SOURCE-LED REFERENCE NOTES

Variable Frequency Drive (VFD) Energy Savings & Motor Thermal Derating

Evaluating simple financial payback period for VFD retrofits on centrifugal pumps and fans, dv/dt output filtering, and motor insulation derating.

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Variable Frequency Drive (VFD) Energy Savings & Motor Thermal Derating

Source notes — linked publications and standards below; organisations and authors named there do not author or endorse this page.

1. VFD Energy Savings Payback

Annual Savings ($) = (P_std - P_vfd) × Operating Hours × Tariff. Payback Yrs = VFD CAPEX / Annual Savings.
PEER-REVIEWED TEXTBOOK & JOURNAL CITATIONS
  • NEMA. (2021). NEMA MG-1 Motors and Generators Standard (Part 31: Inverter-Fed Motors). [Access Reference]