Induction motors powering HVAC fans have data plates listing electrical specifications (kilowatts, amps); variable frequency drives (VFDs) or variable speed drives (VSDs) can control motor speed by changing the frequency (e.g., from 50/60 Hz down to 40 Hz), which reduces fan revolutions and volume of air delivered to the space.
factualpending
Evidence Quote
“You'll notice that this one [has] got Some vFDs on its and vSTS variable speed drives or variable frequency drive and they control the speed of the induction motor... if you change the frequency that it's operating at from 50 or 60 Hertz down to 40 Hertz maybe then you'll slow the revolutions of the induction motor down... You can change the flow the volume of flow volume of air into the space through these here”
Created: 8/13/2026, 4:57:53 AM
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