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Interference Free Drive | NFO Sinus®

Supplier: Autech Control Group

NFO SinusĀ® Interference Free Drive - Variable speed drives using patented Swedish technology allowing the control of electric motor speeds whilst creating no electromagnetic interference, in turn offering a range of unique benefits.


Features include:

  • Sizes range from 0.37 to 45kW
  • No requirement for shielded cables or glands
  • Hassle free installation
  • Unlimited cable distance between motor and VSD
  • Free from electromagnetic interference
  • Quiet motor operation with no irritating switching noise
  • No induced bearing currents
  • Less than 2mA earth leakage (Type A RCD compatible)
  • Ideal for hospitals, data centres, agriculture and HVAC applications


Installation is easy and inexpensive as you do not need shielded cables, EMC filters or other EMC-classed installation accessories. When undertaking energy efficiency projects, you can make use of the existing cables, even if they are not shielded, thus making installation work quick and easy. The distance between the motor and the inverter can be long as the only thing limiting the length of the cable is its resistance. The inverter can thereby be located wherever you want it, even if the distance to the motor is several hundred metres. This offers new flexible solutions in difficult environments.


NFO Sinus® is interference-free and thereby does not subject any of the equipment in its vicinity to electromagnetic interference. The inverter satisfies the most stringent demands set out in the EMC directive and can be used in every kind of environment from industrial to residential. Moreover, the product meets the requirements set out in the EMC directive concerning medical products. With NFO Sinus® you also avoid all the disturbing switching noise in the motor, which results in a quieter environment.


NFO Sinus® does not generate any bearing currents. The motor therefore has a longer lifespan and NFO Drives offers a five-year warranty on the bearings in new motors. No earth leakage currents are generated, which means that residual current devices for both personal safety and fire prevention can be used. This provides a high level of electrical safety.


The motor speed can be very precisely controlled and with full torque right from stand-still as well as at a low speed. The inverter furthermore has an energy-save function that allows you to conserve even more energy when running with a low load on the motor, e.g., fans, which at times run at a low speed.

Facts and Figures

To date, 20 000 drives have been installed. The NFO patent (Natural Field Orientation) gives sensor less vector control with full torque from standstill NFO Sinus is the only frequency inverter on the market that generates a true sinus voltage which substantially reduces costs for our customers.

NFO SinusĀ® Interference Free Drive