Have you checked the motor forum at Motor Technology<http://endless-sphere.com/forums/viewforum.php?f=30&sid=836396356fd1badfcfca291cf57c28db>
On Sun, Mar 3, 2013 at 11:10 PM, Steven Fahey <[email protected]> wrote: > > Hi, > Glad I could join up. After a bit of searching in the archives, it looks > like the members here know how to match up motors with controllers. > Since I started thinking about building my own go-kart - really just an > off-road buggy for my son to scoot around with - I've been wondering if the > left-over motors from my previous projects would be suitable. > > I have what you could call a BLDC (brushless DC) motor in my garage, but > it comes from an unusual source: > I converted it from a 7.5HP induction motor, by turning the rotor down on > a lathe, and installing permanent magnets on it. I left the winding mostly > unchanged, save for extending all phase wires out separately. Why? I > meant it to be a 3-phase alternator for a wind turbine. In the end, I did > not use this one for the wind turbine project, I did a smaller motor > conversion, better suited to my needs and less heavy on the tower. For > anyone who wants to see details on that project, and inside my motor > conversions, look at this www dot sparweb dot ca. > > The motor in question is the converted Toshiba that I show on my projects > webpage. I did a number of run-up tests using a lathe to determine its > potential as a generator (which is good). Perhaps they are of some use in > determining its suitability as an EV drive motor. Of course, if the > original induction motor would have been better for an EV, the irony would > not be lost on me! I did not have an EV in mind at the time. Really my > only problem is having exceeded my practical limits with the size of wind > turbine that I can mate up with this generator, so I'm consindering other > uses. > > It would be most convenient if I could equip the go-kart with a set of > four 6-volt golf-cart batteries, so I can tie it into my existing off-grid > 24V battery bank. Since a go-kart is just for recreational use (and maybe > a farm runabout if I put a toolbox on the back) I'm not too concerned about > endurance. #1 goal is fun. #2 is to teach my kid some things. #3 is for > all the work on that motor not to go to waste. > > I spent some time looking at the datasheets and installation manuals for > Kelly motor controllers. Obviously they are written for installers using > "off-the-shelf" motors. The wiring looks straightforward enough, but I've > read in your archives that the harmonics are very important. I can't use > an induction motor VSD to do this kind of thing. There are controllers > specific to BLDC motors that I must use. At this time I don't have any > hall sensors built into my converted motor, but it could be done, if it's > needed. The original motor windings are rated for 240V/480V, but as I > said, I'd rather operate it from 24 Volt batteries, so that it can recharge > from wind & solar. Do these motor controllers "step-up" the DC from > battery source to a higher output voltage? > > The converted Toshiba BLDC motor weighs about 200 pounds. I expect the > battery bank will be at least another 200, one driver (no pax seat) > requires another 200 pounds, and I roughly estimate the welded steel > framework, driveline, and equipment to demand another 300 pounds. Roundly > estimating 1000 pounds machine when complete. A differential and disk > brakes will be necessary... I won't be winning any land speed records. > > So my questions are: > Am I starting off on the wrong foot with this motor? > Will a typical BLDC motor controller be able to drive this motor without > burning up? > Do the motor controllers require hall-sensors to work properly? > > If the odd features of this motor make it a bad candidate, then so be > it. > I'm still interested enough in making an EV go-kart, and getting my > hands on old induction motors is not hard. > > Thanks to anyone who can help. > > > Steven Fahey > > www.sparweb.ca > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130304/524756df/attachment.htm > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130304/da0ea145/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
