Learn the Basics of a 3 Phase Rectifier
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Date: 2023-11-17
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Comments and reviews: 28
CrotalusHH
PWM is the method of approximating the output sine wave today. Why? It's the cheapest of course. It did require the upgrading of motor winding insulation. Early PWM VFDs would punch through motor insulation so Toshiba wouldn't warranty replace a motor even if it was run on a Toshiba VFD. Almost all motors are VFD rated today. Earlier VFD designs used a variable DC Buss voltage that was regulated by SCR's or some sort of Buss Chopper instead of PWM. Some used Capacitor Banks to store the energy, others used Inductors. Variable Buss Inductor VFDs had a lot more iron in them and as a result were much more robust. I spent over 40 years starting up and repairing VFD's from every MFG you can name from fractional horsepower to 3000Hp, 230VAC to 4160VAC.
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PWM is the method of approximating the output sine wave today. Why? It's the cheapest of course. It did require the upgrading of motor winding insulation. Early PWM VFDs would punch through motor insulation so Toshiba wouldn't warranty replace a motor even if it was run on a Toshiba VFD. Almost all motors are VFD rated today. Earlier VFD designs used a variable DC Buss voltage that was regulated by SCR's or some sort of Buss Chopper instead of PWM. Some used Capacitor Banks to store the energy, others used Inductors. Variable Buss Inductor VFDs had a lot more iron in them and as a result were much more robust. I spent over 40 years starting up and repairing VFD's from every MFG you can name from fractional horsepower to 3000Hp, 230VAC to 4160VAC.
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Brock
Thanks for an informative and enjoyable video.
I would like you to make one change to your narrative in future videos because of my experiences as a prison teacher. You use guys to refer to people, but guys can also be used in a restrictive sense to refer to just males. Worse, in some cultures and situations, the use of the term can be encouragement for some men to prevent women from accessing videos about technical subjects. I have experienced this happen in relatively enlightened Norway. Think of what happens in less enlightened places, such as Iran. So I would like to encourage you to substitute people for guys, to make the world a more accessible place for everyone.
Once again, I found the video relevant and to the point.
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Thanks for an informative and enjoyable video.
I would like you to make one change to your narrative in future videos because of my experiences as a prison teacher. You use guys to refer to people, but guys can also be used in a restrictive sense to refer to just males. Worse, in some cultures and situations, the use of the term can be encouragement for some men to prevent women from accessing videos about technical subjects. I have experienced this happen in relatively enlightened Norway. Think of what happens in less enlightened places, such as Iran. So I would like to encourage you to substitute people for guys, to make the world a more accessible place for everyone.
Once again, I found the video relevant and to the point.
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Damon
My brother-in-law snagged a solid state three-phase inverter for use on his Bridgeport vertical mill, I helped install it and got to run it for some simple jobs. Works >really< well, especially the variable frequency output, and replaced a clunky old rotary converter that generated a pseudo three phase. I like that a full-wave three phase rectifier generates a ripple that's three times higher in frequency and thus makes filtering a lot more effective (not that I'll ever convert my amplifiers to three phase, but. Your explanation of the switching action clarifies the complexity of the action that makes three phase so elegant in use.
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My brother-in-law snagged a solid state three-phase inverter for use on his Bridgeport vertical mill, I helped install it and got to run it for some simple jobs. Works >really< well, especially the variable frequency output, and replaced a clunky old rotary converter that generated a pseudo three phase. I like that a full-wave three phase rectifier generates a ripple that's three times higher in frequency and thus makes filtering a lot more effective (not that I'll ever convert my amplifiers to three phase, but. Your explanation of the switching action clarifies the complexity of the action that makes three phase so elegant in use.
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David
Nice job I also have a tech question that seems perfect for this video. I have a ceiling fan with three different speeds plus reverse switch six lights that are with ballast, replaced bulbs, worked for a few seconds fluorescent bulbs with rectifiers connected to a switch with a dimmer slide on it. It is also over 20 years old fire covered in dust and cigarette tar and nicotine could use an assist power on no light no fan in power switch on no blown fire circuit breaker
In a while and Im actually recovering from my black Friday, shopping brain surgery a year ago. Thank you for your time.
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Nice job I also have a tech question that seems perfect for this video. I have a ceiling fan with three different speeds plus reverse switch six lights that are with ballast, replaced bulbs, worked for a few seconds fluorescent bulbs with rectifiers connected to a switch with a dimmer slide on it. It is also over 20 years old fire covered in dust and cigarette tar and nicotine could use an assist power on no light no fan in power switch on no blown fire circuit breaker
In a while and Im actually recovering from my black Friday, shopping brain surgery a year ago. Thank you for your time.
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Mark
Uh oh. Dont know what an IGBT is? Always define your initialisms then you first introduce them Im guessing I missed a few videos.
IGBT stands for insulated-gate bipolar transistor. It is a bipolar transistor with an insulated gate terminal. The IGBT combines, in a single device, a control input with a MOS structure and a bipolar power transistor that acts as an output switch. IGBTs are suitable for high-voltage, high-current applications.
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Uh oh. Dont know what an IGBT is? Always define your initialisms then you first introduce them Im guessing I missed a few videos.
IGBT stands for insulated-gate bipolar transistor. It is a bipolar transistor with an insulated gate terminal. The IGBT combines, in a single device, a control input with a MOS structure and a bipolar power transistor that acts as an output switch. IGBTs are suitable for high-voltage, high-current applications.
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Agus
Isn't the first part of the explanation incorrect? between the 2 and 3 sections both phase 1 and phase 2 are positive but 3 is fully negative, so the flow should be from both 1 and 2 to 3. Same thing happens in reverse a few times. Phases are off for a single instant, it shouldn't even be visible.
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Isn't the first part of the explanation incorrect? between the 2 and 3 sections both phase 1 and phase 2 are positive but 3 is fully negative, so the flow should be from both 1 and 2 to 3. Same thing happens in reverse a few times. Phases are off for a single instant, it shouldn't even be visible.
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EvilSapphireR
So the AC voltage that is getting rectified by the diode is the line voltage (difference between two phase voltages) in this 3 phase setup? Is this how automotive alternators work? 3 phases connected to a star (wye) setup, because the circuit diagrams look really similar.
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So the AC voltage that is getting rectified by the diode is the line voltage (difference between two phase voltages) in this 3 phase setup? Is this how automotive alternators work? 3 phases connected to a star (wye) setup, because the circuit diagrams look really similar.
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stefan
Im just angry I had to learn this 30 years ago from a frustrated professor pointing at non-animated circuit diagram saying, see its goes like this, then like this, then like that. Everyone understand? Good. Moving on. This explanation along with the animation is fantastic.
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Im just angry I had to learn this 30 years ago from a frustrated professor pointing at non-animated circuit diagram saying, see its goes like this, then like this, then like that. Everyone understand? Good. Moving on. This explanation along with the animation is fantastic.
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Jun
I am grateful that you take the time to thoroughly illustrate and explain electrical concepts. It has helped me be a better Electrical Engineer. Also this is great study material for the PE Power Exam. Thank you for being a great teacher!
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I am grateful that you take the time to thoroughly illustrate and explain electrical concepts. It has helped me be a better Electrical Engineer. Also this is great study material for the PE Power Exam. Thank you for being a great teacher!
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Riz
What a crap way it was taught at Uni, Uni was totally crap, always self learned in the field by doing and when teaching again by doing, and using great simulators.
This is a great presentation, everything in less than 7 minutes
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What a crap way it was taught at Uni, Uni was totally crap, always self learned in the field by doing and when teaching again by doing, and using great simulators.
This is a great presentation, everything in less than 7 minutes
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BAH
Thank you. I have wired many VFDs over the years and knew what they did but not how. When I started over 30 years ago there was a DC motors still around. First one I saw was very odd. 2 small wires and 2 large wires.
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Thank you. I have wired many VFDs over the years and knew what they did but not how. When I started over 30 years ago there was a DC motors still around. First one I saw was very odd. 2 small wires and 2 large wires.
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Jozsi
Car battery chargers contain inbuilt module with full protection, diodes separately fail depending on the bad batteries. These parts are cheap, probably ic modules also exist for this purpose with protection.
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Car battery chargers contain inbuilt module with full protection, diodes separately fail depending on the bad batteries. These parts are cheap, probably ic modules also exist for this purpose with protection.
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Brian
I was once inside a 100, 000A, 100Vdc, the bus bars inside were liquid cooled and the main bus bar was 2mx2m of pure aluminum, that weighed about one tonne for every 3m length. Input was 300, 000V AC 3 phase.
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I was once inside a 100, 000A, 100Vdc, the bus bars inside were liquid cooled and the main bus bar was 2mx2m of pure aluminum, that weighed about one tonne for every 3m length. Input was 300, 000V AC 3 phase.
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education
I feel you could decrease the speed of your explanation. I could not correlate the electron flow with phases. Please make this into a 2-3 videos. I m not am elec engr. Thank you.
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I feel you could decrease the speed of your explanation. I could not correlate the electron flow with phases. Please make this into a 2-3 videos. I m not am elec engr. Thank you.
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Todd
Thanks I bought a motor recently with 3 wires and the controller board is delayed - I think with this I can build a custom controller board for testing while I wait thank you!
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Thanks I bought a motor recently with 3 wires and the controller board is delayed - I think with this I can build a custom controller board for testing while I wait thank you!
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Tarodenaro
Damn, took me 3 years to fully understand it using boring B&W textbook, and 6 minutes with this animated switch.
guess i'm just too much a visual person then.
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Damn, took me 3 years to fully understand it using boring B&W textbook, and 6 minutes with this animated switch.
guess i'm just too much a visual person then.
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Lovro
Nice!
Some ideas for next videos:
- Precharge circuit
- More detailed PWM 6x control
- Fireboard and criticallity of preventing DC short on inverter side
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Nice!
Some ideas for next videos:
- Precharge circuit
- More detailed PWM 6x control
- Fireboard and criticallity of preventing DC short on inverter side
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ODT
Well put! How do they input single phase 220 and output 220 3 phase? On some frequency drives. I'm assuming just like split phase incoming current on the poles.
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Well put! How do they input single phase 220 and output 220 3 phase? On some frequency drives. I'm assuming just like split phase incoming current on the poles.
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Mohammed
Why the arbitrary numbers then? Why did you call the second diode a current flows through as diode 6? Why not diode 2? The numbering made ZERO sense to me.
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Why the arbitrary numbers then? Why did you call the second diode a current flows through as diode 6? Why not diode 2? The numbering made ZERO sense to me.
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Tiny
Having never given any thought to this, I honestly had no idea you could put a rectifier across 400v.
Well explained, good video, love the graphics.
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Having never given any thought to this, I honestly had no idea you could put a rectifier across 400v.
Well explained, good video, love the graphics.
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Brian
Ok 2 questions.
1. How can I have an inverter that takes in 120v and out puts out up 240v? I have a few of these lying around they are all small (
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Ok 2 questions.
1. How can I have an inverter that takes in 120v and out puts out up 240v? I have a few of these lying around they are all small (
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Joe
Great video, and excellently done very informative, a motorcycle I'm working on the stator has this setup to convert ac to smooth flow of dc.
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Great video, and excellently done very informative, a motorcycle I'm working on the stator has this setup to convert ac to smooth flow of dc.
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ronniestanley75
What is an IGBT? Every time I have ever played with these things there was 3 groups of SCRs (silicone controlled rectifiers.
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What is an IGBT? Every time I have ever played with these things there was 3 groups of SCRs (silicone controlled rectifiers.
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Gary
Did you know that if you use 'six wire' from the output coils and 12 diodes you can receive both plus and minus with a common point.
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Did you know that if you use 'six wire' from the output coils and 12 diodes you can receive both plus and minus with a common point.
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Thehumanlife
This video is solid proof of how much time you can waste in a standard university lecture about rectifier circuits.
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This video is solid proof of how much time you can waste in a standard university lecture about rectifier circuits.
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Hans
If you ever want to home school your kids this would be a great way to unlock there engineering mindset luv these vids
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If you ever want to home school your kids this would be a great way to unlock there engineering mindset luv these vids
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Clark
2: 28 I think the capacitor (negative stripe down) is wired backwards to the rectifying diodes (negative stipe up.
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2: 28 I think the capacitor (negative stripe down) is wired backwards to the rectifying diodes (negative stipe up.
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Frank
Too much for me to learn this shit. I just do regular house wiring like lights and plugs and switches.
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Too much for me to learn this shit. I just do regular house wiring like lights and plugs and switches.
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