TORMACH PCNC 440 Whine
System Nominal
The audible whine is a result of magnetostriction caused by the Pulse Width Modulation (PWM) carrier frequency. As the inverter switches the DC bus voltage to simulate an AC sine wave, the magnetic fields created in the inductors and motor windings cause physical expansion and contraction at the switching frequency, which is audible to humans. This is a standard engineering byproduct of VFD-driven systems.
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