analogue, Modbus rtu as well as other, even proprietary, RS485 systems).

Furthermore we plan whole concepts for electric drives (asynchronous and synchronous) especially for fans as well as special applications.


We help our customer at the design, the data management and the project programming of FFU appliances. Furthermore we would like to support you while the commissioning of new cleanroom appliances or extensions and perform on demand an error diagnostic with our own designed tools (i.e. uniquom / uniqunet ) including a final troubleshooting.

Our Projects - EC Technology

Handheld to control and parametrize EC-fans

On of the leading HVAC distributors and contractors in Israel uses, by its own account, mainly EC-fans from ebmpapst and Ziehl Abegg for his appliances.

uniquom - Handheld to control and parametrize EC-fans

From now he will program and control it's EC-fans with Modbus- Interface by technologies out of the Vogtland. With that the handhelds of the unqiuom series will be used at 24 countries worldwide.

FFU Service - Fraunhofer Gesellschaft

With its various institutes Fraunhofer Gesellschaft belongs to the greatest Cleanroom Operators in Germany.

Yesterday a production shutdown was planned in a job-side in northern Germany, used by different companies to perform their annual maintenance. So the FFU System, delivered with EC-fans from Nicotra||Gebhardt and commissioned by vbk technology in 2013 was checked was well.

Service uniqunet – FFUs in Cleanroomapplication

„Troubleshooting - Commissioning - Training“ were written at the P.O. of a big plant engineering company. They pleased us for support for commissioning a FFU-network with fans from ebmpapst with Modbus Interface at site and to train the operating staff afterwards.

After an address-conflict was eliminated in the FFU-network and no other abnormalities were found we did the programming of the uniqunet FFU-control device together with the end user. Now 3 FFU groups will be controlled according to the manufacturing process with different set-values in day/night mode.

Service Cleanroomapplication

Service uniqunet – FFUs in Cleanroomapplication

Lounges - uniqunet control device supports NICOTRA Gebhardt FFU

After a few years of absence the Cleanroom Lounges took place in Karlsruhe this year again. Personal highlight for me was the operation of a of an uniqunet control device driving an EC-fan of a NICOTRA Gebhardt ( former Gebhardt Ventilatoren ) FFU.

NICOTRA Gebhardt has been an OEM costumer for our control devices for years.

Uniqunet with Gebhardt FFU

uniqunet control device supports NICOTRA Gebhardt FFU

control devices for fans


A modern hand device to control and to parametrize several devices with RS485 interfaces.

uniquom® - get more information uniquom Downloads and information uniquom


Stand-alone Monitoring and Control device for different applications with RS 485-based interfaces.

uniqunet - get more information uniqunet Downloads and informationen uniqunet