This channel is all about my builds in the past and today. I, my wife and our two boys, we live in a small community of Liminka in Finland (northern Europe).
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...
Thanks. Once it was finished I took it to a local innovations event (or maker faire) to hear peoples thoughts on it. Someone would have liked to develop it further for football fields maintenance and also there were some ideas about using it as a carrier for foresting equipment but I was not really interested in commercializing. I made plans for an improved (and simplified and lighter and with better steering capabilities) though but never got as far as building the second version. I felt like, I’ve done it once, I dont’t want to repeat myself. So actually this particular one is now dismantled and parts are waiting for next suitable inspiration.
Thanks. After my sons it went for a second career for my brothers children and it was a joy for many drivers for many years. Needed couple re-builds though but all good anyway 🙂
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.
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 .
I used two 12V AGM batteries in series. I was not happy with the amperage output of them though. Go with something more modern evennif they are more expensive.
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.
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.
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??
@@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?
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.
Nope. For me a big part of the joy of making things is to just to build, look and modify as long as needed. I don’t want to be too ”professional” on these things, you know :-)
Hello Sir Well Done Sir We are final year mechanical engineering student now we are making electric tractor as final year project we are dealing with BLDC Motor 750 Watt 48V Is it work on it????? operation we perform ploughing
I would think it will probably be little on weak side but of course it also a matter of gearing. Slow speed gives more usable power for such heavy purpose. The motor I've used can produce up to 4,5kW but with my gearing I don't think even it would be much of use in ploughing.
@@eE48v Thanks for response Actually we are using 750 Watt BLDC motor having 2800 rpm without any gear & with gear it will give 450 rpm. Now we are making mini electric tractor . Which battery u used in ur model???
Hello, it was kinda cool to see that the idea I recently came up with would work. Only difference I could see between my idea and yours is I'll be using an old electric wheel chair as a power plant. And I'm hoping to make it fully independent suspension. Did you even see how much weight yours could handle?
