We are manufacturing new generation of frequency inverters with pure sine wave voltage output called NFO sinus inverter ( NFO Drives AB) - sweden
http://www.nfodrives.se/en/index.htm
Possible application :
- Fans , Blowers, centrifugal pumps, HVAC systems , heating, ventilation and air conditioning
- Elevators , conveyors ,hoists ,extruders , positive displacement pumps , mixers etc.
And where to use?
In : Hospitals, Hotels , Banks , radio/TV-stations, airports, laboratories, universities, etc.
Any application sensitive to electromagnetic interference (Navy ,Nuclear Power Station) or where long distance between motor & inverter (we use ONLY standard cables) is needed or where ball bearing currents are a problem or noise from switching PWM type frequency Converter in the drive system with AC motors.
References :
http://www.nfodrives.se/en/en_ref.shtml
More about problems & solutions in AC drives could be found on the following link:
http://taisirkhalil.blogspot.com/
Thanks to two registered patents, our product has the following advantages :
1-( patent) NFO Natural Field orientation
Motor gives full torque at all speeds, even stationary
You can never loose control over the motor
You can operate several motors from the same NFO Sinus frequency inverter
You can operate different motor sizes from the same NFO Sinus frequency inverter
Does not need a sensor on the motor
Very high dynamics with NFO
No difference between fan and pump operation - full torque always available when needed
2-( patent) NFO Sinus – Switch
Gives pure sine-wave motor current and voltage
No EMC interference
No sine wave, nor dv/dt filters needed
No inductances needed
No EMC cabinets,EMC enclosures
No shielded cables -use standard cables
No limit on cable length, apart from cable resistance
No earth current problems - can be operated with a residual current circuit breaker
No bearing currents
No switching noise in the motor
looking for partners world wide

Europe
industrial countries
worldwide

HVAC
Elevators