Ideal for the movement of air and non-aggressive gas and vapours.
Air Handling Units (AHU), hygienic units, and clean room filter units.
Cooling of electrical motors and generators (e.g., in wind parks), ventilation of switch cabinets, air conditioning (e.g., in trains).
The following design models are available:
Sizes Available: 180-400 mm / 7.09-15.75”
The casings of the high-efficiency centrifugal fans are made of galvanized sheet metal.
The side parts are produced with nut sets to fix the mounting brackets, which can be fixed in steps of 90°.
Epoxy coating is available upon request.
ECOFIT series: black-painted steel or plastic scroll.
The impellers with 38-42 forward-curved blades are made of galvanized sheet metal.
They are mounted directly to the external rotor motor.
ECOFIT series: galvanized steel or plastic impeller.
The impellers are statically and dynamically balanced together with the external rotor motor according to quality level G2,5 DIN ISO 1940.
Direction of rotation for fan types ERA is clockwise when viewed from the inlet side, but for fan types DRA, it is anticlockwise viewed from the cable outlet.
Caution: Low air volume at wrong direction of spin!
ECOFIT series: direction of rotation is indicated in the catalogue on each datasheet.
Rosenberg external rotor motors are manufactured in protection class IP54.
ECOFIT external rotor motors are manufactured in protection class IP44 or IP54 for GDF.
The winding insulation corresponds to insulation Class F (UL-approved).
Bearings are deep groove ball type in sealed housing. Special grease lubrication provides maintenance-free operation, low noise, and extended life.
ECOFIT series: ball bearings closed on both sides are used. Special grease lubrication provides maintenance-free operation, low noise, and extended life.
All motors are equipped with thermal contacts, wired inseries. Thermal contacts are temperature-dependent control elements, sensing the winding temperature of the motor. These contacts protect the motor windings from overload, failure of a mains phase, standstill of the motor, and from too high temperatures of the medium to be ventilated.
In addition to the mounted thermal contacts, we recommend the use of our motor protection control units.
Rosenberg also offers five-step speed controllers, RTE and RTD.
Motors are equipped with the motor protection in connection with thermal contacts. An additional motor protection switch is not required.
Speed control can be provided for fans that demand optimal adjustment of the operation point.
Speed control is obtained by “Voltage Control” and “Frequency Control”, as described below.
Voltage control: The speed control is provided by reduction of the terminal voltage. If the voltage is reduced, the speed of the motor decreases, and the air volume flow sinks in proportion with the speed. The matching voltage controllers can be provided on request.
Frequency control: All voltage-controllable fans for three-phase power supplies can also be speed controlled by frequency converter from 60Hz downwards. The speed control is realized by reduction of the power supply frequency. At higher frequencies than 60Hz, the motor will be thermally overloaded.
With operation of the motors on a frequency controller, the maximum speed of voltage increase of 500V /μs must not be exceeded. According to the frequency converter type and the length of the cable between motor and frequency converter, additional components must be planned. Please refer to the operation manual of the frequency converter.
Ideal for the movement of air and non-aggressive gas and vapours.
Air Handling Units (AHU), hygienic units, and clean room filter units.
Cooling of electrical motors and generators (e.g., in wind parks), ventilation of switch cabinets, air conditioning (e.g., in trains).
The following design models are available:
Sizes Available: 180-400 mm / 7.09-15.75”
The casings of the high-efficiency centrifugal fans are made of galvanized sheet metal.
The side parts are produced with nut sets to fix the mounting brackets, which can be fixed in steps of 90°.
Epoxy coating is available upon request.
ECOFIT series: black-painted steel or plastic scroll.
The impellers with 38-42 forward-curved blades are made of galvanized sheet metal.
They are mounted directly to the external rotor motor.
ECOFIT series: galvanized steel or plastic impeller.
The impellers are statically and dynamically balanced together with the external rotor motor according to quality level G2,5 DIN ISO 1940.
Direction of rotation for fan types ERA is clockwise when viewed from the inlet side, but for fan types DRA, it is anticlockwise viewed from the cable outlet.
Caution: Low air volume at wrong direction of spin!
ECOFIT series: direction of rotation is indicated in the catalogue on each datasheet.
Rosenberg external rotor motors are manufactured in protection class IP54.
ECOFIT external rotor motors are manufactured in protection class IP44 or IP54 for GDF.
The winding insulation corresponds to insulation Class F (UL-approved).
Bearings are deep groove ball type in sealed housing. Special grease lubrication provides maintenance-free operation, low noise, and extended life.
ECOFIT series: ball bearings closed on both sides are used. Special grease lubrication provides maintenance-free operation, low noise, and extended life.
All motors are equipped with thermal contacts, wired inseries. Thermal contacts are temperature-dependent control elements, sensing the winding temperature of the motor. These contacts protect the motor windings from overload, failure of a mains phase, standstill of the motor, and from too high temperatures of the medium to be ventilated.
In addition to the mounted thermal contacts, we recommend the use of our motor protection control units.
Rosenberg also offers five-step speed controllers, RTE and RTD.
Motors are equipped with the motor protection in connection with thermal contacts. An additional motor protection switch is not required.
Speed control can be provided for fans that demand optimal adjustment of the operation point.
Speed control is obtained by “Voltage Control” and “Frequency Control”, as described below.
Voltage control: The speed control is provided by reduction of the terminal voltage. If the voltage is reduced, the speed of the motor decreases, and the air volume flow sinks in proportion with the speed. The matching voltage controllers can be provided on request.
Frequency control: All voltage-controllable fans for three-phase power supplies can also be speed controlled by frequency converter from 60Hz downwards. The speed control is realized by reduction of the power supply frequency. At higher frequencies than 60Hz, the motor will be thermally overloaded.
With operation of the motors on a frequency controller, the maximum speed of voltage increase of 500V /μs must not be exceeded. According to the frequency converter type and the length of the cable between motor and frequency converter, additional components must be planned. Please refer to the operation manual of the frequency converter.
EC (Electronically Commuted or Electronically Controlled) motors are electric motors which have permanent magnets on the rotor and use electronics to control the voltage and current applied to the motor.
EC motors have no brushes, so they avoid the sparking and short life of brushed motors. Because they have electronics controlling the stator and do not need to waste power inducing the rotor field, they give better performance and controllability and run cooler than induction motors (for small motors, at least; high horsepower 3 phase induction motors can be very efficient). EC motors are used today in many fractional-horsepower applications where high motor efficiency, reliability, and/or controllability are desired.
EC motors are very high efficiency and maintain a high efficiency level even at part speed. This means that in most cases, they use from less than one-third to one-half of the electricity needed by the traditional "shaded pole" induction motors used in the ventilation and refrigeration industries, which in turn translates into lower operating costs and short payback periods.
EC motors’ high efficiency also means that the motors run “cool” and dramatically reducethe amount of waste heat produced. Reduced waste heat at the evaporator motor level also typically results in reduced operation at the compressor level, which allows further energy savings. Further, running cooler improves the life of highly loaded motor parts like windings and bearings.
EC motors also have a wider operating range than traditional induction motors, which means that one ECM motor can replace several induction motor models. In this way, the number of models required by a typical customer is significantly decreased, which reduces and simplifies inventory. This is the main reason why ECM product lines usually include fewer motor models than their induction counterparts.
In terms of speed control and features, because the motor’s operation is controlled by software, EC motors allow customers to optimize and integrate the motor, fan, and controller with the application and to include features like data communications, constant volume control, variable speed, etc.
EC motors are also quieter than traditional inefficient motors, have longer design life, and require less maintenance.
