Thanks for the tip!
Steven Fahey www.sparweb.ca > Date: Mon, 4 Mar 2013 00:51:22 -0800 > From: [email protected] > To: [email protected] > Subject: Re: [EVDL] Suitability of a converted BLDC motor to EV go-kart > > 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) > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130304/3e320335/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)
