Harmonic & SineWave Filters for VFDs
For variable frequency drives (VFDs), filters are essential components. They greatly contribute to the VFD's and connected motor's reliability, performance, and service life. These devices address problems like electromagnetic interference (EMI), harmonic distortion, and voltage spikes that can affect not only the drive but also surrounding equipment.
Harmonics are unwanted components that degrade the electrical waveform—the very thing we think of as "electrical power"—and they can cause all sorts of problems, from overheating transformers and motors to making sensitive equipment malfunction. A must-have for any VFD is a harmonics filter: an electrical component that keeps the VFD away from its neighbors and makes the whole system work more efficiently. Harmonic filters do the opposite of what harmonics do: they make certain frequencies go away, which keeps the power clean.
The sine wave filter is a conversion device that takes the pulse-width modulated (PWM) output from variable frequency drives (VFDs), and with it, gives rise to a sinusoidal waveform. This type of filtered output is necessary to ensure not only reliable but also efficient operation of electric motors—particularly those with long cables or in applications where the motor's sensitive components are prone to frequencies deemed undesirable.
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