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Sine Wave Filters

Positioned between the variable frequency drive and the motor, sine wave filters provide a sinusoidal phase-to-phase motor voltage. They reduce motor insulation stress and switching acoustic noise from the motor. Bearing currents are also reduced, especially in larger motors.
In addition to protecting the motor, sine wave filters also provide protection for the drive, because the lower pulse load is reflected in lower semiconductor losses.
  • Greater motor longevity through lower dV/dt stress
  • Lower frequency-dependent losses in the motor, eddy current losses and stray flux losses
  • Lower acoustic switching noise on the motor
  • Reduced semiconductor losses in the drive when using longer motor cables
  • Less EMI on unshielded motor cables
  • Reduced voltage peaks
  • Reduced electrical discharges in the motor, prolonging bearing life
  • Prevent flashover in motor windings