How do VFD Switching Frequencies Affect Harmonic Distortion?

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How do VFD Switching Frequencies Affect Harmonic Distortion?

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Күн бұрын

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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Пікірлер: 48

@bishantkumar12589 5 жыл бұрын

Thank you so much. So useful video and precise

@filippetkovic9743 3 жыл бұрын

the best explanation ever crazy good thanks sir!

@belalhossen3291 3 жыл бұрын

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

@KEBAmerica 3 жыл бұрын

You are welcome

@AhmedElkirsh Жыл бұрын

phenomenal video

@Sarcastix7 3 жыл бұрын

Super helpful explanation. Thank you

@KEBAmerica 3 жыл бұрын

You are welcome!

@ManojKumar-jw5ys 2 жыл бұрын

thank you sir

@Clay300 4 жыл бұрын

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

@rafaelc2367 4 жыл бұрын

Came for the class, stayed for the teacher

@midkort 3 жыл бұрын

Great job, sir. Thank you.

@bishantkumar12589 5 жыл бұрын

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

@KEBAmerica 5 жыл бұрын

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

@Olavotemrazaodenovo 4 жыл бұрын

Thank you.

@KEBAmerica 4 жыл бұрын

You're welcome!

@Elecnova 2 жыл бұрын

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

@ovais.akhter 4 жыл бұрын

Wow. Amazing skills

@georginikolov5150 3 жыл бұрын

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 4 жыл бұрын

nice background music choice

@tomernawan7339 8 ай бұрын

Hello sir..N is represented what sir?

@manojkale9212 4 жыл бұрын

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

@prashantpant8501 5 жыл бұрын

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 5 жыл бұрын

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 5 жыл бұрын

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

@ramsanjeevanverma5235 Жыл бұрын

How to reduce Harmonics

@hamidou5126 3 жыл бұрын

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 3 жыл бұрын

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

@SureshBabu-iu8mm 3 жыл бұрын

V/f theory is application is there here?

@doanster 5 жыл бұрын

Most impressive backward writing skills!

@georgH 5 жыл бұрын

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 5 жыл бұрын

For some reason it's quite uncanny to watch

@KEBAmerica 5 жыл бұрын

Yes, it is mirrored. :)

@shubh7015 4 жыл бұрын

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

@KEBAmerica 4 жыл бұрын

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.

@mohamadsafari2112 Жыл бұрын

Indonesia please

@AliRaza-tw3re 6 жыл бұрын

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

@KEBAmerica 6 жыл бұрын

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/

@Dc_tech386 2 жыл бұрын

Ok I see

@raghavendaranj3838 5 жыл бұрын

why are we multiplying the input voltage with root 2 value

@KEBAmerica 5 жыл бұрын

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 5 жыл бұрын

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

@yuechen2421 2 жыл бұрын

what is n?

@KEBAmerica 2 жыл бұрын

Mike explains it right in the video here: kzfaq.info/get/bejne/Y9NdaMVnz7Wxg6M.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/