Variable Frequency Drives

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Variable Frequency Drives

Variable Frequency Drives 2017-05-03T15:15:51+00:00

On-Site Training | Program Summary | List of Seminar Topics – North America | Variable Frequency Drives

Course Number: SEM-E-2014

Length of Course: 2 hours – Several topics can be combined to provide up to an 8 hour seminar session

Seminar Location: This seminar is available for on-site training


In Variable Frequency Drives, you’ll learn …

Topics

  • What variable frequency drives (VFDs) are and what they do
  • How VFDs can save on operating and maintenance costs
  • Historical developments and advancements of VFDs and their relevance
  • Applications of VFDs in pumps, conveyors, process lines, etc.

Overview

Since the mid-1980s, solid state electronic devices have been used to make motor controllers with 60 cycle-per-second input power and variable voltage, variable frequency output. As with many new devices, there have been some reliability problems, but the technology has gotten better, so that variable frequency drives (VFDs) are now used in many places where DC speed control was once, almost exclusively, the means of motor speed control. Today’s devices not only eliminate most of the harmonics on the input side of the motor controllers, but they also make the power factor very close to unity, greatly increasing the efficiency of most modern devices.

This seminar explains the different ways to control the speed of alternating current (AC) motors. By their very nature, most AC motors are not easily speed controlled. But we will review some of the historical developments and advancements that have been made with VFDs and see how engineers have done things that were once deemed impossible. Some of the important lessons in this webinar include demonstrations and explanations for how VFDs convert 60 Hertz constant voltage power to variable voltage, variable frequency power; how a single phase voltage can be turned into a three phase voltage to run single phase motors; and how current harmonics cause voltage harmonics to appear.

Take away and learning objectives

This course teaches the following specific knowledge and skills:

  • A brief history of variable speed drives and the reasons that variable speed motors are useful
  • How VFDs convert 60 Hertz constant voltage power to variable voltage, variable frequency power
  • The block diagram of VFDs and how the various blocks work
  • Why voltage must vary as frequency varies
  • How a single phase voltage can be turned into a three phase voltage to run single phase motors
  • Some of the latest developments in VFD technology relative to harmonics and power factor
  • Other uses of inverters, including uninterrupted power supplies
  • Applications where VFDs are effective
  • High voltage, high power applications and how these can be achieved

Speak to a Representative to Schedule a Seminar

For more information contact:

NORTH AMERICA
Ken Hudspeth, General Manager
Phone 1-877-PDHengineer (1-877-734-3644)
Email: ken.hudspeth@PDHengineer.com