A Variable Frequency Drive (VFD) is an electronic device used to control the speed and torque of an AC motor by adjusting the frequency and voltage of the power supplied to it. In simple terms, it lets you make an electric motor run faster or slower depending on the requirement. This makes machines more efficient, saves energy, and reduces mechanical wear. VFDs are widely used in applications like pumps, fans, conveyors, compressors, and HVAC systems where variable speed control is needed.
Inside a VFD, the incoming AC power is first converted to DC and then inverted back to AC with a variable frequency. By changing this frequency, the VFD precisely controls the motor speed. It also provides soft start, braking, and overload protection. In short, a Variable Frequency Drive gives complete control over motor operation, helping industries achieve better performance, energy savings, and longer equipment life.