Leading the Way with Energy Efficient EC Technology
Modern measuring systems are available in our own company laboratories. Here electrical, fluidic and circuitry related properties of our fans and air handling units can be measured and analyzed. Our testing chambers are regularly inspected and certified by TÜV Süd according to DIN EN ISO 5801. Through this an independent entity confirms the reliability and accuracy of the testing equipment used and hereby confirms the precision and performance data of our products.
Advantages of EC Technology
Our engineers and technicians are constantly working on improving the energy efficiency of our products – with success. Our motors with modern EC-technology achieve efficiency ratings over 90% and save up to 50% energy versus traditional motor technology. In comparison to EC 60034-30, Rosenberg EC-motors have an efficiency rating greater than IE4. The lower energy consumption is not only good for the environment, but lowers the operating costs for our customers.
The EC-technology offers more than just efficiency. Rosenberg EC-motors are maintenance free and low-noise. In addition, the integrated, intelligent electronics take care of control, communication and monitoring functions. Steplessly variable speed settings are possible as well as the creation of pressure, air flow and air quality parameters. Parameters essential to the proper operation, i.e. voltage or temperature, are monitored automatically. With this, our EC-products meet the highest standards in regards to energy efficiency, cost effectiveness and high air quality.
Quality pays for itself. The slightly higher investment costs compared to conventional motors is usually amortized within a short operating time due to lower energy consumption und greater ease of installation (no transformer controller, motor overload switch, thermocouple meter, VFD, or phase angle controller are necessary).
The Rosenberg EC-Motor
The Rosenberg EC-motor (EC = Electronically Commutated) is an inverter-fed synchronous motor with permanent magnets in external rotor construction.
The motor position is dependent upon voltage supplied via an inverter module (similar to the principle of a frequency inverter). The EC commutation electronics are different from a frequency inverter in that they decide how the motor phases in the stator are supplied with current (commutation) depending on position, rotation direction and default. Permanent magnets in the rotor produce a magnetic field which is required for full load production. A high efficiency, low noise, and continuous motor speed control is possible with this. An assembly flange on the rotor is used for impeller assembly. Depending on the motor type, a terminal box is avaible with cable screw connections or connection cable for easy and quick connection.
Depending on the application area is possible to adopt further control functions (e.g. constant pressure control, volume flow control, temperature control, air quality control)
Fans with EC-Drives
Rosenberg offers a plethora of energy efficient fans with EC-drives in the area of standard fans, fans for OEM-applications, and fans for use in ventilation units. EC-fans are utilized everywhere where economical energy usage and simple control are required based on the actual ventilation needs. The integrated electronics sets the EC-fan for optimal operation every time. All that is needed is a control signal.
In operating mode “open loop “the speed of the fan can be sleeplessly adjusted through a 0-10 V or 4-20 mA set point input. EC-fans with integrated electronics are speed controllable 0...100% of the nominal speed.
In operating mode “closed loop “the EC-fan compares the nominal value with the measured actual value and adjusts the speed accordingly to the set requirements. The measured values (pressure, air flow volume, temperature, CO2 …) must be present as an electrical signal 0-10 V or 4-20 mA.
In operating mode “bus “the EC-fan can be integrated into a bus system through an RS-485 interface.
With the free Rosenberg software ECParam, changes to settings of the EC-fan can be made using a USB-to-RS485 adapter. Current operating conditions can also be read-out (Changing the operating mode, setting a specific minimum or maximum speed, and much more)
The following fan types are available with EC-drives:
Furthermore, due to their outstanding properties, EC-fans are generally used in our energy recovery units. Depending on the air volume and application our Airbox air handling units are also equipped with energy efficient EC-fans.
Rosenberg EC-fans have high energy saving potential under full load and especially under partial load. The efficiency losses are significantly lower than with conventional AC-motors at the same air flow. The improved energy efficiency results in fewer CO2 emissions. In addition, there are lower investment costs for speed control of the fan. A control transformer, VFD or phase angle controller are not necessary. All necessary components are already contained in the EC-motor electronics. Modern EC-technology from Rosenberg is not only easy on the wallet, but also on the environment.
Representative calculation examples:
Energy saving potential of EC Centrifugal fans, Size 560