Webinar
No. E-2014W
In Variable Frequency Drives, you'll learn ...
- 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 were initially 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. Additionally, the most modern VFDs are much more efficient than older models.
By their very nature, most alternating current (AC) motors are not easily speed controlled. And providing a means to continuously vary the speed of an AC motor has always been particularly challenging. In addition to covering modern VFDs, this webinar will explore the different ways engineers have attempted to control the speed of AC motors through the years, including the use of continuously variable belt and sheave systems. As we review the historical developments and advances in AC motor speed control, we will see how engineers are doing things with VFDs now that were once deemed impossible.
If you are involved in the design, operation or maintenance of any facility that has motor-driven equipment, then you won’t want to miss this popular webinar.
Specific Knowledge or Skill Obtained
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
- Pumps, conveyors, process lines, precision speed control, bypass circuits
- High voltage, high power applications and how these can be achieved
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