What is a VFD? (Variable Frequency Drive)

[@realpars]

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[@fimbles1015]

The quality and presenataion of these videos is simply amazing, Easy to follow and understand, Thank you so much! I recommend this channel to every engineer/ technician i know :)

[@realpars]

Hey! Thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback! If you ever have any questions, feel free to reach out to us. Happy learning!

[@narsimhanarsimulu4373]

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[@masoodsadiq9281]

Just finished watching your "what is a VFD?" video and, once again, the explanation was excellent, especially useful was the analogy of the water control pipeline. I started to read up about VFDs on a well-known online encyclopedia and was blinded with science. Your explanation was pitched perfectly and just what I needed as I'm working on updating our PLC to control an inverter for a water pump. Perfect, keep up the good work. Cheers!

[@realpars]

Awesome, thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback! If you ever have any questions, feel free to reach out to us. Happy learning!

[@jollyscaria1922]

Thankyou gues shering

[@ScabbyBoi]

Appreciate this simplified easily accessible explanation. I’m a civil engineer so I need to be familiar with the basic operation of a vfd, despite my lack of education in mechanical and electrical engineering. This video made great sense and has clarified the subject for me significantly. Thank you!!

[@realpars]

Thank you so much, @ScabbyBoi! We're glad you found it helpful!

[@GTiR23]

I'm an Electrical Engineer, your description is perfect.

[@realpars]

Thanks for sharing, Gary!

[@pcrb2695]

Dear, please share your knowledge on points 1) How to do wiring , i mean power wiring + control wiring of a VFD and its hook up with PLC 2) What are the configuration settings to be done inside the VFD for Siemens and Allenbradley ones 3) how to build a control logic for the same by using PLC programming. Kindly do the needful. You people are awesome, love u all

[@realpars]

Hi Hara! Thanks for your comment and your suggestion. I will pass this on to our course developers! Thanks for sharing and happy learning!

[@tuphi1684]

Always starting with the principles to create a strong foundation. That's what I like about your videos.

[@realpars]

Thanks for sharing your positive feedback! Great to hear.

[@ardentdfender4116]

They do lay down the fundamentals quite well in explaining things in every video fundamentally. I really appreciate that about them as well as the fundamentals help immensely in understanding and they do it in very simple explanation and animation. It’s just awesome.

[@jeffreyporto8113]

Thanks for the insightful comparison of electronic components to hydrologic systems . This opened a couple of doors quickly for me. To get an understanding of how a PLC interacts with a VFD has given me some confidence in my new job as a Flexographic printing Mechanic. It is my hope to not only comprehend but to be able to program fully automated six color presses to accommodate changes in production requirements across a wide variety of material and ink types. This work is gratifying and worthwhile for me and your program is now on my radar. Keep up the good work many thanks.

[@realpars]

Thanks for your comment, Jeffrey!

[@whailingwhale6352]

The world is quiet here..

[@ps9666]

Best animation video on youtube.

[@realpars]

Thanks a million, great to hear that!

[@pradip9034]

I am from India. It is easy to understand why used vfd. Thank u so much 😍

[@realpars]

Glad to hear that!

[@yousfiibrahim6863]

vfd controls the speed of the motor by converting AC to DC then back to AC with different frequency and it can be wired to plc to make the task automatic and get rid of a stupid operator! can't find any easier and straightforward explanation... GREAT JOB

[@realpars]

Thanks a million for your kind comment, Yousfi! We appreciate your support.

[@oficinadoeletricista]

Exceptional video lesson with an impeccable subject of a state-of-the-art equipment which is becoming indispensable in the most varied processes. It is fascinating to understand the conversion of AC input energy into DC energy and going out simulating an AC senoid through the width of pulses having the ability to control the speed of electric motors by frequency. Thank you very much and congratulations on the excellent work. I'm from the city of Manaus, in the State of Amazonas, Brazil, country, located right in the middle of the Amazon rainforest, where incredibly there are several of these equipment, and I accompany you.

[@realpars]

Our pleasure! Thank you very much for your kind comment, and for sharing that with us. Happy learning!

[@jasonbravo4703]

Widely used as well in HVAC, especially in FAHUs, AHUs, and Chilled Water Pumps.

[@wiserdaley2191]

Super awesome explanation! Thank you Sir! What a smooth instructor 💯🙌 I treasure this channel now...I rarely come across lucid and well articulated information like this. Thank you!!!💯👍🙌🙌🙌🙌

[@realpars]

Thanks for your support! Happy to hear that.

[@Punisher-1]

Explanation is flawless.

[@realpars]

That is amazing to hear, thanks for sharing that with us!

[@ashishkinkar2087]

Sir, in this video you cover most of the part related to the application, please make one video which will give details about the VFD internal functions, which is actually important. Thanks

[@realpars]

Hi there, thanks for your comment! I will send your request through to our creator team.

[@Abdulaziz0Ghamdi]

Easy to get information and difficult to forget it Thanks a lot

[@realpars]

That's great to hear! You are very welcome.

[@boutkarmissthicham3985]

most important informative channel i've seen in my career proud to be a follower many thanks

[@realpars]

Thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback! If you ever have any questions, feel free to reach out to us. Happy learning!

[@JoelLopez-mc3zl]

Thanks for excellent and clear explanation

[@realpars]

You are welcome!

[@josemartinez-jt6tw]

I NEVER comment but I’vegot to say best video explanation ever. Good job, you got me as subscriber

[@realpars]

Thanks a million, Jose! We truly appreciate that.

[@gadoragadoraa4774]

Guys those people are really awesome isn't it😍

[@MrDoneboy]

I work for a major American city's, public works department, and Plc's and scada systems, and even one vfd system is in use.

[@dennistaiwo1467]

Thanks for the video real pars. Pls show a video on how to use a PLC to control the consumer unit of a residential building. Thanks

[@realpars]

Hi Dennis! Thanks for your comment and your suggestion. I will pass this on to our course developers! Thanks for sharing and happy learning!

[@saeedbagheri8525]

thanks for amazing presentation , i,m a water treatment technecian .. good works REAL PARS

[@AnChY9498]

Very useful and perfectly explained. Thank you!

[@realpars]

Glad you enjoyed it! Happy learning

[@lednique2742]

The check valve (2:06) is drawn backwards. It will not allow flow in the direction animated in the video.

[@arunkumara2118]

Very clear explained about vfd. Thanks alot

[@realpars]

Glad it was helpful!

[@mansoor.r7251]

Sir your video is wonderful

[@realpars]

Happy to hear that, Mansoor! Thank you!

[@Kankooro]

Very informative. Needed to touch up my understanding of one when I wondered as I was supplying line voltage to one. I never fully understood them.

[@realpars]

Great to hear! Keep up the good learning :)

[@shinodashinoda9059]

Sir your videos are just great Thanks a lot.

[@realpars]

Thanks for your compliment, Shinoda!

[@islammuhammed1092]

Kindly make a video comparison between VFD vs Soft starter

[@realpars]

Thank you! We have this topic on our list, hopefully, it will be up soon!

[@sircull4047]

I think they are basically the same thing.

[@SukhdeepSingh-jt9qk]

Very useful video. Thank you for existing.

[@realpars]

Glad it was helpful! Happy learning

[@lutfimaulana3592]

Good Channel broo, greeting from Indonesia ~

[@realpars]

Thank you, Lutfi!

[@محمدالسقاف-ث2ر]

This is the backbone of power electronics

[@sushilgharat2264]

Nice video.. Many thanks for RealPars for spreading technical knowledge with better and simple animation.. Thank you..

[@realpars]

Thanks for your positive comment! Happy to hear that. Happy learning!

[@ivanmarchenko4822]

Thank you for video. Please tell me 03:58 why you have higher frequency and slowly rotation?

[@realpars]

Thank you for your question! You’ve raised a good point. In a VFD, we work with a feeder power source, utilizing its voltage, current, and frequency to control the motor's actions. By adjusting these parameters, we can achieve the desired torque during slow startups for heavy loads, preventing motor damage. To get the results we want, we need to program the frequency, voltage, and current parameters accordingly. If you’re a member of our platform, you can learn more about these drives and their general applications. You can check those out over here: www.realpars.com/courses Happy learning!

[@jenspi4725]

At 2:08, is the check valve symbol in the correct orientation? I thought the "eye" always looked in the direction of allowed flow. Thanks.

[@realpars]

You are correct. The orientation of the check valve is reversed if the flow is from left to right.

[@Premkumar-eq1zv]

iam studying Engineering on electronics and instrumentation , your tutorials are helpful to me.

[@realpars]

Great to hear that! Keep up the learning curve! Let us know if you have any questions.

[@idontcareforthis]

At 2:20 your check valve is back to front. It would actually block water from reaching the filter.

[@realpars]

Thank you for pointing that out. You are correct, the orientation of the check valve is reversed if the flow is from left to right.

[@rachidlamzougui1683]

VFD is a motor drive that controls AC motors, it converts AC into DC using a diode then it filters the current by a capacitor then converts DC into AC using a transistor. What a solid state motor drive

[@realpars]

Thank you for your question! It sounds like you’re asking about the difference between a Variable Frequency Drive (VFD) and a solid-state drive. Here’s a quick explanation: VFDs: Primarily used to control the speed and torque of AC motors by adjusting the frequency and voltage of the power supplied. Solid-State Motor Drives: A broader category that includes VFDs but also covers drives for various motor types (AC, DC, and stepper motors). These drives use semiconductor technology to control motor functions. We hope this clarifies things. Happy learning from RealPars!

[@rachidlamzougui1683]

@@realpars thank you a lot ❤️

[@JesusSanchez-zc8fk]

Really straight-forward and simple; awesome explanation!

[@realpars]

Great to hear that! Thanks for your support.

[@OfficiallyOrca]

We use VFD on boarding bridges at my job Great information great explanations

[@realpars]

Glad it was helpful! Thanks for sharing your positive feedback

[@petrutarabuta5617]

Excellent information. Thanks!

[@realpars]

Glad it was helpful!

[@jeramelbarcelo1075]

Thankyou for this. I finally understood how IGBT works on VFD's. God bless this channel

[@realpars]

Great to hear, Jeramel. Keep up the good learning!

[@bassamalsoufi]

Very good Please change the direction of the check valve as it was reversely installed

[@anuragdabral10]

Thanks. It was so much easy and explained well. 👍now vfd concept is clear to me

[@realpars]

You are very welcome! Thanks for your support.

[@rammilanthakur9363]

Hello.. Bro.. your videos are very informative and helpful.

[@realpars]

Thank you!

[@brofenix]

^^ Thanks RealPars, this is a good intro video. Great water animation on the discharge of that pump also, nice :)

[@realpars]

Thanks for your support! Great to hear that.

[@totalcardetailing2022]

Keep these videos coming. Thanks

[@realpars]

Thank you! We will. Happy learning!

[@johnkeepin7527]

So far, so good. These days, 3 phase VFD is used for most modern electric trains, and hybrid or full-on electric road vehicles, after the advent of integrated gate bipolar transistors (IGBT). Typically done with triple inverters (one for each phase), capable of working in both directions, for regenerative braking when required, using the 3 phase motor as an alternator.

[@realpars]

Hi John, Thanks for sharing your knowledge with us! We always appreciate that.

[@trump1105]

One the money with this comment

[@LEPOX208]

The best sounding VFD’s are found on Siemens locomotives like the BR 182 and BR 406 etc.

[@SanDiegoFreddy]

Such a great video! Thank you so much.

[@realpars]

Glad it was helpful! You're very welcome

[@crypto1633]

Thanks for the video this just made my idea of a off grid induction motor and centrifugal pump to pressurize the water to drive pelton turbines for my hydro electric system a reality for my bitcoin mining operation, simply put much like the video i was wondering how i could control the pump speed for pressure to drive the pelton turbines to have more control on the overal out put of the generators also the electric motor is also powered by the same generators currently figuring out how to switch power sources for shutdowns for maintenance purposes where i would have to hydro systems to switch between to service but maintain electricity.

[@Sultan-ce5hd]

Great channel keep on 👍🏻👍🏻👍🏻👍🏻🌹

[@realpars]

Thank you, Sultan!

[@zusyee8926]

A Very Fine Video. about a Variable Frequency Drive. Possibly used by......

[@realpars]

Great to hear! :) Happy learning.

[@vishveshpatel3932]

Good and easy to understand

[@realpars]

Great!

[@stevenlee5755]

Maybe you can visit our store to find what you need or ask for help:topstock.aliexpress.com

[@noahv.6486]

Glad to know what I'm resetting at work lol, I really want to learn how all the stuff I use at work works and found your videos super informative!

[@realpars]

Glad to hear that our video course was helpful to you, Noah! Happy learning.

[@silviadcunha1874]

Its a very good explanation

[@realpars]

That's great to hear, Silvia! Thanks for sharing and happy learning!

[@gauravbhaskar4368]

Very useful ❤

[@realpars]

Glad to hear that!

[@PBS-nm1uu]

great presentation, the best i have seen please keep them coming thanks.

[@realpars]

Thanks a lot for your support!

[@doctorsixto7422]

Very informative video. Thank you! New subscriber here. Im a student in automation and its very helpful for me now as we make our thesis :)

[@realpars]

Great to hear that! Welcome to the RealPars family! If you have any questions, feel free to leave them in the comment section. Just to let you know, that we also have a free course on PLC Hardware bit.ly/2XnnUrF Happy learning!

[@adamhankovsky7357]

Same for me. Very clear and helpful

[@majidbld7632]

Good job,now it's easy to understund

[@realpars]

Great!

[@nurielramalli4539]

thank you for very good and useful information. can we use the VFD drive in sewage pumping station? how we calculate the power needs when we use VFD drive?

[@realpars]

Hi Nuri, Thanks for your comment and for your feedback! I will happily go ahead and pass your questions on to our course developers as a topic suggestion. Thanks again and happy learning!

[@swomsushi604]

very fascinating description indeed

[@realpars]

Thank you, Andrew!

[@aswinidas7065]

Thanks for this video , it's easy to understand

[@realpars]

Great to hear!

[@Ethel-Wobo]

Perfect explanation

[@realpars]

Glad you liked it

[@naushad_warrior]

Nice Explanation

[@realpars]

Thanks and welcome!

[@AhmadAfifIsa]

Thank you. Helps me a lot in understanding what is VFD.

[@realpars]

Great to hear that, Ahmad! Happy learning.

[@nkhvnkhv7763]

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[@bbmeme2010]

Thank you for posting. Great intro video.

[@realpars]

You're very welcome!

[@rajeshr436]

Thanks for the informative video. The check valve direction needs to be reversed though.

[@santoshsahu2315]

Respected Sir. Nice Video .We needs more vfd video..

[@realpars]

Thanks a lot!

[@gregorysuarez7978]

Your graphic of flow thru the water pump into the holding tank is reversed. On skid-mounted pumps the suction is on the the end of the volute & discharge pumps out the top of the pump housing.

[@eeeknowledge2850]

Informative about VFD. Thanks

[@brandonlee9528]

keep your opinions to yourself.

[@neboshigcpreparationandjob6736]

Great work!

[@realpars]

Thank you!

[@philnwanne6685]

Nice video, was really helpful. Thanks a lot!😊

[@realpars]

Thanks for your support!

[@tahsindisli2962]

It was very useful.Thank you.

[@realpars]

Happy to hear that, Tahsin! Thanks for sharing!

[@smohammed7094]

Thanks for the video I thought VFD would give more torque at the initial start up to reduce mechanical load than it can regulate it either manually or automatically by using PLC.

[@labibahmed6140]

nice from Bangladesh and thanks for English subtitle

[@realpars]

You're very welcome! Happy learning!

[@greenpakistan3184]

Sir your videos are very informative but sorry to say in this video you did not explain deeply about vfd. How we can control frequency how much minimise and maximise the frequency. What is the function of PWM how it works and which components use in PWM card for controlling the frequency

[@realpars]

Thank you for your feedback @greenpakistan3184. Yes, you are correct. Our video is meant to be a short version of the real technical version. There is only so much we can say in 8 minutes or so. If you have not signed up for our free trial, I would recommend that you take advantage of it and learn more from us on this topic. To add more to this, VFD engineering varies between drive manufacturers, with some similarities. Here is a link to a book company where you can purchase hard copies or eBooks to learn with our lessons: www.atplearning.com/

[@danvithana95]

So much details in one simple video. This is how they teach at school unfortunately

[@realpars]

Thank you for your support!

[@emadabdulrahman9234]

Thank you for this video I learn great things 🌹❤️

[@realpars]

You are very welcome, Emad!

[@davef3179]

Got a question! I'm a bit confused. If you start out with AC, why convert it to DC just to convert it again back to AC? What is the difference between the initial AC and the final output AC? What is the reason you can't just use the transistors to control the frequency from the original AC source?

[@realpars]

Hi Dave, thank you for your question! In order to change the frequency of the AC sine wave, the incoming supply must be transformed. The most effective way to do this is to convert the current to DC and then reform the AC signal at a different frequency. This process also allows the VFD to maintain a constant Volts/Hz ratio, which is important for maintaining the integrity of the motor windings over a long period of time. Inductive reactance acts as a resistor and can cause excess heat dissipation if the V/Hz ratio is not maintained. Therefore, there are multiple benefits to converting from AC to DC and back to AC, including being able to provide a cleaner (filtered) AC feed to the motor. Hope this helps, and happy learning!

[@Mulazim.]

Informative video! Suppose we have a traditional inductive motor with maximum 1400 RPM, then we connect that motor to a VFD, here is the question: Does it possible to increase the RPM of the same motor more than 1400 RPM by increasing the frequency? And does the power consumption will increase?

[@realpars]

It is possible to overspeed a motor by setting the frequency above the nameplate frequency. However, motor torque will start to decrease above 100% speed. This occurs because the faster speed leads to increased slip, which robs the motor of torque and converts the excess energy into heat and efficiency loss. Overspeeding a motor is sometimes done with fans, but there can be adverse effects of doing so. Power consumption depends on the loads that are connected to the motor.

[@Mulazim.]

@@realpars In my case it's a water pump one horse power 746 watts, my plan to make a basic inverter or a soft starter circuit in order to run that motor on UPS 12/220v--1200 watts,but I face problem that my UPS circuit breaker cutting off due to rough start

[@luisg.delagarza7338]

Thank you, very informative video. You have a new subscriber.

[@realpars]

Great to hear that, Luis! Thanks for the support.

[@asadsalim1914]

Good job Please do industrial networks and their classification

[@realpars]

Thank you. I will pass your request on to our creator team.

[@HypedKryptic]

Very Simple and Easy-to-follow explanation. Thank You

[@realpars]

You are very welcome, Michael!

[@Engineerboy100]

Awesome job! Love these presentations. I will be building a Tumbler operating using a VFD controller on the motor. I am making a video of it now too.

[@realpars]

Thank you, Clint!

[@gmodesike]

Great video!!

[@realpars]

Thank you!

[@oktaytekin4560]

Thank you very much.l am mechanical engineer.Nice to meet you .l will be watching you.

[@realpars]

Hey there! nice to meet you too! Happy to hear that you are enjoying our courses. Happy learning

[@laddisaini7885]

Thanks for the information, will you please give explanation for, why we convert AC into DC then again to AC?

[@realpars]

There are two reasons. The first is to provide a "clean" AC output to the motor. The rectification from AC to DC allows the IGBT's or SCR's to "reassemble" the AC sine wave as free of electrical noise as possible, even if there is some noise on the input circuit. Secondly, rectification and inversion is the easy and cost effective way to change frequencies on the AC circuit. In a VFD, the voltage is also adjusted as to keep a fairly constant Volts/Hz ratio. For very large motors, there are devices being developed for industry called Direct Matrix Converters which will be able to perform voltage and current conversion in one single stage without converting to DC.

[@bhattuswathi1759]

Hii this is Swathi from India Did u heard about SFC and FCMA starters If you did please make a video on them..and i must tell you your channel content is so helpful to my work.. thank you ☺️

[@realpars]

Hey Bhattu! Thanks for your comment and your suggestion. I will pass this on to our course developers! Thanks for sharing and happy learning!

[@tony20499]

Thanks for these coureses. They are very useful.

[@realpars]

You are very welcome, Anthony!

[@tamilarasanmarimuthu4900]

Easy to understand...Thank you

[@realpars]

Great! You're very welcome.

[@oktaytekin4560]

Thank you very much.The explane iş very good.

[@realpars]

You're very welcome! We are happy to hear that. Happy learning!

[@jessdimac]

Thanks for the info sir

[@realpars]

You're very welcome!

[@johnsmith4630]

Your analogy of the capacitor being like a water filter is a poor one. The cap is there to resist Voltage sag if there is a load spike upon the rectifier. An apt analogy might would be an air bladder pressure tank in a water system there to maintain water pressure even if the putput is temporarily greater than what the pump can produce

[@johnsmith4630]

Sure, this use of capacitors is oft referred to as “filtering” which is, in a manner of speaking, not an inaccurate way to talk about it, but your water filter analogy is leaves out a lot

[@dheerajdhawas7207]

Very informative....but need to elaborate more of this...can make a video on types of vfd like VVFD and it's wiring explanation...

[@realpars]

Hey! Thanks for your comment and your suggestion. I will pass this on to our course developers! Thanks for sharing and happy learning!

[@zeechannel4229]

Very nice method to explore

[@realpars]

Happy learning, Zeeshan!

[@raghunathvelip6856]

Very nice helpful video.

[@realpars]

Happy to hear that!

[@barsmutaf8457]

Can you make a video about choosing vfd depend on application and motor type?

[@realpars]

Thanks for your topic suggestion, Baris! I will happily pass this on to our course developers. Happy learning!

[@cristianoahmad7]

So useful, thank you so much

[@realpars]

Amazing, Ahmad! Thanks for your support.