What is the difference between vvvf and vfd

Compared to how many words there are to describe an interesting woman, I think that we have very few words for frequency inverters. Which isn't any different from a normal VFD, since these are forced to vary their voltage to avoid iron saturation. Perhaps it is a marketing man's way of making his drive 'different' from the competition! Always there when needed Incidentally the other attractive feature of motors from my point of view is also that the technology doesn't keep changing.

Compare our situation with say engineers in digital electronics - those fellows hardly dare go on holiday. Those distinctions make good sense and something I was never aware of.

I can't pass up the opportunity to comment wrt skogs' first post. I was wondering what Full Load Amps had to do with the question. Then I saw the one that just flew over my head. Made for a good laugh. I have learned most of the acronyms over the years, but then TLA floored me. So thanks to you for clearing that one up, and yes I was able to deduce the FLA.

I suppose FLW will be the next creation for bad language! Keep up the good work! The only thing that bothers me is the last one. I'm not sure, when I hear it spoken, whether the intended spelling is "freq" drive or "freak" drive.

Having lived and worked around these things for 15 years, that last spelling is a bit bothersome!!! One other note for the original poster.

An electronic soft start or reduced voltage starter is significantly different from inverter-based variable frequency drives in that the soft starter is not variable frequency. It is only manipulating the incoming sine wave, either 50 or 60Hz, to reduce the inrush current or the starting torque or both by reducing the voltage to the motor.

This makes the start completely dis-synchronous as far as the motor is concerned. Variable frequency drives, on the other hand, start the motor in its normal near-synchronous mode resulting in much higher torque per amp performance.

If your object in softstarting is reduced torque, the difference is small. But if your object is to reduce inrush current, the difference is significant. An inverter will always beat a softstart on reducing inrush currents for the same output torque. Of course, over 10hp, an inverter is more expensive too. It is as correcty stated above, Variable Voltage Variabel Frequency. If one only could make some money out of it too. Or at least a decent living Electrical motors use both AC and DC power.

VSD is the acronym for variable speed drive. This all-encompassing term describes drives which are used for controlling both AC and DC motors, and technically, even mechanically control. VFD is the term for a variable frequency drive. It refers explicitly to electronic drives which control the speed of AC motors through adjustment of voltage and the frequency delivered to motors.

The acronym VVVF is used most often in the mining industry to refer to variable voltage variable frequency drives. Search Advanced search…. New posts. Search forums. Log in. Install the app. Contact us. Close Menu. Welcome to EDAboard. To participate you need to register.

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