Patented NEW Direct Drive Technology
Big Fan Motor
EMF Motor with its patented permanent magnet technology offers perfect solutions for Big Fans ( High Volume Low Speed - HVLS Fans ) where high torque-low speed is required. 
In conventional systems, asynchronous motor and gearbox are used together. EMF Motor gives the gearbox output torque and speed as direct drive. While the asynchronous and gearbox provide efficiency between 50-70 %, EMF Motor can do the same with 90 % efficiency.  
The environment friendly motors save about 30 % to 60 % of the energy compared to geared systems and pays back very shortly.
​Eliminate all problems by Big Fans with EMF Motor
  • Sensorless controlled by basic V/f converter
  • Quiet operation < 45 dB
  • Direct drive, no gearbox, no oil, no cooling
  • Stable operation at low speed
  • Wide voltage range ( 230 - 380 - 400 V )
  • High pole number ( 66 - 68 )
  • Lowest operating cost
  • No maintenance
  • Compact and symmetric design
  • Special bearing
  • 200 / 350 VAC motor voltage to avoid main fluctuations
  • 10 times more torque than the same Asyn motor size
CASE STUDY for Big Fan ( HVLS )

EMF Motor uses its 66 poled SQM100-100 torque motor which characteristics are 120 Nm at 65 rpm, 200 V and 4.7 A, for a 7-meter diameter and 6 blades HVLS fan. The motor is coupled directly to the propeller ( direct drive ), operating at a maximum speed of 50 rpm where the speed control is performed with the potentiometer.

At 10 rpm ( 5.5 Hz ), the 0.3 A current-driven motor runs at 8 Nm of torque, consuming 10 W of electricity at 75 % efficiency. At 40 rpm ( 22 Hz ), 73 Nm of torque consumes 370 W of energy with 85 % efficiency. If the fan is set to 50 rpm, it consumes 770 W electricity at 117 Nm and at 15 kHz switching frequency and only 43 dB noise level is achieved with 80 % efficiency.
Two HVLS fans are working in our factory for 3 years with the first day performance without any need of maintenance. Having used these fans, we observed the below mentioned advantages:
  • The moisture of the environment where the fans are installed has been reduced which brought comfortable and fresh air in humid place like Istanbul.
  • The airflow generated by fans maximized the body’s natural means of cooling making people far more comfortable.
  • This ceiling fans generated a smooth updraft which forced the warm air off the ceiling and down into the space keeping our staff warm
  • Last but not the least, we only 0,45 $ for daily energy consumption per fan. 
We produce the most efficient direct drive HVLS motors.
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Beside of having many advantages to the geared solution, the patented EMF Motor permanent magnet technology is quite different than the conventional direct drive motors.

Please contact us for mobile big fan applications.