Free-blowing fans with EC external rotor motor and integrated power electronics
Rosenberg radial fans of the ranges GKHR and GKHM with free-running impeller are very compact units.
With respect to the air movement, the fans have an optimum design.
They combine an electronically commutated external rotor motor with newly designed integrated power electronics.
Using this design concept for the drive, a very compact unit was achieved, in which the controller and the motor are no longer separate.
Both power supply and control leads are connected directly to the motor.
The combination of the integrated power electronics motor together with the flexible production of impellers and efficient sheet metal handling makes it possible to manufacture fan modules for various applications. Constructive demands of the customer can be met.
The fan modules can be provided as:
GKHR: Motorized impeller (mounted and balanced) with or without inlet cone (loose)
GKHM: Fan module
GKHS: Fan module, known as “Spider” construction
GKHB: Fan module with a mounting stand
Due to the external rotor design, the EC motor with its compact design and high-power density is the logical choice for use inventilation and air conditioning applications. The EC-Motor combines the maintenance-free operation of asynchronous machines with the efficiency control advantages of a direct current motor, especially at low speeds.
- Major efficiency advantages during operation in all situations.
- The motor construction size can be reduced due to the EC Motor’s high performance, which minimizes the losses that result from motor blockage with direct driven fans.
- Less additional heat generation, which reduces the required cooling performance of the air handling unit.
- The maximum speed is independent of the power frequency.
- The construction of the external rotor motor remains compact.
Both power supply and control leads are connected directly at the motor so that no shielded cable needs to be used.
The motor can be speed controlled quite simply, with the use of an external potentiometer (accessory) or by an external 0-10 V/ PWM signal.
The efficiencies and power consumptions mentioned always relate to the complete system, including all losses caused by the impeller motor and the commutation unit.
The fans of the GKH_ range are suitable for air and other non-aggressive gases or vapours. The maximum temperature of the medium is 40°C. The increase in air temperature of the fan and surrounding temperature of the electronicsis made possible by reducing rotation speed.
Free-blowing fans with EC external rotor motor and integrated power electronics
Rosenberg radial fans of the ranges GKHR and GKHM with free-running impeller are very compact units.
With respect to the air movement, the fans have an optimum design.
They combine an electronically commutated external rotor motor with newly designed integrated power electronics.
Using this design concept for the drive, a very compact unit was achieved, in which the controller and the motor are no longer separate.
Both power supply and control leads are connected directly to the motor.
The combination of the integrated power electronics motor together with the flexible production of impellers and efficient sheet metal handling makes it possible to manufacture fan modules for various applications. Constructive demands of the customer can be met.
The fan modules can be provided as:
GKHR: Motorized impeller (mounted and balanced) with or without inlet cone (loose)
GKHM: Fan module
GKHS: Fan module, known as “Spider” construction
GKHB: Fan module with a mounting stand
Due to the external rotor design, the EC motor with its compact design and high-power density is the logical choice for use inventilation and air conditioning applications. The EC-Motor combines the maintenance-free operation of asynchronous machines with the efficiency control advantages of a direct current motor, especially at low speeds.
- Major efficiency advantages during operation in all situations.
- The motor construction size can be reduced due to the EC Motor’s high performance, which minimizes the losses that result from motor blockage with direct driven fans.
- Less additional heat generation, which reduces the required cooling performance of the air handling unit.
- The maximum speed is independent of the power frequency.
- The construction of the external rotor motor remains compact.
Both power supply and control leads are connected directly at the motor so that no shielded cable needs to be used.
The motor can be speed controlled quite simply, with the use of an external potentiometer (accessory) or by an external 0-10 V/ PWM signal.
The efficiencies and power consumptions mentioned always relate to the complete system, including all losses caused by the impeller motor and the commutation unit.
The fans of the GKH_ range are suitable for air and other non-aggressive gases or vapours. The maximum temperature of the medium is 40°C. The increase in air temperature of the fan and surrounding temperature of the electronicsis made possible by reducing rotation speed.
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.
