Premium Membership

Get the essence of electrical engineering in the form of specialized HV/MV/LV technical articles, electrical guides, and papers.

Danfoss guide

Facts Worth Knowing About Frequency Converters gives a simple introduction to the work and build-up of a frequency converter and the AC motors connected to it.

Facts Worth Knowing About Frequency Converters
Facts Worth Knowing About Frequency Converters (on photo: Danfoss VSD)

The basic elements are described in four main sections:

  • AC Motors
  • Frequency converters
  • Frequency converters and motors
  • Protection and safety when using frequency converters

CHAPTER 0: Introduction

  • Advantages of infinitely variable speed regulation
  • Control or regulation?

CHAPTER 1: 3-Phase AC Motors

  • Asynchronous motors
  • Stator
  • Magnetic field
  • Rotor
  • Slip, torque and speed
  • Efficiency and losses
  • Magnetic field
  • Equivalent circuit diagram
  • Speed change
  • Changing the number of poles
  • Slip control
  • Frequency regulation
  • Motor data
  • Types of load
  • Synchronous motors
  • Reluctance motors

See other Chapters

Control or regulation?

Many people use the terms control and regulation interchangeably. However, they do have precise definitions – largely as a result of developments in the field of automation.

The terms “control” and “regulation” depend on the type of plant. With speed “control” a signal which is expected to produce the required speed is sent to the motor. With speed “regulation” a feedback signal is given from the process.

If the speed does not correspond to the requirements, the signal to the motor is regulated automatically until the motor speed is as it should be.

Title:Fact Worth Knowing About Frequency Converters by Danfoss
Size:1.0 MB
Download:Right here | Get Download Updates | Get More With Premium Membership
Danfoss – Facts Worth Knowing About Frequency Converters
Danfoss – Facts Worth Knowing About Frequency Converters

Premium Membership

Get access to premium HV/MV/LV technical articles, electrical engineering guides, research studies and much more! It helps you to shape up your technical skills in your everyday life as an electrical engineer.
More Information


  1. Sivaprakasam K
    May 31, 2020

    Very useful information for Application Engineers

  2. Luis
    Jan 30, 2018

    ..thanks for sharing this tachnical information, very useful for my sons!

  3. Sumit kumar
    Jul 01, 2016

    The download link doesn’t work it lead us to a new page .. not even the search option show any search reasult .. i’m using chrome on android… plz tel me the solution..

  4. Panneer selvam R
    Jul 19, 2015

    The articles presented is very usefull and improves the the knowledge level appreciably which is needed for any practicing Engineer.

  5. RERA
    Aug 31, 2011


  6. RERA
    Aug 31, 2011

    so good!!

Leave a Comment

Tell us what you're thinking... we care about your opinion!

Subscribe to Weekly Digest

Subscribe to free HV/MV/LV technical articles, electrical guides and papers.