A practical introduction to Variable Frequency Drives — how VFDs control motor speed by varying output frequency and voltage, key specifications, installation considerations, and the energy savings they provide.
A Variable Frequency Drive (VFD) — also called an adjustable-speed drive (ASD), variable-speed drive (VSD), or inverter — is an electronic power conversion device that controls the speed and torque of an AC induction motor by varying the frequency and voltage of the power supplied to the motor. By running a motor at the exact speed needed rather than full speed, VFDs deliver dramatic energy savings and improved process control.
Topics covered
SCADA/ICS System Architecture — Extended Practice Exam
✨ Premium ContentGo beyond the free practice questions with a full-length paid exam bank.
Industrial Controls Project — Start to Finish (Full Access)
✨ Premium ContentA structured, paid professional training program for this discipline.
PLC Programming, Wiring, Process Control & Instrumentation — Illustrated Guide (Full Access)
✨ Premium ContentA zoomable interactive reader — free preview, then unlock the full set.
SCADA Redundancy and Failover Design
✨ Premium ContentA paid interactive calculator or 3D simulator for this discipline — part of the All-Access Pass.
📬 Get new engineering guides in your inbox
New calculators, interactive readers, and reference guides — no spam, unsubscribe anytime.
Put this knowledge to work on your iPhone
Browse our full catalog of professional iOS apps — from electrical code tools to AI builders.
Browse All 95+ Apps