Max torque or Stall Torque is generally not shown on the motor’s nameplate.

used drives to control motor speeds and torques in order to manage line speed and process variables like thickness, grain formation, and winding tightness. We begin with an important point: Variable frequency drives do not make motors more efficient. This reduction in moving parts translates into higher system reliability and lower failure rates. A VFD can drive a motor faster than its nameplate speed, however, above the rated speed, the motor looses torque (twisting force).

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That may sound like a ridiculous way of running any machine. The same 2002 U.S. Dept. Default set ting is 60 Hz. A VFD can make a motor run slower than rated speed, however a major point of consideration at low speed is cooling. The original VFDs filled large cabinets and were unreliable. There are 5 critical variable frequency drive (VFD) limitations that should be considered when selecting the proper VFD for motor speed control applications. This is generally not a problem with centrifugal loads such as fans, pumps, and blowers because the torque required by the load drops drastically with decreasing speed. The motor operation was left relatively unchanged by running the pump or blower at a fixed speed while manipulating the output to match the process.

If you are already using VFDs or are considering their use for the first time, these limitations should be considers. A VFD can make a motor reverse without the use of contactors, but it can’t make the reversal faster than the combination of the motor’s max torque and the load’s inertia allows. While most new variable speed applications today use either induction, permanent magnet AC (PM), or Switched Reluctance (SR) motors, we will ignore these technology differences for the purpose of this article; each technology has its benefits and strengths. Irrespective of the type of compressor, whether positive displacement (reciprocating or rotary) or dynamic (centrifugal or axial), is the norm for most plants. The limits of VFDs.

The driving forces for this wide-scale adoption of variable speed technologies are the increase in energy costs, reduction in the cost of drives, enhancement in technology, and ease-of-use. If anything, the losses of a VFD add to the basic motor losses (due to harmonics; i.e., since the waveforms delivered by a VFD to the motor are not perfectly sinusoidal, there is additional heating of the motor). And yet, VFDs can help make an overall application, system, or process more energy efficient than without them. d-00 command frequency - This parameter represents the frequency that the VFD is commanded to output. info@inventionh.com This article will start with basic concepts and describe a couple of examples that relate some of the major challenges in applying variable speed for energy savings.

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