How do VFD Switching Frequencies Affect Harmonic Distortion?

VFD switching frequency refers to the rate at which the DC bus voltage is switched on and off during the pulse width modulation (PWM) process.
Harmonic distortion occurs when a #VFD converts power from an AC to a variable frequency output to a motor. The harmonics occur as the transistors rapidly turn on and off at a rapid speed. Harmonic distortion in a drive can be reduced by increasing the speed the at which the IGBTs operate to get a cleaner sine wave for better motor operation.
#PulseWidthModulation #PWM #VariableFrequencyDrives
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[@bishantkumar12589]

Thank you so much. So useful video and precise

[@filippetkovic9743]

the best explanation ever crazy good thanks sir!

[@midkort]

Great job, sir. Thank you.

[@AhmedElkirsh]

phenomenal video

[@belalhossen3291]

Thank you very much this video is very helpful for motor drives

[@KEBAmerica]

You are welcome

[@Sarcastix7]

Super helpful explanation. Thank you

[@KEBAmerica]

You are welcome!

[@Clay300]

Makes me want to learn sonar and transmit more data through echos like a transponder frequency

[@ovais.akhter]

Wow. Amazing skills

[@ManojKumar-jw5ys]

thank you sir

[@Elecnova]

Thanks for the information. Did you face the problem for the resonance ? how to fix this problem?

[@rafaelc2367]

Came for the class, stayed for the teacher

[@Olavotemrazaodenovo]

Thank you.

[@KEBAmerica]

You're welcome!

[@manojkale9212]

Just want to know that is there is disadvantages by using IGBT VFD drive , or any damage to 3 phase as borewell pump.

[@georginikolov5150]

Tank you, nice work. But some peapole advise, don't go above 4khz carrier frequency, to avoid damage of motor winding insulation. What do you think about this effect?

[@Hambxne]

nice background music choice

[@bishantkumar12589]

Please make a video on use of Choke in drive ? How it reduces harmonics !!

[@KEBAmerica]

Good idea, Bishant. We will consider doing a video on this topic in the future. Thanks for the comment!

[@prashantpant8501]

Thanks for the information. I have a question, If we are increasing the switching frequency will it not effect the output voltage ? Since output voltage is rms of the pulses that we get from the switching of IGBTs.

[@KEBAmerica]

Thanks for your question,
As the switching frequency increases, in order to maintain the same RMS output voltage, the pulse width is reduced. This is the function of the pulse width modulation. The amplitude of the voltage pulse, when the output transistor switches on, is the DC bus value of the drive. So this does not change with increased switching frequency. By reducing the pulse width (or on time of the transistor) the RMS voltage can be controlled by the VFD. I hope this helps.

[@prashantpant8501]

@@KEBAmerica Thanks for the reply, yes it helped me understand.

[@AliRaza-tw3re]

Can you make the video about the error trouble shooting . error no(E.SEE) keb 6

[@KEBAmerica]

Hi Ali Raza, can you tell us specifically what is your application? We are in a continual process of making helpful videos for people using KEB products. If you need a specific answer more quickly then please contact us or a KEB location near you. kebblog.com/about/

[@hamidou5126]

Hello bro amazing work please I have a problem in my work In the induction machine i did give him a pwm when i implemented the machine didn’t work I give him fm (50*50) carrier and dspace work te 0.001

[@KEBAmerica]

For technical issues like this it is best to talk to a local KEB representative to troubleshoot. Thanks for using KEB products. Have a good day! www.keb.co.uk/company/company-group

[@tomernawan7339]

Hello sir..N is represented what sir?

[@shubh7015]

sorry for the silly question, may i know what 'n' denotes in the harmonics formula?

[@KEBAmerica]

The "n" in the formula is just a simple way to represent a variable in the equation. We could, theoretically, use any letter, but when actually calculating the harmonics the letter would be replaced by the integers from one to infinity.

[@raghavendaranj3838]

why are we multiplying the input voltage with root 2 value

[@KEBAmerica]

Thanks for your question, @Raghavendaran J
Short answer: It's just the relationship between the AC input and DC bus voltage because of the six pulse bridge rectifier used in VFDs.
The long answer gets into more electrical engineering/physics theory. You can read our article on our blog for a little more information on the subject: kebblog.com/vfd-switching-frequency/

[@bishantkumar12589]

RAGHAVENDARAN J that's general concept. In ABB, DC vtg is 1.35 times of I/p AC

[@SureshBabu-iu8mm]

V/f theory is application is there here?

[@ramsanjeevanverma5235]

How to reduce Harmonics

[@qzorn4440]

Gee, is the vfd tech headed towards a vfd RF-generator-transmitter, radio-motor-receiver, or Tesla-motor-theory?

[@yuechen2421]

what is n?

[@KEBAmerica]

Mike explains it right in the video here: th-cam.com/video/-m-5b6jOMSo/w-d-xo.html
Also, if you want to know more about PWM you can read the full blog post here: www.kebamerica.com/blog/vfd-switching-frequency/

[@mohamadsafari2112]

Indonesia please

[@Dc_tech386]

Ok I see

[@cyrilllandau9935]

Is that Matt Damon?

[@doanster]

Most impressive backward writing skills!

[@georgH]

It's mirrored.
1. His watch appears on his "right" arm in the video. Most people wear it on the left.
2. The brand on the shirt is almost always on the left side, yet it appears on his right in the video

[@georgH]

For some reason it's quite uncanny to watch

[@KEBAmerica]

Yes, it is mirrored. :)