variable frequency drives

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                      Variable frequency drives

 Hello guys... 
Today i will share some basic  information about variable frequency drive (VFD).

→WHAT IS VFD?

 vfd is nothing but variable frequency drive. it's device to control the induction motor's speed and torque mainly. by varying voltage and frequency of motor speed and torque can be adjustable in electro-mechanical combination. but there are many more use of vfd.( VFD; also termed adjustable-frequency drive, “variable-voltage/variable-frequency (VVVF) drive”, variable speed drive, AC drive, micro drive or inverter drive)
VFDs are made in a number of different low- and medium-voltage AC-AC and DC-AC topologies






                                         (This is simple picture to understand vfd working.)
→Working principle of vfd:-





The first stage of a Variable Frequency AC Drive, or VFD, is the Converter. The converter is comprised of six diodes, which are similar to check valves used in plumbing systems. They allow current to flow in only one direction; the direction shown by the arrow in the diode symbol. For example, whenever A-phase voltage (voltage is similar to pressure in plumbing systems) is more positive than B or C phase voltages, then that diode will open and allow current to flow. When B-phase becomes more positive than A-phase, then the B-phase diode will open and the A-phase diode will close. The same is true for the 3 diodes on the negative side of the bus. Thus, we get six current “pulses” as each diode opens and closes. This is called a “six-pulse VFD”, which is the standard configuration for current Variable Frequency Drives.

→Why should I use a VFD?



1 - Reduce Energy Consumption and Energy Costs

2 - Increase Production Through Tighter Process Control

3 - Extend Equipment Life and Reduce Maintenance


→

Benefits

Energy savings

Control performance






I would like to share some images of vfd's.....














⇉Personally i would suggest allen-bradley vfd- it is very high performance and ease of operations...

⇉In next post i will share the allen bradley vfd connctions and operations....
                                                                                           
                                                                                  (Electrical Engineer)

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