Rosenberg Radial Fans with free-running impeller type E/DKHR form a compact and constructively optimal fan unit by combining an external rotor motor and a backward-curved impeller. During development of the backward-curved impeller, Rosenberg attached great importance to high efficiency and at the same time to optimizing the sound level. Fans of this construction are designed for installation in appliances such as air handling units, hygienic units, clean room filter units, and air conditioning units. The fans are for clean air application and ventilation of non-aggressive vapours and fumes.
The direction of rotation of the impeller when viewed from the inlet side is clockwise. The wrong direction of rotation can overload the motor. It is essential to check the direction of rotation prior to operation.
The inlet cones are made of galvanized steel. They are fluidic optimized to supply a good airflow towards the impeller. The optimal immersion depth of the impeller is described on each dimensional sheet.
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, locking 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 voltage controls, RTE, and RTD types. When using these controllers, an additional motor protection switch is not required.
Rosenberg Radial Fans with free-running impeller type E/DKHR form a compact and constructively optimal fan unit by combining an external rotor motor and a backward-curved impeller. During development of the backward-curved impeller, Rosenberg attached great importance to high efficiency and at the same time to optimizing the sound level. Fans of this construction are designed for installation in appliances such as air handling units, hygienic units, clean room filter units, and air conditioning units. The fans are for clean air application and ventilation of non-aggressive vapours and fumes.
The direction of rotation of the impeller when viewed from the inlet side is clockwise. The wrong direction of rotation can overload the motor. It is essential to check the direction of rotation prior to operation.
The inlet cones are made of galvanized steel. They are fluidic optimized to supply a good airflow towards the impeller. The optimal immersion depth of the impeller is described on each dimensional sheet.
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, locking 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 voltage controls, RTE, and RTD types. When using these controllers, an additional motor protection switch is not required.
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.
