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
