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- เผยแพร่เมื่อ 31 พ.ค. 2015
- In this video I am replacing my chinese lathe's DC motor and electronics with an AC motor and an inverter drive for it. The old one was supposed to have something like 1hp (which I do not belive was ever the case). New setup produces 2hp so the improvement should be quite significant.
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Great job ! Looks very professionally put together!
Nice work Bud! Looks nice and clean!
very nice video,and well explained.. enjoyed it.
now u have a lathe, great project. AC motor.
Good job! Stay healthy .
Top de mais meu amigo. Muito show 👏🏻👏🏻👏🏻👏🏻👏🏻
Terve! I am doing similar conversion, but would want to use a servo-stepper nema24 as drive, would you recommend to stick to ac motor with VFD? what is the power of your motor .75kW or 1.5kW?
nice rebuid.
Question what is the belt drive size on motor and spindle. Also what rpm do you get on the spindle using with the VDF (min freq en max freq)
Thanks
Thanks for Sharing. I also want to convert my multiple pulley lathe using a AC motor and inverter.
I am amazed to find this, insamuch as I have been going NUTS trying to find the details on converting my old wood lathe, which has a single phase AC motor, that I have tried three of the oh, yeah, this works on anything crap, to a DC Chinese motor (one of the big blue ones) that they DO make speed controllers for.
...and I find this guy doing just the opposite...
Personally I have been really pleased with this three phased motor setup. It is a 1.5kW motor. What the VFD does is first converts the input AC (in my case single phase 220V) into DC and then internally that DC into three phased AC (400V). There are simular controllers which take three phase AC in as well (400V).
Compared to the original setup this is superb. The torque on low speed is good and there is enough rpm for small diameters as well. The only issue is that with this motor I start noticing that the frame is not very sturdy so I cannot even use the full power of the motor setup. But that is something I have no problem living with.
And I'm sorry I did not realize the first question earlier. I hope the answer clarifies and it is not too late - propably is..
Hi, I get vibrations on the motor at some frequencies. Is it normal ?
Sorry friend, but did you got it to invert the rotation as well?
@@alexeinuville2555 You mean switch direction of rotation? Yes, that is part of the magic the controller provides by default. The one I have is truly flexible but I would assume that feature is available in most vfd’s.
@@eE48v thank you very much!!!
good video
Parabéns amigo
Kiitoksia tuosta kirrosluvunnäytön kytkentäohjeesta. Itsellä Bernardo 550wqv ja siinä näytti olevan samat sisuskalut. Mulle tuli Invertek optidrive valmiina pakettina ja 1.1kw motti.
According to your video it seems that you have connected the motor in star configuration. Normally it should be delta connection. Have you tried Delta?
Nice. Please tell me which size pulleys you use? I have smaller 240 version of this lathe. I want to fit a 1.5kw 6 pole, 940rpm motor, I think it will be easier to get good speeds. 1:1 or 2:1. The motor is tooo long, 100L frame, so it will go through chip tray. 1.1kw will be shorter. What do you think best? Thanks
Mark E , Unfortunately I don’t remember what I ended up with but I did calculate it to match roughly the original ratio. It worked out good and I get about same top rpm as with the original. I also had to cut away and box about 5cm dent to the chip tray. Does not matter though as it is still well away of the chuck surface. Motorwise I think both will do fine as the next issue of frame starting to flex/vibrate before running out of power, will be there, with either.
what is really nice, other than the chinese lathe, is the tachometer, on spindle speed. with a normal vfo, if you get rpm, it is motor rpm, which does not equate to anything on the lathe, without a chart. You can build a large chart, then read out the vfo I suppose. good job.
On most VFDs there is a parameter that you can change to select what is displayed. Usually there is an option "line speed" or "shaft speed" and another parameter to set a multiplier. This way if you have just one gear ratio from motor to spindle, you get the actual RPM displayed on the VFD.
Very good job, thank you ! I am doing the same tranformation on Bernardo profi 700.
Just a couple of question: how did you connect the e-card to the vfd to start simultaneously with the motor ?
And what about the switch off when you open the protection cover ?
Thanks in advance for your help.
Greetings from Italy
Silvano
I simply have an external master power switch for the entity. Vfd and ecard are both powered from the same master switch but they are parallel and independed as such.
For safety I’m using the original protection cover switch but it is now connected to one of the low voltage circuits of the vfd. Vfd is configured to stop when that circuit breaks.
Thank you very much for the fast replay ! Very kind of you.
I wonder whether it is possible to connect the power of dfd
...inverter directly to L N out of the e-card. Originally the speed controller and the motor is connected to the card.
Hello, I see the motor you put is a 3phase 50Hz motor. Have you tried with an ER20 2.2kW motor? Did anybody else tried this?
Belle modification concernant la motorisation , cependant je me pose une question sur le couplage , telle que vous présentez le boitier de connexion , le couplage est en étoile , alors que le réseau semble t'il est en 230 v mono ,donc phase + neutre le couplage devrait être en triangle , pour avoir du 230 tri ,sur le variateur de fréquence pour votre moteur , un mauvais couplage risque de griller les enroulements , quelqu'un a t'il une réponse ou une explication .
If a single-phase VFD is used, the 3-phase motor must be connected to the delta to have its nominal power. Because the VFD output is only 3x230V max.
Yes, just like it was done in this video.
very interesting and great work!! Couldn't you have mounted the inverter directly on the lathe to have the controls close at hand?
Thank you. I actually changed it later so that I attached a plywood board behind the splash guard and inverter is now same package with the rest of the lathe. Roughly in the same location though. It is actually quite handy to have the speed nob on the right away from the spinning parts. I also still have the standard safety switches hooked into the spindle guard so it is no less safe either.
I would use a VFD and 3 phase 2hp motor
what is the spindle hole size and what is that lathe called and what do they costs
Spindle hole size is 38mm. This is almost the exact same model (only newer): koneita.com/metallisorvit/metallisorvi_nova_290VFx700G.htm. I believe the same is sold in many names.
thanks so much
Emergency stop?
Hey i have a mini lathe and i want to convert to an AC motor!! How can i make it run both directions left and right for thread cutting?? Is that possible??
In my setup the controller has capability to run both direction. I guess it is up to what components you decide to use.
@@eE48v So the lathe is cutting threads and has auto feed screw just like before?? there is no compromises on thread cutting?
@@ThanasisThomas No change there. Everything from the motor onward is the same.
@@eE48v thanks for the reply has beeing very helpful
@@eE48v i will convert mine too thanks for the help!Also last question i have only single phase motor capacity is there vfds for single phase motors to make the conversion?
Looks like the upgrade costs more than the original lathe.
Как установить карпку передачу на такарне станок из масквеча
Your inverter doesn't produce 400 volts on each of its three output legs or phases. Each phase developed 240 volts relative to neutral or earth ( zero). The 400 volt potential is a transient value between any two phases as the out of scyn wave forms interact. The 400 volt is actually an RMS value of about 415 volts if the output legs (or phases) are balanced. The true behaviour of this supply system is clouded or masked as American consumers try to explain to each other how come they have "two phase" power in their homes. They confuse a LEG with a PHASE .
To really explain the system you need to start at the power lines in the street and not at the domestic service pole.
Stavros
Yep. You are right. I have not actually measured the delta between the phases going to the motor nor am I an expert on how inverters actually work. I have been assuming that even if the inverter only takes 240V in, it can do a 120 degree phase shift for phases using roughly that maximum voltage (when messured against ground) and thus achieve a maximum voltage difference of 400V between two phases (one phase being on positive side and the other on negative side).
Had to check still. This is the exact VFD I’m using: inverterdrive.com/group/AC-Inverter-Drives-230V/ABB-ACS150-01E-07A5-2/. If I understand the spec correctly it does indeed produce 3x230V maximum voltage and thus also the maximum voltage delta between phases is that 400V.
Insufficient lighting to see clearly what you're doing...