The inspiration for a homebrew electric car start right here!
@subcooledheatpump
7 жыл бұрын
Just make sure you get a VFD with torque control
@williamwidener4282
6 жыл бұрын
I have seen videos on KZitem of people doing that just that and yeah torque control would be a good idea. I wonder if there is a vfd with idle speed capability
@kennysmith2275
3 ай бұрын
I just saw your video from 8 years ago. My VFD has a DC input. It's new. My question is, I'm starting a three phase motor from the DC, it's powering a generator. Once the AC current comes back to the VFD will it automatically transfer to the AC voltage.
@Buzzhumma
3 жыл бұрын
How can i run my 380v bldc motor from a vfd. It does run but gets hot quick . I need to modify the stepped pwm output to a straight dc pulse . Capacitor in series on each output ?
@digitald5851
3 жыл бұрын
You've inspired me to build a VRF HR system from scratch. I'm wondering if there is an advantage to rectifying externally and feeding DC to the VFD, versus allowing it to happen internally?
@desertdave
8 жыл бұрын
HI, Love you MOSFET stuff and I have been getting stock of the driver IC's for our UK customers at BasicMicroUK and many customers that have purchased these have mentioned your advice when calling to order, I am going to be doing some high power experiments with MOSFETS soon that I hope to share on you tube, on the subject of these AC inverters powering them from DC is even easier than you mention here, because the front end is in effect a rectifier you can simply feed the DC voltage into ANY of the existing 3 phase input terminals and in any polarity it does not matter and it will work perfectly, another advantage of this method is that you will still be using the drives built in capacitor pre charge circuit so no need to make an external circuit with a pre charge resistor and bypass contactor, I have a 20HP inverter running from a super capacitor bank connected in this way, the only disadvantage of this method is if you come to want to make use of the REGEN power but for simple powering up of 3 phase fans or machine tool motors from DC its perfect, I hope this helps, Keep up the good work, Dave.
@subcooledheatpump
8 жыл бұрын
Sure you can put DC directly into the rectifier and turn on the VFD that way. But don't forget all that current flowing through the rectifier is just creating needless losses. There is no such thing as a perfect diode, and every diode has a forward voltage drop. Granted for a small VFD the losses are negligible, but for a 20 HP machine like you've mentioned, I'd personally just use an external contactor and precharge to avoid heating the rectifier. Thanks for watching
@PaulAndMuttley
8 жыл бұрын
Well done! What sort of boost converter are you using? I am working on an isolated boost converter that can operate on input of nominal 12, 24, and 48 VDC, with outputs of 150, 300, and 600 VDC. By using a full wave bridge input at 50% duty cycle, the rectified output only needs a small capacitor. I think I can get about 800-1000 watts using an E55/28/21 ferrite transformer, and hopefully about 95% efficiency at 50kHz. I'll be posting on DIYelectricCar and I'll probably make a video on KZitem as well.
@turzaishaat
4 жыл бұрын
Was looking for the answer everywhere. Nothing found. Here is the picture what if we connect 3 individual dc to ac inverter (single phase 240v) to the 7.5kw VFD drive as the 3 phase input to get the 3 phase output. Planning to run 415v 4kw motor. It may be a stupid question as i am not an electrician. Few things to note 1. VFD's with DC bus are bit expensive or can say 3 phase to 3 phase vfd are very easy to find. 2. Not sure about the Dc to dc booster reliability. Thanks for sharing your knowledge.
@subcooledheatpump
4 жыл бұрын
Not sure about using 3 separate inverters. It might work but it would be best if they were actually in the correct phase relative to each other. That would be difficult to achieve if they are apart from each other. You might try just connecting the DC to the input. Most modern VFDs are just powered right from the DC bus anyway so the input would likely lead directly to the rectifier. Not sure why a DC-DC boost converter would be less reliable than a DC-AC inverter. In fact, a boost converter is actually much simpler and has fewer parts
@turzaishaat
4 жыл бұрын
@@subcooledheatpump Thanks Bro, Will try with the DC Bus or let see if can make an Input. will update about the outcomes.
@fredgoff4246
8 жыл бұрын
Hello Friend, I want to thank you for this video, it has helped me a lot. I am now a fan of your channel
@jasonbay13
7 жыл бұрын
i've got 2 rubicon vfd units good for 60hp motors. 480v 3 phase input with built in transformer to 120vac for control circuitry. what would happen if i were to remove the 120v transformer, hook 120v to that and use dc for the dc bus? would that work, and would i be able to run less voltage to run say a 208v motor? (it probably has software errors for low voltage to motor, though)
@subcooledheatpump
7 жыл бұрын
You can supply separate 120 volts AC to power the control circuitry, but i'd use an isolation transformer. You should then be able to supply DC to the bus directly, as long as the control circuitry allows the bus voltage to go that low, it should work. There is a good chance however, that it will lock out on undervoltage. Although you could just use 480 volts and reprogram the V/F pattern. Unless you've only got 208 volts? Not sure what you're trying to do but usually 480 volt drives want atleast 600 volts DC on the bus
@delicacydelight
6 ай бұрын
could you not just connect DC on the input side; its rectified anyway?
@rafaellarios3707
8 жыл бұрын
Hi subcooledheatpump, Good videos you got there! I have one question, though: Where did you get all those VFDs from? Keep up the good work. I just subscribed to your channel. Rafael.
@gbengaoyede2877
5 жыл бұрын
You know have been thinking about this a lot, thanks for the video, but i believe any vfd can run on dc either through modification or no modification.
@mjp0815
3 жыл бұрын
The vfd in your van, does it charge/regen the battery too?
@whirled_peas
2 жыл бұрын
The brake resistor circuit would do exactly that.
@pawanjakhu5384
4 жыл бұрын
Sir in vfd abb acs 355 everything is ok when command os given then output not come out frequency is start why
@subcooledheatpump
4 жыл бұрын
Check for input phase failure detection. If the drive has that feature, turn it off
@Crestone-saju
5 жыл бұрын
Enjoyed your post. Thank you. Question for ya. Is it possible to convert vfd output to full wave? By connecting bridge rectifier. Thank you
@subcooledheatpump
5 жыл бұрын
It should be possible, although I'd use an LC filter on the output before going into the bridge rectifier
@Crestone-saju
5 жыл бұрын
@@subcooledheatpump thanks for your quick response
@Crestone-saju
5 жыл бұрын
@@subcooledheatpump what output lc filter "reactor" would you recommend? I've seen few online with max 400hz. Thank you
@Crestone-saju
5 жыл бұрын
@@subcooledheatpump 1000v bridge rectifier didn't work. Can Transformer Rectifier Unit TRU 115v 400hz drive from vfd controller? Do you happend to kno, if they make higher voltage bridge rectifier? 2000v plus. Ty
@14jerseyboy56
7 жыл бұрын
I hope I'm not being a pest!, but I found this parts break down manual in pdf form for my drive online, and it is showing the cap values @ 1400uf 400vdc. Parts List Part Number Description Quantity CC0236A06 CAP,ALE,1400UF,400VDC,-10+50%,85C,BRKT 2.000 EA. So my assumption is that I shouldn't charge these caps past 400vdc right?!
@subcooledheatpump
7 жыл бұрын
If you are certain that you have a 460 volt drive, then it likely will turn on at around 380 volts DC and overvoltage trip at around 800 volts DC. The DC bus capacitors in a VFD are usually in a series, or series parallel. So it's more than likely your actual safe voltage is around 800 volts DC. By the way, Electrolytic capacitors usually aren't rated higher than 500 volts DC, which makes it necessary to put them in series in ANY drive that is over 240 volts AC
@14jerseyboy56
7 жыл бұрын
That's good to know. The power supply I bought has a max red line voltage of 700vdc, so like you said the VFD should turn on after I reach 380volts, plus with a max voltage of 700vdc I should never be able to over voltage the drive. Thanks again!!
@camilesfernando7536
7 жыл бұрын
1.how can i run DANFOSS 2882 vlt (input 400v 3 Ph) with out control pannel (using 5K veriable resister wear to connect) 2.I doesnot have 3 Ph power then connect DC 650volt to vfd to run 3 Ph 3 HP motor?.
@14jerseyboy56
7 жыл бұрын
I have a Baldor H2 Vector drive, model VS1GV45-1B. It's a 460vac 3ph, 5hp. I am wondering how much DC volts I should put on the bus.
@subcooledheatpump
7 жыл бұрын
Usually the drive manual will tell you the limits for minimum and maximum bus voltage, but the short answer is about 650 volts DC
@14jerseyboy56
7 жыл бұрын
Thanks! I have 300 volts of battery power now, so I have to acquire another 300 or so. My Baldor has a B+, and B- terminals where the braking resistor terminals are located, so I assume that those are the tie in to the DC bus. Do you recommend that I build your precharge circuit? Thanks for your videos, and thanks for helping all of us DIY'ers achieve our goals!!
@subcooledheatpump
7 жыл бұрын
I looked at the user manual for the drive, It does look like B+ and B- are the bus connection. Yes I would use a precharge circuit in this case, just to be sure.
@14jerseyboy56
7 жыл бұрын
I just bought an AC to DC power supply on Ebay. It's a 0-600 vdc adjustable voltage supply. ($199.00) I figured that would be cheaper than getting 25 more 7ah, 12v SLA's, which go for $16.00/pcs. Now with a power supply, where I can dial up the voltage slowly, do you still recommend a precharge circuit?
@subcooledheatpump
7 жыл бұрын
It won't be as important now that you can adjust the voltage.
@chuksohacheni6384
3 жыл бұрын
How do get the boost converter
@shree010879
5 жыл бұрын
Thank you for the Video. I liked it. I came across this video tutorial because I ordered wrong model, my mistake. I wanted ABB ACS355 series but ordered ABB ACS550. This has inbuilt chopper. And do not have DC bus terminals. I had to open it to figure out the DC bus. I want to connect solar panel output on this DC bus. I connected drive to 3 phase supply and measured DC bus voltage. It is around 565 V. I am assuming that supplying DC 565V should be sufficient. I hope control logic is powered from this DC bus only. I have following options to connect DC power to Drive. 1) Connect +ve of the solar panel to Break resistor terminal (to the one which is connected to +ve of DC bus) and -V of solar panel to all three AC terminals. In this way only half of the rectifier diodes will be working. 2) Hookup Solar panel terminals to the internal DC bus. Do you have any suggestions? Do you think this will work?
@subcooledheatpump
5 жыл бұрын
I would try to connect the panels to the DC bus internally if possible
@ShaunDobbie
8 жыл бұрын
I plan to get a 3 phase compressor. I will take the DC directly out of a 24v inverter and feed it into the VFD.
@whirled_peas
3 жыл бұрын
Awesome - that's a big load. Did it work out? I plan to try and make a mobile electric bandsaw mill I'd love to know if you managed this.
@14jerseyboy56
7 жыл бұрын
Sorry! typo on my part! it is a 480vac drive not 460! My Bad!!
@mikekaranja6723
7 жыл бұрын
My name is Mike Karanja. I been watching ur VD on youtbe. Yeah and I been liking all most all of them Congratulations and keep it up. I requestin some of your help. Ok. I build IGBT controller Vdc 40 volts. It's working pafetly between forward n reward High speed it's working perfectly, while am controling speed with pmw, n when want to reward am using switch to off A to B. Here we come the 👉 point. When I load my IGBT control with a Highy voltage it's blowing my IGBT. I was requesting ur help, how can I build a diagram that can be able to handle a higher volt on IGBT control, thank you. Hopefully to you ur warm 🤗 response, thank you again. N I love i like your work. God Bless you more and more
@subcooledheatpump
7 жыл бұрын
Have you tried increasing the IGBT switching time? If they are turning off too quickly the turn off spike could be going above the IGBTs rating. You can slow them by increasing the gate resistor value
@mikekaranja6723
7 жыл бұрын
Thenx bro for ur quick response. Am highly appreciated. I tryed all that but what happened by the end of time once I try with a low voltage it's working cool. But once I plug Highy voltage I find myself in a dip stress of IGBT explication, even if I disconnected pmw. IGBT still exploding. Am in Qatar. N I wanted to make my own car control. And I want to use between 300v to 500vdc that is. Do you have any diagram or my request you send the the diagram I can use please I request. It's will be my pleasure. Here my email adress is it's will be ok with u to send me here thank you, Mickykarash@gmail.com
@mikekaranja6723
7 жыл бұрын
And I have another question. If I use the IGBT with the normal 3 face motor , will it work with IGBT?? Thank you so much Bro n God Bless you
@mikekaranja6723
7 жыл бұрын
How are you today bro. Hope you ar doing well. And did u got my previous message?
@achortg7107
6 жыл бұрын
Please I would want to know how you resolved this issue. What solution do you have eventually? Please I would appreciate if you share with me. Thanks
@danieltaon7462
8 жыл бұрын
me too me too i love IGBTs!!!!!! please make some high power bt`s tests plizzz!! man u should teach electronics on the highs power side! :))
@giftcp82
5 жыл бұрын
I am exploring EVs. can I run a 10hp motor with a VFD DC setup
@subcooledheatpump
5 жыл бұрын
As long as you have a VFD that can output 7.5 kW (10 HP) or more and it can be run from DC, yes. If it's for an EV I highly recommend getting a VFD with some form of torque control. An ABB ACS600 will do it, another example is a control techniques Commander SK
@giftcp82
5 жыл бұрын
@@subcooledheatpump Thanks for the prompt response. How about for something in the 5HP range
@giftcp82
5 жыл бұрын
@@subcooledheatpump Hey just a quick follow up to my question above. I have decided that I simply around 3 - 5hp for my design. what VFD with DC support could you recommend in that range. I have been searching the internet and it does not seem that many people are using the DC part in VFDs. The reason I am choosing this aproach is because the EV motor controllers are very expensive. However a VFD can do moreless the same thing
@giftcp82
5 жыл бұрын
btw, I am looking for a VFD that could cost between $100 - $200
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