Variable Frequency Drives for Motors

Variable Frequency Drives for Motors

What are Variable Frequency Drives?

Variable Frequency Drives (VFD) is advanced microprocessor controlled programmable devices that convert the AC three-phase system with its constant voltage and frequency into a new three phase system with variable voltage and frequency.

The Variable Frequency Drive is suitable for any general-purpose application that involves a AC motor, has full of operation functions. Built-in variable digital/analog input functions to meet a wide variety of needs. RCO’s variable frequency inverter is easy to install and convenient to humanity operating features.


  • Energy Saving up to 30%.
  • Stabilize voltage
  • Motor Speed Control
  • Increased motor lifespan
  • Generator Rating Advantage
  • Low fuel consumption of Generator
  • Motor Protection.
  • Motor Torque control
  • 50/60Hz Operation
  • Any direction of Rotation


1. New Technology Super Low Noise
Innovative soft/hard ware. Optimum waveform. The motor as quiet as running with commercial power.
2. All Model Equipped With IPM
Employ IPM (intelligent power module) for power device. IPM provides numerous advantages such as quiet operation, high efficiency, high torque smoother shaft rotation and improved reliability.
3. Expansion Of Frequency Range
The range of variable frequency has been greatly extended from 0.5HZ-2400HZ. and S curve for smooth ACC/DEC. performance.
4. Upgrading V/F Characteristic
Provide constant torque curve (F1) reduce torque curve (F2) and (F3) for FAN/PUMP drive. Adjustable saving energy operation and wide basic voltage setting from 30HZ-2400HZ. Double V/F curve performance.
5. Enhanced I/O Function
Built-in variable digital/analog input functions and RS-485 communication to meet a wide of variety of needs, then our VFD is easy to install and convenient humanity operating features.
6. Compact Structure
RCO’s drive’s compact size design makes installation easier, it solves space limited problem.
7. Extended Braking Resistor Available
All series with extended braking resistor terminals. It makes machine more reliable in high frequency switching RUN/STOP or High speed/Low speed situation.
8. Cycle Timing Function
All series AC inverters are with cycle timing function for special purpose option.
Not only cost decrease but also use friendly for Timer model replacing general purpose AC drive with PLC.