I am getting prepaid for building an EV Uno without transmission. The biggest motor and batary is no problem to buy.I want torque, ready to make a dragster without transmission but do i need transmission for above 100 km range?I also want to convert to 4x4. Which one is better:1-use 4x4 transmission?If which car‘s transmission?2-use 2 big motor one rear and one front and no transmission?3-use 4 small motors for each wheel?
The range of an electric vehicle can be unlimited. It all depends on the motor that is used to drive the vehicle. Many electric vehicles today use a DC Motor which can be controlled by varying the power to the motor. Zero volts results in zero speed while full power results in top speed. On the other hand, a magnet motor would probably run a top speed all the time and the speed of the vehicle would be controlled by a transmission. When the vehicle is parked, plug it up to power your home.
If you want torque, it's best to have yes transmission, rather than no transmission. Yes transmission means less range at fast speeds, more range if all you do is start and stop city driving. Of course the right motor eliminates the need for a transmission, but the right motor i.e. one with high torque at stall and high rpm is not available commercially to converters. You can take a standard commercially available DC motor, and gear it so that 75 mph is your top speed and still get pretty good off the line launches with a single reduction ratio. As to drive system, 4 wheel independent drive is superior and in an ideal world, that's what all cars would have. You can drive each half shaft shaft with a belt or a chain, or you can use hub motors. The hub motor selection is pretty poor right now, but in a few decades you should be seeing 50 kw hub motors that weigh 20 lbs each. If you're building a conversion yourself, and you want a high top speed, and fast off the line launches, you need more than a single reduction ratio. You should use a transmission, and if you want 4wd you can use the transfer case. I know that sounds awful because it sucks up all your power. You could drive the back axle through the transmission and the front one directly with a different motor. A DC motor can draw a huge number of amps for short periods to produce mountains of torque, but only for short periods and you risk damaging the motor every time you do that. But if it's a drag racer, and you expect to rebuild the motor after 3 quarters of a mile anyway maybe you can use no transmission, gear it for high speed and just draw huge amps to make your low speed torque at the wheels. It's just about what you prefer.
