according to this link, my 5th gear ratio is 0.815 and my differential ratio is 4.059.Strantor, are you sure about the RPM of your car at 75 MPH? That sounds kind of high for a cruising RPM. My 04 Grand Prix cruises at around 1800RPM at 65MPH. Heres a link to a RPM@MPH calculator; http://www.wallaceracing.com/gear-speed.php
If you've got one, I'll take it. Where do you get 'em ? how much do they cost?these little puppies will snap your neck...
http://www.drs.com/Products/PESG/PDF/PA450.pdf
holy crap that's a top drive motor! I used to be a top drive technician, but never saw one of thesethese little puppies will snap your neck...
http://www.drs.com/Products/PESG/PDF/PA450.pdf
I was commissioning tech for Tesco top drives (hydraulic/electric) for a number of years. These motors from DRS where initially military implementations but Tesco made them successfull as top drives. These motors are internally liquid cooled, as are the inverters, which made them very dense power units. We stacked 3 motors for 1350HP top drives. Although these units are large, it's this type of technology that I'm convinced will lead the way in automotive drives. With 14 pole pairs, torque is maxed throughout the speed range. Double or triple that, then emply pole skipping over the horsepower range and one can reduce transmission requirement to 2 or 3 speed. That's up for discussion though, as a properly matched transmission system will model the current/voltage requirements for automotive needs. The automotive application is seeing alot of experimentation on the motor end, but the transmission, however it evolves, is of equal importance.holy crap that's a top drive motor! I used to be a top drive technician, but never saw one of these
That is one heck of a PM, the weight to power is great, is it possible to over volt a PM or AC motor like the DC motors to increase power output? On a series DC motor you can double the rated voltage with out mods and with some mods you can go x3 or higher for short periods of time like 0 to 60mph.these little puppies will snap your neck...
http://www.drs.com/Products/PESG/PDF/PA450.pdf
700 Lb what are you going to build a tankSomething like this is probably where I would start;
I'm not so sure, you may be closer to this than I am, but when I visited the Allison transmission plant a couple of years ago where they make hybrid vehicles AC motor/ trans units the engineers were committed to 3 phase and I would be very interested in any leads anybody has that point otherwise.Although these units are large, it's this type of technology that I'm convinced will lead the way in automotive drives. With 14 pole pairs, torque is maxed throughout the speed range.
$20K. Inverters are another $15K.If you've got one, I'll take it. Where do you get 'em ? how much do they cost?
We ran these with 3 phase inverters. Many years ago I worked on diesel electric locomotives that were DC traction motors. I don't see a reason to deviate from the 3 phase approach, for a number of reasons. The biggest being the availablity of proven technology at production costs. We must recognize however, the contribution that the automotive industry has made in advances on many basic designs. With that in mind, I'm sure that the multi phase motor is poised for redesign to service a specific application.I'm not so sure, you may be closer to this than I am, but when I visited the Allison transmission plant a couple of years ago where they make hybrid vehicles AC motor/ trans units the engineers were committed to 3 phase and I would be very interested in any leads anybody has that point otherwise.
All the consumer EV's have only one finale drive gear that I know of because of the wide operating range of the motor, including the Extraterrestrial EV's.Do most modern electric cars even require a gearbox?
Thats what a number of peopke have said but personally I dont see how "decent/equal torque through the whole rpm range" equals "no need for a multispeed gearbox"Do most modern electric cars even require a gearbox? Power output is pretty good over all RPM ranges. The Nissan Leaf for example I believe has a single-reduction gearbox, with no user selectable gears. Reverse is handled by the AC inverter by swapping two phases, neutral disconnects phases and drive runs them normally forward. Plus there are re-gen modes which means the brakes are used far less often.