SINE WAVE FILTERS
PROTECT THE MOTOR AGAINST EXCESSIVE VOLTAGE SPIKES AND OVERHEATING
 
Sine wave filters are low pass frequency filters, which convert the rectangular PWM output signal of motor drives into a smooth sine wave voltage with low residual ripple.
Sine wave filters, alternatively called output filters or sinusoidal filters, are mainly used in combination with variable speed drives (VSD) to protect the motor against excessive voltage spikes and overheating. These filters also decrease acoustic switching noise levels and enable longer cable layouts. As a consequence, insulation stress and losses in AC motors are reduced, and therefore prolonging the motor life time.