All about VFDs
This 15-minute video, āVariable frequency drives explainedāVFD basics IGBT inverterā shows how they work in electrical engineering and power electronics. It demonstrates where and why to use a VFD or VSD, alternating current, direct-current, singlephase, three-phase, frequency, rectifier, DC bus, inverter, capacitor and pulse width modulation (PWM). Itās part of a series located here.
DoE improves performance
This 116-page article, āImproving motor and drive system performance: a sourcebook for industryā from the U.S. Dept. of Energyās Industrial Technologies Program (ITP), presents a system approach, indications of poor system design, motor types and operating characteristics, and shows how to match motors and drives to their applications.
Power for speed and torque
This 43-minute video, āIntroduction to motor drivesā by Jim Pytel of Big Bad Tech, covers power electronics devices that vary the speed and torque of a motor under its direction by varying the supplied voltage magnitude and frequency.It also reviews properties that influence synchronous speed, discusses rectification, inversion and filtration, and examines motor drive specifications and programming.
Design, validation testing
This online library, āAccelerate the design, validation and texting of motors and drivesā contains ebooks, whitepapers and case studies on testing motor and drive systems, developing premium efficiency motors, measurements challenges, AC kinetics and other topics.
AC basics and installation
This 38-minute video, āDrives 101: basic features of AC drives,ā shows how to control motors speeds, save energy and develop control strategies. It also covers pulse width modulation (PWM), constant torque loads, affinity laws for centrifugal loads, digital/analog inputs, slip compensation, braking methods and other topics.
Thereās also a link to a second, 27-minute video, āBest practices for installing AC drives,ā which has strategies, suggestions and technical advice.
Different drive types
This online article āTypes of motor drivesā covers DC and AC drives and the motors that rely on them, servomotor drives, controllers and applications, and stepper motors and applications.
Global Electronic Services Inc.
Troubleshoot drives, panels
This eight-minute video, āHow to troubleshoot and diagnose a non-working VFDā by Craig Hartman, presents a step-bystep guide for inspecting different parts of systems to diagnose non-working VFDs or VFD panels that arenāt powering up, showing error codes or running rough. It also shows how to check maximum frequency, set acceleration times, disconnect motors and measure cables.
A second, five-minute video, āHow to wire a VFDā by Steve Quist, provides instructions for wiring single-phase or three-phase Mitsubishi D700 series VFDs.
Three-phase inductive parts
This online article, āGet schooled: AC motor basicsā by Jeff Payne, covers the essential parts of three-phase AC inductive (asynchronous) and synchronous motors, namely the stator and rotor, as well as rotating magnetic fields, soft starters and VFDs, controls and common applications.
Soft starter vs. VFD
This seven-minute video, āWhatās the difference between a VFD and soft starter?,ā examines their internal workings and applications, so users can determine which they might want to implement. For example, it shows how aa typical, threephase soft starter uses six thyristors or silicon-controlled rectifiers oriented in an anti-parallel configuration to start electric motors smoothly.
