Your AC tractor sounds very interesting. Include my email on more detailed information. I have several EV's including a GE Elec Trak. I also have designed several different AC inverters for induction motors and BLDC motors but they all incorporated microcontrollers or DSP's I scanned a really good app note from Motorola describing an analog inverter (Lee Hart sent this, thanks). It was at http://www.evtech.org/ but I don't see any files there any more, what's up with that Jon? Thanks, Rod 1994 Dodge TEVan 1995 Club Car 1970 Elec Trak 2002 Currie Scooter hower.iwarp.com/photo.html
Jim Phillips wrote: > > Jim Coate wrote: > > >>Jim Phillips wrote: >> >>>(I was there with my AC powered tractor) >> >>OK, I'll bite... "AC powered tractor" as in a battery electric tractor >>with an AC motor/controller? If so, I'd love to know a little more about >>it, and/or see a picture (or link to a web site if you have it up >>anywhere). Thanks. > > > I'd love to talk about it! You're correct on all accounts. I > have talked a little bit about it here, but I'm a terrible typist > and it is slow going. > > The motor is a standard 2 hp, 220/440 volt AC induction motor. > The motor rewinder found it in his junk box because a bearing > failed and the motor burned up. I had him rewind it with 1/10 > the number of turns (cost $250). That made it 22/44 volt motor. > It is used in the 44 volt configuration. > > The controller is variable frequency/ variable voltage PWM. Max > frequency is about 150 Hz. Battery voltage is 48 volts (yes, a > bit high for the application) The controller is simple slip > control, not vector or anything and no processor. I use some 100 > amp 70 volt FETs as the drive. > > I am very happy with the performance. The control is very smooth > and easy to operate. I can spin the tires in high gear on dry > pavement and it will go about as fast as is safe. Haven't gotten > the mower finished so I mostly use it to tow cars :-) > > There is a lot to say about it (too much for an email), I > purposely did things that no one else has done, just to be > different. I am working on my web site (also send it to the > album) should be ready in a week or two. > > Jim Phillips > >
